CN205659558U - Urea pyrolysis denitration measurement distribution system - Google Patents
Urea pyrolysis denitration measurement distribution system Download PDFInfo
- Publication number
- CN205659558U CN205659558U CN201620315139.XU CN201620315139U CN205659558U CN 205659558 U CN205659558 U CN 205659558U CN 201620315139 U CN201620315139 U CN 201620315139U CN 205659558 U CN205659558 U CN 205659558U
- Authority
- CN
- China
- Prior art keywords
- denitration
- urea
- valve
- solution
- control valve
- Prior art date
- 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.)
- Expired - Fee Related
Links
Landscapes
- Treating Waste Gases (AREA)
Abstract
The utility model relates to a thermal power station flue gas denitration pipeline system. An urea pyrolysis denitration measurement distribution system, includes the urea solution system, the solution import department of urea solution system is equipped with main regulator valve and flowmeter A in proper order, the solution exit is equipped with flowmeter B. An urea pyrolysis denitration measurement distribution system, through will set up the ureal governing valve setting of each branch's spray gun being responsible for the section, effectively realized control and measurement to the flow degree of accuracy, avoided the phenomenon of solution crystallization in the small pipeline, guarantee to adjust the quality, reduced the extent of corrosion of ammonia escape rate to the follow -up flue gas system equipment of boiler denitration, improved the operational reliability of system, the utility model discloses simple structure, the practicality is strong.
Description
Technical field
This utility model relates to a kind of heat power station denitrating flue gas pipeline system.
Background technology
In order to effectively remove the NO in flue gasX Reducing the pollution to environment, current large-scale thermal power machine group all uses cigarette
Gas denitration technology.The raw material of preparing of selective catalytic reduction (SCR) denitration reducing agent ammonia mainly has liquefied ammonia, ammonia and urine
Element three kinds.Based on security consideration, urea pyrolysis denitration technology is generally used.Pyrolysis denitration technology technological process at present is:
First carbamide is put into dissolving tank, use demineralized water mixed dissolution, and make a certain proportion of urea liquid, then distributed by metering
System and compressed air atomization system spray in pyrolysis oven, and wherein the dilution wind in pyrolysis oven exports heat primary air from air preheater
Pipe, dilution wind is after electric heater heats in feeding pyrolysis oven, and the urea liquid in pyrolysis oven at high temperature carries out decomposing producing
Raw NH3And CO2, eventually pass ammonia-spraying grid and enter the NO in boiler back end ductwork and flue gasXIt is sufficiently mixed, at catalyst
The lower reaction of effect generates N2And H2O also enters air.
Existing urea pyrolysis denitration technology in measure distribution system generally comprise: main leg's system electrodynamic valve, bypass electronic
Valve and recirculation electrodynamic valve；Each manually operated door, Electrically operated gate, non-return valve, regulation valve, gun traffic.It is installed in its respective branch
On spray gun pipeline section, but owing to urea pyrolysis denitration technology is to urea liquid total amount and the high request of atomizing effect, cause reality
Process system Zhong Ge branch spray gun pipeline section diameter is generally 15mm～20mm, and install on the most tiny pipeline section regulation valve and
Flow measurement device, requires high to equipment and mounting process, but but there are problems in practical work process:
1, each branch spray gun pipeline section diameter is less, causes each branch spray gun regulation valve dead band big, owing to the dead band of valve is big,
Cause respective branches urea liquid flow Spline smoothing big.
2, each branch spray gun urea liquid flow measurement error more greatly, the poorest, cause control system accurately to calculate
Enter total carbamide flow of pyrolysis oven.
3, unit denitration closed-loop control system regulation quality is based on each branch spray gun urea liquid regulation valve precision, each spray gun
Regulation valve action together regulation dead band superposition, total urea liquid flow Spline smoothing amount is big (about rated capacity 10%), causes denitration
Closed-loop control system cannot automatically engage.The most all try one's best spray carbamide more for meeting environmental protection index requirement operations staff, cause urine
While element waste, add system the escaping of ammonia rate, have a strong impact on the safety that boiler smoke system follow-up equipment runs.
4, little due to each branch spray gun pipeline section diameter, and regulation valve, flow measurement device are installed, in causing each spray gun tube wall
Urea liquid crystallizes, and causes pipeline blockage, reduces denitrating system operation stability.
5, each branch spray gun pipeline section installs large number quipments, and not only initial investment is big, and adds substantial amounts of regular maintenance
Work.
Summary of the invention
The utility model proposes a kind of urea pyrolysis denitration metering distribution system that can accurately control urea liquid flow.
