CN109574523B - Lime kiln for directly burning high-temperature coal gas of gasification furnace in hot feeding manner - Google Patents
Lime kiln for directly burning high-temperature coal gas of gasification furnace in hot feeding manner Download PDFInfo
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- CN109574523B CN109574523B CN201811594544.XA CN201811594544A CN109574523B CN 109574523 B CN109574523 B CN 109574523B CN 201811594544 A CN201811594544 A CN 201811594544A CN 109574523 B CN109574523 B CN 109574523B
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- 235000008733 Citrus aurantifolia Nutrition 0.000 title claims abstract description 70
- 235000011941 Tilia x europaea Nutrition 0.000 title claims abstract description 70
- 239000004571 lime Substances 0.000 title claims abstract description 70
- 238000002309 gasification Methods 0.000 title claims abstract description 37
- 239000003034 coal gas Substances 0.000 title claims abstract description 26
- 239000000446 fuel Substances 0.000 claims abstract description 34
- 239000007789 gas Substances 0.000 claims description 203
- 238000002485 combustion reaction Methods 0.000 claims description 78
- 239000003245 coal Substances 0.000 claims description 19
- 239000000779 smoke Substances 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 9
- 238000010992 reflux Methods 0.000 claims description 7
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 6
- 238000009413 insulation Methods 0.000 claims description 6
- 238000004321 preservation Methods 0.000 claims description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 239000010881 fly ash Substances 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 239000000110 cooling liquid Substances 0.000 claims description 2
- 238000001354 calcination Methods 0.000 abstract description 11
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 33
- 238000000034 method Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 8
- 239000002912 waste gas Substances 0.000 description 8
- 239000002956 ash Substances 0.000 description 5
- 239000000428 dust Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000087 stabilizing effect Effects 0.000 description 4
- 229910001873 dinitrogen Inorganic materials 0.000 description 3
- 239000005997 Calcium carbide Substances 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000004449 solid propellant Substances 0.000 description 2
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2/00—Lime, magnesia or dolomite
- C04B2/10—Preheating, burning calcining or cooling
- C04B2/12—Preheating, burning calcining or cooling in shaft or vertical furnaces
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Muffle Furnaces And Rotary Kilns (AREA)
Abstract
The invention relates to a lime kiln for directly burning high-temperature coal gas of a gasification furnace, which comprises the gasification furnace, the lime kiln and a high-temperature coal gas bypass pipeline, wherein the gasification furnace is provided with a coal gas outlet pipe, and the lime kiln is provided with a burner. The lime kiln is a sleeve kiln, a beam lime kiln, a double-hearth kiln and a rotary kiln, and the burner is a burner and/or an inserted burner. The gas outlet pipe of the gasifier is connected with the fuel inlet pipe of the burner through a high-temperature gas pipe, the high-temperature gas pipe is provided with a high-temperature gas bypass pipe, and the high-temperature gas bypass pipe is used for dredging high-temperature gas generated by the gasifier through the high-temperature gas bypass pipe under the emergency stop state of the kiln so as to prevent pressure holding. The invention optimizes the feeding form of the gas fuel, fully utilizes the sensible heat carried by the high-temperature gas, improves the thermal efficiency and the calcination efficiency of the lime kiln, and is beneficial to saving energy, reducing emission and reducing the energy consumption and the cost of lime production.
Description
Technical Field
The invention belongs to the technical field of chemical industry and building material production, relates to calcination equipment, and in particular relates to a lime kiln for directly burning high-temperature coal gas of a gasification furnace in a hot feeding manner.
