CN208340474U - A kind of nox staged control system of denitration - Google Patents
A kind of nox staged control system of denitration Download PDFInfo
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- CN208340474U CN208340474U CN201820650475.9U CN201820650475U CN208340474U CN 208340474 U CN208340474 U CN 208340474U CN 201820650475 U CN201820650475 U CN 201820650475U CN 208340474 U CN208340474 U CN 208340474U
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- ammonia
- regulating valve
- denitration
- escaping
- denitrating system
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Abstract
The utility model discloses a kind of nox staged control systems of denitration, it is related to denitrating flue gas control field, including the total quantity regulating device of ammonia, the side A ammonia regulating valve, the side B ammonia regulating valve, nitrogen oxides detection instrument, denitration controller, the side A the escaping of ammonia rate detection instrument, the side B the escaping of ammonia rate detection instrument and offset controller；The side A sample tap connects nitrogen oxides detection instrument with the side B sample tap, and nitrogen oxides detects instrument and connects denitration controller, denitration controller output action to the total quantity regulating device of ammonia；The outlet conduit of the side A denitrating system is equipped with the side A the escaping of ammonia rate and detects instrument, the outlet conduit of the side B denitrating system is equipped with the side B the escaping of ammonia rate and detects instrument, the side A the escaping of ammonia rate detects instrument and connects offset controller with the side B the escaping of ammonia rate detection instrument, and offset controller distinguishes output action to the side A ammonia regulating valve and the side B ammonia regulating valve.Utility model has the advantages that having simplified denitrating system, realize that economization sprays ammonia.
Description
Technical field
The utility model relates to denitrating flue gas control field more particularly to a kind of nox staged control systems of denitration.
Background technique
Denitrating flue gas is exactly the amount of nitrogen oxides reduced in flue gas, reaches discharge standard, and denitrating system passes through spray
Enter ammonia and reaction of nitrogen oxides plays effect to denitrating flue gas.When nitrous oxides concentration is reduced to certain value, to after
Continuous to reduce, required ammonia amount increases exponentially, and wherein most cannot all participate in reacting, these ammonias not only cause
The waste of cost, it is often more important that the ammonia of this part is easy to react with the other materials in flue gas to cause flue blockage, jeopardizes
Power plant units safety, it is therefore desirable to which nitrogen oxides control system is set.
At present the source of ammonia it is general there are two types of, it is another directly to be stored up by liquefied ammonia one is being come by urea by pyrolysis
Deposit tank.Since there are security risks for liquefied ammonia holding vessel, major part power plant uses the denitrating system of urea ammonia now.Due to
Design needs, and the flue gas that boiler generates is divided into two flues arranged side by side and respectively enters two air preheaters, then passes through air respectively
One flue of rear remittance such as preheater, desulphurization system is discharged from chimney.It is respectively equipped with denitrating system on two flues, urea is through warm
The ammonia generated after solution furnace pyrolysis respectively enters in two denitrating systems, and the pipeline that urea enters pyrolysis oven is equipped with ammonia total amount
Regulating device, ammonia enter two denitrating systems pipeline on be respectively equipped with ammonia regulating valve.
In current flue gas denitrification system, the control of nitrogen oxides is usually in each setting one in the outlet of two denitrating systems
A nitrogen oxides detects instrument, measures opening for the total quantity regulating device of mean control ammonia of nitrous oxides concentration according to two instrument
Degree, the change of caused spray ammonia flow, so that nitrous oxides concentration is controlled, and ammonia regulating valve is in fixed aperture, Ke Nengzao
Unbalanced at two sides denitration, control effect is poor.
Utility model content
The technical problem to be solved by the utility model is to provide in a kind of highest situation of the whole denitration efficiency of realization, reach
The nox staged control system of denitration required to nitrogen oxides control.