A kind of urea pyrolysis denitration metering distribution system described in the utility model, including urea liquid system, its feature exists
At the solution inlet port of described urea liquid system, it is sequentially provided with main inlet control valve and effusion meter A, at described taphole, is provided with stream
Gauge B.
Preferably, secondary regulation valve, described main inlet control valve and secondary tune it are additionally provided with at the solution inlet port of described urea liquid system
Joint valve is parallel with one another.
Preferably, at the solution inlet port of described main inlet control valve, it is provided with Electrically operated gate before main inlet control valve, the solution of main inlet control valve
Exit is provided with Electrically operated gate after main inlet control valve.
It is further preferred that be provided with Electrically operated gate before secondary regulation valve at the solution inlet port of described secondary regulation valve, secondary regulation valve
Electrically operated gate after secondary regulation valve it is provided with at taphole.
A kind of urea pyrolysis denitration metering distribution system described in the utility model, by being arranged on each branch spray gun carbamide
Regulation valve be arranged on main leg, effectively achieve the control to flow accuracy and measurement, it is to avoid solution knot in small pipeline
Brilliant phenomenon, it is ensured that regulation quality, decreases the extent of corrosion of the escaping of ammonia rate flue gas system follow-up to Denitration in Boiler equipment, improves
System operation reliability, this utility model simple in construction, practical.
Accompanying drawing explanation
Fig. 1 is attachment structure schematic diagram of the present utility model.
In figure: 1-main inlet control valve；2-pair regulation valve；3-effusion meter A3；4-effusion meter B4；Electrically operated gate 5 before 5-main inlet control valve；
Electrically operated gate after 6-main inlet control valve；Electrically operated gate before 7-pair regulation valve；Electrically operated gate 8 after 8-pair regulation valve.
Detailed description of the invention
Embodiment 1.
A kind of urea pyrolysis denitration metering distribution system described in the utility model, including urea liquid system, described carbamide
It is sequentially provided with main inlet control valve 1 and effusion meter A3 at the solution inlet port of solution system, at described taphole, is provided with effusion meter B4.Institute
Stating and be additionally provided with secondary regulation valve 2 at the solution inlet port of urea liquid system, described main inlet control valve 1 and secondary regulation valve 2 are parallel with one another, this
Electrically operated gate 5 before main inlet control valve it is provided with, at the taphole of main inlet control valve 1 at the solution inlet port of main inlet control valve 1 described in utility model
It is provided with Electrically operated gate 6 after main inlet control valve；Electrically operated gate 7 before secondary regulation valve, secondary regulation valve it is provided with at the solution inlet port of described secondary regulation valve 2
Electrically operated gate 8 after secondary regulation valve it is provided with at the taphole of 2.
When urea pyrolysis denitration metering distribution system is properly functioning, Electrically operated gate after Electrically operated gate 5, main inlet control valve before main inlet control valve
6 are in open mode, and before closedown pair regulation valve, Electrically operated gate 7 and pair regulate Electrically operated gate 8 after valve, adjust denitration by main inlet control valve 1
Urea liquid flow, it is ensured that denitration exit NOx concentration is in claimed range.When main inlet control valve 1 fault, before closing main inlet control valve
After Electrically operated gate 5, main inlet control valve, it is overhauled by Electrically operated gate 6；Before opening secondary regulation valve, Electrically operated gate 7 and pair regulate electricity after valve simultaneously
Dynamic door 8, adjusts denitration urea liquid flow by pair regulation valve 2, it is ensured that denitration exit NOx concentration is in claimed range.Work as urine
When element pyrolysis denitration metering distribution system exits, electronic after Electrically operated gate 5, main inlet control valve before closedown main inlet control valve 1 and main inlet control valve
Electrically operated gate 8 after Electrically operated gate 7 and secondary regulation valve before door 6, secondary regulation valve 2 and secondary regulation valve.This utility model by effusion meter A3 and
Effusion meter B4 calculate place flow number.
Claims (4)
1. a urea pyrolysis denitration metering distribution system, including urea liquid system, it is characterised in that described urea liquid system
It is sequentially provided with main inlet control valve (1) and effusion meter A(3 at the solution inlet port of system), set at the taphole of described urea liquid system
There is effusion meter B(4).
2. a kind of urea pyrolysis denitration metering distribution system, it is characterised in that described urea liquid system
Solution inlet port at be additionally provided with secondary regulation valve (2), described main inlet control valve (1) and secondary to regulate valve (2) parallel with one another.
3. a kind of urea pyrolysis denitration metering distribution system, it is characterised in that described main inlet control valve (1)
It is provided with Electrically operated gate (5) before main inlet control valve at solution inlet port, at the taphole of main inlet control valve (1), is provided with Electrically operated gate after main inlet control valve
(6).
