CN114087603A - High-parameter industrial steam extraction double-valve combined control system with rear regulating valve - Google Patents
High-parameter industrial steam extraction double-valve combined control system with rear regulating valve Download PDFInfo
- Publication number
- CN114087603A CN114087603A CN202111350924.0A CN202111350924A CN114087603A CN 114087603 A CN114087603 A CN 114087603A CN 202111350924 A CN202111350924 A CN 202111350924A CN 114087603 A CN114087603 A CN 114087603A
- Authority
- CN
- China
- Prior art keywords
- steam extraction
- regulating valve
- valve
- temperature
- control system
- 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.)
- Pending
Links
- 238000000605 extraction Methods 0.000 title claims abstract description 87
- 230000001105 regulatory effect Effects 0.000 title claims abstract description 87
- 238000003303 reheating Methods 0.000 claims abstract description 16
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 15
- 238000005259 measurement Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 238000011144 upstream manufacturing Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G1/00—Steam superheating characterised by heating method
- F22G1/10—Steam superheating characterised by heating method with provision for superheating by throttling
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Turbines (AREA)
Abstract
The invention discloses a high-parameter industrial steam extraction double-valve combined control system with a postpositive regulating valve, which comprises a reheating hot section pipeline, a temperature and pressure reducer, a steam extraction regulating valve and a hot re-steam extraction main pipe, wherein the reheating hot section pipeline is communicated with the hot re-steam extraction main pipe through the temperature and pressure reducer and the steam extraction regulating valve in sequence.
Description
Technical Field
The invention belongs to the technical field of cogeneration of large-scale thermal power plants, and relates to a high-parameter industrial steam extraction double-valve combined control system with a postpositional regulating valve.
Background
In recent years, with the promotion of relevant environmental protection policies and coal control policies of China, a large number of enterprise self-contained units and steam boilers are shut down, and a thermal power plant implements cogeneration transformation to externally provide high-parameter industrial steam. In order to ensure stable steam supply pressure and steam supply flow, a steam extraction regulating valve and a temperature and pressure reducing device are required to be arranged on a steam extraction pipeline during transformation.
At present, a check valve, a regulating valve, a temperature and pressure reducing device and the like are sequentially arranged in a domestic mainstream industrial steam extraction system, the steam extraction flow is controlled through the regulating valve, and then the temperature and the pressure of steam are reduced to required parameters through the temperature and pressure reducing device. The most remarkable characteristic is that the regulating valve is arranged at the upstream of the steam extraction pipeline, and the temperature and pressure reducing device is arranged at the downstream of the steam extraction pipeline, so that the regulating valve and the temperature and pressure reducing device can be independently controlled and controlled, and the regulating valve and the temperature and pressure reducing device are not interfered with each other.
And from the view of industrial steam supply projects with large quantity of high parameters and large flow, the safety and reliability of the steam extraction regulating valve become a great technical difficulty, a large number of regulating valve equipment failure cases appear in China, and the potential safety hazard of the whole heating system is greatly increased. The reason is that for a high-parameter industrial steam supply project which takes main steam and high-temperature reheated steam as steam sources, when the regulating valve is arranged at the upstream of the temperature and pressure reducer, the operating environment of the steam extraction regulating valve is extremely severe due to high steam extraction temperature, and the design difficulty and the manufacturing cost of the regulating valve are greatly increased in consideration of ensuring good regulating characteristics, so that the high-parameter steam extraction regulating valve is one of the root causes of frequent faults. Therefore, most domestic industrial steam supply projects with high parameters and large flow adopt an import regulating valve, the supply period is long, the price is high, and the later-period overhaul and maintenance cost is high.
For example, the leaving steam temperature of a typical industrial steam supply project generally only needs to reach 300-400 ℃, the temperature of main steam and high-temperature reheat steam of a subcritical unit can reach 538 ℃, and the temperature of main steam and high-temperature reheat steam of an ultra-supercritical unit can reach over 600 ℃, so that the material and manufacturing cost of a steam extraction regulating valve are greatly increased.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a high-parameter industrial steam extraction double-valve joint control system with a rear regulating valve, which can effectively reduce the material and manufacturing cost of the steam extraction regulating valve.