Background
The steel industry, the calcium carbide industry, the alumina industry and the refractory material technology are all high-speed development industries, and lime is used as raw material or auxiliary material in all the industries. The lime kiln is large calcination equipment for producing lime, and the modern new technology lime kiln has the characteristics of environmental protection, energy saving, high mechanization and automation degree, and not only can protect the environment, but also has good quality and low cost of the produced lime. Lime kilns are classified into gas kilns, solid fuel kilns and mixed kilns according to fuel, wherein the gas fuel comprises blast furnace gas, coke oven gas, calcium carbide tail gas, producer gas and natural gas, and the solid fuel comprises coke, coke powder and coal. The kiln type kiln comprises a vertical kiln, a rotary kiln, a sleeve kiln, a double-hearth kiln, a French kiln (beam type lime kiln) and an annular opposite firing kiln. Meanwhile, the kiln has a positive pressure operation kiln and a negative pressure operation kiln.
The gas-fired lime kiln is a lime kiln for calcining lime by utilizing tail gas with a certain heat value. The gas-burning kiln has the advantages of full combustion, good calcination effect, easy operation, good quality of produced lime, clean and environment-friendly production environment and the like, and is favored by most enterprises in the industry. The method is a large country of coal, has abundant coal reserves, converts coal into gas fuel through a coal gasification process, is used for calcining lime fuel, can improve the quality of lime products, optimize the production operation of lime kilns, reduce pollutant emission and improve the atmospheric environment. The high-temperature gas generated by the gasification furnace in the prior art is sent into the lime kiln to be used as fuel after being processed by processes such as cooling and the like, so that not only is the sensible heat carried by the gas lost, but also the investment and the operation cost of cooling equipment and the like are increased in the processing processes such as gas cooling and the like.
Disclosure of Invention
The invention aims to provide a lime kiln for directly burning high-temperature coal gas of a gasification furnace by hot feeding, optimize the feeding form of gas fuel, fully utilize sensible heat carried by the high-temperature coal gas, improve the thermal efficiency and calcination efficiency of the lime kiln, save energy and reduce emission, and reduce the energy consumption and cost of lime production.
The technical scheme of the invention is as follows: the lime kiln comprises a gasification furnace, a lime kiln and a high-temperature gas bypass pipeline, wherein the gasification furnace is provided with a gas outlet pipe, and the lime kiln is provided with a burner. The gas outlet pipe of the gasifier is connected with the fuel inlet pipe of the burner through a high-temperature gas pipe, one path of the high-temperature gas pipe is connected with a high-temperature gas bypass pipe, and the high-temperature gas bypass pipe is used for dredging high-temperature gas generated by the gasifier through the high-temperature gas bypass pipe under the emergency stop state of the kiln so as to prevent pressure holding.
Lime kilns are sleeve kilns, beam lime kilns, double-hearth kilns and rotary kilns, and other kiln types are also within the scope of the invention. The burner is a burner and/or an insert burner, and other types of burners are also within the scope of the present invention.
The sleeve kiln is provided with an upper combustion chamber and a lower combustion chamber, and the upper combustion chamber and the lower combustion chamber are respectively provided with a burner. The burner is provided with a combustion-supporting air inlet pipeline and a fuel inlet pipeline, the combustion-supporting air inlet pipeline is connected with the combustion-supporting air pipeline or a blower, and a gas outlet pipe of the gasifier is connected to the fuel inlet pipelines of the upper combustion chamber burner and the lower combustion chamber burner through a high-temperature gas pipeline. The sleeve kiln is provided with an upper inner sleeve, a lower inner sleeve, an ejector and a circulating smoke outlet, wherein the circulating smoke outlet is positioned at the upper parts of the upper combustion chamber and the lower combustion chamber. The upper inner sleeve is connected to the waste gas emission system through a smoke outlet pipe, the lower inner sleeve is connected to an injection gas inlet of the injector through a circulating smoke outlet, a driving gas inlet of the injector is connected with a driving air pipe, and an outlet of the injector is connected with the upper combustion chamber and/or the lower combustion chamber.
