CN112506237A - Control method for automatically adjusting urea flow distribution of single urea spray gun - Google Patents
Control method for automatically adjusting urea flow distribution of single urea spray gun Download PDFInfo
- Publication number
- CN112506237A CN112506237A CN202011241948.8A CN202011241948A CN112506237A CN 112506237 A CN112506237 A CN 112506237A CN 202011241948 A CN202011241948 A CN 202011241948A CN 112506237 A CN112506237 A CN 112506237A
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- China
- Prior art keywords
- urea
- spray gun
- flow
- urea flow
- difference value
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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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Links
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 101
- 239000004202 carbamide Substances 0.000 title claims abstract description 101
- 239000007921 spray Substances 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 10
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D7/00—Control of flow
- G05D7/06—Control of flow characterised by the use of electric means
- G05D7/0617—Control of flow characterised by the use of electric means specially adapted for fluid materials
- G05D7/0629—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B11/00—Automatic controllers
- G05B11/01—Automatic controllers electric
- G05B11/36—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential
- G05B11/42—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential for obtaining a characteristic which is both proportional and time-dependent, e.g. P.I., P.I.D.
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B13/00—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion
- G05B13/02—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric
- G05B13/04—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators
- G05B13/042—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators in which a parameter or coefficient is automatically adjusted to optimise the performance
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D11/00—Control of flow ratio
- G05D11/02—Controlling ratio of two or more flows of fluid or fluent material
- G05D11/13—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means
- G05D11/131—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means by measuring the values related to the quantity of the individual components
- G05D11/132—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means by measuring the values related to the quantity of the individual components by controlling the flow of the individual components
Abstract
The invention discloses a control method for automatically adjusting urea flow distribution of a single urea spray gun. The actual denitration total urea flow is subtracted from the denitration total urea flow to calculate the difference value of the current required total urea flow, then the difference value is multiplied by a coefficient corresponding to the number of the urea spray guns in an automatic input state to calculate the difference value of the required urea flow of the single urea spray gun, the difference value of the required urea flow of the single urea spray gun is eliminated through PID calculation, the urea flow of the single urea spray gun is made to reach a target value, the urea flow of the single urea spray gun is output, and the problem of total urea flow disturbance when the urea spray gun is put on or off is effectively eliminated through the control method.
Description
Technical Field
The invention relates to an automatic regulation and control system for denitration of a thermal power plant, and belongs to the field of automatic regulation and control strategies and parameter optimization for denitration of the thermal power plant.
Background
The No. 1 unit of our company is a 600MW subcritical steam drum furnace, the emission standard of flue gas conforms to the emission standard of atmospheric pollutants of thermal power plants (GB13223-2011), and the emission value of nitrogen oxides cannot exceed 50mg/m3. The No. 1 unit of our company has 8 urea spray guns, and each urea spray gun has an upper flow limit and a lower flow limit. Therefore, when the load and the coal quantity of the unit change, the urea spray gun needs to be timely thrown and withdrawn.
In the original denitration automatic control logic, the urea spray gun input count is judged, the coefficient conversion is carried out on the urea spray gun input count, the converted coefficient is multiplied by a total urea flow instruction, and the total urea flow is averagely distributed to all the input urea spray guns.
However, in the actual operation of the unit, we have found that the above control scheme has drawbacks: 1. in the single spray gun urea flow distribution control logic, the urea spray guns which are not put into operation automatically are not removed. 2. When the number of the added urea spray guns changes, the conversion coefficient changes in a step-like manner, so that the urea flow of each urea spray gun is disturbed, the total urea flow is disturbed, the nitrogen oxide is fluctuated, and the nitrogen oxide emission is extremely easy to exceed the standard.
Aiming at the problems, professional technicians of the company continuously observe and analyze denitration automatic adjustment curves to research and design a set of denitration automatic adjustment single urea spray gun urea flow distribution control method.
Disclosure of Invention
The invention aims to provide a control method for automatically adjusting urea flow distribution of a single urea spray gun, which distributes the urea flow of the single urea spray gun through PID control and eliminates total urea flow disturbance caused by switching on and off the urea spray gun.
The technical scheme of the invention is as follows: a control method for automatically regulating urea flow distribution of a single urea spray gun is characterized in that denitration actual total urea flow is subtracted from denitration total urea flow, a difference value of current required total urea flow is calculated, then a coefficient corresponding to the number of urea spray guns put into an automatic state is multiplied, the difference value of the required urea flow of the single urea spray gun is calculated, and the difference value of the required urea flow of the single urea spray gun is eliminated through PID calculation, so that the urea flow of the single urea spray gun reaches a target value, and the urea flow of the single urea spray gun is output.
Drawings
FIG. 1 is a logic diagram of the urea flow distribution control of the self-regulating single urea injection lance of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples of the present invention without any inventive step, are within the scope of the present invention.
In the denitration link of the thermal power generating unit, a plurality of urea spray guns participate in the work, and each urea spray gun has the upper limit of flow and the lower limit of flow, so that the urea spray guns need to be put in and taken out in time when the load and the coal quantity of the unit change. By the control method, the problem of disturbance of the total urea flow when the urea spray gun is thrown in or withdrawn is solved.
