CN111773896A - SNCR denitration accurate ammonia injection control system - Google Patents
SNCR denitration accurate ammonia injection control system Download PDFInfo
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- CN111773896A CN111773896A CN202010596500.1A CN202010596500A CN111773896A CN 111773896 A CN111773896 A CN 111773896A CN 202010596500 A CN202010596500 A CN 202010596500A CN 111773896 A CN111773896 A CN 111773896A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/79—Injecting reactants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
- B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
- B05B12/085—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to flow or pressure of liquid or other fluent material to be discharged
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
- B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
- B05B12/10—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to temperature or viscosity of liquid or other fluent material discharged
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2067—Urea
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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Abstract
The invention provides an SNCR denitration accurate ammonia injection control system, which comprises: the ammonia source, the ammonia spraying module, the temperature measuring module and the analysis module; the temperature measurement module distributes in the target area, and the temperature measurement module includes: the ammonia injection system comprises at least two infrared thermometers and a plurality of thermocouples, wherein the parts of the thermocouples are distributed at the upstream section of a target area, the at least two infrared thermometers are distributed at the middle-upstream section of the target area, the rest parts of the thermocouples are distributed at the downstream section of the target area, and an analysis module controls an ammonia injection module to inject ammonia from an ammonia source to the target area based on temperature data collected by a temperature measurement module. According to the invention, by arranging at least two infrared thermometers and a plurality of thermocouples and optimally configuring the distribution modes of the infrared thermometers and the thermocouples, the point measurement is upgraded to the line and surface measurement, the accuracy of the measurement result is improved, the spatial distribution of a temperature field is formed, and the temperature change of a spray gun area is visually displayed in real time.
Description
Technical Field
The invention relates to the technical field of boiler temperature measurement, in particular to an SNCR (selective non-catalytic reduction) denitration accurate ammonia injection control system.
Background
The SNCR denitration technology is a technically mature, economical and practical denitration technology, and is popularized and applied to boilers such as waste incineration power stations and the like in recent years. The SNCR flue gas denitration is implemented by atomizing an amino reducing agent (such as ammonia water and urea) solution into an area with the temperature of 850-1100 ℃ of a hearth by using a spray gun, pyrolyzing the solution to generate gaseous NH3, and reacting the gaseous NH3 without a catalyst3Performing selective non-catalytic reduction reaction with NOx to reduce NOx into N2And H2And O. In recent years, the problems in the SNCR operation are mainly expressed as problems of large ammonia consumption, high ammonia slip, low SNCR denitration efficiency, and the like. The reason is mainly influenced by the following factors:
SNCR operation was significantly affected by the window temperature. The technical key in the SNCR process is the selection of the ammonia spraying position in the furnace, namely the selection of the window temperature. NH at an ideal temperature of 850-1100 DEG C3The reduction reaction with NOx is dominant. When the temperature exceeds 1100 ℃, NH3 is easily oxidized into NOx, the oxidation reaction is dominant, and the NOx content in the flue gas is not reduced but increased. As the temperature decreases, the reduction reaction rate decreases, the reaction is insufficient, the reducing agent is lost, and adverse effects and even new pollution are caused to downstream equipment. In actual operation, due to the influence of boiler load change and combustion, the temperature distribution of the SNCR smoke temperature area is uneven and has migration change, and the ammonia injection amount of the urea spray gun in the high-temperature area or the low-temperature area cannot be adjusted in time under the condition that no temperature measurement means is used for reflecting the change of a temperature field in time. Therefore, it is necessary to provide a further solution to the above problems.
Disclosure of Invention
The invention aims to provide an SNCR (selective non-catalytic reduction) denitration accurate ammonia injection control system to overcome the defects in the prior art.
In order to solve the technical problems, the technical scheme of the invention is as follows:
an SNCR denitration accurate ammonia injection control system, which comprises: the ammonia source, the ammonia spraying module, the temperature measuring module and the analysis module;
the temperature measurement module is distributed in the target area, and the temperature measurement module includes: the ammonia injection system comprises at least two infrared thermometers and a plurality of thermocouples, wherein the parts of the thermocouples are distributed at the upstream section of a target area, the at least two infrared thermometers are distributed at the middle-upstream section of the target area, the rest parts of the thermocouples are distributed at the downstream section of the target area, and the analysis module controls the ammonia injection module to inject ammonia from an ammonia source to the target area based on temperature data collected by the temperature measurement module.
