CN208320482U - Denitrating flue gas auxiliary heating system under a kind of depth regulating units ultra-low load - Google Patents
Denitrating flue gas auxiliary heating system under a kind of depth regulating units ultra-low load Download PDFInfo
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- CN208320482U CN208320482U CN201820685096.3U CN201820685096U CN208320482U CN 208320482 U CN208320482 U CN 208320482U CN 201820685096 U CN201820685096 U CN 201820685096U CN 208320482 U CN208320482 U CN 208320482U
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Abstract
The utility model discloses denitrating flue gas auxiliary heating systems under a kind of depth regulating units ultra-low load, including gas burner, flue gas monitoring protective device, denitration gas approach, denitration flue, ammonia-spraying grid, denitration catalyst oxidant layer, gas inlet pipe road and DCS control system；Gas burner and flue gas monitoring protective device are located in denitration gas approach, denitration gas approach is connected with denitration flue, ammonia-spraying grid and denitration catalyst oxidant layer are installed in denitration flue, the outlet in gas inlet pipe road is connected with the entrance of gas burner, gas inlet pipe is provided with valve group on road, the output end of flue gas monitoring protective device is connected with the input terminal of DCS control system, the output end of DCS control system is connected with the control terminal of the control terminal of valve group and gas burner, the system enables to coal unit that can still come into operation under ultra-low load operating condition SCR denitration device.
Description
Technical field
The utility model relates to a kind of auxiliary heating systems, and in particular to flue gas under a kind of depth regulating units ultra-low load
Denitration auxiliary heating system.
Background technique
Contain a large amount of nitrogen oxides (NOx) in the flue gas of coal-burning power plant's discharge, if without purified treatment, it will be to atmosphere
Environment causes seriously to pollute.Station boiler mostly uses greatly selective catalytic reduction (SCR) gas denitrifying technology at present, will be in flue gas
NOx conversion be nontoxic N2.To guarantee denitration efficiency, catalyst inactivation is avoided, above-mentioned reaction requires denitrification apparatus to enter
Between 300 DEG C -450 DEG C of flue-gas temperature of mouth.
Currently, electric system flexible adjustment in China's is short of, and some areas serious abandonment, abandoning light and abandoning water occur and ask
Topic, it is inevitable that Large-scale fire-electricity unit participates in depth peak regulation.The long period running on the lower load can be in when large sized unit peak regulation
(under 50%) even ultra-low load (30%), denitrification apparatus entrance flue gas temperature is difficult to reach catalyst and comes into operation condition (> at this time
310 DEG C), denitrating flue gas can not be carried out, causes unit environmental protection index unqualified, pollutes atmosphere, is imposed a fine by environmental protection administration's wholesale.
Therefore, it explores and establishes coal-burning power plant's ultra-low load denitrating system, environmental protection when for improving unit depth peak modulation capacity, reducing peak regulation
Cost, protection environment etc. are of great significance.
Utility model content
It is ultralow to provide a kind of depth regulating units for the shortcomings that the purpose of the utility model is to overcome the above-mentioned prior arts
Denitrating flue gas auxiliary heating system under load, the system enable to coal unit that can still come into operation under ultra-low load operating condition
SCR denitration device.
In order to achieve the above objectives, denitrating flue gas auxiliary heating under depth regulating units ultra-low load described in the utility model
System includes gas burner, flue gas monitoring protective device, denitration gas approach, denitration flue, ammonia-spraying grid, denitrating catalyst
Layer, gas inlet pipe road and DCS control system；
Gas burner and flue gas monitoring protective device are located in denitration gas approach, denitration gas approach and denitration flue
It is connected, ammonia-spraying grid and denitration catalyst oxidant layer are installed in denitration flue, the outlet in gas inlet pipe road and gas burner
Entrance be connected, be provided with valve group on gas inlet pipe road, the output end and DCS control system of flue gas monitoring protective device
Input terminal be connected, the output end of DCS control system is connected with the control terminal of the control terminal of valve group and gas burner.
The valve group includes shut-off valve and regulating valve, wherein the control terminal of the control terminal of shut-off valve and regulating valve with
The output end of DCS control system is connected.
The outlet of denitration flue has air preheater gas approach.
Gas burner, flue gas monitoring protective device, ammonia-spraying grid and denitration catalyst oxidant layer along the direction of flow of flue gas according to
Secondary distribution.
Shut-off valve and regulating valve are sequentially distributed along the direction of fuel gas flow.
Flue gas monitoring protective device is made of several temperature sensors in formation distribution, wherein each temperature sensor
Output end is connected with the input terminal of DCS control system.
The utility model has the following beneficial effects:
Denitrating flue gas auxiliary heating system is in concrete operations under depth regulating units ultra-low load described in the utility model
When, by flue gas monitoring protective device real-time detection flue-gas temperature, DCS control system is controlled according to the flue-gas temperature that detection obtains
Valve group heats flue gas by gas burner, with adjusting the gas quantity entered in gas burner so that flue gas
Temperature maintains in the range of setting, it is ensured that coal unit is under depth peak regulation and ultra-low load operating condition, and SCR denitration device is still
Can normally come into operation, and ensure that coal unit flue gas emission is up to standard, the flexibility of unit is preferable, have preferable economic benefit and
Environmental benefit.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model.
Wherein, 1 be denitration gas approach, 2 be shut-off valve, 3 be regulating valve, 4 be gas burner, 5 be smoke temperature monitoring protect
Protection unit, 6 be ammonia-spraying grid, 7 be denitration flue, 8 be denitration catalyst oxidant layer, 9 be air preheater gas approach.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawing:
With reference to Fig. 1, denitrating flue gas auxiliary heating system packet under depth regulating units ultra-low load described in the utility model
Include gas burner 4, flue gas monitoring protective device 5, denitration gas approach 1, denitration flue 7, ammonia-spraying grid 6, denitrating catalyst
Layer 8, gas inlet pipe road and DCS control system；Gas burner 4 and flue gas monitoring protective device 5 are located at denitration gas approach 1
Interior, denitration gas approach 1 is connected with denitration flue 7, and ammonia-spraying grid 6 and denitration catalyst oxidant layer 8 are installed in denitration flue 7,
The outlet in gas inlet pipe road is connected with the entrance of gas burner 4, and valve group, flue gas prison are provided on gas inlet pipe road
The output end for surveying protective device 5 is connected with the input terminal of DCS control system, the output end of DCS control system and valve group
Control terminal and the control terminal of gas burner 4 are connected.
The valve group includes shut-off valve 2 and regulating valve 3, wherein the control terminal of shut-off valve 2 and the control terminal of regulating valve 3
It is connected with the output end of DCS control system；The outlet of denitration flue 7 has air preheater gas approach 9.
Gas burner 4, flue gas monitoring protective device 5, ammonia-spraying grid 6 and denitration catalyst oxidant layer 8 are along the side of flow of flue gas
To being sequentially distributed；Shut-off valve 2 and regulating valve 3 are sequentially distributed along the direction of fuel gas flow.
Flue gas monitoring protective device 5 is made of several temperature sensors in formation distribution, wherein each temperature sensor
Output end is connected with the input terminal of DCS control system.
The specific work process of the utility model are as follows:
For coal unit under ultra-low load (under 30%) operating condition, the flue-gas temperature of discharge is lower (300 DEG C of <), is unable to satisfy
The job requirement (310 DEG C~420 DEG C) of denitration catalyst oxidant layer 8.
When the smoke temperature that flue gas monitoring protective device 5 detects is lower than 300 DEG C, DCS control system is sent out to gas burner 4
Enabled instruction out, and control shut-off valve 2 and the opening of regulating valve 3 and heat denitration inlet flue gas so that gas burner 4 is lighted a fire.
When flue-gas temperature reaches setting value high limit (400 DEG C), DCS control system issues load shedding to gas burner 4
Instruction, and turn regulating valve 3 down, fuel quantity is reduced, reduces the power output of gas burner 4, to reduce smoke temperature；When flue-gas temperature is low
In setting value lower bound (320 DEG C), gas burner 4 issues application of load instruction, tunes up regulating valve 3 at this time, increases fuel quantity, increases
The power output of gas burner 4, to improve smoke temperature, to pass through the adjustment effect of regulating valve 3, so that coal unit is in underload
Under, denitration entrance flue gas temperature maintains between the high lower bound (320~400 DEG C) of setting.
When flue-gas temperature is higher than 420 DEG C, then shut-off valve 2 and regulating valve 3 are closed, the fuel of cutting gas burner 4 supplies
It answers, avoids smoke temperature excessively high and damage denitrating catalyst.
