CN109337717B - Pressurized ignition method for gasification furnace - Google Patents
Pressurized ignition method for gasification furnace Download PDFInfo
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- CN109337717B CN109337717B CN201811517098.2A CN201811517098A CN109337717B CN 109337717 B CN109337717 B CN 109337717B CN 201811517098 A CN201811517098 A CN 201811517098A CN 109337717 B CN109337717 B CN 109337717B
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- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
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Abstract
When the crushed coal pressurized solid slag discharge gasifier is fed for test, the pressure boosting gas is introduced into the gasifier through the pressure boosting gas pipeline in the start system to raise the system pressure to the ignition pressure, the heating steam is introduced into the gasifier through the gasifying agent pipeline to make the temperature of the outlet of the gasifier reach the ignition temperature, the medium pressure air is introduced into the gasifier through the medium pressure air pipeline in the start system to ignite the raw material coal, and the generated raw gas is discharged through the raw gas pipeline to realize the pressurized ignition of the gasifier. The invention has the advantages of shortening the boosting and grid-connecting time of the system after ignition, reducing resource waste and improving production efficiency.
Description
Technical Field
The invention relates to a method for igniting a gasification furnace, in particular to a method for igniting crushed coal pressurized solid slag discharge gasification furnace under pressure.
Background
The fixed bed crushed coal pressurized solid slag discharging gasification technology is a main gasification technology in the field of coal chemical industry, can use inferior coal gasification, has high pressurized gasification production capacity and low oxygen consumption, is the lowest oxygen consumption method in the three types of gasification methods at present, and has mature and reliable technology, good economic benefit and strong risk resistance.
At present, the crushed coal pressurized gasification technology with the diameter of 3.8m and the pressure of 3.0MPa which has independent intellectual property rights in China successfully applies nearly two hundred sets of gasification furnace devices in the projects of oil preparation from coal, natural gas preparation from coal, methanol preparation from coal, dimethyl ether, ammonia, city gas co-production and the like. In recent years, the technology development of crushed coal pressurized gasification furnaces with the diameter of 5m and the pressure of 6.0MPa is carried out by our company, the gasification capacity of the crushed coal pressurized gasification furnace with the diameter of 5m is increased by 73 percent compared with the gasification furnace with the diameter of 3.8m under the same gasification strength, raw material coal can be suitable for all coal types besides strong caking coal, and for large-scale gasification, the number of the gasification furnaces can be greatly reduced, the investment is reduced, the floor area of a gasification device is reduced, and the maintenance and the operation personnel of the gasification furnaces are reduced.
The prior crushed coal pressurized gasification at 3.0MPa and 4.0MPa adopts low-pressure ignition, the pressure of a gasification system is increased to the pressure of a crude gas pipe network after ignition, the crude gas can be merged into the pipe network for delivery, and the crude gas generated in the pressure increasing process is discharged to a torch system for combustion treatment at present. The low-voltage ignition is adopted, the boosting process time is long, and the boosting process needs 4-5 hours generally, so that great energy waste is caused. On the other hand, as the crushed coal pressure gasification technology is increased from 3.0MPa to 4.0MPa to 6.0MPa, the steam pressure is also continuously increased, and when a crushed coal pressure gasification test at 6.0MPa is carried out, the conventional low-pressure ignition technology is found to be used, the temperature of the temperature-rising steam is reduced too much due to the throttling effect, and the temperature of the steam after throttling can not be increased to the ignition temperature, so that the ignition failure of the crushed coal pressure gasification furnace at 6.0MPa is caused.
Disclosure of Invention
The invention aims to solve the technical problem of providing a pressurized ignition method of a gasification furnace on the basis of the traditional low-pressure ignition technology, realizing pressurized ignition of a crushed coal pressurized gasification furnace, overcoming the problem of ignition failure of the gasification furnace in a high-pressure gasification process, greatly shortening the boosting and grid-connection time of the system after ignition, reducing resource waste and improving the production efficiency.
In order to achieve the purpose, the invention adopts the following technical scheme:
A pressurized ignition method of a gasification furnace comprises the following steps:
When the crushed coal pressurized solid-state slagging gasifier is used for feeding and testing, firstly, boosting gas is introduced into the gasifier through a boosting gas pipeline in a starting system, the system pressure is raised to the ignition pressure, then, heating steam is introduced into the gasifier through a gasifying agent pipeline, the outlet temperature of the gasifier reaches the ignition temperature, then, medium-pressure air is introduced into the gasifier through a medium-pressure air pipeline in the starting system to ignite raw material coal, and generated crude coal gas is discharged through a crude coal gas pipeline to realize the pressurized ignition of the gasifier.