In order to achieve the purpose, the high-parameter industrial steam extraction double-valve combined control system with the postpositional regulating valve comprises a reheating hot section pipeline, a temperature and pressure reducing device, a steam extraction regulating valve and a hot re-steam extraction main pipe, wherein the reheating hot section pipeline is communicated with the hot re-steam extraction main pipe through the temperature and pressure reducing device and the steam extraction regulating valve in sequence.
The reheating section pipeline is communicated with the temperature and pressure reducing device through a first electric regulating valve in sequence.
And a flow measurement nozzle is arranged between the reheating thermal section pipeline and the first electric regulating valve.
A check valve is arranged between the first electric regulating valve and the temperature and pressure reducing device.
The reheating section pipeline is communicated with the hot reheating steam extraction main pipe through a temperature and pressure reducer, a second electric regulating valve and a steam extraction regulating valve in sequence.
A safety valve is arranged on the pipeline between the temperature and pressure reducing device and the second electric regulating valve.
The inlet and the outlet of the steam extraction regulating valve are both provided with a reducer.
The temperature and pressure reducing device comprises a pressure reducing valve and a temperature reducing valve.
The invention has the following beneficial effects:
when the high-parameter industrial steam extraction double-valve combined control system with the postpositional regulating valve is specifically operated, in order to improve the safety and reliability of the steam extraction regulating valve and reduce the manufacturing cost of the steam extraction regulating valve, the valve group arrangement on a steam extraction pipeline is optimized, namely, a temperature and pressure reducing device is arranged at the upstream of the steam extraction regulating valve, steam is firstly subjected to temperature reduction and proper pressure reduction and then enters the steam extraction regulating valve for flow regulation, so that the inlet steam temperature of the steam extraction regulating valve is greatly reduced, the material requirement and the processing difficulty of the steam extraction regulating valve are obviously reduced, the running environment of the valve is optimized, the reliability of the valve is improved, and the manufacturing cost and the overhauling and maintenance difficulty of the steam extraction regulating valve are greatly reduced.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a control flow chart of the present invention.
Wherein, 1 is a flow measuring nozzle, 2 is a first electric regulating valve, 3 is a check valve, 4 is a temperature and pressure reducing device, 5 is a second electric regulating valve, 6 is a steam extraction regulating valve, and 7 is a safety valve.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the core idea of the present invention is: on the basis of the steam supply valve group arrangement scheme of traditional industry, the steam extraction regulating valve 6 is arranged at the rear, the temperature and pressure reduction device 4 is arranged on the upper stream of the steam extraction regulating valve 6, the steam is firstly subjected to temperature reduction and moderate pressure reduction, the inlet steam temperature of the steam extraction regulating valve 6 is greatly reduced, then the steam extraction regulating valve 6 is combined to perform fine flow regulation and control, and the requirements of steam supply flow and accurate pressure regulation are met through combined regulation and control of the temperature and pressure reduction device 4 and the steam extraction regulating valve 6.
The high-parameter industrial steam extraction double-valve combined control system with the postpositional regulating valve comprises a reheating heat section pipeline, a flow measuring nozzle 1, a first electric regulating valve 2, a check valve 3, a temperature and pressure reducing device 4, a second electric regulating valve 5, a steam extraction regulating valve 6 and a hot reheating steam extraction main pipe, wherein the reheating heat section pipeline is communicated with the hot reheating steam extraction main pipe through the flow measuring nozzle 1, the first electric regulating valve 2, the check valve 3, the temperature and pressure reducing device 4, the second electric regulating valve 5 and the steam extraction regulating valve 6 in sequence, a safety valve 7 is arranged on a pipeline between the temperature and pressure reducing device 4 and the second electric regulating valve 5, the inlet and the outlet of the steam extraction regulating valve 6 are both provided with a reducer, and the temperature and pressure reducing device 4 comprises a pressure reducing valve and a temperature reducing valve.