As an improvement of the SNCR denitration accurate ammonia injection control system, the ammonia injection module comprises a spray gun, the spray gun is connected with an ammonia source through a pipeline, and the ammonia source is a container for storing ammonia.
As an improvement of the SNCR denitration accurate ammonia injection control system, the number of the spray guns is one or more, and when the number of the spray guns is more, the spray angles of the spray guns are the same or different.
As an improvement of the SNCR denitration accurate ammonia injection control system, the number of the infrared thermometers is two, and one infrared thermometer is respectively arranged on the left side and the right side of the midstream section.
As an improvement of the SNCR denitration accurate ammonia injection control system, the number of the thermocouples is 12, 6 thermocouples are distributed on the upstream section of the target area, and the rest 6 thermocouples are distributed on the downstream section of the target area.
As an improvement of the SNCR denitration accurate ammonia injection control system, two thermocouples are respectively arranged above, on the left side and on the right side of the upstream section of the target area, and two thermocouples are respectively arranged above, on the left side and on the right side of the downstream section of the target area.
As an improvement of the SNCR denitration accurate ammonia injection control system, the thermocouples of the upstream section are distributed on one section of the target area, and the thermocouples of the downstream section are distributed on the other section of the target area.
As an improvement of the SNCR denitration accurate ammonia injection control system, the temperature data fed back to the analysis module by the temperature measurement module is calculated by a formula:
in the formula:
Tn-the temperature value at a point n of the temperature field, in units;
Thn-the measurement value of the infrared thermometer at a certain point n in the temperature field is measured in units;
in the formula:
As an improvement of the SNCR denitration accurate ammonia injection control system, the analysis module comprises a controller and a memory;
the controller controls the ammonia injection module to inject ammonia from an ammonia source to the target area according to the corresponding ammonia injection amount according to the corresponding relation of the real-time temperature value fed back by the temperature measurement module in the standard curve.
As an improvement of the SNCR denitration accurate ammonia injection control system, the established standard curve data is the data corresponding to the working load and the inlet NOXEstablished under concentration conditions.
Compared with the prior art, the invention has the beneficial effects that: according to the SNCR denitration accurate ammonia injection control system, the at least two infrared thermometers and the plurality of thermocouples are arranged, and the distribution modes of the infrared thermometers and the thermocouples are optimized, so that point measurement is upgraded to line and surface measurement, the accuracy of a measurement result is improved, the spatial distribution of a temperature field is formed, and the temperature change of a spray gun area is visually displayed in real time.
Meanwhile, real-time measurement data of the temperature field is used as an important parameter in the SNCR ammonia spraying control logic, and the ammonia spraying amount is automatically controlled by comparing the temperature distribution change. The control method improves the extensive control mode of the original SNCR, avoids the excessive ammonia spraying in the low-temperature area and the ineffective ammonia spraying in the high-temperature area, improves the accuracy of ammonia spraying control, improves the high efficiency of SNCR denitration, and achieves the optimal denitration effect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a block diagram of an embodiment of an SNCR denitration precision ammonia injection control system of the present invention;
FIG. 2 is a schematic diagram of the distribution mode of an infrared thermometer and a thermocouple in an embodiment of the SNCR denitration accurate ammonia injection control system of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 and 2, an embodiment of the present invention provides an SNCR denitration accurate ammonia injection control system, which includes: the ammonia source, spout ammonia module 1, temperature measurement module 2 and analysis module 3. In this embodiment, the application environment of the SNCR denitration accurate ammonia injection control system is a boiler.
Specifically, the upstream section of the target area is distributed with the parts of the thermocouples 22, the midstream section of the target area is distributed with at least two infrared thermometers 21, and the downstream section of the target area is distributed with the rest parts of the thermocouples 22.
In one embodiment, as shown in fig. 2, there are two infrared thermometers 21, and one infrared thermometer 21 is provided on each of the left and right sides of the midstream section. The number of the thermocouples 22 is 12, 6 thermocouples 22 are distributed on the upstream section of the target area, and the other 6 thermocouples 22 are distributed on the downstream section of the target area.
At this time, two thermocouples 22 are provided above, on the left and right sides of the upstream section of the target region, respectively, and two thermocouples 22 are provided above, on the left and right sides of the downstream section of the target region, respectively. Meanwhile, the thermocouples 22 of the upstream section are distributed on one section of the target area, and the thermocouples 22 of the downstream section are distributed on the other section of the target area.
As described above, the application environment of the SNCR denitration accurate ammonia injection control system is a boiler, and at this time, the upper, middle and downstream sections are the upper, middle and downstream sections of a boiler flue. Correspondingly, the left side and the right side are the left side wall surface and the right side wall surface of the flue, and the upper part is the upper wall surface of the flue.
In the temperature measurement module 2, the measurement result of the thermocouple 22 and the measurement result of the infrared thermometer 21 are complementarily calculated in the smoke temperature distribution. The temperature of the temperature field is divided by a space virtual point grid, the calculation formula of the temperature of a certain point is shown in formula 1 and formula 2, the temperature value measured by the thermocouple 22 and the temperature value measured by the infrared thermometer 21 is calculated to output real-time online temperature field 3D temperature measurement data, and the real-time temperature data is sent to a DCS control system of the boiler for visual display and participation in SNCR ammonia injection control.
Specifically, the temperature data fed back to the analysis module 3 by the temperature measurement module 2 is calculated by a formula:
in the formula:
Tn-the temperature value at a point n of the temperature field, in units;
Thn-the measurement value, in units, of the infrared thermometer 21 at a certain point n of the temperature field;
in the formula:
The analysis module 3 controls the ammonia injection module 1 to inject ammonia from the ammonia source to the target area based on the temperature data collected by the temperature measurement module 2.
In particular, the analysis module 3 comprises a controller and a memory. The controller controls the ammonia injection module 1 to inject ammonia from an ammonia source to a target area according to the corresponding ammonia injection amount according to the corresponding relation of the real-time temperature value fed back by the temperature measurement module 2 in the standard curve.
Considering the adverse effects of the flow rate of the flue gas in the boiler, the temperature distribution and the NOx distribution, the mixing effect of the flue gas and the reducing agent under different boiler load working conditions is poor. Standard curve data is established for the corresponding operating load and inlet NOX concentration conditions. Specifically, SNCR denitration performance evaluation and diagnosis tests are carried out through a test means, the tests are respectively carried out under the conditions of different boiler loads, inlet NOx concentrations and smoke temperatures of the boiler, the SNCR optimum spray gun input mode and the ammonia injection control strategy of the ammonia injection control level under the conditions of different boiler loads, inlet NOx concentrations and smoke temperatures are evaluated according to the test results, and the control strategies are incorporated into the SNCR ammonia injection control logic and optimized.
In addition, in the process of automatic operation of SNCR, the ammonia injection control system of this embodiment performs condition judgment according to the boiler load, the inlet NOx concentration, and the real-time value change of the SNCR ammonia injection zone temperature, and automatically switches to the ammonia injection control strategy under different conditions, thereby realizing adaptive automatic operation of ammonia injection.
The ammonia spraying module 1 comprises a spray gun, the spray gun is connected with an ammonia source through a pipeline, and the ammonia source is a container for storing ammonia. Wherein, the quantity of spray gun is one or more, and when the spray gun is a plurality of, the injection angle of a plurality of spray guns is the same or different. Therefore, the SNCR ammonia injection can be accurately measured along with the change of the boiler load and the temperature field to automatically control the switching of the spray guns at different positions and the adjustment and control of the ammonia injection amount of the operating spray guns.
In conclusion, the SNCR denitration accurate ammonia injection control system realizes upgrading from point measurement to line and surface measurement by arranging at least two infrared thermometers and a plurality of thermocouples and optimally configuring the distribution modes of the infrared thermometers and the thermocouples, improves the accuracy of the measurement result, forms the spatial distribution of a temperature field, and visually displays the temperature change of a spray gun area in real time.
Meanwhile, real-time measurement data of the temperature field is used as an important parameter in the SNCR ammonia spraying control logic, and the ammonia spraying amount is automatically controlled by comparing the temperature distribution change. The control method improves the extensive control mode of the original SNCR, avoids the excessive ammonia spraying in the low-temperature area and the ineffective ammonia spraying in the high-temperature area, improves the accuracy of ammonia spraying control, improves the high efficiency of SNCR denitration, and achieves the optimal denitration effect.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. The utility model provides an accurate ammonia control system that spouts of SNCR denitration which characterized in that, accurate ammonia control system that spouts of SNCR denitration includes: the ammonia source, the ammonia spraying module, the temperature measuring module and the analysis module;
the temperature measurement module is distributed in the target area, and the temperature measurement module includes: the ammonia injection system comprises at least two infrared thermometers and a plurality of thermocouples, wherein the parts of the thermocouples are distributed at the upstream section of a target area, the at least two infrared thermometers are distributed at the middle-upstream section of the target area, the rest parts of the thermocouples are distributed at the downstream section of the target area, and the analysis module controls the ammonia injection module to inject ammonia from an ammonia source to the target area based on temperature data collected by the temperature measurement module.