The start-up system comprises a gasification furnace, a gasification agent pipeline, a pressure boosting air pipeline, a medium-pressure air pipeline, a crude gas pipeline and a set start-up program.
The set driving program comprises the following steps:
(1) When the pressure is increased, the medium-pressure air cut-off valve and the gasifying agent pipeline cut-off valve are closed, the pressure increasing gas cut-off valve is opened, the pressure increasing gas is controlled by the flow regulating valve to be led into the gasification furnace system according to a certain flow, and the gasification furnace system is controlled to increase the pressure at the pressure increasing rate of 0.05-0.2MPa/min by continuously regulating the set value of the pressure regulating valve on the crude gas pipeline until the ignition pressure of the gasification furnace system is reached;
(2) And when the gasification furnace system reaches the ignition pressure, closing the medium-pressure air cut-off valve and the boosting gas cut-off valve, setting the set value of the raw gas pressure regulating valve as the ignition pressure value, and keeping the system pressure. Opening a gasification agent pipeline stop valve, introducing heating steam into the furnace through a gasification agent pipeline, heating the steam for 2.5-3.5h, and enabling the temperature of the outlet of the gasification furnace to reach the ignition temperature, wherein the system has the ignition condition;
(3) When the temperature of the outlet of the gasification furnace reaches the ignition temperature, the pressure boosting gas cut-off valve and the gasification agent pipeline cut-off valve are closed, the set value of the coarse coal gas pressure regulating valve is kept as the ignition pressure, the system pressure is kept, the medium pressure air cut-off valve is opened, the medium pressure air ignition flow is controlled through the flow regulating valve, and the ignition of the gasification furnace is finished.
The pressure-boosting gas is inert gas such as medium-pressure nitrogen, carbon dioxide and the like.
The ignition pressure is 1-2MPa lower than the normal operation pressure of the gasification furnace.
The ignition temperature is the temperature at the temperature measuring point of the outlet temperature of the gasification furnace, and the temperature range is 100-150 ℃.
The medium-pressure air ignition flow rate is 1000-1500Nm 3/h。
Compared with the prior art, the invention relates to a pressurized ignition technology of a gasification furnace, which has the innovation points that: (1) based on the traditional low-pressure ignition technology, a first under-pressure ignition method of the crushed coal pressurization solid-state slagging gasification technology is provided; (2) the ignition is carried out under pressure, the temperature-rising steam pressure is reduced, the throttling effect influence is small, the steam temperature is reduced, the furnace temperature can be ensured to reach the ignition temperature, and the problem of ignition failure in the high-pressure gasification process is solved. (3) Through pressure increasing and temperature rising firstly, the pressure rising process can be shortened by 2.5-3 hours after the 4.0Mpa gasification furnace is ignited, about 62-75 t of coal can be saved in the single-furnace single ignition process, the pressure rising time only needs 1-2 hours after the 6.0Mpa gasification furnace is ignited, the resource waste is reduced, and the production efficiency is improved.
Drawings
FIG. 1 is a view of a system for starting up a gasification furnace with ignition under pressure according to the present invention.
As shown in the figure, 1-a medium-pressure air cut-off valve, 2-a gasifying agent cut-off valve, 3-a pressure boosting gas cut-off valve, 4-a flow regulating valve and 5-a coarse gas pressure regulating valve.
Detailed Description
The following detailed description of specific embodiments of the invention is given in conjunction with the accompanying drawings and specific non-limiting examples:
Example 1
When charging and testing the pulverized coal pressurized solid slagging gasifier with the diameter of 5m and the pressure of 6.0MPa, firstly introducing pressurized gas into the gasifier through a pressurized gas pipeline in a start system, raising the system pressure to ignition pressure, then introducing heated steam into the gasifier through a gasifying agent pipeline to enable the temperature of gas at the outlet of the gasifier to reach the ignition temperature, then introducing medium-pressure air into the gasifier through a medium-pressure air pipeline in the start system to ignite raw material coal, discharging generated crude gas through a crude gas pipeline, and realizing the pressurized ignition of the gasifier.