The beam lime kiln is provided with an upper combustion beam, a lower combustion beam and a gas distributor, wherein the upper combustion beam and the lower combustion beam are respectively provided with a burner, the burner is provided with a combustion air inlet pipeline and a fuel inlet pipeline, and the combustion air inlet pipeline is connected with a combustion air pipeline or a blower. The gas outlet pipe of the gasifier is connected to gas distributors on both sides of the beam lime kiln by high temperature gas pipes, which are connected to fuel inlet pipes of the upper combustion Liang Shaozui and the lower combustion Liang Shaozui. The double-hearth kiln comprises two kiln hearths, wherein the two kiln hearths are respectively provided with an inserted burner, a gas distributor and a combustion-supporting air inlet, and the combustion-supporting air inlet is connected with a combustion-supporting air pipeline. The gas outlet pipe of the gasifier is connected to the gas distributors of the two kiln bores through a high-temperature gas pipeline and a high-temperature three-way reversing valve, and the gas distributors are connected to the fuel inlet pipeline of the plug-in burner. The double-hearth kiln is provided with a gas pressure-stabilizing reflux device which is connected in parallel on a high-temperature gas pipeline. The inserted burner is of a sleeve type structure with a cooling layer, and cooling air or cooling liquid is arranged in the cooling layer. The burner of the rotary kiln is provided with a combustion air inlet pipeline and a fuel inlet pipeline, the fuel inlet pipeline is connected to a gas outlet pipe of the gasifier through a high-temperature gas pipeline, and the combustion air inlet pipeline is connected with a combustion air pipeline or a blower.
The combustion-supporting air of the combustion-supporting air inlet pipeline is oxygen-enriched, pure oxygen or air.
The temperature of the gas in a high-temperature gas pipeline between the gasification furnace and the burner is 600-2200 ℃, and a fly ash removing device is arranged on the high-temperature gas pipeline; the high-temperature gas pipeline is provided with an inner heat preservation layer, an outer heat preservation layer or a heat insulation layer; the fuel in the gasification furnace is carbon-containing substances of pulverized coal, lump coal, crude oil and biomass, the gasification furnace is of a shell structure with a slag tapping function, or is of other structural forms capable of realizing combustion of the carbon-containing substances and combustion-supporting gas of oxygen enrichment, pure oxygen or air to generate gas mixture mainly containing carbon monoxide.
Compared with the prior art, the inventionThe lime kiln directly burning the high-temperature coal gas of the open gasification furnace has the beneficial effects that: the method comprises the steps of optimizing the feeding form of gas fuel, directly feeding 600-2200 ℃ high-temperature gas generated by a gasification furnace into a lime kiln for combustion by heat, fully utilizing sensible heat carried by the high-temperature gas, reducing 26-46 kg of standard coal consumption by ton ash, and reducing the calorific value of the gas by 1200-1400Kcal/Nm 3 Each standard is equivalent to 320-420 Kcal/Nm 3 Improves the heat efficiency and calcination efficiency of the lime kiln, and reduces the energy consumption and cost of lime production. The reducing atmosphere in the gasifier is operated without generating nitrogen oxides, so that the technical problem that the emission of nitrogen oxides in the waste gas of the coal-fired lime exceeds the standard is solved, energy conservation and emission reduction are facilitated, and the atmospheric environment is protected. Gas distribution of the high-temperature pipeline can be regulated through the high-temperature reversing valve, the high-temperature distribution device and the length or the pipe diameter of the pipeline to distribute and flow of the gas.
Drawings
FIG. 1 is a schematic diagram of a device for directly burning and calcining limestone by hot feeding of high-temperature coal gas in a gasifier according to the invention;
FIG. 2 is a schematic diagram of another embodiment of the present invention;
FIG. 3 is a front view of the combustion beam of FIG. 2;
FIG. 4 is a bottom view of FIG. 3;
FIG. 5 is a view in the A direction of FIG. 3;
FIG. 6 is a schematic diagram of a third embodiment of the present invention;
FIG. 7 is a schematic view of the plug-in burner of FIG. 6;
fig. 8 is a schematic diagram of a fourth embodiment of the present invention.