2. The SNCR denitration precision ammonia injection control system of claim 1, wherein the ammonia injection module comprises a spray gun, the spray gun is connected with the ammonia source through a pipeline, and the ammonia source is a container for storing ammonia.
3. The SNCR denitration precision ammonia injection control system of claim 2, wherein the number of the spray guns is one or more, and when the number of the spray guns is more, the spray angles of the spray guns are the same or different.
4. The SNCR denitration accurate ammonia injection control system according to claim 1, wherein there are two infrared thermometers, and one infrared thermometer is provided on each of the left and right sides of the midstream section.
5. The SNCR denitration precision ammonia injection control system of claim 1 or 4, wherein the number of thermocouples is 12, 6 thermocouples are distributed in an upstream section of the target area, and the remaining 6 thermocouples are distributed in a downstream section of the target area.
6. The SNCR denitration precision ammonia injection control system of claim 5, wherein two thermocouples are respectively arranged above, on the left side and on the right side of the upstream section of the target area, and two thermocouples are respectively arranged above, on the left side and on the right side of the downstream section of the target area.
7. The SNCR denitration precision ammonia injection control system of claim 6, wherein the thermocouples of the upstream section are distributed on one cross section of the target area, and the thermocouples of the downstream section are distributed on another cross section of the target area.
8. The SNCR denitration accurate ammonia injection control system of claim 1, wherein the temperature data fed back to the analysis module by the temperature measurement module is calculated by a formula:
in the formula:
Tn-the temperature value at a point n of the temperature field, in units;
Thn-the measurement value of the infrared thermometer at a certain point n in the temperature field is measured in units;
in the formula:
9. The SNCR denitration precision ammonia injection control system of claim 1, wherein the analysis module comprises a controller and a memory;
the controller controls the ammonia injection module to inject ammonia from an ammonia source to the target area according to the corresponding ammonia injection amount according to the corresponding relation of the real-time temperature value fed back by the temperature measurement module in the standard curve.
10. The SNCR denitration precision ammonia injection control system according to claim 9, wherein the established standard curve data is at corresponding workload and inlet NOXEstablished under concentration conditions.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5570328A (en) * | 1978-11-22 | 1980-05-27 | Babcock Hitachi Kk | Operation of denitrifier |
| CN104307347A (en) * | 2014-10-30 | 2015-01-28 | 上海泰欣环保工程有限公司 | Efficient SNCR point-to-point injection system |
| CN106693700A (en) * | 2017-01-20 | 2017-05-24 | 北京帕莫瑞科技有限公司 | Ammonia injection quantity control system and method |
| CN207035808U (en) * | 2017-07-26 | 2018-02-23 | 武汉中理环保科技有限公司 | A kind of rotary kiln with temperature measuring equipment |
| CN110652872A (en) * | 2019-11-18 | 2020-01-07 | 宜睿思环境科技(北京)有限公司 | Selective non-catalytic reduction denitration accurate injection device and denitration device |
-
2020
- 2020-06-28 CN CN202010596500.1A patent/CN111773896B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5570328A (en) * | 1978-11-22 | 1980-05-27 | Babcock Hitachi Kk | Operation of denitrifier |
| CN104307347A (en) * | 2014-10-30 | 2015-01-28 | 上海泰欣环保工程有限公司 | Efficient SNCR point-to-point injection system |
| CN106693700A (en) * | 2017-01-20 | 2017-05-24 | 北京帕莫瑞科技有限公司 | Ammonia injection quantity control system and method |
| CN207035808U (en) * | 2017-07-26 | 2018-02-23 | 武汉中理环保科技有限公司 | A kind of rotary kiln with temperature measuring equipment |
| CN110652872A (en) * | 2019-11-18 | 2020-01-07 | 宜睿思环境科技(北京)有限公司 | Selective non-catalytic reduction denitration accurate injection device and denitration device |
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