The utility model is to solve a kind of above-mentioned technical problem: nox staged control of denitration by the following technical programs
System processed, including the side A denitrating system, the side B denitrating system, ammonia gas generating device, the total quantity regulating device of ammonia, the side A ammonia are adjusted
Valve, the side B ammonia regulating valve, nitrogen oxides detection instrument, denitration controller, the side A the escaping of ammonia rate detect instrument, the side B the escaping of ammonia rate
Detect instrument and offset controller；
The outlet of ammonia gas generating device connects the anti-of the side A denitrating system with the side B ammonia pipeline by the side A ammonia pipeline respectively
Answer that device respectively sprays ammonia branch pipe and the reactor of the side B denitrating system respectively sprays ammonia branch pipe；Ammonia gas generating device is adjusted equipped with ammonia total amount
Device, for adjusting the ammonia total amount for entering the side A denitrating system and the side B denitrating system by ammonia gas generating device；The side A ammonia pipeline
With the side A ammonia regulating valve and the side B ammonia regulating valve are respectively equipped on the ammonia pipeline of the side B；
The outlet conduit of the side A denitrating system is equipped with the side A sample tap, and it is side-draw that the outlet conduit of the side B denitrating system is equipped with B
Sample mouth, the side A sample tap and the side B sample tap pass through the side A sampling pipe respectively and connect nitrogen oxides detector with the side B sampling pipe
Table, nitrogen oxides detection instrument output signal to denitration controller, denitration controller output signal to the total quantity regulating device of ammonia；
The side A the escaping of ammonia rate detection instrument, the outlet of the side B denitrating system are additionally provided on the outlet conduit of the side A denitrating system
The escaping of ammonia rate detection instrument in the side B is additionally provided on road, the side A the escaping of ammonia rate detects instrument and connects partially with the side B the escaping of ammonia rate detection instrument
Controller is set, offset controller outputs signal to the side A ammonia regulating valve and the side B ammonia regulating valve respectively.
As the technical solution of optimization, the side A sampling pipe is equipped with the side A sampling valve, and it is side-draw that the side B sampling pipe is equipped with B
Sample valve.When certain side denitration purging, the sampling valve of the side is closed, avoids impacting nitrogen oxides detection limit.
As the technical solution of optimization, the ammonia gas generating device uses pyrolysis oven, and the inlet duct of pyrolysis oven is equipped with
Urea regulating valve is as the total quantity regulating device of the ammonia.
As the technical solution of optimization, the urea regulating valve is one or more, and each urea regulating valve receives de- simultaneously
The signal of nitre controller output, each urea regulating valve is same to be opened with pass.
As the technical solution of optimization, which further includes urea regulating valve manual operator, and denitration controller output signal is extremely
Urea regulating valve manual operator, urea regulating valve manual operator output signal to urea regulating valve.Urea regulating valve manual operator can be with hand
It is dynamic to automatically switch.
As the technical solution of optimization, which further includes the side A ammonia regulating valve manual operator and the side B ammonia regulating valve hand behaviour
Device, offset controller output signal to the side A ammonia regulating valve manual operator and the side B ammonia regulating valve manual operator, the side A ammonia tune respectively
Section valve manual operator and the side B ammonia regulating valve manual operator output signal to the side A ammonia regulating valve and the side B ammonia regulating valve respectively.The side A
Ammonia regulating valve manual operator and the side B ammonia regulating valve manual operator can automatically switch manually, and when being in automatic mode, the side A is in original
Have on instruction basis plus offset controller output, the side B subtract offset controller output on original instruction basis.
Utility model has the advantages that improving the automatic control level of system, keep the two sides of flue gas denitrification system de-
Nitre is balanced, final to realize in the highest situation of whole denitration efficiency, reaches the control requirement of nitrogen oxides, has simplified denitrating system
Device.
Detailed description of the invention
Fig. 1 is the block diagram of the nox staged control system of the utility model denitration.
