CN211290009U - High-temperature economizer for tail flue of thermal generator set - Google Patents
High-temperature economizer for tail flue of thermal generator set Download PDFInfo
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- CN211290009U CN211290009U CN201922433092.3U CN201922433092U CN211290009U CN 211290009 U CN211290009 U CN 211290009U CN 201922433092 U CN201922433092 U CN 201922433092U CN 211290009 U CN211290009 U CN 211290009U
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Abstract
A high-temperature economizer of a tail flue of a thermal generator set comprises a light pipe type economizer, a first H-shaped economizer and a second H-shaped economizer, wherein the light pipe type economizer, the first H-shaped economizer and the second H-shaped economizer are arranged in a front shaft flue, the light pipe economizer is arranged below a low-temperature superheater in the front shaft flue, an intermediate partition wall is arranged between the front shaft flue and the rear shaft flue, the first H-shaped high-temperature economizer and the second H-shaped high-temperature economizer which are connected in series are respectively arranged below the light pipe economizer and the low-temperature reheater, the first H-shaped high-temperature economizer and the light pipe economizer are connected in series, pipe screens of the first H-shaped high-temperature economizer and the second H-shaped high-temperature economizer penetrate through the intermediate partition wall to be communicated with each other, the device is low in modification cost, the smoke temperature reduction and the water supply temperature can be effectively guaranteed, and the problems that the smoke temperature reduction and the water supply are influenced by the adjustment of a smoke baffle, the heat exchange amount of the economizer is relatively balanced compared with that of a single-side arrangement form.
Description
Technical Field
The invention relates to a high-temperature economizer for a tail flue of a thermal generator set.
Background
The tail flue of the thermal power generating set is divided into a front vertical shaft flue and a rear vertical shaft flue, the front vertical shaft flue and the rear vertical shaft flue are separated by a partition wall, the front flue and the rear flue are not communicated with each other so as to adjust a baffle, a low-temperature reheater and a low-temperature superheater are respectively arranged in the front vertical shaft flue and the rear vertical shaft flue, a high-temperature economizer is arranged in the front vertical shaft flue or the rear vertical shaft flue, flue gas is shunted by adjusting the opening of the flue gas baffle so as to adjust the steam temperature, in recent years, because of the high limit value of the inlet flue gas temperature of a denitration catalyst and the requirement of energy conservation, efficiency improvement is carried out in a mode of increasing the heat exchange area of the high-temperature economizer and improving the heat exchange efficiency, a common mode is that the light pipe bundles of the light pipe economizer are added in the front vertical shaft flue or the rear vertical shaft flue, and the forms of, burning operating mode transform frequently, the over heater, reheater flue gas baffle also often changes according to the steam temperature and carries out the aperture adjustment, if will increase the economizer in low temperature over heater below, because space restriction, if will guarantee to reform transform the effect, there is the not enough problem in space, if increase the tube panel in the below of low temperature reheater one side, through the pipe connection mode, because the setting of middle part partition wall, then must increase the economizer header in low temperature reheater below, the load increases by a wide margin, reform transform with high costs, and there is the safe risk that two sets of economizer inflation differ.
Disclosure of Invention
The invention solves the defects of the existing conditions and provides the high-temperature economizer of the tail flue of the thermal generator set, which has low modification cost, effectively ensures the temperature drop of smoke and the temperature rise of water supply, overcomes the influence of the opening adjustment of a smoke baffle on the temperature drop of smoke and the temperature rise of water supply and ensures that the heat exchange quantity of the economizer is kept relatively balanced.
A high-temperature economizer of a tail flue of a thermal generator set comprises a light pipe type economizer, an H-shaped economizer and an H-shaped economizer, wherein the light pipe type economizer and the H-shaped economizer are arranged in a front vertical shaft flue, the light pipe economizer is arranged below a low-temperature superheater of the front vertical shaft flue, an intermediate partition wall is arranged between the front vertical shaft flue and the rear vertical shaft flue, a first H-shaped high-temperature economizer and a second H-shaped high-temperature economizer which are connected in series are respectively additionally arranged below the light pipe economizer and a low-temperature reheater, the first H-shaped high-temperature economizer is connected with the light pipe economizer in series, and pipe screens of the first H-shaped high-temperature economizer and the second H-shaped high-temperature economizer penetrate through the intermediate partition wall to be communicated with each other.
Furthermore, the middle partition wall is provided with an opening at a position where the tube panel penetrates, the tube panel is sleeved with a sleeve at the outer side of the position corresponding to the opening, one end of the sleeve is in seal welding with the tube panel, the openings at two sides of the middle partition wall are provided with sealing plates for sealing the openings, and the sealing plates are in seal welding with the sleeve.
Furthermore, a comb-shaped anti-abrasion clamp and an anti-abrasion false pipe are arranged on a row of pipe screens at the tops of the first H-shaped economizer and the second H-shaped economizer.
