CN219976474U - SCR denitrification facility entry cigarette temperature governing system - Google Patents
SCR denitrification facility entry cigarette temperature governing system Download PDFInfo
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- CN219976474U CN219976474U CN202321381185.6U CN202321381185U CN219976474U CN 219976474 U CN219976474 U CN 219976474U CN 202321381185 U CN202321381185 U CN 202321381185U CN 219976474 U CN219976474 U CN 219976474U
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- economizer
- inlet
- scr denitration
- scr
- denitration device
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- 235000019504 cigarettes Nutrition 0.000 title description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000003546 flue gas Substances 0.000 claims abstract description 20
- 230000001105 regulatory effect Effects 0.000 claims abstract description 3
- 238000010438 heat treatment Methods 0.000 claims description 6
- 230000001172 regenerating effect Effects 0.000 claims description 6
- 239000000779 smoke Substances 0.000 abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 239000003054 catalyst Substances 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 6
- 239000003245 coal Substances 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000009257 reactivity Effects 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Landscapes
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The utility model discloses an inlet flue gas temperature regulating system of an SCR denitration device, which comprises an economizer, a first pre-economizer, an SCR denitration device, a second pre-economizer and an air preheater, wherein the economizer, the first pre-economizer, the SCR denitration device, the second pre-economizer and the air preheater are sequentially arranged along the flow direction of flue gas, the inlet of the economizer is connected with a backheating device through a third control valve, the inlet of the first pre-economizer is connected with the backheating device through the first control valve, the outlet of the first pre-economizer is connected with the inlet of the economizer through a first gate valve, the inlet of the second pre-economizer is connected with the backheating device through the second control valve, and the outlet of the second pre-economizer is connected with the inlet of the economizer through the second gate valve. The system can reduce the inlet smoke temperature of the SCR denitration device when the inlet smoke temperature of the high-load SCR denitration device is higher, can improve the inlet smoke temperature of the SCR denitration device when the inlet smoke temperature of the low-load SCR denitration device is lower, and can realize the full-load working condition adjustment of the inlet smoke temperature of the SCR denitration device.
Description
Technical Field
The utility model relates to an inlet smoke temperature regulating system of an SCR denitration device, which is mainly used in the field of coal-fired power station boilers.
Background
In order to meet the latest pollutant emission requirements, many coal-fired units employ Selective Catalytic Reduction (SCR) flue gas denitration systems. With the operation of SCR, a plurality of units face the following problems: when the unit runs under low load, the temperature of flue gas at the inlet of the boiler SCR denitration device is lower, the optimal reaction temperature window of the SCR catalyst can not be reached, and even the temperature is lower than the normal reaction temperature range of the catalyst when the unit runs under low load; when the unit is operated under high load, the temperature of flue gas at the inlet of the boiler SCR denitration device is higher, exceeds the optimal reaction temperature window of the SCR catalyst, and is even higher than the normal reaction temperature interval of the catalyst, so that the average level of SCR reaction efficiency is lower and the denitration cost is increased dramatically in the annual operation state.
Aiming at the problems of low inlet smoke temperature and high temperature of an SCR denitration device, a few solutions are disclosed at home and abroad, for example, in China patent with publication number of CN204648200U, a boiler economizer capable of controlling the temperature of the inlet smoke of the SCR device is disclosed, and the boiler economizer comprises a heat exchange pipeline, an inlet header and an outlet header which are connected with an inlet and an outlet of the heat exchange pipeline, wherein the inlet header is communicated with a cold water pipeline, the outlet header is communicated with a hot water pipeline, two pipelines which are mutually intersected but not communicated are additionally arranged between the cold water pipeline and the hot water pipeline, a first communicating pipeline and a second communicating pipeline are respectively arranged, a controllable valve is clamped on the pipelines, and the water flow direction in the pipeline is changed by controlling the opening and closing of the controllable valve when the economizer is operated under high load or low load, so that the temperature reduction range of smoke in the economizer is controlled, the temperature of the inlet smoke of the SCR device is controlled, and the inlet smoke of the SCR device is ensured to be kept in an optimal reaction temperature range of a denitration catalyst. The system controls the temperature of flue gas at the inlet of the SCR device by changing the arrangement mode of the coal economizer in the forward and reverse directions, so that the service life of the denitration catalyst can be prolonged, and the denitration efficiency can be improved. However, if the system can adjust the working condition that the temperature of the flue gas at the inlet of the SCR device is higher, the system cannot adjust the temperature of the flue gas at the inlet of the SCR device when the temperature of the flue gas at the inlet of the SCR device is lower, and if the system can adjust the working condition that the temperature of the flue gas at the inlet of the SCR device is lower, the system cannot adjust the temperature of the flue gas at the inlet of the SCR device when the temperature of the flue gas at the inlet of the SCR device is higher, namely, the system cannot adjust the temperature of the flue gas at the inlet of the SCR device under the full-load working condition.
At present, an adjusting system does not exist, so that the inlet smoke temperature of the SCR denitration device can be reduced when the inlet smoke temperature of the high-load SCR denitration device is higher, and the inlet smoke temperature of the SCR denitration device can be improved when the inlet smoke temperature of the low-load SCR denitration device is lower, and therefore the full-load working condition adjustment of the inlet smoke temperature of the SCR denitration device is realized.
Disclosure of Invention
The utility model aims to overcome the defects in the prior art, and provides the inlet smoke temperature adjusting system of the SCR denitration device, which has reasonable structural design and can realize the full-load working condition adjustment of the inlet smoke temperature of the SCR denitration device.
The utility model solves the problems by adopting the following technical scheme: the utility model provides a SCR denitrification facility entry flue gas temperature governing system, includes economizer, leading economizer one, SCR denitrification facility, leading economizer two and air heater that follow flue gas flow direction and arrange in proper order, its characterized in that: the inlet of the pre-economizer is connected with the backheating device through a control valve III, the inlet of the pre-economizer is connected with the backheating device through a control valve I, the outlet of the pre-economizer is connected with the inlet of the economizer through a gate valve I, the inlet of the pre-economizer is connected with the backheating device through a control valve II, and the outlet of the pre-economizer is connected with the inlet of the economizer through a gate valve II.
Furthermore, the first pre-economizer and the second pre-economizer are fin-tube heat exchangers, and the first pre-economizer and the second pre-economizer are arranged in parallel; the first pre-economizer is arranged between the economizer and the SCR denitration device, and the second pre-economizer is arranged between the SCR denitration device and the air preheater.
Furthermore, the first pre-economizer and the second pre-economizer realize the adjustment of the inlet smoke temperature of the SCR denitration device in a mode of preheating boiler water.
Furthermore, the first pre-economizer and the second pre-economizer are two independent heat exchanger systems, and can be isolated independently when leakage occurs in the first pre-economizer or the second pre-economizer.
Compared with the prior art, the utility model has the following advantages and effects:
1. waste heat recovery can be effectively realized, so that the power generation coal consumption of the unit is reduced, and the economy of the unit is improved.
2. The full-load working condition adjustment of the inlet smoke temperature of the SCR denitration device is realized; the SCR denitration efficiency can be effectively improved under the working condition of high load or low load of the unit, the service life of the SCR denitration catalyst is prolonged, and the emission concentration of pollutants such as NOx is reduced.
3. Simple structure, reasonable design, unique conception, convenient use and wide application prospect.
Drawings
Fig. 1 is a schematic view of the overall structure of the present utility model.
In the figure: the device comprises an economizer 1, a first pre-economizer 2, an SCR denitration device 3, a second pre-economizer 4, an air preheater 5, a first control valve 6, a second control valve 7, a backheating device 8, a third control valve 9, a first gate valve 10 and a second gate valve 11.
Detailed Description
The present utility model will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present utility model and not limited to the following examples.
Referring to fig. 1, in this embodiment, an inlet flue gas temperature adjusting system of an SCR denitration device includes an economizer 1, a first pre-economizer 2, an SCR denitration device 3, a second pre-economizer 4, and an air preheater 5 sequentially arranged along a flue gas flow direction, an inlet of the economizer 1 is connected to a regenerative heating device 8 through a third control valve 9, an inlet of the first pre-economizer 2 is connected to the regenerative heating device 8 through a first control valve 6, an outlet of the first pre-economizer 2 is connected to an inlet of the economizer 1 through a first gate valve 10, an inlet of the second pre-economizer 4 is connected to the regenerative heating device 8 through a second control valve 7, and an outlet of the second pre-economizer 4 is connected to an inlet of the economizer 1 through a second gate valve 11.