Wherein: 1-upper inner sleeve, 2-sleeve kiln, 3-lower inner sleeve, 4-gas outlet pipe, 5-burner, 6-upper combustion chamber, 7-injector, 8-gasifier, 9-lower combustion chamber, 10-flue gas outlet pipe, 11-beam lime kiln, 12-upper combustion beam, 13-lower combustion beam, 14-high temperature gas pipeline, 15-plug-in burner, 16-gas distributor, 17-high temperature gas bypass pipeline, 18-double-chamber kiln, 19-gas stabilized pressure reflux device, 20-high temperature three-way reversing valve, 21-rotary kiln, 22-combustion air inlet and 23-circulating flue gas outlet.
Detailed Description
The present invention will be described in detail with reference to examples and drawings. The scope of the invention is not limited to the examples, and any modifications within the scope of the claims are within the scope of the invention.
Example 1
The lime kiln for directly burning high-temperature coal gas of the gasification furnace of the invention is shown in figure 1, and comprises a gasification furnace 8, a sleeve kiln 2 and a high-temperature coal gas bypass pipeline 17, wherein the gasification furnace is provided with a coal gas outlet pipe 4. The sleeve kiln 2 is provided with an upper combustion chamber 3, a lower combustion chamber 9, an upper inner sleeve 1, a lower inner sleeve 3, an ejector 7 and a circulating smoke outlet 23, wherein the circulating smoke outlet 23 is positioned at the upper parts of the upper combustion chamber 6 and the lower combustion chamber 9. The upper combustion chamber and the lower combustion chamber are respectively provided with a burner 5, and the ejector is provided with an ejection gas inlet, a driving gas inlet and an ejection air outlet. The burner is provided with a combustion-supporting air inlet pipeline and a fuel inlet pipeline, and the combustion-supporting air inlet pipeline is connected with the combustion-supporting air pipeline. The gas outlet pipe 4 of the gasifier is connected with the fuel inlet pipe of the burner through a high temperature gas pipe 14. One path of the high-temperature gas pipeline 14 is connected with a high-temperature gas bypass pipeline 17. The high-temperature gas bypass pipeline is used for dredging high-temperature gas generated by the gasifier through the high-temperature gas bypass pipeline under the emergency stop state of the kiln, so as to prevent pressure holding. The upper inner sleeve 1 is connected to an exhaust emission system through a smoke outlet pipe 10, the lower inner sleeve 3 is connected to an injection gas inlet of the ejector through a circulating smoke outlet, a driving gas inlet of the ejector 7 is connected with a driving air pipeline, and an injection air outlet of the ejector 7 is connected with an upper combustion chamber and/or a lower combustion chamber.
In the embodiment, the gasifier is of a shell structure with a slag tapping function, fuel in the gasifier is pulverized coal or lump coal, and the pulverized coal is combusted with combustion-supporting gas of oxygen enrichment, pure oxygen or air to generate gas mixture mainly containing carbon monoxide, so that high-temperature coal gas is formed.