As shown in fig. 1, several intermediate points therein represent the following:
UREAFLOW represents the denitration total urea flow command;
REAL UREAFLOW represents the actual total urea flow for denitration;
UREAAUTONUM represents the number of urea spray guns put into an automatic state;
SINGLE urea flow SP represents a set value of a urea flow instruction difference value of a SINGLE urea spray gun, and the set value is 0;
SINGLE SCR SP represents a single urea lance urea flow command;
subtracting the actual total urea flow for REAL UREAFLOW denitration from the UREAFLOW denitration total urea flow instruction, and calculating the difference value of the current required total urea flow.
And then multiplying the urea flow rate by a coefficient corresponding to the number of the urea spray guns in the automatic urea spraying gun throwing state to calculate the difference value of the urea flow rate required by the single urea spray gun. And finally, eliminating the difference of the urea flow required by the single urea spray gun through PID calculation, and outputting SINGLE SCR SP urea flow instructions of the single urea spray gun. By the control method, the problem of disturbance of the total urea flow when the urea spray gun is put on or off is effectively solved.
The corresponding coefficient function of the number of urea spray guns in the automatic state is shown in table 1:
the above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are intended to be covered by the scope of the present invention.
Claims (1)
1. A control method for automatically adjusting urea flow distribution of a single urea spray gun is characterized in that denitration actual total urea flow is subtracted from denitration total urea flow, a difference value of current required total urea flow is calculated, then a coefficient corresponding to the number of urea spray guns put into an automatic state is multiplied, the difference value of the required urea flow of the single urea spray gun is calculated, and then PID calculation is carried out to eliminate the difference value of the required urea flow of the single urea spray gun, so that the urea flow of the single urea spray gun reaches a target value, and the urea flow of the single urea spray gun is output;
function table of corresponding coefficient of number of urea spray gun in automatic state
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011241948.8A CN112506237A (en) | 2020-11-09 | 2020-11-09 | Control method for automatically adjusting urea flow distribution of single urea spray gun |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011241948.8A CN112506237A (en) | 2020-11-09 | 2020-11-09 | Control method for automatically adjusting urea flow distribution of single urea spray gun |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112506237A true CN112506237A (en) | 2021-03-16 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011241948.8A Withdrawn CN112506237A (en) | 2020-11-09 | 2020-11-09 | Control method for automatically adjusting urea flow distribution of single urea spray gun |
Country Status (1)
| Country | Link |
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| CN (1) | CN112506237A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20140046651A (en) * | 2012-10-09 | 2014-04-21 | 현대중공업 주식회사 | Urea injection device for scr reactor of large-size marine diesel engine and it's control method |
| KR20150062674A (en) * | 2013-11-29 | 2015-06-08 | 현대중공업 주식회사 | Apparatus and Method for Urea Injection Control in Selective Catalytic Reduction System |
| CN105797576A (en) * | 2016-04-15 | 2016-07-27 | 中国大唐集团科学技术研究院有限公司西北分公司 | Coal-fired unit denitration ammonia spraying control method |
| CN207462983U (en) * | 2017-11-15 | 2018-06-08 | 东方电气集团东方锅炉股份有限公司 | A kind of urea pyrolysis system of major-minor spray gun combined running |
| CN109464890A (en) * | 2018-10-24 | 2019-03-15 | 大唐陕西发电有限公司 | One kind being based on tandem variable element denitration autocontrol method |
| CN111111430A (en) * | 2019-12-19 | 2020-05-08 | 华电电力科学研究院有限公司 | SCR denitration regulation control method for urea pyrolysis furnace |
-
2020
- 2020-11-09 CN CN202011241948.8A patent/CN112506237A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20140046651A (en) * | 2012-10-09 | 2014-04-21 | 현대중공업 주식회사 | Urea injection device for scr reactor of large-size marine diesel engine and it's control method |
| KR20150062674A (en) * | 2013-11-29 | 2015-06-08 | 현대중공업 주식회사 | Apparatus and Method for Urea Injection Control in Selective Catalytic Reduction System |
| CN105797576A (en) * | 2016-04-15 | 2016-07-27 | 中国大唐集团科学技术研究院有限公司西北分公司 | Coal-fired unit denitration ammonia spraying control method |
| CN207462983U (en) * | 2017-11-15 | 2018-06-08 | 东方电气集团东方锅炉股份有限公司 | A kind of urea pyrolysis system of major-minor spray gun combined running |
| CN109464890A (en) * | 2018-10-24 | 2019-03-15 | 大唐陕西发电有限公司 | One kind being based on tandem variable element denitration autocontrol method |
| CN111111430A (en) * | 2019-12-19 | 2020-05-08 | 华电电力科学研究院有限公司 | SCR denitration regulation control method for urea pyrolysis furnace |
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| CB03 | Change of inventor or designer information |
Inventor after: Wei Boyuan Inventor after: Yang Damao Inventor after: Wang Yuxue Inventor after: Li Huijun Inventor after: Wang Zhuo Inventor after: Chen Dong Inventor after: Liu Lei Inventor after: Zhang Xuefeng Inventor after: Lv Shiwen Inventor before: Wei Boyuan Inventor before: Yang Damao Inventor before: Wang Yuxue Inventor before: Li Huijun Inventor before: Wang Zhuo Inventor before: Chen Dong Inventor before: Liu Lei Inventor before: Zhang Xuefeng Inventor before: Lv Shiwen |
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Application publication date: 20210316 |
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