CN216079870U - System for industry supplies vapour waste heat to be used for denitrification facility to carry effect - Google Patents
System for industry supplies vapour waste heat to be used for denitrification facility to carry effect Download PDFInfo
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- CN216079870U CN216079870U CN202121225559.6U CN202121225559U CN216079870U CN 216079870 U CN216079870 U CN 216079870U CN 202121225559 U CN202121225559 U CN 202121225559U CN 216079870 U CN216079870 U CN 216079870U
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- flue gas
- steam
- denitration device
- heat exchanger
- waste heat
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Abstract
The utility model discloses a system for improving the efficiency of a denitration device by using industrial steam supply waste heat. The utility model reasonably utilizes the waste heat of the industrial steam supply, reduces the superheat degree between the steam at the steam extraction port and the requirement of a user, further reduces the energy consumption level of the unit, and further improves the operation economy. The utility model has the advantages of small transformation range, low investment cost and high operation reliability, and is beneficial to further popularization and application.
Description
Technical Field
The utility model belongs to the field of cogeneration of heat and power of coal-fired power generating sets, and particularly relates to a system for improving the efficiency of a denitration device by using industrial steam supply waste heat.
Background
In recent years, with the increasing of the installed proportion of new energy, the problem of insufficient peak regulation capability of a power system becomes more prominent. In order to assist new energy consumption, large coal-fired power generating sets have become the 'main force' of deep peak shaving. When a coal-fired generator set frequently participates in deep peak regulation and operates at low load for a long time, the inlet flue gas temperature of the denitration device is greatly reduced due to factors such as low boiler load, low water supply temperature and the like, and deviates from a catalytic efficient operation temperature interval, so that the activity of the catalyst is reduced, the denitration efficiency is reduced, the ammonia escape rate is increased, the emission of nitric oxide NOx is not up to the standard, and the serious environmental protection problem is caused. The existing solutions mainly include the following three types: (1) the coal economizer is arranged in a segmented mode. The coal economizer of the boiler is designed into two parts, the low-temperature part of the coal economizer is arranged on the outlet side of the denitration device, and the denitration device is arranged in the region with higher flue gas temperature, so that the problem that low-load flue gas temperature is too low to operate is solved. (2) The economizer is provided with a bypass flue. And a part of flue gas is directly led to the denitration device in front of the economizer, so that the inlet flue gas temperature of the denitration device under low load is increased to maintain the operation of the denitration device. The method has the cost of influencing the boiler efficiency when being put into use, the flue gas temperature regulating range is 20-40 ℃, and the requirement on the reliability of the flue gas baffle is high. (3) Set up No. zero high pressure feed water heater, follow high-pressure cylinder certain grade and draw the steam heating No. 1 high pressure feed water heater feedwater, improve boiler feed water temperature, avoid leading to the unable normal operating of denitrification facility because the too big export flue gas temperature that arouses of heat transfer difference in the economizer is low. Therefore, the problems of large transformation range, high investment cost and low operation reliability of the existing solutions for low inlet smoke temperature of the denitration device under low load in different degrees
A large number of coal-fired generating sets undertake external industrial steam supply through technical transformation, wherein the mode of realizing the external steam supply of the generating sets through the transformation of middle-exhaust adjustable heat supply steam extraction is generally applied, and the steam supply mode adopts a steam extraction pipeline which is perforated and is led out from a middle-low pressure cylinder communicating pipe to serve as a steam supply source. The exhaust temperature of the intermediate pressure cylinder is about 380-390 ℃, and the steam parameters required by users are mostly concentrated below 240 ℃. Therefore, the waste heat of the industrial steam supply is reasonably and effectively utilized, the superheat degree between the steam at the steam extraction port and the user requirement is reduced, and the energy consumption level of the unit is further reduced so as to respond to the requirements of an energy-saving and emission-reducing policy.
Disclosure of Invention
The utility model aims to solve the problem that the flue gas temperature at the inlet of a denitration device is too low to cause the normal operation when a unit is in deep peak regulation and low load operation, and provides a system for applying industrial steam supply waste heat to the denitration device to improve the efficiency, which can reasonably and effectively utilize the industrial steam supply waste heat, reduce the superheat degree between steam at a steam extraction port and user requirements, and further reduce the energy consumption level of the unit.
In order to achieve the purpose, the utility model comprises a boiler and a flue gas denitration device, wherein a flue gas connecting pipeline between the boiler and the flue gas denitration device is connected with a heat exchanger.
The cold source steam inlet side of the heat exchanger is connected with the outlet flue of the boiler, and the steam outlet side of the heat exchanger is connected with the steam inlet flue of the flue gas denitration device.