The temperature of the gas in the high temperature gas line is usually 600-2200 ℃, and in order to ensure the smoothness of the high temperature gas line 14, a fly ash removing device such as a settling tube and electric dust removing device is allowed to be arranged. High-temperature gas pipeThe road 14 is provided with an inner insulation layer, an outer insulation layer or an inner and outer insulation layer or a thermal insulation layer. The operation process of the sleeve kiln directly burning high-temperature coal gas of the gasification furnace comprises the following steps: 1200 ℃ and heat value 1400Kcal/Nm from gasification furnace 3 The high-temperature gas enters a high-temperature gas pipeline 14, a high-temperature gas bypass pipeline 17 is arranged on the pipeline, and the high-temperature gas generated by the gasifier is dredged through the high-temperature gas bypass pipeline in the emergency stop state of the kiln. The gas is conveyed to the upper combustion chamber burner and the lower combustion chamber burner of the sleeve lime kiln through pipelines, and the gas consumption of the upper combustion chamber burner and the lower combustion chamber burner is different and distributed according to the size of a conveying pipeline, the pipeline of the lower combustion chamber burner is thick, the pipeline of the upper combustion chamber burner is thin, and the gas is effectively distributed, so that the gas consumption of the upper combustion chamber burner reaches the distribution of the gas of the sleeve lime kiln. The high-temperature gas burns with the combustion air in the upper and lower combustion chambers through the upper and lower combustion chamber burners and then calcines lime. Because the gas generated by the gasification furnace is high-temperature gas, the heat carried by the gas enters the lime kiln, thereby improving the heat value of the gas, improving the heat value of the gas per standard prescription by 410 Kcal/Nm 3 The consumption of coal gas is reduced, and the consumption of standard coal is reduced by 31 kg per ton of ash. Because the gasification furnace is used for producing the reducing atmosphere, the produced gas is low-nitrogen gas, a large amount of nitrogen oxides can not be produced when the gas is burnt, the technical problem that the emission of nitrogen oxides in the waste gas of the coal-fired lime kiln exceeds the standard is solved, the national emission requirements on the nitrogen oxides and dust are met, and the huge investment and the operation cost of the conventional denitration of the waste gas of the lime kiln are reduced.
Example 2
Another embodiment of the invention is shown in fig. 2-5, and comprises a gasification furnace 8, a beam lime kiln 11 and a high-temperature gas bypass pipeline 17, wherein the beam lime kiln is provided with an upper combustion beam 12, a lower combustion beam 13 and a gas distributor 16, as shown in fig. 3-5, the upper combustion beam and the lower combustion beam are respectively provided with a burner, and the burner is provided with a combustion air inlet pipeline and a fuel inlet pipeline. The combustion-supporting air inlet pipeline is connected with a combustion-supporting air pipeline or a blower. The gas outlet pipe 4 of the gasifier 8 is connected to gas distributors 16 on both sides of the beam lime kiln by means of high temperature gas lines 14, which gas distributors are connected to the fuel inlet lines of the burners of the upper burner beam 12 and the burners of the lower burner beam 13. One path of the high-temperature gas pipeline 14 is connected with a high-temperature gas bypass pipeline 17. The high-temperature gas bypass pipeline is used for dredging high-temperature gas generated by the gasifier through the high-temperature gas bypass pipeline under the emergency stop state of the kiln, so as to prevent pressure holding.
In the embodiment, the fuel in the gasification furnace is lump coal, and the fire coal and pure oxygen are combusted to generate gas mixture gas mainly comprising carbon monoxide, so as to form high-temperature coal gas. In order to ensure the smoothness of the high temperature gas line 14, a fly ash removing device including a settling tube, electric dust removal, etc. is allowed to be provided.
The operation process of the beam kiln directly burning the high-temperature coal gas of the gasification furnace comprises the following steps: 1200 ℃ and heat value of 1100 Kcal/Nm from gasification furnace 3 The high-temperature gas enters a high-temperature gas pipeline, a high-temperature gas bypass pipeline is arranged on the pipeline, and the high-temperature gas generated by the gasifier is dredged through the high-temperature gas bypass pipeline in the emergency stop state of the kiln. The high-temperature gas is connected to the combustion beam through the high-temperature gas distributor 16, and the lime is calcined by mixing and burning the gas which is distributed through the high-temperature gas distributor 16 and combustion-supporting air connected to the combustion beam in the kiln. Because the gasifier gas is high temperature gas, the heat carried by the gasifier gas enters the lime kiln, the heat value of the gas is improved, the heat value of the gas per standard formula is improved, and the heat value of the gas per standard formula is improved by 410 Kcal/Nm 3 The consumption of coal gas is reduced, and 39 kg of standard coal is consumed by ton of ash. Because the gasifier is operated in a reducing atmosphere, the generated gas is low-nitrogen gas, a large amount of nitrogen oxides can not be generated when the low-nitrogen gas is combusted, the technical problem that the emission of nitrogen oxides in the coal-fired waste gas exceeds the standard is solved, the national emission requirements on the nitrogen oxides and dust are met, and the huge investment and the operation cost of the conventional lime kiln waste gas denitration are reduced.