4. a kind of urea pyrolysis denitration metering distribution system as described in Claims 2 or 3, it is characterised in that described secondary regulation valve
(2) Electrically operated gate (7) before secondary regulation valve it is provided with at solution inlet port, electronic after being provided with secondary regulation valve at the taphole of secondary regulation valve
Door (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620315139.XU CN205659558U (en) | 2016-04-15 | 2016-04-15 | Urea pyrolysis denitration measurement distribution system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620315139.XU CN205659558U (en) | 2016-04-15 | 2016-04-15 | Urea pyrolysis denitration measurement distribution system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205659558U true CN205659558U (en) | 2016-10-26 |
Family
ID=57164121
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620315139.XU Expired - Fee Related CN205659558U (en) | 2016-04-15 | 2016-04-15 | Urea pyrolysis denitration measurement distribution system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205659558U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111229039A (en) * | 2020-03-16 | 2020-06-05 | 西安西热锅炉环保工程有限公司 | Arrange inside urea of combustion engine export flue and directly spout pyrolysis denitrification facility |
| CN112169593A (en) * | 2020-11-10 | 2021-01-05 | 西安热工研究院有限公司 | Accurate pyrolysis device that directly spouts suitable for combustion engine SCR denitration |
-
2016
- 2016-04-15 CN CN201620315139.XU patent/CN205659558U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111229039A (en) * | 2020-03-16 | 2020-06-05 | 西安西热锅炉环保工程有限公司 | Arrange inside urea of combustion engine export flue and directly spout pyrolysis denitrification facility |
| WO2021184786A1 (en) * | 2020-03-16 | 2021-09-23 | 西安热工研究院有限公司 | Urea direct-injection pyrolysis denitrification device arranged inside outlet flue duct of gas turbine |
| CN112169593A (en) * | 2020-11-10 | 2021-01-05 | 西安热工研究院有限公司 | Accurate pyrolysis device that directly spouts suitable for combustion engine SCR denitration |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104226110B (en) | Coal-fired boiler SCR (Selective Catalytic Reduction) denitration control method and system | |
| CN103728994B (en) | A kind of cement plant SCR denitration efficiency monitoring control method | |
| CN205461808U (en) | SCR denitration catalyst on -line measuring with spout ammonia and optimize automatic regulating system | |
| CN105045089A (en) | Boiler denitration control method based on outlet NOx content control and system thereof | |
| CN204134478U (en) | Switch protecting type boiler smoke SCR denitration system | |
| CN205235766U (en) | Automatic control SCR flue gas denitration urea pyrolysis system | |
| CN205659558U (en) | Urea pyrolysis denitration measurement distribution system | |
| CN203517748U (en) | Temperature controllable coal economizer | |
| CN106621738A (en) | Control device for reducing escaped ammonia in denitration process | |
| CN107670474B (en) | SNCR (selective non-catalytic reduction) denitration system control device and denitration control method | |
| CN204369580U (en) | A kind of urea pyrolysis ammonia system | |
| CN208465627U (en) | A kind of SCR denitration system spray ammonia control device | |
| CN105222114A (en) | The low NO of economizer sectional boiler full load xdevice and remodeling method | |
| CN208097812U (en) | A kind of equipment for denitrifying flue gas | |
| CN204307526U (en) | For the mixed cigarette thermoregulating system of boiler SCR denitration system | |
| CN208527026U (en) | A kind of ammonia-spraying grid nozzle with anti-blocking flow equalizing function | |
| CN209476006U (en) | A kind of NOx subregion patrols survey dynamic spray ammonia balance control system | |
| CN106955592A (en) | The urea pyrolysis ammonia structures and methods of SCR denitration system sulfur dioxide/sulphur trioxide conversion rate can be reduced | |
| CN103962006B (en) | A kind of spray ammonia uniformity adjusting method of SCR flue gas denitrification system | |
| CN205151792U (en) | Urea hydrolysis reactor control system | |
| CN214151507U (en) | Structure for rapidly measuring and feedback-controlling SCR ammonia injection amount based on concentration of NOx at outlet of induced draft fan | |
| CN214106467U (en) | Ammonia gas flow regulating device and denitration system | |
| CN212651632U (en) | Flue gas denitration system for diluting ammonia gas by desulfurized flue gas | |
| CN207756012U (en) | Air heated type ammonia sky mixing arrangement | |
| CN108607358A (en) | A kind of full load denitrification apparatus having urea smoke gas pyrolysis function |
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 |
Granted publication date: 20161026 Termination date: 20190415 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |