CN205586756U - Female tubular construction of ammonia is spouted in denitration - Google Patents
Female tubular construction of ammonia is spouted in denitration Download PDFInfo
- Publication number
- CN205586756U CN205586756U CN201620287422.6U CN201620287422U CN205586756U CN 205586756 U CN205586756 U CN 205586756U CN 201620287422 U CN201620287422 U CN 201620287422U CN 205586756 U CN205586756 U CN 205586756U
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- China
- Prior art keywords
- ammonia
- electrically operated
- operated valve
- denitration
- telescopic joint
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
The utility model provides a female tubular construction of ammonia is spouted in denitration, is provided with electric valve including spouting the female pipe of ammonia on spouting the female pipe pipeline of ammonia, and electric valve is connected to PLC, electric valve at least parallelly connectedly set up two, one of them electric valve sets up on the main line, is provided with the bypass on spouting the female pipe pipeline of ammonia, an electric valve sets up in the bypass, is provided with the telescopic joint with the electric valve cooperation on the pipeline the utility model discloses a dual circuit valve control volume of spouting ammonia, control is accurate, even a valve breaks down, still can reach the purpose of accurate control spout ammonia volume through another valve, and the telescopic joint of adoption is rational in infrastructure, and durable is longe -lived, can the effectual normal work of guaranteeing the unit.
Description
Technical field
This utility model relates to a kind of female tubular construction, particularly to a kind of denitration spray ammonia mother's tubular construction, belongs to power plants generating electricity denitration device technical field.
Background technology
Nitrogen oxides is one of three big pollutant of coal-fired plant flue gas discharge, and a lot of power plant use SCR method to carry out denitration, effectively reduce the discharge of nitrogen oxides, but, the escaping of ammonia is affecting the properly functioning of unit.Ammonia spraying amount is directly proportional to nitrogen oxides, ammonia spraying amount deficiency can cause denitration rate to reduce, outlet nitrogen oxides increases, and when spraying ammonia excess, although denitration efficiency, outlet nitrous oxides concentration etc. all can meet requirement, but unnecessary ammonia can react generation ABS (hydrogen sulfate ammonia) with the sulfur trioxide in flue gas, hydrogen sulfate ammonia is attached to the surface of catalyst and can block catalyst and affect its activity；And it is attached on the surface of air preheater heat accumulating element, heat accumulating element dust stratification can be made, the heat exchange efficiency causing heat accumulating element declines, and corrode, secondly, excess of ammonia gas can adsorb on flying dust, change the chemical property of flying dust, affect the recycle value of the flyash that electric precipitation is captured, deposit to reduce the generation of ABS as far as possible, run cigarette temperature and should be higher than that more than the dew point temperature of ABS 20 DEG C, ABS dew point temperature is typically at 300～330 DEG C, additionally, air can be caused new pollution in air by ammonia leakage, it is also to affect atmospheric visibility simultaneously, the key factor of regional air quality.So conservative control ammonia spraying amount in denitration it is critical that.The start and stop of SCR control system are controlled by the ammonia sprayed into, i.e. determine required ammonia flow according to fixing NH3/NOx mol ratio, the product of inlet NOx concentration and flue gas flow produces NOx flow signal, it is exactly basic ammonia flow signal that this signal is multiplied by NH3/NOx mol ratio, SCR control system goes to position ammonia flow control valve according to the ammonia flow demand signal calculated, it is achieved automatically control denitration.Although denitrating system is environmental protecting device, but has close relationship with unit operation, in terms of the situation of the supporting denitrification apparatus power plant gone into operation at present, the control of denitrification apparatus is the most all included in the DCS control system of unit.According to the statistics to more than 10 nitre devices, the I O point number of unit part is probably between 200～770, the I O point number of synergic system is between 130～330, although the I O point number of different process producer system is variant, but substantially can meet the control requirement of denitrating system.The mixing of one of the difficult point for SCR denitrating flue gas field NOx Yu NH3, many Power Plant are when putting into denitrating system, use is all that manually operated door is adjusted, this mode is when unit operation, valve breaks down, it is impossible to dismounting, and ammonia spraying amount is difficult to control to, and unit at properly functioning middle valve if there is fault, then ammonia spraying amount can be had a significant impact.Ammonia spraying amount is little, and denitration efficiency will reduce, and discharged nitrous oxides will exceed standard, to environmental danger；Ammonia spraying amount is big, produces ABS, not only has an impact set steady, also can damage environment simultaneously, and the existing telescopic joint coordinated with valve is in use easily damaged, and affects the normal work of unit.
Summary of the invention
The purpose of this utility model is to overcome the said structure defect of denitration spray ammonia mother's pipe on existing generating set, it is provided that a kind of denitration spray ammonia mother's tubular construction.
For realizing the purpose of this utility model, have employed following technical scheme: ammonia mother's tubular construction is sprayed in a kind of denitration, including spray ammonia mother pipe, spray ammonia mother's pipe pipeline is provided with electrically operated valve, electrically operated valve is connected to PLC, described electrically operated valve is at least arranged in parallel two, one of them electrically operated valve is arranged on main line, spray ammonia mother's pipe pipeline is provided with bypass, one electrically operated valve is arranged in bypass, pipeline is equipped with telescopic joint with electrically operated valve, further, telescopic joint it is provided with before electrically operated valve, described telescopic joint uses two-layer ripple struction, two-layer ripple thickness is more than or equal to 5mm, further, described telescopic joint includes inner sleeve, inner sleeve uses double-sleeve structure.
Positive Advantageous Effects of the present utility model is: this utility model uses dual circuit Valve controlling ammonia spraying amount, control accurately, even if a valve breaks down, the purpose reaching accurately to control ammonia spraying amount is remained able to by another valve, the expansion joint structure used is reasonable, durable in use, the life-span is long, it is possible to the effective normal work ensureing unit.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of this utility model spray ammonia mother's pipe.
Fig. 2 is the schematic cross-section of this utility model telescopic joint.
Detailed description of the invention
In order to explain enforcement of the present utility model more fully, it is provided that embodiment of the present utility model.These embodiments are only to elaboration of the present utility model, are not intended to scope of the present utility model.
In conjunction with accompanying drawing explanation further details of to this utility model, accompanying drawing is respectively labeled as: 1: main line；2: bypass；3: electrically operated valve two；4: telescopic joint two；5: electrically operated valve one；6: telescopic joint one；61: double-deck ripple；62: double sleeves.As shown in drawings, a kind of denitration spray ammonia mother's tubular construction, including spray ammonia mother pipe, spray ammonia mother's pipe pipeline is provided with electrically operated valve, electrically operated valve is connected to PLC, described electrically operated valve is at least arranged in parallel two, as shown in drawings, electrically operated valve 1 is arranged on main line 1, spray ammonia mother's pipe pipeline is provided with bypass 2, electrically operated valve 23 is arranged in bypass 2, pipeline is equipped with telescopic joint with electrically operated valve, telescopic joint one shown in 6 is the telescopic joint coordinated with electrically operated valve one, telescopic joint two shown in 4 is the telescopic joint being equipped with electrically operated valve 23, telescopic joint uses two-layer ripple struction, 61 show double-deck ripple, two-layer ripple thickness is more than or equal to 5mm, telescopic joint includes inner sleeve, inner sleeve uses double-sleeve structure, 62 show double sleeve.
After describing embodiment of the present utility model in detail, one of ordinary skilled in the art is clearly understood that, various change and amendment can carried out under spirit without departing from above-mentioned claim, all any simple modification, equivalent variations and modifications above example made according to technical spirit of the present utility model, belong to the scope of technical solutions of the utility model, and this utility model is also not only restricted to the embodiment of example in description.
Claims (3)
1. denitration spray ammonia mother's tubular construction, including spray ammonia mother pipe, it is characterized in that: on spray ammonia mother's pipe pipeline, be provided with electrically operated valve, electrically operated valve is connected to PLC, described electrically operated valve is at least arranged in parallel two, and one of them electrically operated valve is arranged on main line, is provided with bypass on spray ammonia mother's pipe pipeline, one electrically operated valve is arranged in bypass, is equipped with telescopic joint with electrically operated valve on pipeline.
A kind of denitration spray ammonia mother's tubular construction the most according to claim 1, it is characterised in that: being provided with telescopic joint before electrically operated valve, described telescopic joint uses two-layer ripple struction, and two-layer ripple thickness is more than or equal to 5mm.
Ammonia mother's tubular construction is sprayed in a kind of denitration the most according to claim 2, and it lies also in: described telescopic joint includes inner sleeve, and inner sleeve uses double-sleeve structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620287422.6U CN205586756U (en) | 2016-04-08 | 2016-04-08 | Female tubular construction of ammonia is spouted in denitration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620287422.6U CN205586756U (en) | 2016-04-08 | 2016-04-08 | Female tubular construction of ammonia is spouted in denitration |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205586756U true CN205586756U (en) | 2016-09-21 |
Family
ID=56922778
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620287422.6U Expired - Fee Related CN205586756U (en) | 2016-04-08 | 2016-04-08 | Female tubular construction of ammonia is spouted in denitration |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205586756U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107008147A (en) * | 2017-06-09 | 2017-08-04 | 南京电力设备质量性能检验中心 | A kind of ammonia-gas spraying device for SCR denitration system |
-
2016
- 2016-04-08 CN CN201620287422.6U patent/CN205586756U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107008147A (en) * | 2017-06-09 | 2017-08-04 | 南京电力设备质量性能检验中心 | A kind of ammonia-gas spraying device for SCR denitration system |
| CN107008147B (en) * | 2017-06-09 | 2023-01-31 | 国能南京电力试验研究有限公司 | Ammonia spraying device for SCR denitration system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160921 Termination date: 20190408 |