Specific embodiment
As shown in Figure 1, a kind of nox staged control system of denitration, including the side A denitrating system, the side A air preheater,
The side B denitrating system, the side B air preheater, ammonia gas generating device, the total quantity regulating device of ammonia, the side A ammonia pipeline, the side B ammonia pipe
Road, the side A ammonia regulating valve, the side B ammonia regulating valve, the side A sample tap, the side A sampling pipe, the side A sampling valve, the side B sample tap, the side B
Sampling pipe, the side B sampling valve, nitrogen oxides detection instrument, denitration controller, urea regulating valve manual operator, the inspection of the side A the escaping of ammonia rate
Survey instrument, the side B the escaping of ammonia rate detection instrument, offset controller, the side A ammonia regulating valve manual operator and the side B ammonia regulating valve hand behaviour
Device.
The outlet conduit of the side A denitrating system connects the side A air preheater, and the outlet conduit connection side B of the side B denitrating system is empty
Air preheater；Ammonia gas generating device uses pyrolysis oven, and the outlet of pyrolysis oven passes through the side A ammonia pipeline and the side B ammonia pipeline respectively
Connect each spray ammonia branch pipe of the side A denitrating system and each spray ammonia branch pipe of the side B denitrating system；The inlet duct of pyrolysis oven is equipped with urine
Plain regulating valve enters the side A denitrating system and the side B denitration system by ammonia gas generating device as the total quantity regulating device of ammonia, for adjusting
The ammonia total amount of system；The side A ammonia regulating valve and the side B ammonia regulating valve are respectively equipped on the side A ammonia pipeline and the side B ammonia pipeline.
Urea regulating valve is one or more, and each urea regulating valve receives the signal of denitration controller output simultaneously, each to urinate
Plain regulating valve is same to be opened with pass.
The outlet conduit of the side A denitrating system is equipped with the side A sample tap, and it is side-draw that the outlet conduit of the side B denitrating system is equipped with B
Sample mouth, the side A sample tap and the side B sample tap pass through the side A sampling pipe respectively and connect nitrogen oxides detector with the side B sampling pipe
Table, nitrogen oxides detection instrument output signal to denitration controller, denitration controller output signal to urea regulating valve manual operator,
Urea regulating valve manual operator outputs signal to urea regulating valve, and the side A sampling pipe is equipped with the side A sampling valve, on the sampling pipe of the side B
Equipped with the side B sampling valve.
The side A the escaping of ammonia rate detection instrument, the outlet of the side B denitrating system are additionally provided on the outlet conduit of the side A denitrating system
The escaping of ammonia rate detection instrument in the side B is additionally provided on road, the side A the escaping of ammonia rate detects instrument and the side B the escaping of ammonia rate detection instrument output letter
Number to offset controller, offset controller outputs signal to the side A ammonia regulating valve manual operator and the side B ammonia regulating valve hand behaviour respectively
Device, the side A ammonia regulating valve manual operator and the side B ammonia regulating valve manual operator output signal to the side A ammonia regulating valve and the side B ammonia respectively
Gas regulating valve.
System point two sides arrange that the flue gas that boiler combustion generates respectively enters the side A denitrating system and the side B denitrating system, urinate
The ammonia that element is pyrolyzed generation in pyrolysis oven enters the side A denitrating system and the side B by the side A ammonia pipeline and the side B ammonia pipeline respectively
Denitrating system reacts with the nitrogen oxides in flue gas, distinguishes through the side A denitrating system and the side B denitrating system treated flue gas
Into the side A air preheater and the side B air preheater.
The flue gas of the side A sample tap enters nitrogen oxides detection instrument by the side A sampling pipe, and the flue gas of the side B sample tap is by the side B
Sampling pipe enters nitrogen oxides detection instrument, after the flue gas mixing of two sides, obtains two sides through nitrogen oxides detection instrumental analysis
The nitrous oxides concentration of flue gas entirety.Denitration controller calculates control amount according to the nitrous oxides concentration of two sides flue gas entirety,
Then it by control amount and exports to urea regulating valve manual operator.Urea regulating valve manual operator issues the instruction of urea regulating valve, urea
Regulating valve adjusts the urea amount for entering pyrolysis oven by the instruction of received urea regulating valve, to change into the side A denitrating system
With the ammonia total amount of the side B denitrating system.
The side A the escaping of ammonia rate detects instrument and the side B the escaping of ammonia rate detection instrument for detecting the side A denitrating system and the side B respectively
The escaping of ammonia rate of denitrating system.Offset controller calculates bias according to the escaping of ammonia rate of two sides, when the ammonia of the side A denitrating system is escaped
When ease rate is greater than the escaping of ammonia rate of the side B denitrating system, bias takes positive value, otherwise bias takes negative value.Offset controller will be inclined
It sets value to be exported respectively to the side A ammonia regulating valve manual operator and the side B ammonia regulating valve manual operator, the side A ammonia regulating valve manual operator exists
On original instruction basis plus bias, the side B ammonia regulating valve manual operator subtract bias on original instruction basis, generate regulating valve
Instruction, exports respectively to the side A ammonia regulating valve and the side B ammonia regulating valve.The side A ammonia regulating valve and the side B ammonia regulating valve pass through
Respectively received regulating valve instruction adjusts the ammonia amount for entering the side A ammonia pipeline and the side B ammonia pipeline respectively.
The course of work of the multi-level control system are as follows:
The Con trolling index of nitrogen oxides is arranged according to service requirement in the first step, according to the nitrogen oxides of two sides flue gas entirety
Concentration controls the due aperture of urea regulating valve, when whole nitrous oxides concentration is higher than Con trolling index, opens big urea and adjusts
Valve.
Second step, it is more that the escaping of ammonia rate height of two sides flue gas wherein side illustrates that the side ammonia sprays into, and there are certain waves
Take, the proportion of the side A ammonia regulating valve and the side B ammonia regulating valve is adjusted by offset controller, realizes the escaping of ammonia of two sides flue gas
The balance of rate.
After the adjustment of second step, in the case where same ammonia amount, the ammonia nitrogen due to balancing two sides reacts, whole
Efficiency is improved, and whole amino-oxide concentration reduces.
The first step and second step circulate operation, circulation said herein are really dynamic process, without obvious temporal area
Point.
For example, the Con trolling index of nitrogen oxides is 50mg/m3, by adjusting urea regulating valve, at present nitrogen in denitration flue gas
The overall density of oxide reaches 50mg/m3, but two sides denitration is unbalanced, there is the phenomenon that spray in the side B, then the denitration of the side A
High-efficient, the side B denitration efficiency is low, and what is reflected is that the escaping of ammonia rate of the side B can obviously be higher than the escaping of ammonia rate of the side A, at this moment urinates
Plain flow may be 60t/h.
Two sides are represented so that the escaping of ammonia rate of two sides is identical by adjusting the side A ammonia regulating valve and the side B ammonia regulating valve
Denitration efficiency it is identical, when being reduced to certain value due to nitrous oxides concentration, to continue to reduce, required ammonia amount will be at
Index increases, and wherein most cannot all participate in reacting, so at this moment whole denitration efficiency is to improve, nitrogen in denitration flue gas
The overall density of oxide can achieve 45mg/m3, urea regulating valve at this moment can be turned down, when denitration nitrogen oxides in effluent
Overall density reach 50mg/m3, urea flow may only have 50t/h.
The above is only the preferred embodiment of the present invention, is not intended to limit the utility model, all practical at this
Made any modifications, equivalent replacements, and improvements etc., should be included in the guarantor of the utility model within novel spirit and principle
Within the scope of shield.
Claims (6)
1. a kind of nox staged control system of denitration, it is characterised in that: including the side A denitrating system, the side B denitrating system, ammonia
The total quantity regulating device of gas generating device, ammonia, the side A ammonia regulating valve, the side B ammonia regulating valve, nitrogen oxides detect instrument, denitration
Controller, the side A the escaping of ammonia rate detection instrument, the side B the escaping of ammonia rate detection instrument and offset controller；
The outlet of ammonia gas generating device connects the reactor of the side A denitrating system by the side A ammonia pipeline with the side B ammonia pipeline respectively
The reactor of each spray ammonia branch pipe and the side B denitrating system respectively sprays ammonia branch pipe；Ammonia gas generating device is equipped with the total quantity regulating device of ammonia,
For adjusting the ammonia total amount for entering the side A denitrating system and the side B denitrating system by ammonia gas generating device；The side A ammonia pipeline and the side B
The side A ammonia regulating valve and the side B ammonia regulating valve are respectively equipped on ammonia pipeline；
The outlet conduit of the side A denitrating system is equipped with the side A sample tap, and the outlet conduit of the side B denitrating system is equipped with B sample side-draw
Mouthful, the side A sample tap passes through the side A sampling pipe with the side B sample tap respectively and connects nitrogen oxides detection instrument with the side B sampling pipe,
Nitrogen oxides detection instrument outputs signal to denitration controller, denitration controller output signal to the total quantity regulating device of ammonia；
The escaping of ammonia rate detection instrument in the side A is additionally provided on the outlet conduit of the side A denitrating system, on the outlet conduit of the side B denitrating system
It is additionally provided with the side B the escaping of ammonia rate detection instrument, the side A the escaping of ammonia rate detects instrument and connects biasing control with the side B the escaping of ammonia rate detection instrument
Device processed, offset controller output signal to the side A ammonia regulating valve and the side B ammonia regulating valve respectively.
2. the nox staged control system of denitration as described in claim 1, it is characterised in that: the side A sampling pipe is equipped with A
Side sampling valve, the side B sampling pipe are equipped with the side B sampling valve.
3. the nox staged control system of denitration as described in claim 1, it is characterised in that: the ammonia gas generating device is adopted
With pyrolysis oven, the inlet duct of pyrolysis oven is equipped with urea regulating valve as the total quantity regulating device of the ammonia.
4. the nox staged control system of denitration as claimed in claim 3, it is characterised in that: the urea regulating valve is one
A or multiple, each urea regulating valve receives the signal of denitration controller output simultaneously, and each urea regulating valve is same to be opened with pass.
5. the nox staged control system of denitration as claimed in claim 3, it is characterised in that: the system further includes urea tune
Valve manual operator, denitration controller output signal to urea regulating valve manual operator are saved, urea regulating valve manual operator outputs signal to urine
Plain regulating valve.
6. the nox staged control system of denitration as described in claim 1, it is characterised in that: the system further includes the side A ammonia
Gas regulating valve manual operator and the side B ammonia regulating valve manual operator, offset controller output signal to the side A ammonia regulating valve hand behaviour respectively
Device and the side B ammonia regulating valve manual operator, the side A ammonia regulating valve manual operator and the side B ammonia regulating valve manual operator distinguish output signal
To the side A ammonia regulating valve and the side B ammonia regulating valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201820650475.9U CN208340474U (en) | 2018-05-03 | 2018-05-03 | A kind of nox staged control system of denitration |
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| CN201820650475.9U CN208340474U (en) | 2018-05-03 | 2018-05-03 | A kind of nox staged control system of denitration |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109821393A (en) * | 2019-04-08 | 2019-05-31 | 福建省锅炉压力容器检验研究院 | CFB boiler based on wet absorption mixes tail portion flue gas purifying technique after burning sawdust sludge |
| CN112461995A (en) * | 2020-11-03 | 2021-03-09 | 西安热工研究院有限公司 | Method for predicting ammonia escape of thermal power plant |
-
2018
- 2018-05-03 CN CN201820650475.9U patent/CN208340474U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109821393A (en) * | 2019-04-08 | 2019-05-31 | 福建省锅炉压力容器检验研究院 | CFB boiler based on wet absorption mixes tail portion flue gas purifying technique after burning sawdust sludge |
| CN112461995A (en) * | 2020-11-03 | 2021-03-09 | 西安热工研究院有限公司 | Method for predicting ammonia escape of thermal power plant |
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| 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: 20190108 Termination date: 20200503 |