The set driving program is as follows:
(1) When boosting, the medium pressure air cut-off valve 1 is closed, the boosting air cut-off valve 3 is opened, and the boosting air is controlled to 1000Nm through the flow regulating valve 4 3The flow is led into a gasification furnace system, and the pressure increasing rate of the gasification furnace system is controlled to be 0.2Mpa/min by continuously adjusting the set value of a pressure adjusting valve 5 on a crude gas pipeline until the gasification furnace system reaches the ignition pressure;
(2) When the temperature rises, when the gasification furnace system reaches the ignition pressure, the medium-pressure air cut-off valve and the boosting gas cut-off valve are closed, the set value of the raw gas pressure regulating valve is set as the ignition pressure value, and the system pressure is kept. And opening a gasification agent pipeline stop valve 2, and introducing temperature-rising steam into the furnace through a gasification agent pipeline. The temperature of the steam rises for 3h, the temperature of the outlet of the gasification furnace reaches the ignition temperature, and the system has the ignition condition.
(3) When the temperature of the outlet of the gasification furnace reaches the ignition temperature, the pressure boosting gas cut-off valve 1 and the gasification agent pipeline cut-off valve 2 are closed, the set value of the raw gas pressure regulating valve is kept as the ignition pressure, the system pressure is kept, the medium-pressure air cut-off valve 3 is opened, the medium-pressure air ignition flow is controlled through the flow regulating valve 4, and the ignition of the gasification furnace is finished.
(4) And (5) boosting pressure, and after confirming that the ignition of the gasification furnace is successful, switching the system to steam oxygen operation. The pressure increasing rate of the gasification furnace system is controlled to be 0.05Mpa/min by continuously adjusting the set value of the pressure adjusting valve 5 on the crude gas pipeline, the pressure is stabilized for 2min when the pressure is increased by 0.1Mpa, and whether each working condition is stable or not is checked. Until the gasification furnace system reaches the pressure of a pipe network, the gasification furnace is in grid-connected production, the whole pressure boosting process needs 2 hours, and the coal consumption is about 86 t;
The pressure-increasing gas is medium-pressure nitrogen.
The ignition pressure is 4 Mpa.
The ignition temperature is that the outlet temperature of the gasification furnace is higher than 100 ℃ (can be any value between 100 ℃ and 150 ℃).
Example 2
The gasification system with the diameter of 5m and the pressure of 6.0MPa is pressurized by using carbon dioxide, the pressure boosting gas is carbon dioxide, and the pressure boosting gas is 1500Nm 3The flow is led into a gasification furnace system, the pressure increasing rate of the gasification furnace system is 0.1Mpa/min, the temperature of steam is increased for 3.5h, the ignition pressure is 5Mpa, the whole pressure increasing process needs about 1h, and the coal consumption is about 43 t; the rest is the same as example 1.
Example 3
A gasification system with the diameter of 3.8m and the pressure of 4.0MPa is pressurized by medium-pressure nitrogen, and the gasification furnace system is a gasification furnace with the diameter of 3.8m and a crushed coal pressurized solid slag discharge gasification furnace with the gasification pressure of 4.0 MPa; the ignition pressure is 3 Mpa; the whole pressure boosting process needs 1h, and the coal consumption is about 25 t; the rest is the same as example 1.
Example 4
A gasification system with the diameter of 3.8m and the pressure of 4.0MPa is pressurized by carbon dioxide, and the gasification furnace system is a gasification furnace with the diameter of 3.8m and a crushed coal pressurized solid slag discharge gasification furnace with the gasification pressure of 4.0 MPa; lifting press 1200Nm 3Introducing flow into a gasification furnace system at a pressure increasing rate of 0.15Mpa/min, heating steam for 2.5h, and igniting at a pressure of 2.5 Mpa; the whole pressure boosting process needs 1.5h, and the coal consumption is about 37.5 t; the rest is the same as example 1.
Comparative example
The low-pressure ignition of a gasification system with the diameter of 3.8m and the pressure of 4.0Mpa is realized, the low-pressure ignition of a 4.0Mpa crushed coal pressurized solid slag discharge gasification furnace in the prior art is realized, firstly, heating steam is introduced into the furnace through a gasification agent pipeline to ensure that the temperature of gas at the outlet of the gasification furnace reaches the ignition temperature, then, device air is introduced into the gasification furnace to ignite raw material coal, and the generated raw gas is discharged through a raw gas pipeline to realize the normal-pressure ignition of the gasification furnace.
(1) When the temperature is raised, temperature raising steam is introduced into the furnace through a gasifying agent pipeline. And (3) raising the temperature of the steam for 3 hours to enable the temperature of the outlet of the gasification furnace to reach the ignition temperature.
(2) When the gas temperature at the outlet of the gasification furnace is higher than 100 ℃, the stop valve of the gasification agent pipeline is closed, the stop valve on the air pipeline of the device is opened, and the flow of the air ignition of the device is controlled to be 1000Nm through the flow regulating valve 3And h, finishing ignition of the gasification furnace.