Example 3
A third embodiment of the invention is shown in figures 6-7 and comprises a gasifier 8, a double-hearth kiln 18, a gas pressure stabilizing reflux 19 and a high-temperature gas bypass pipeline 17. The double-hearth kiln 18 comprises two kiln hearths, wherein the two kiln hearths are respectively provided with an inserted burner 15, a gas distributor 16 and a combustion-supporting air inlet 22, and the combustion-supporting air inlet is connected with a combustion-supporting air pipeline. The gas outlet pipe 4 of the gasifier 8 is connected via a high temperature gas line 14 to a gas distributor 16 of the two kiln bores, which is connected to the fuel inlet line of the plug-in burner. The gas pressure stabilizing reflux device is arranged on the high-temperature gas pipeline 14 in parallel, and the high-temperature gas bypass pipeline is used for dredging the high-temperature gas generated by the gasifier through the high-temperature gas bypass pipeline under the emergency stop state of the kiln, so as to prevent the pressure from being choked.
In order to ensure the smoothness of the high temperature gas line 14, a fly ash removing device including a settling tube, electric dust removal, etc. is allowed to be provided.
The operation process of the double-hearth kiln directly burning the high-temperature coal gas of the gasification furnace comprises the following steps: 1100 ℃ and heat value 1400Kcal/Nm from gasification furnace 3 The high temperature gas of (2) enters the high temperature gas pipeline 14. The pipeline is provided with a high-temperature gas bypass pipeline 17, and the high-temperature gas generated by the gasification furnace is led through a bypass under the emergency stop state of the kiln. The gas is conveyed to a high-temperature three-way reversing valve through a pipeline, is firstly led to a No. 1 kiln chamber, a high-temperature gas distributor 16 is arranged on the pipeline, and after the gas is distributed through the high-temperature gas distributor 16, the gas enters 33 inserted burners 15 of the double-chamber kiln, as shown in fig. 7, the burners are sleeve burners, primary combustion-supporting air passes through an outer pipe, and the high-temperature gas passes through an inner pipe to protect the burners 15; the high-temperature gas enters the kiln chamber 1 through the inserted burner 15, and is mixed with primary combustion-supporting air and combustion-supporting air passing through a preheating zone from the kiln top and burned to calcine lime. After the calcination of the No. 1 kiln chamber is finished (about 10 minutes), a high Wen Huanxiang valve is closed, and the gas is stabilized by a gas stabilizing and backflow device, so that the pressure change of a pipeline in the reversing process is prevented from being too frequent and the pressure difference is prevented from fluctuating. After 1 minute, the high-temperature three-way reversing valve is opened to the No. 2 kiln chamber, the gas is distributed through the high-temperature gas distributor 16, then enters 33 plug-in burners 15 of the double-chamber kiln, and the high-temperature gas enters the No. 2 kiln chamber through the plug-in burners 15 and is combusted after being mixed with combustion air to calcine lime. After the calcination of the kiln chamber No. 2 (about 10 minutes), the valve Wen Huanxiang is closed, the gas is stabilized by the gas pressure stabilizing reflux device, after 1 minute, the high-temperature three-way reversing valve is opened to the kiln chamber No. 1, and the above circulation is repeated to calcine the lime in the kiln. Because the gasifier gas is high temperature gas, the heat carried by the gasifier gasEnters the lime kiln together, improves the heat value of the gas, ensures that the heat value of the gas per standard formula is improved by 380 Kcal/Nm 3 The consumption of coal gas is reduced, and the consumption of standard coal is reduced by 26 kg per ton of ash. Because the gasifier is operated in a reducing atmosphere, the content of the nitrogen oxides in the generated gas is extremely low, and the burnt waste gas does not generate a large amount of nitrogen oxides, so that the technical problem of exceeding the emission of nitrogen oxides in the waste gas of the coal-fired lime kiln is solved.