The heat source steam inlet side of the heat exchanger is connected with an industrial steam extraction pipeline, and the steam outlet side of the heat exchanger supplies steam outwards.
The flue gas denitrification device is connected with the air preheater, the air preheater is connected with the dust remover, the dust remover is connected with the draught fan, the draught fan is connected with the desulfurizing tower, and the desulfurizing tower is connected with the chimney.
Compared with the prior art, the utility model is provided with the heat exchanger, the heat exchanger utilizes the waste heat of the industrial steam supply to heat the flue gas at the outlet of the coal economizer of the boiler, the flue gas at the outlet of the coal economizer enters the denitration device after being heated by the heat exchanger, the inlet flue gas temperature of the denitration device is effectively improved, and the normal operation of the denitration device under low load is ensured. The utility model reasonably utilizes the waste heat of the industrial steam supply, reduces the superheat degree between the steam at the steam extraction port and the requirement of a user, further reduces the energy consumption level of the unit, and further improves the operation economy. The utility model has the advantages of small transformation range, low investment cost and high operation reliability, and is beneficial to further popularization and application.
Drawings
FIG. 1 is a block diagram of the system of the present invention;
the system comprises a boiler 1, a flue gas denitration device 2, an air preheater 3, a dust remover 4, an induced draft fan 5, a desulfurizing tower 7, a chimney 8, a heat exchanger 9 and an industrial steam extraction pipeline.
Detailed Description
The utility model is further described below with reference to the accompanying drawings.
Referring to fig. 1, the utility model comprises a boiler 1 and a flue gas denitration device 2, wherein a flue gas connecting pipeline between the boiler 1 and the flue gas denitration device 2 is connected with a heat exchanger 8. The cold source steam inlet side of the heat exchanger 8 is connected with the outlet flue of the boiler 1, and the steam outlet side of the heat exchanger 8 is connected with the steam inlet flue of the flue gas denitration device 2. Flue gas denitrification facility 2 connects air preheater 3, and air preheater 3 connects dust remover 4, and draught fan 5 is connected to dust remover 4, and desulfurizing tower 6 is connected to draught fan 5, and desulfurizing tower 6 connects chimney 7. The heat source steam inlet side of the heat exchanger 8 is connected with an industrial steam extraction pipeline 9, and the steam outlet side of the heat exchanger 8 supplies steam to the outside.
The working method of the utility model comprises the following steps:
one part of flue gas generated by the boiler 1 enters the flue gas denitration device 2, and the other part of flue gas enters the heat exchanger 8.
The flue gas entering the heat exchanger 8 enters the flue gas denitration device 2 after being heated by industrial steam supply; the superheat degree of the industrial steam supply steam is utilized by the flue gas, and the steam is supplied to the outside after cooling.
The flue gas denitration device 2 discharges the flue gas into downstream equipment.
The utility model provides a solution for heating the flue gas at the outlet of the economizer by using the waste heat of the industrial steam supply to realize the higher flue gas temperature at the inlet of the denitration device.
Claims (2)
1. A system for using industrial steam supply waste heat for efficiency improvement of a denitration device is characterized by comprising a boiler (1) and a flue gas denitration device (2), wherein a flue gas connecting pipeline between the boiler (1) and the flue gas denitration device (2) is connected with a heat exchanger (8);
the steam inlet side of a cold source of the heat exchanger (8) is connected with an outlet flue of the boiler (1), and the steam outlet side of the heat exchanger (8) is connected with a steam inlet flue of the flue gas denitration device (2);
the heat source steam inlet side of the heat exchanger (8) is connected with an industrial steam extraction pipeline (9), and the steam outlet side of the heat exchanger (8) supplies steam outwards.
2. The system for improving the efficiency of the denitration device by using the waste heat of the industrial steam supply according to claim 1, wherein the flue gas denitration device (2) is connected with the air preheater (3), the air preheater (3) is connected with the dust remover (4), the dust remover (4) is connected with the induced draft fan (5), the induced draft fan (5) is connected with the desulfurizing tower (6), and the desulfurizing tower (6) is connected with the chimney (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121225559.6U CN216079870U (en) | 2021-06-02 | 2021-06-02 | System for industry supplies vapour waste heat to be used for denitrification facility to carry effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121225559.6U CN216079870U (en) | 2021-06-02 | 2021-06-02 | System for industry supplies vapour waste heat to be used for denitrification facility to carry effect |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216079870U true CN216079870U (en) | 2022-03-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121225559.6U Active CN216079870U (en) | 2021-06-02 | 2021-06-02 | System for industry supplies vapour waste heat to be used for denitrification facility to carry effect |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216079870U (en) |
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2021
- 2021-06-02 CN CN202121225559.6U patent/CN216079870U/en active Active
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