Furthermore, an anti-abrasion tile is arranged at a connecting pipe elbow between the first H-shaped high-temperature coal economizer and the light pipe coal economizer.
Furthermore, the anti-abrasion cover shells are arranged at the elbows at the two ends of the tube panels of the first H-shaped high-temperature economizer and the second H-shaped high-temperature economizer.
By adopting the structure, the structure changes the arrangement mode that the traditional original coal economizer is only arranged at one side in the front and the rear shaft flues, and the H-shaped high-temperature coal economizer is additionally arranged in the front and the rear shaft flues, the arrangement mode that the H-shaped high-temperature coal economizer is connected with the original light pipe coal economizer in series, under the condition of adjusting the baffle plates of the low-temperature superheater and the low-temperature reheater, a certain amount of smoke gas passes through the H-shaped high-temperature coal economizer in the front and the rear shaft flues, so that the smoke temperature reduction and the water supply temperature can be effectively guaranteed, the influence of the adjustment of the opening degree of the smoke baffle plate on the smoke temperature reduction and the water supply temperature rise is overcome, the heat exchange quantity of the coal economizer is kept relatively balanced in each load section, in addition, because the device is directly transformed on the basis of the structure of the original coal economizer, the transformation cost is low, the sealing plate is arranged at the position of the intermediate partition wall, the pipe screen passes, the problem of weld fracture that mid-board and economizer wall pipe arouse because of stress variation is solved, prevent to wear the thorax wind, solved the potential safety hazard that the pipe panel worn the wall to need not to set up the economizer header, practiced thrift the transformation cost greatly.
In conclusion, the invention has low modification cost, effectively ensures the smoke temperature drop and the water supply temperature, overcomes the influence of the smoke temperature drop and the water supply temperature rise caused by the adjustment of the opening degree of the smoke baffle plate, and ensures that the heat exchange quantity of the economizer is kept relatively balanced.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural view of the tube panel of the present invention passing through the middle partition wall.
The icons are marked as: 1. a front shaft flue; 2. a rear shaft flue; 3. a middle partition wall; 4. a low temperature superheater; 5. a low temperature reheater; 61. a first H-shaped high-temperature economizer; 62. a second H-shaped high-temperature economizer; 7. a sealing plate; 8. a sleeve; 9. and (4) tube panels.
Detailed description of the invention
The present invention is further described in detail with reference to the accompanying drawings and embodiments, and for the purpose of more clearly illustrating the embodiments of the present patent or the technical solutions in the prior art, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings may be obtained according to these drawings without creative efforts.
As shown in fig. 1 and 2, a thermal generator set rear flue high-temperature economizer comprises a light pipe type economizer 4, a first H-type economizer 61 and a second H-type economizer 62 arranged in a front vertical shaft flue 1, wherein the light pipe type economizer 4, the first H-type economizer 61 and the second H-type economizer 62 are arranged in a rear vertical shaft flue 2, the light pipe economizer is arranged below the front vertical shaft flue 1 in a low-temperature superheater, an intermediate partition wall 3 is arranged between the front vertical shaft flue 1 and the rear vertical shaft flue 2, the first H-type high-temperature economizer 61 and the second H-type high-temperature economizer 62 which are mutually communicated are respectively arranged below the light pipe economizer 4 and the low-temperature reheater 5, tube panels 9 of the first H-type high-temperature economizer 61 and the second H-type high-temperature economizer 62 penetrate through the intermediate partition wall 3 to be mutually communicated, an opening is arranged at a position where the tube panel 9 penetrates, a sleeve 8 is sleeved on the outer side of the tube panel 9 at a position corresponding to the, one end of the sleeve 8 is hermetically welded with the tube panel 9, the openings on two sides of the middle partition wall 3 are provided with the sealing plates 7 to seal the openings, and the sealing plates 7 are hermetically welded with the sleeve 8, so that the sleeve and the sealing plates are sealed tightly and smoke-free.
The high-efficiency high-temperature economizer in the application refers to an economizer which is additionally provided with an H-shaped fin economizer on the basis of a primary light pipe type economizer, so that the heat transfer efficiency is increased, the smoke temperature is reduced, and the water supply temperature is increased.
Example (b): the H-shaped high-temperature economizer is arranged in a space with an elevation of 32.994 meters and an elevation of 31.582 meters which is about 1.3 meters below an original light pipe type economizer and a low-temperature reheater. The H-shaped high-temperature economizer comprises two types, namely a double-ribbed pipe and a single-ribbed pipe, wherein the specification of a base pipe of the H-shaped high-temperature economizer adopts phi 51 multiplied by 6.5mm, the material is 20G, and the specification and the material are the same as those of a pipe on a heating surface of an original economizer; the fins of the H-shaped high-temperature economizer have two specifications, namely 38 multiplied by 180mm and 38 multiplied by 40mm, the thickness of each fin is 2mm, the pitch between the fins is 25mm, and the material is acid-washed carbon steel.