Example 4
A fourth embodiment of the invention is shown in fig. 8 and comprises a gasifier 8, a rotary kiln 21 and a high temperature gas bypass line 17. The rotary kiln comprises a kiln head and a kiln tail, wherein the kiln head is provided with a burner 5, and the burner is provided with a combustion-supporting air inlet pipeline and a fuel inlet pipeline. The combustion-supporting air inlet pipeline is connected with a combustion-supporting air pipeline or a blower, the fuel inlet pipeline is connected to the gas outlet pipe 4 of the gasifier 8 through a high-temperature gas pipeline 14, and the high-temperature gas bypass pipeline is used for dredging high-temperature gas generated by the gasifier through the high-temperature gas bypass pipeline in the emergency stop state of the kiln.
The operation process of the rotary kiln for directly burning the high-temperature coal gas of the gasification furnace comprises the following steps: the 1100 ℃ high-temperature gas with the heat value of 1100 Kcal/Nm3 which comes out of the gasification furnace enters a high-temperature gas pipeline, a high-temperature gas bypass pipeline is arranged on the pipeline, and the high-temperature gas generated by the gasification furnace is dredged through the high-temperature gas bypass pipeline in the emergency stop state of the kiln. The gas is conveyed to a burner of the rotary kiln through a pipeline, and the yield of the rotary kiln is adjusted through the yield adjustment of the gasification furnace. Because the gasifier gas is high temperature gas, the heat carried by the gasifier gas enters the lime kiln, the heat value of the gas is improved, the heat value of the gas per standard formula is improved, and the heat value of the gas per standard formula is improved by 410 Kcal/Nm 3 The consumption of coal gas is reduced, and the consumption of standard coal is reduced by 43 kg per ton of ash.
Claims (4)
1. The utility model provides a gasifier high temperature coal gas heat send lime kiln of direct combustion, includes gasifier (8), lime kiln and high temperature coal gas bypass line (17), gasifier (8) are equipped with coal gas outlet pipe (4), the lime kiln is equipped with combustor, characterized by: the gas outlet pipe (4) of the gasifier (8) is connected with the fuel inlet pipe of the burner through a high-temperature gas pipe (14), and one path of the high-temperature gas pipe (14) is connected with a high-temperature gas bypass pipe (17); the lime kiln is a sleeve kiln (2), a beam lime kiln (11) or a double-hearth kiln (18); the temperature of the gas in the high-temperature gas pipeline (14) between the gasification furnace (8) and the burner is 600-2200 ℃, a fly ash removing device is arranged on the high-temperature gas pipeline (14), and the high-temperature gas pipeline (14) is provided with an inner heat preservation layer, an outer heat preservation layer or an inner heat preservation layer or an outer heat preservation layer or a heat insulation layer; the fuel in the gasification furnace (8) is pulverized coal or/and lump coal, and the gasification furnace (8) is in other structural forms capable of realizing combustion of carbon-containing substances and combustion-supporting gas of oxygen enrichment, pure oxygen or air to generate gas mixture mainly containing carbon monoxide;
the sleeve kiln (2) is provided with an upper combustion chamber (6) and a lower combustion chamber (9), and the upper combustion chamber (6) and the lower combustion chamber (9) are respectively provided with a burner (5); the burner (5) is provided with a combustion air inlet pipeline and a fuel inlet pipeline, the combustion air inlet pipeline is connected with a combustion air pipeline or a blower, and a gas outlet pipe (4) of the gasifier (8) is connected to the fuel inlet pipelines of the burner of the upper combustion chamber (6) and the burner of the lower combustion chamber (9) through a high-temperature gas pipeline (14);