In the embodiment, the first pre-economizer 2 and the second pre-economizer 4 are fin-tube heat exchangers, and the first pre-economizer 2 and the second pre-economizer 4 are arranged in parallel; the first pre-economizer 2 is arranged between the economizer 1 and the SCR denitration device 3, and the second pre-economizer 4 is arranged between the SCR denitration device 3 and the air preheater 5.
In the embodiment, the first pre-economizer 2 and the second pre-economizer 4 realize the adjustment of the inlet smoke temperature of the SCR denitration device 3 by preheating boiler water.
In this embodiment, the first pre-economizer 2 and the second pre-economizer 4 are two independent heat exchanger systems, and can be isolated independently when leakage occurs in the first pre-economizer 2 or the second pre-economizer 4.
When the inlet smoke temperature of the SCR denitration device 3 is too high, the first control valve 6 and the first gate valve 10 are opened, the second control valve 7, the second gate valve 11 and the third control valve 9 are closed, boiler feed water flows into the economizer 1 to be heated after being preheated by the first pre-economizer 2, so that the heat exchange amount of the inlet smoke of the SCR denitration device 3 is increased, the inlet smoke temperature of the SCR denitration device 3 can be effectively reduced, the denitration catalyst is guaranteed to have higher reactivity, and the denitration efficiency is improved.
When the temperature of inlet smoke of the SCR denitration device 3 is too low, the control valve II 7 and the gate valve II 11 are opened, the control valve I6, the gate valve I10 and the control valve III 9 are closed, boiler feed water flows into the economizer 1 to be heated after being preheated by the pre-economizer II 4, hot water entering the economizer 1 is preheated in advance by utilizing the heat of the outlet smoke of the SCR denitration device 3, so that the heat exchange amount of the inlet smoke of the SCR denitration device 3 is reduced, the temperature of the inlet smoke of the SCR denitration device 3 can be effectively improved, the denitration catalyst is ensured to have higher reactivity, and the denitration efficiency is improved.
When the inlet smoke temperature of the SCR denitration device 3 is in the optimal operation temperature range of the catalyst, the control valve III 9 is opened, the control valve I6, the gate valve I10, the control valve II 7 and the gate valve II 11 are closed, and boiler feed water directly flows into the economizer 1 to be heated.
What is not described in detail in this specification is all that is known to those skilled in the art.
Furthermore, the foregoing description of the utility model is provided by way of example only. All equivalent changes in construction, features and principles of the utility model according to the inventive concept are intended to be encompassed by the scope of the utility model. Those skilled in the art may make various modifications, additions and substitutions to the described embodiments without departing from the scope of the utility model as defined in the accompanying claims.
Claims (2)
1. The utility model provides an SCR denitrification facility entry flue gas temperature governing system, includes economizer (1), leading economizer (2), SCR denitrification facility (3), leading economizer two (4) and air heater (5) that follow flue gas flow direction and arrange in proper order, its characterized in that: the inlet of the economizer (1) is connected with the regenerative heating device (8) through a control valve III (9), the inlet of the front-mounted economizer I (2) is connected with the regenerative heating device (8) through a control valve I (6), the outlet of the front-mounted economizer I (2) is connected with the inlet of the economizer (1) through a gate valve I (10), the inlet of the front-mounted economizer II (4) is connected with the regenerative heating device (8) through a control valve II (7), and the outlet of the front-mounted economizer II (4) is connected with the inlet of the economizer (1) through a gate valve II (11).
2. The SCR denitration device inlet flue gas temperature regulating system according to claim 1, wherein: the first pre-economizer (2) and the second pre-economizer (4) are fin-tube heat exchangers, and the first pre-economizer (2) and the second pre-economizer (4) are arranged in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321381185.6U CN219976474U (en) | 2023-06-01 | 2023-06-01 | SCR denitrification facility entry cigarette temperature governing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321381185.6U CN219976474U (en) | 2023-06-01 | 2023-06-01 | SCR denitrification facility entry cigarette temperature governing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219976474U true CN219976474U (en) | 2023-11-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321381185.6U Active CN219976474U (en) | 2023-06-01 | 2023-06-01 | SCR denitrification facility entry cigarette temperature governing system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219976474U (en) |
-
2023
- 2023-06-01 CN CN202321381185.6U patent/CN219976474U/en active Active
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