After steam gets into in the pressure reducer 4, carry out preliminary step-down through the relief pressure valve earlier, then spray water and reduce the temperature, reduce steam temperature to required parameter, steam after the temperature reduction decompression is at steam extraction governing valve 6 of flowing through in the low reaches, through steam extraction governing valve 6 control steam flow, its pressure further descends after steam is through steam extraction governing valve 6 throttle. The key point is that the pressure reducing valve can not directly reduce the pressure of the steam to the pressure required by external supply, and a certain pressure allowance is reserved to overcome the throttling pressure loss in the flow regulation process of the steam extraction regulating valve 6.
In order to realize fine management, the steam pressure at the outlet of the steam extraction regulating valve 6 is controlled to a required pressure value, the pressure reducing valve and the steam extraction regulating valve 6 are jointly controlled, the function of throttling loss and opening degree of the steam extraction regulating valve 6 is arranged in the control logic of the pressure reducing valve and used for rough regulation of the pressure reducing valve, and meanwhile, the pressure value at the outlet of the steam extraction regulating valve 6 is used as a target function to perform closed-loop control on the pressure reducing valve, so that stable steam supply pressure is finally realized.
The specific control process is as follows:
1) according to the implementation steam supply requirement and the flow characteristic of the steam extraction regulating valve 6, the pressure loss of the steam extraction regulating valve 6 is set initially, and the outlet pressure of the pressure reducing valve is set as a target value to regulate the pressure reducing valve;
2) adjusting the steam extraction adjusting valve 6 until the steam supply flow reaches a required value;
and when the outlet pressure of the steam extraction regulating valve 6 exceeds the range of the target value +/-0.1 MPa, correcting the pressure loss value of the steam extraction regulating valve 6 according to a judgment result.
Example one
The invention can obviously reduce the operation parameters of the key valve at the steam extraction opening, reduce the manufacturing cost and improve the reliability by optimizing the valve arrangement mode, and the invention has little influence on the operation parameters, the manufacturing cost and the reliability of the temperature and pressure reducer 4. Table 1 takes a subcritical 300MW unit industrial steam supply project in China as an example, the single-machine steam supply flow is designed according to 200t/h, the pressure of a steam extraction main pipe is 1.8MPa, and the temperature is 300 ℃.
TABLE 1
Wherein, the single machine steam supply flow is designed according to 200t/h, the pressure of the steam extraction main pipe is 1.8MPa, and the temperature is 300 ℃.
The invention can achieve the following effects:
the invention can obviously reduce the inlet parameters of the steam extraction regulating valve 6, the inlet parameters of the steam extraction regulating valve 6 in the traditional arrangement scheme are 4.143MPa and 543 ℃, and the inlet parameters of the steam extraction regulating valve 6 in the invention are 1.8MPa and 300 ℃.
The invention can obviously reduce the working parameters of the pipeline between the pressure reducing valve and the temperature and pressure reducing device 4, the working parameters of the pipeline section in the traditional arrangement scheme are as high as 4.143MPa and 543 ℃, and the working parameters of the pipeline section in the invention are reduced to 1.8MPa and 300 ℃.
The invention can greatly reduce the reconstruction investment, and by taking the scheme in the table 1 as an example, the overall cost of the steam extraction regulating valve 6 is firstly reduced by arranging the steam extraction regulating valve 6 at the rear part, and secondly, the material of the large end and the small end at the front and the rear parts of the steam extraction regulating valve 6 and the material of the pipeline are correspondingly reduced, and the corresponding expenses of purchasing, installation, processing, detection and the like are reduced.
Claims (8)
1. The utility model provides a high parameter industry steam extraction bivalve allies oneself with accuse system behind governing valve which characterized in that, includes reheat hot section pipeline, desuperheating pressure reducer (4), steam extraction governing valve (6) and hot steam extraction mother pipe again, and reheat hot section pipeline is linked together with hot steam extraction mother pipe again through desuperheating pressure reducer (4) and steam extraction governing valve (6) in proper order.