The transverse pitch of the H-shaped high-temperature economizer is 152.4mm, and the transverse rows are 78 rows; the number of longitudinal rows is 10 rows in the front vertical shaft flue and 8 rows in the rear vertical shaft flue; the H-shaped high-temperature economizer tube panel is divided into a front part and a rear part, the part in the front vertical shaft flue is a first H-shaped high-temperature economizer, and the part in the rear vertical shaft flue is a second H-shaped high-temperature economizer. The designed smoke velocity of the H-shaped high-temperature economizer is 8.77m/s, and the designed working medium flow velocity is 1.36 m/s.
In this embodiment, the H-type high-temperature economizer adopts the following wear prevention methods: firstly, mounting comb-shaped anti-abrasion clamps and anti-abrasion false pipes on the uppermost row of the H-shaped high-temperature economizer pipe screen; secondly, an anti-abrasion tile is arranged at the bent pipe of the connecting pipe between the H-shaped high-temperature economizer and the light pipe economizer; thirdly, installing large anti-abrasion housings at the elbows at the two ends of the tube panel of the H-shaped high-temperature economizer.
After the device is operated, the temperature rise of water supply of the device is increased by 11.8 ℃, the temperature of flue gas at a denitration inlet is reduced by 33.25 ℃, and the temperature of flue gas is reduced by 15.3 ℃ under test working conditions, which are respectively superior to the expected targets of water supply temperature rise of 4 ℃, denitration inlet temperature reduction of 20 ℃ and flue gas temperature reduction of 8 ℃. Meanwhile, the hot gas and flue gas baffle is freely adjusted, the performance index is kept stable, and the operation index is optimized obviously compared with the operation index after the single-side flue economizer is improved.
In addition, it should be noted that the patent is not limited to the above embodiments, as long as the specific size or shape of the components is not described, the components can be any size or shape corresponding to the structure, and no matter any change is made on the material composition, the structural design provided by the invention is a modification of the invention, and should be considered as being within the protection scope of the invention.
Claims (5)
1. The utility model provides a thermal generator set afterbody flue high temperature economizer which characterized in that: the coal economizer comprises a light pipe type coal economizer, a first H-shaped coal economizer and a second H-shaped coal economizer, wherein the light pipe type coal economizer is arranged in a front vertical shaft flue, the second H-shaped coal economizer is arranged in a rear vertical shaft flue, the light pipe coal economizer is arranged below a low-temperature superheater of the front vertical shaft flue, an intermediate partition wall is arranged between the front vertical shaft flue and the rear vertical shaft flue, a first H-shaped high-temperature coal economizer and a second H-shaped high-temperature coal economizer which are connected in series are respectively arranged below the light pipe coal economizer and a low-temperature reheater, the first H-shaped high-temperature coal economizer is connected with the light pipe coal economizer in series, and pipe screens of the first H-shaped high-temperature coal economizer and the second H-shaped high-temperature coal economizer penetrate through the intermediate.
2. The thermal generator set back flue high-temperature economizer of claim 1, characterized in that: the middle partition wall is provided with an opening at the position where the tube panel penetrates, the outer side of the position, corresponding to the opening, of the tube panel is sleeved with a sleeve, one end of the sleeve is in seal welding with the tube panel, the openings at two sides of the middle partition wall are provided with sealing plates for sealing the openings, and the sealing plates are in seal welding with the sleeve.
3. The thermal generator set back flue high-temperature economizer of claim 2, characterized in that: and a comb-shaped anti-abrasion clamp and an anti-abrasion false pipe are arranged on a row of pipe screens at the tops of the first H-shaped economizer and the second H-shaped economizer.
4. The thermal generator set back flue high-temperature economizer of claim 2, characterized in that: and an anti-abrasion tile is arranged at the elbow of the connecting pipe between the first H-shaped high-temperature economizer and the light pipe economizer.
5. The thermal generator set back flue high-temperature economizer of claim 2, characterized in that: and the anti-abrasion housings are arranged at the elbows at the two ends of the tube panels of the first H-shaped high-temperature economizer and the second H-shaped high-temperature economizer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922433092.3U CN211290009U (en) | 2019-12-30 | 2019-12-30 | High-temperature economizer for tail flue of thermal generator set |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922433092.3U CN211290009U (en) | 2019-12-30 | 2019-12-30 | High-temperature economizer for tail flue of thermal generator set |
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| CN211290009U true CN211290009U (en) | 2020-08-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111043587A (en) * | 2019-12-30 | 2020-04-21 | 大唐石门发电有限责任公司 | High-temperature economizer for tail flue of thermal generator set |
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- 2019-12-30 CN CN201922433092.3U patent/CN211290009U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111043587A (en) * | 2019-12-30 | 2020-04-21 | 大唐石门发电有限责任公司 | High-temperature economizer for tail flue of thermal generator set |
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