the beam lime kiln (11) is provided with an upper combustion beam (12), a lower combustion beam (13) and a gas distributor (16), wherein the upper combustion beam (12) and the lower combustion beam (13) are respectively provided with a burner, the burner is provided with a combustion-supporting air inlet pipeline and a fuel inlet pipeline, and the combustion-supporting air inlet pipeline is connected with a combustion-supporting air pipeline or a blower; the gas outlet pipe (4) of the gasifier (8) is connected to gas distributors (16) on two sides of the beam lime kiln through a high-temperature gas pipeline (14), and the gas distributors (16) are connected to fuel inlet pipelines of the burner of the upper combustion beam (12) and the burner of the lower combustion beam (13);
the double-hearth kiln (18) comprises two kiln hearths, wherein the two kiln hearths are respectively provided with an inserted burner (15), a gas distributor (16) and a combustion-supporting air inlet (22), and the combustion-supporting air inlet is connected with a combustion-supporting air pipeline; the gas outlet pipe (4) of the gasifier (8) is connected to the gas distributors (16) of the two kiln bores through a high-temperature gas pipeline (14) and a high-temperature three-way reversing valve (20), and the gas distributors (16) are connected to the fuel inlet pipeline of the inserted burner (15).
2. The gasifier high temperature gas hot feed direct fired lime kiln of claim 1, wherein: the sleeve kiln (2) is provided with an upper inner sleeve (1), a lower inner sleeve (3), an ejector (7) and a circulating smoke outlet (23), and the circulating smoke outlet (23) is positioned at the upper parts of the upper combustion chamber (6) and the lower combustion chamber (9); the upper inner sleeve (1) is connected to an exhaust emission system through a smoke outlet pipe (10), the lower inner sleeve (3) is connected to an injection gas inlet of the injector (7) through a circulating smoke outlet, a driving gas inlet of the injector (7) is connected with a driving air pipe, and an outlet of the injector (7) is connected with an upper combustion chamber (6) and/or a lower combustion chamber (9).
3. The gasifier high temperature gas hot feed direct fired lime kiln of claim 1, wherein: the double-hearth kiln (18) is provided with a gas pressure-stabilizing reflux device (19), and the gas pressure-stabilizing reflux device (19) is arranged on the high-temperature gas pipeline (14) in parallel; the plug-in burner (15) is of a sleeve type structure with a cooling layer, and cooling air or cooling liquid is arranged in the cooling layer.
4. The gasifier high temperature gas hot feed direct fired lime kiln of claim 1, wherein: the combustion-supporting air of the combustion-supporting air inlet pipeline is oxygen-enriched, pure oxygen or air.
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| CN201811594544.XA CN109574523B (en) | 2018-12-25 | 2018-12-25 | Lime kiln for directly burning high-temperature coal gas of gasification furnace in hot feeding manner |
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| CN201811594544.XA CN109574523B (en) | 2018-12-25 | 2018-12-25 | Lime kiln for directly burning high-temperature coal gas of gasification furnace in hot feeding manner |
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| CN110903042A (en) * | 2019-12-17 | 2020-03-24 | 石家庄新华能源环保科技股份有限公司 | Double-hearth lime kiln with denitration equipment |
| CN111960696B (en) * | 2020-06-29 | 2022-04-05 | 中琉科技有限公司 | Lime kiln for directly burning high-temperature coal gas hot delivery of gasification furnace |
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| CN114315180B (en) * | 2021-08-13 | 2023-04-07 | 山东万达环保科技有限公司 | Vertical sleeve lime kiln |
| CN115849737B (en) * | 2022-12-28 | 2024-03-08 | 包头钢铁（集团）有限责任公司 | Maerz kiln calcination method for high powder surface rate lime |
| CN116143425B (en) * | 2023-02-09 | 2024-03-19 | 唐山金泉冶化科技产业有限公司 | Central burner type lime kiln |
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