2. The high-parameter industrial steam extraction double-valve joint control system with the rear-mounted regulating valve according to claim 1, characterized in that a reheating hot section pipeline is communicated with a temperature and pressure reducer (4) through a first electric regulating valve (2) in sequence.
3. The high-parameter industrial steam extraction double-valve joint control system with the rear-mounted regulating valve according to claim 2, characterized in that a flow measurement nozzle (1) is arranged between the reheating hot section pipeline and the first electric regulating valve (2).
4. The high-parameter industrial steam extraction double-valve joint control system with the postpositioned regulating valve according to claim 3, characterized in that a check valve (3) is arranged between the first electric regulating valve (2) and the temperature and pressure reducing device (4).
5. The high-parameter industrial steam extraction double-valve joint control system with the postpositional regulating valve according to claim 4, characterized in that a reheating hot section pipeline is communicated with a hot reheating steam extraction main pipe through a temperature and pressure reducer (4), a second electric regulating valve (5) and a steam extraction regulating valve (6) in sequence.
6. The high-parameter industrial steam extraction double-valve joint control system with the rear-mounted regulating valve according to claim 5, characterized in that a safety valve (7) is arranged on a pipeline between the temperature and pressure reducer (4) and the second electric regulating valve (5).
7. The high-parameter industrial steam extraction double-valve joint control system with the postpositioned regulating valve according to claim 1, characterized in that the steam extraction regulating valve (6) is provided with a reducer at the inlet and the outlet.
8. The high-parameter industrial steam extraction double-valve combined control system with the postpositioned regulating valve according to claim 1, characterized in that the temperature and pressure reducer (4) comprises a pressure reducing valve and a temperature reducing valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111350924.0A CN114087603A (en) | 2021-11-15 | 2021-11-15 | High-parameter industrial steam extraction double-valve combined control system with rear regulating valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111350924.0A CN114087603A (en) | 2021-11-15 | 2021-11-15 | High-parameter industrial steam extraction double-valve combined control system with rear regulating valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114087603A true CN114087603A (en) | 2022-02-25 |
Family
ID=80300723
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111350924.0A Pending CN114087603A (en) | 2021-11-15 | 2021-11-15 | High-parameter industrial steam extraction double-valve combined control system with rear regulating valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114087603A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203685322U (en) * | 2013-12-24 | 2014-07-02 | 河北省电力勘测设计研究院 | Steam extraction heat supply system for 350MW supercritical heat supply unit |
| CH707913A2 (en) * | 2013-04-02 | 2014-10-15 | Thermal Power Tec Gmbh Mustafa Youssef | Circuit for preheating feedwater in a steam turbine plant. |
| CN207033513U (en) * | 2017-03-21 | 2018-02-23 | 华电电力科学研究院 | The Systemic Burden self-regulation structure of extraction steam for factories net source one |
| CN211739243U (en) * | 2020-01-22 | 2020-10-23 | 国网浙江省电力有限公司电力科学研究院 | Adjustable device for recycling waste heat of circulating cooling water of auxiliary engine of thermal power generating unit |
| CN111911984A (en) * | 2020-06-23 | 2020-11-10 | 太原理工大学 | Adaptive heating system of thermal power plant and control method thereof |
| CN212079404U (en) * | 2020-03-17 | 2020-12-04 | 新特能源股份有限公司 | Temperature reduction device and industrial steam extraction system |
| CN212408800U (en) * | 2020-05-18 | 2021-01-26 | 华电潍坊发电有限公司 | Heat supply steam connecting pipeline |
| CN213298065U (en) * | 2020-07-10 | 2021-05-28 | 中机国际工程设计研究院有限责任公司 | Steam extraction and heat supply device for reheating heat section of 600MW steam turbine |
-
2021
