CN219624088U - Adjusting system for temperature of medium-temperature SCR denitration flue gas - Google Patents
Adjusting system for temperature of medium-temperature SCR denitration flue gas Download PDFInfo
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- CN219624088U CN219624088U CN202223505937.3U CN202223505937U CN219624088U CN 219624088 U CN219624088 U CN 219624088U CN 202223505937 U CN202223505937 U CN 202223505937U CN 219624088 U CN219624088 U CN 219624088U
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- Prior art keywords
- flue gas
- gas cooler
- temperature
- pipe
- water
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 114
- 239000003546 flue gas Substances 0.000 title claims abstract description 114
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 62
- 239000000428 dust Substances 0.000 claims abstract description 9
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 8
- 230000023556 desulfurization Effects 0.000 claims abstract description 7
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 238000010521 absorption reaction Methods 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Chimneys And Flues (AREA)
Abstract
The utility model provides a system for adjusting the temperature of flue gas in medium-temperature SCR denitration, relates to the field of flue gas temperature adjustment, and solves the problem that the existing flue gas needs to be additionally heated by steam to reach the denitration reaction temperature; the boiler comprises a first flue gas cooler and a second flue gas cooler; the flue gas outlet of the first flue gas cooler is sequentially connected with the desulfurization and dust removal system, the denitration system and the second flue gas cooler; the water outlet of the air preheater is connected with the water inlet of the first flue gas cooler through a second pipe; and the second pipe is provided with a second valve. According to the utility model, the flue gas between the first flue gas cooler and the second flue gas cooler in the boiler is used, additional steam heating is not needed, the denitration reaction temperature can be met after the temperature adjustment is performed by using water, and the water after heat absorption also enters the economizer, so that the heat of the flue gas is utilized.
Description
Technical Field
The utility model relates to the field of flue gas temperature regulation, in particular to a medium-temperature SCR denitration flue gas temperature regulation system.
Background
With the improvement of national environmental protection requirements, the environmental protection requirements of many biomass power generation projects are ultra-clean emission of flue gas, namely SO at flue gas outlet 2 The concentration is not higher than 35mg/m 3 NOx outlet concentration is not higher than 50mg/m 3 The dust outlet concentration is 5mg/m 3 . When the flue gas is denitrated, the denitration reaction temperature is generally maintained between 220 ℃ and 240 ℃ in order to meet the NOx outlet emission requirement, but the exhaust gas temperature at the tail part of the boiler is generally about 110 ℃, and the discharged flue gas is required to be denitrated and heated again. For example, patent publication number CN206621993U discloses an SCR denitration flue gas temperature adjusting system, which uses steam to heat flue gas to about 220 ℃ to reach the temperature required for denitration treatment, but the consumption of steam increases energy consumption and increases economic cost.
Disclosure of Invention
The utility model aims to provide a system for adjusting the temperature of flue gas in medium-temperature SCR denitration, which solves the problem that the existing flue gas needs to be additionally heated by steam to reach the denitration reaction temperature.
The embodiment of the utility model is realized by the following technical scheme:
a system for adjusting the temperature of medium-temperature SCR denitration flue gas comprises a boiler, a desulfurization and dust removal system, a denitration system and an air preheater; the boiler comprises a first flue gas cooler and a second flue gas cooler; the flue gas outlet of the first flue gas cooler is sequentially connected with the desulfurization and dust removal system, the denitration system and the second flue gas cooler; the water outlet of the air preheater is connected with the water inlet of the first flue gas cooler through a second pipe; and the second pipe is provided with a second valve.
Preferably, a flue gas outlet of the second flue gas cooler is connected with an induced draft fan.
Preferably, the water outlet of the second flue gas cooler is connected with the water inlet of the first flue gas cooler.
Preferably, the main water supply pipe is included; the main water supply pipe is connected with the water inlet of the air preheater and is connected with the water inlet of the second flue gas cooler through a first pipe; the first pipe is provided with a first valve.
Preferably, the water outlet of the first flue gas cooler and the water outlet of the second flue gas cooler are also connected with an economizer; and a valve III is arranged on a pipe III connected with the economizer by the second flue gas cooler.
Preferably, the main water supply pipe is connected with the water inlet of the first flue gas cooler through a pipe IV; the fourth pipe is provided with a valve IV; the main water supply pipe is connected with the economizer.
Preferably, the air preheater is connected with the economizer through a pipe five; the fifth pipe is provided with a valve five.
The technical scheme of the embodiment of the utility model has at least the following advantages and beneficial effects:
according to the utility model, the final exhaust of the boiler is not used any more, but the flue gas between the first flue gas cooler and the second flue gas cooler in the boiler is used, the temperature of the flue gas is higher than that of the final exhaust and is generally higher than 220 ℃, no additional steam heating is needed, the denitration reaction temperature can be met after the temperature adjustment is carried out by using water, and the water after heat absorption also enters the economizer, so that the heat of the flue gas is utilized.
Drawings
In order to more clearly describe the technical solution of the embodiments of the present utility model, the drawings required to be used in the embodiments will be briefly described, it should be understood that the following drawings only show the present utility model
Certain embodiments of the pattern should not be taken as limiting the scope, and other embodiments may be obtained from these drawings without inventive effort by those of ordinary skill in the art 5
Related drawings.
FIG. 1 is a schematic diagram of a system for regulating the temperature of medium-temperature SCR denitration flue gas;
icon: 1-desulfurization dust removal system, 2-denitration system, 3-air preheater and 4-first flue gas cooling
The device comprises a 5-second flue gas cooler, a 6-pipe II, a 7-induced draft fan, an 8-pipe I, a 9-economizer, a 10-pipe III, a 0-11-main water supply pipe, a 12-pipe IV and a 13-pipe V.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present utility model more clear, the technical solutions of the embodiments of the present utility model will be described below with reference to the accompanying drawings in the embodiments of the present utility model
It will be apparent that the embodiments described are some, but not all embodiments of the utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Example 1
As shown in FIG. 1, the system for adjusting the temperature of the medium-temperature SCR denitration flue gas comprises a boiler, a desulfurization and dust removal system 1, a denitration system 2 and an air preheater 3; the boiler comprises a first flue gas cooler 0 4 and a second flue gas cooler 5; the flue gas outlet of the first flue gas cooler 4 is sequentially connected with the desulfurization and dust removal system 1, the denitration system 2 and the second flue gas cooler 5; the water outlet of the air preheater 3 is connected with the water inlet of the first flue gas cooler 4 through a second pipe 6; the second pipe 6 is provided with a second valve.
In the specific implementation process, hot air in the air preheater 3 is sent into the boiler to support combustion, and the temperature of the air is improved to be beneficial to the stability of combustion in the hearth. When the flue gas temperature of the first flue gas cooler 4 is higher than 240 ℃, the flow of the low-temperature water can be adjusted by adjusting the valve II.
In this embodiment, a flue gas outlet of the second flue gas cooler 5 is connected with a draught fan 7.
In this embodiment, the water outlet of the second flue gas cooler 5 is connected to the water inlet of the first flue gas cooler 4.
In the specific implementation process, the water of the water inlet of the first flue gas cooler 4 is provided by the water outlet of the second pipe 6 and the second flue gas cooler 5, and when the outlet flue gas temperature of the first flue gas cooler 4 is higher than 240 ℃): a. the second valve is regulated to mix the low-temperature water from the air preheater 3 with the water from the second flue gas cooler 5, so as to reduce the inlet water temperature of the first flue gas cooler 4 and reduce the outlet flue gas temperature of the first flue gas cooler 4; b. the flue gas temperature is too high, the temperature adjustment can not be completed through the second pipe 6, the main water supply flow can be increased, and the temperature of the flue gas entering the first flue gas cooler 4 can be reduced.
In this embodiment, a main water feed pipe 11 is included; the main water supply pipe 11 is connected with the water inlet of the air preheater 3 and is connected with the water inlet of the second flue gas cooler 5 through a first pipe 8; the first pipe 8 is provided with a first valve.
In the specific implementation process, the main water supply pipe 11 is high-temperature water. The first pipe 8 can regulate the amount of water entering the air preheater 3 to control the temperature of the air entering the boiler and can form a bypass when the air preheater 3 is not in use.
In this embodiment, the water outlet of the first flue gas cooler 4 and the water outlet of the second flue gas cooler 5 are further connected with an economizer 9; and a valve III is arranged on a pipe III 10 connected with the economizer 9 by the second flue gas cooler 5.
In the specific implementation process, when the outlet flue gas temperature of the first flue gas cooler 4 is lower than 220 ℃): firstly, the valve III is regulated to reduce the water inflow into the first flue gas cooler 4 and improve the flue gas temperature at the outlet of the first flue gas cooler 4. When the first flue gas cooler 4 is not in use, the third pipe 10 may form a passageway to recover heat from the flue gas.
In this embodiment, the main water supply pipe 11 is connected to the water inlet of the first flue gas cooler 4 through a pipe four 12; the fourth pipe 12 is provided with a fourth valve; the main water supply pipe 11 is connected with the economizer 9.
In the specific implementation process, when the denitration temperature of 220 ℃ cannot be met by only adjusting the valve III, the valve III is adjusted to the maximum, and meanwhile, the valve IV is adjusted, so that the inlet water temperature of the first flue gas cooler 4 is improved, and even when the flue gas temperature is lower than the water supply temperature, the flue gas can be directly heated by the water supply to reach the denitration temperature; if the flue gas temperature is too low and the denitration temperature cannot be satisfied by the third valve and the fourth valve, the flow of the water fed into the economizer 9 needs to be reduced, and the temperature of the flue gas fed into the first flue gas cooler 4 is increased.
In the embodiment, the air preheater 3 is connected with the economizer 9 through a pipe five 13; the fifth pipe 13 is provided with a valve five.
In a specific implementation process, the fifth pipe 13 is a bypass system when none of the flue gas coolers is in use.
The above is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (7)
1. The system for adjusting the temperature of the medium-temperature SCR denitration flue gas is characterized by comprising a boiler, a desulfurization and dust removal system, a denitration system and an air preheater; the boiler comprises a first flue gas cooler and a second flue gas cooler; the flue gas outlet of the first flue gas cooler is sequentially connected with the desulfurization and dust removal system, the denitration system and the second flue gas cooler; the water outlet of the air preheater is connected with the water inlet of the first flue gas cooler through a second pipe; and the second pipe is provided with a second valve.
2. The medium temperature SCR denitration flue gas temperature regulating system according to claim 1, wherein the flue gas outlet of the second flue gas cooler is connected with a draught fan.
3. The medium temperature SCR denitration flue gas temperature regulation system according to claim 1, wherein the water outlet of the second flue gas cooler is connected to the water inlet of the first flue gas cooler.
4. The medium temperature SCR denitration flue gas temperature regulation system according to claim 1, comprising a main water feed pipe; the main water supply pipe is connected with the water inlet of the air preheater and is connected with the water inlet of the second flue gas cooler through a first pipe; the first pipe is provided with a first valve.
5. The medium temperature SCR denitration flue gas temperature regulating system according to claim 4, wherein the water outlet of the first flue gas cooler and the water outlet of the second flue gas cooler are also connected with an economizer; and a valve III is arranged on a pipe III connected with the economizer by the second flue gas cooler.
6. The medium temperature SCR denitration flue gas temperature regulation system according to claim 5, wherein the main water supply pipe is connected to the water inlet of the first flue gas cooler through a pipe four; the fourth pipe is provided with a valve IV; the main water supply pipe is connected with the economizer.
7. The medium temperature SCR denitration flue gas temperature regulating system according to claim 6, wherein the air preheater is connected with the economizer through a pipe five; the fifth pipe is provided with a valve five.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223505937.3U CN219624088U (en) | 2022-12-27 | 2022-12-27 | Adjusting system for temperature of medium-temperature SCR denitration flue gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223505937.3U CN219624088U (en) | 2022-12-27 | 2022-12-27 | Adjusting system for temperature of medium-temperature SCR denitration flue gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219624088U true CN219624088U (en) | 2023-09-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223505937.3U Active CN219624088U (en) | 2022-12-27 | 2022-12-27 | Adjusting system for temperature of medium-temperature SCR denitration flue gas |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219624088U (en) |
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2022
- 2022-12-27 CN CN202223505937.3U patent/CN219624088U/en active Active
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