Claims (6)
1. denitrating flue gas auxiliary heating system under a kind of depth regulating units ultra-low load, which is characterized in that including fuel gas buring
Device (4), flue gas monitoring protective device (5), denitration gas approach (1), denitration flue (7), ammonia-spraying grid (6), denitrating catalyst
Layer (8), gas inlet pipe road and DCS control system；
Gas burner (4) and flue gas monitoring protective device (5) are located in denitration gas approach (1), denitration gas approach (1) with
Denitration flue (7) is connected, and ammonia-spraying grid (6) and denitration catalyst oxidant layer (8) are installed in denitration flue (7), gas inlet pipe
The outlet in road is connected with the entrance of gas burner (4), and valve group, flue gas monitoring protection dress are provided on gas inlet pipe road
The output end for setting (5) is connected with the input terminal of DCS control system, the output end of DCS control system and the control terminal of valve group
And the control terminal of gas burner (4) is connected.
2. denitrating flue gas auxiliary heating system under depth regulating units ultra-low load according to claim 1, feature exist
In the valve group includes shut-off valve (2) and regulating valve (3), wherein the control of the control terminal and regulating valve (3) of shut-off valve (2)
End is connected with the output end of DCS control system.
3. denitrating flue gas auxiliary heating system under depth regulating units ultra-low load according to claim 1, feature exist
In the outlet of denitration flue (7) has air preheater gas approach (9).
4. denitrating flue gas auxiliary heating system under depth regulating units ultra-low load according to claim 1, feature exist
In gas burner (4), flue gas monitoring protective device (5), ammonia-spraying grid (6) and denitration catalyst oxidant layer (8) are along flow of flue gas
Direction is sequentially distributed.
5. denitrating flue gas auxiliary heating system under depth regulating units ultra-low load according to claim 2, feature exist
In shut-off valve (2) and regulating valve (3) are sequentially distributed along the direction of fuel gas flow.
6. denitrating flue gas auxiliary heating system under depth regulating units ultra-low load according to claim 1, feature exist
Be made of in, flue gas monitoring protective device (5) several temperature sensors being distributed in formation, wherein each temperature sensor it is defeated
Outlet is connected with the input terminal of DCS control system.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820685096.3U CN208320482U (en) | 2018-05-09 | 2018-05-09 | Denitrating flue gas auxiliary heating system under a kind of depth regulating units ultra-low load |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820685096.3U CN208320482U (en) | 2018-05-09 | 2018-05-09 | Denitrating flue gas auxiliary heating system under a kind of depth regulating units ultra-low load |
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| CN208320482U true CN208320482U (en) | 2019-01-04 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109883211A (en) * | 2019-03-29 | 2019-06-14 | 中冶华天工程技术有限公司 | Sintering flue gas heating device |
| CN111664717A (en) * | 2020-05-25 | 2020-09-15 | 中钢集团天澄环保科技股份有限公司 | Intelligent catalytic denitration CO removal and waste heat utilization integrated device |
| CN113156049A (en) * | 2021-05-08 | 2021-07-23 | 西安热工研究院有限公司 | Flue gas moisture retrieves experimental apparatus |
| CN115121101A (en) * | 2022-04-25 | 2022-09-30 | 江苏国信靖江发电有限公司 | Method for adjusting temperature of smoke inlet end of SCR (selective catalytic reduction) system in thermal power generating unit |
-
2018
- 2018-05-09 CN CN201820685096.3U patent/CN208320482U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109883211A (en) * | 2019-03-29 | 2019-06-14 | 中冶华天工程技术有限公司 | Sintering flue gas heating device |
| CN111664717A (en) * | 2020-05-25 | 2020-09-15 | 中钢集团天澄环保科技股份有限公司 | Intelligent catalytic denitration CO removal and waste heat utilization integrated device |
| CN111664717B (en) * | 2020-05-25 | 2022-07-01 | 中钢集团天澄环保科技股份有限公司 | Intelligent catalytic denitration CO removal and waste heat utilization integrated device |
| CN113156049A (en) * | 2021-05-08 | 2021-07-23 | 西安热工研究院有限公司 | Flue gas moisture retrieves experimental apparatus |
| CN115121101A (en) * | 2022-04-25 | 2022-09-30 | 江苏国信靖江发电有限公司 | Method for adjusting temperature of smoke inlet end of SCR (selective catalytic reduction) system in thermal power generating unit |
| CN115121101B (en) * | 2022-04-25 | 2023-10-10 | 江苏国信靖江发电有限公司 | Method for adjusting temperature of smoke inlet end of SCR (selective catalytic reduction) system in thermal power unit |
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