(3) And (5) boosting pressure, and after confirming that the ignition of the gasification furnace is successful, switching the system to steam oxygen operation. And controlling the pressure increasing rate of the gasification furnace system to be 0.05Mpa/min, stabilizing the pressure for 2min every time the pressure is increased by 0.1Mpa, and checking whether each working condition is stable. And (3) discharging the crude gas generated in the pressure boosting process to a torch system for combustion treatment until the gasification furnace system reaches the pipe network pressure, carrying out grid-connected production by using the gasification furnace, wherein the whole pressure boosting process needs 4 hours and the coal consumption is about 75 t.
The invention has been described by way of example and not by way of limitation, and various changes, modifications and equivalents may be made in the embodiments described above or may be substituted by one skilled in the art without departing from the scope of the invention.
Claims (3)
1. A pressurized ignition method of a gasification furnace is characterized by comprising the following steps:
When the 4Mpa or 6Mpa crushed coal pressurized solid slagging gasifier is subjected to feeding test, firstly, boosting gas is introduced into the gasifier through a boosting gas pipeline in a start system, the system pressure is raised to ignition pressure, then, heating steam is introduced into the gasifier through a gasifying agent pipeline, so that the temperature of an outlet of the gasifier reaches the ignition temperature, then, medium-pressure air is introduced into the gasifier through a medium-pressure air pipeline in the start system to ignite raw material coal, and generated raw gas is discharged through a raw gas pipeline, so that the pressurized ignition of the gasifier is realized;
The start-up system comprises a gasification furnace, a gasification agent pipeline, a pressure boosting air pipeline, a medium-pressure air pipeline, a crude gas pipeline and a set start-up program;
The set driving program comprises the following steps:
(1) When the pressure is increased, closing the medium-pressure air cut-off valve and the gasifying agent pipeline cut-off valve, opening the pressure-increasing gas cut-off valve, controlling the pressure-increasing gas to be introduced into the gasification furnace system at a certain flow rate through the flow regulating valve, and controlling the gasification furnace system to increase the pressure at the pressure increasing rate of 0.05-0.2 MPa/min through continuously regulating the set value of the pressure regulating valve on the crude gas pipeline until the ignition pressure of the gasification furnace system is reached;
(2) And when the gasification furnace system reaches the ignition pressure, closing the medium-pressure air cut-off valve and the boosting gas cut-off valve, setting the set value of the raw gas pressure regulating valve as the ignition pressure value, and keeping the system pressure. Opening a gasification agent pipeline stop valve, introducing heating steam into the furnace through a gasification agent pipeline, heating the steam for 2.5-3.5 hours, and enabling the temperature of the outlet of the gasification furnace to reach the ignition temperature, wherein the system has the ignition condition;
(3) During ignition, when the temperature of the outlet of the gasification furnace reaches the ignition temperature, the pressure boosting gas cut-off valve and the gasification agent pipeline cut-off valve are closed, the set value of the coarse coal gas pressure regulating valve is kept as the ignition pressure, the system pressure is kept, the medium pressure air cut-off valve is opened, the medium pressure air ignition flow is controlled through the flow regulating valve, and the ignition of the gasification furnace is finished;
The ignition pressure is 1-2 MPa lower than the normal operation pressure of the gasification furnace.
2. The method for igniting a gasification furnace under pressure according to claim 1, wherein the pressure-increasing gas is medium-pressure nitrogen or carbon dioxide.
3. The under-pressure ignition method for the gasification furnace according to claim 1, wherein the ignition flow rate of the medium-pressure air is 1000-1500 Nm 3/h。
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4013739A1 (en) * | 1989-07-24 | 1991-01-31 | Schwarze Pumpe Gas Veb | Starting of static-bed coal gasification reactors - from cold or when already ignited, by adjusting compsn. to steadily increase temp. and treating with steam |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4013739A1 (en) * | 1989-07-24 | 1991-01-31 | Schwarze Pumpe Gas Veb | Starting of static-bed coal gasification reactors - from cold or when already ignited, by adjusting compsn. to steadily increase temp. and treating with steam |
| CN1049024A (en) * | 1989-07-24 | 1991-02-06 | Veb施瓦茨盼普“弗里茨·瑟伯曼”气体联合企业 | Operating method of gasifier |
Non-Patent Citations (1)
| Title |
|---|
| 碎煤加压气化炉空气点火开车方法的改进;祝逢栋;《化肥设计》;20180831;第56卷(第4期);正文第4.2节，第5.1节和第5.2节 * |
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