- 2021-11-15 CN CN202111350924.0A patent/CN114087603A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH707913A2 (en) * | 2013-04-02 | 2014-10-15 | Thermal Power Tec Gmbh Mustafa Youssef | Circuit for preheating feedwater in a steam turbine plant. |
| CN203685322U (en) * | 2013-12-24 | 2014-07-02 | 河北省电力勘测设计研究院 | Steam extraction heat supply system for 350MW supercritical heat supply unit |
| CN207033513U (en) * | 2017-03-21 | 2018-02-23 | 华电电力科学研究院 | The Systemic Burden self-regulation structure of extraction steam for factories net source one |
| CN211739243U (en) * | 2020-01-22 | 2020-10-23 | 国网浙江省电力有限公司电力科学研究院 | Adjustable device for recycling waste heat of circulating cooling water of auxiliary engine of thermal power generating unit |
| CN212079404U (en) * | 2020-03-17 | 2020-12-04 | 新特能源股份有限公司 | Temperature reduction device and industrial steam extraction system |
| CN212408800U (en) * | 2020-05-18 | 2021-01-26 | 华电潍坊发电有限公司 | Heat supply steam connecting pipeline |
| CN111911984A (en) * | 2020-06-23 | 2020-11-10 | 太原理工大学 | Adaptive heating system of thermal power plant and control method thereof |
| CN213298065U (en) * | 2020-07-10 | 2021-05-28 | 中机国际工程设计研究院有限责任公司 | Steam extraction and heat supply device for reheating heat section of 600MW steam turbine |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109442368B (en) | Bypass system comprehensive control method for improving regulating capacity of heat supply unit | |
| CN111237018A (en) | Industrial steam residual pressure cascade utilization system applied to coal-fired steam supply unit in shutdown non-shutdown mode | |
| CN206539378U (en) | Cogeneration units depth peak regulation system is improved using unit bypass heat supply | |
| CN107956517A (en) | A kind of therrmodynamic system and method for the decoupling of depth thermoelectricity | |
| CN212154886U (en) | Industrial steam residual pressure cascade utilization system applied to coal-fired steam supply unit in shutdown non-shutdown mode | |
| CN104390234A (en) | Coordinated control method for ultra-supercritical generator set with dual-inlet and dual-outlet coal mill | |
| CN206959102U (en) | Cogeneration units depth peak regulation system is improved using electric boiler heat supply | |
| CN112594667A (en) | System and method for adjusting reheat steam temperature of high-temperature ultrahigh-pressure reheat dry quenching boiler | |
| CN105888753B (en) | Medium-pressure and low-pressure industrial steam supply method and system through medium-pressure and low-pressure communication butterfly valve adjustment and hot press adoption | |
| CN110700909B (en) | Internet surfing electric load adjusting system and adjusting method for heating Ji Re cogeneration unit | |
| CN114087603A (en) | High-parameter industrial steam extraction double-valve combined control system with rear regulating valve | |
| CN109653819B (en) | Deep peak-shaving steam turbine system of cogeneration unit and control method | |
| CN204806439U (en) | Urea pyrolysis high temperature air heat exchanger in denitration flow | |
| CN108278134B (en) | Method for coordinately controlling generator set of main pipe direct-current boiler | |
| CN111237735A (en) | Emergency industrial steam supply system for realizing shutdown and non-shutdown of large coal-fired generator set | |
| CN216950586U (en) | Natural gas preheating system by using residual heat of residual boiler | |
| CN112031883B (en) | Two-stage adjusting system suitable for middle adjusting valve participating in adjusting and lifting industrial steam supply parameters | |
| CN212898634U (en) | Steam pressure difference turbine expansion power generation system | |
| CN213298065U (en) | Steam extraction and heat supply device for reheating heat section of 600MW steam turbine | |
| CN209586456U (en) | A kind of steam distribution system based on piping-main scheme different parameters grade unit | |
| CN110056402B (en) | Steam complementary energy utilization coupling steam extraction heat supply system and adjusting method | |
| CN218821856U (en) | Waste gas waste heat recovery system | |
| CN207406389U (en) | A kind of biomass high-temperature super-pressure reheating generating set quickly opens furnace system | |
| CN110878708A (en) | Economical and practical large-flow high-parameter industrial steam supply system | |
| CN218565449U (en) | Air preheater soot blowing standby steam source system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |