CN214403681U - System capable of adjusting steam extraction width load operation of middle-low pressure communicating pipe - Google Patents
System capable of adjusting steam extraction width load operation of middle-low pressure communicating pipe Download PDFInfo
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- CN214403681U CN214403681U CN202120484629.3U CN202120484629U CN214403681U CN 214403681 U CN214403681 U CN 214403681U CN 202120484629 U CN202120484629 U CN 202120484629U CN 214403681 U CN214403681 U CN 214403681U
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Abstract
The utility model discloses a system of wide load operation of adjustable extraction of vapour of well low pressure communicating pipe, the utility model discloses a set up extraction of vapour cooling pipeline, make the one end of extraction of vapour cooling pipeline connect cold re-pipeline, the other end passes through injection nozzle and connects four extraction of tubes way and well low pressure communicating pipe, from cold re-pipeline extraction of vapour, spray the cooling to four extraction of tubes way and well low pressure communicating pipe, it keeps watch on through well row's temperature operation measurement point, the adjustment extraction of vapour volume, well row's temperature is less than the safe operation limit value when guaranteeing the stable industry steam supply operation of unit low-load, the operation mode is nimble, can guarantee the requirement of industry steam supply quality and steam supply volume, can satisfy the wide load operation under the unit degree of depth peak regulation state again, the secondary of having avoided industry steam supply system is reformed transform.
Description
Technical Field
The utility model belongs to the technical field of coal-fired generating set combined heat and power generation heat supply, concretely relates to system of adjustable extraction wide load operation of well low pressure communicating pipe.
Background
In recent years, the installed capacity of power generation is rapidly increased, the power demand is slowly increased, and meanwhile, with the rapid development of clean energy, the power utilization structure is greatly changed, and the deep peak regulation to low-load operation of a large thermal power generating unit becomes a normal state. When the coal-fired generating set frequently participates in deep peak regulation, the coal-fired generating set bearing industrial steam supply must ensure the reliability and stability of industrial steam supply parameters, and the requirements of steam utilization enterprises need to be met according to quality and quantity, so that the problem of production reduction and even production stoppage caused by the reduction of steam quality and steam quantity of the steam utilization enterprises is avoided, and serious economic loss is caused.
A large number of coal-fired generating sets undertake external industrial steam supply through technical transformation, and the medium-exhaust steam extraction and steam supply technology based on medium-low pressure communicating pipe heat supply butterfly valve adjustment is generally applied. The industrial steam supply technology belongs to adjustable steam extraction, and the industrial steam supply pressure and flow are kept stable by participating in adjustment through a valve in the variable working condition operation process of a steam turbine generator unit. However, when the unit operates at a lower load, the regulating valve is further closed, and the steam is greatly increased in pressure, so that the exhaust temperature of the intermediate pressure cylinder is further increased. When the middle exhaust temperature exceeds a safety limit value, potential equipment safety hazards are caused, and the cogeneration unit cannot meet the requirement of deep peak regulation of a power grid because of bearing industrial steam supply.
The operation range of the adjustable steam extraction technology of the medium-low pressure communicating pipe is narrow, the contradiction between the deep peak regulation requirement of the coal-electric unit and the guarantee of the steam supply capacity is difficult to effectively solve, the current solution idea of switching to high-grade steam extraction such as heat recovery exists, but the defects of large investment of pipeline valves, high steam supply energy consumption and the like exist. In a word, no solution for widening the operation range of the adjustable industrial steam supply scheme of the medium-low pressure communicating pipe considering both investment and operation economy exists at present.
Disclosure of Invention
The utility model aims to overcome the contradiction that narrow, the degree of depth peak regulation demand of operating range and the low-load industry steam supply ability guarantee are difficult to effectively solve in the current industry steam supply technique of arranging not enough, provide a system of the wide load operation of adjustable extraction of well low pressure communicating pipe.
In order to achieve the purpose, the utility model comprises a high pressure cylinder, an intermediate pressure cylinder and a low pressure cylinder;
the high-pressure cylinder is connected with a reheater through a cold re-pipeline, the reheater is connected with a medium-pressure cylinder through a reheater pipeline, a part of exhaust gas of the medium-pressure cylinder enters a deaerator and a small steam turbine for a steam feed pump through a four-pumping pipeline, and the rest exhaust gas enters a medium-low pressure communicating pipe;
the cold recycling pipeline is connected with one end of a steam extraction cooling pipeline, the other end of the steam extraction cooling pipeline is connected with the four-extraction pipeline and the medium-low pressure communicating pipe through the injection nozzle, the steam extraction cooling pipeline is provided with an adjustable valve group, and a plurality of temperature measuring points are arranged in the four-extraction pipeline and the medium-low pressure communicating pipe.
And a part of the exhaust gas in the middle and low pressure communicating pipe enters an industrial steam supply pipeline, and the rest of the exhaust gas enters a low pressure cylinder.
The low-pressure cylinder is connected with a condenser.
The industrial steam supply pipeline is provided with a valve group.
And the middle and low pressure communicating pipe is provided with an adjusting valve.
And the injection nozzles of the steam extraction cooling pipelines are arranged at the positions of the four steam extraction pipelines close to the steam extraction port.
And the injection nozzle of the steam extraction cooling pipeline is arranged at the position, close to the steam exhaust position of the medium-low pressure communicating pipe, of the medium-pressure cylinder.
The high pressure cylinder is connected with a main steam pipeline.
Compared with the prior art, the utility model discloses a system is through setting up the steam extraction cooling pipeline, make the one end of steam extraction cooling pipeline connect cold re-pipeline, the other end passes through injection nozzle and connects four pipelines and well low pressure communicating pipe, from cold re-pipeline steam extraction, spray the cooling to four pipelines and well low pressure communicating pipe, through well row temperature operation measurement station monitoring, the adjustment steam extraction volume, well row's temperature is less than the safe operation limit value when guaranteeing that the industry steam supply operation is stabilized to the unit low-load, the operation mode is nimble, can guarantee the requirement of industry steam supply quality and steam supply volume, can satisfy wide load operation under the unit degree of depth peak regulation state again, the secondary of industry steam supply system is reformed transform has been avoided.
Drawings
FIG. 1 is a system configuration diagram of the present invention;
FIG. 2 is a schematic diagram of the arrangement of the temperature measuring points and the spray nozzles in the present invention;
FIG. 3 is a graph showing the variation of the middle discharge temperature and the cold reheat temperature under different loads in the example;
the system comprises a high-pressure cylinder 1, a high-pressure cylinder 2, a medium-pressure cylinder 3, a main steam pipeline 4, a reheat pipeline 5, a cold reheat pipeline 6, a low-pressure cylinder 7, a medium-low pressure communicating pipe 8, a four-extraction pipeline 9, an extraction cooling pipeline 10, an adjusting valve 11, an industrial steam supply pipeline 12, a valve group 13, an adjustable valve group 14, a condenser 15, an injection nozzle 16 and a temperature measuring point.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
Referring to fig. 1 and 2, the utility model comprises a high pressure cylinder 1, a medium pressure cylinder 2 and a low pressure cylinder 6, main steam generated by a boiler superheater enters the high pressure cylinder 1 through a main steam pipeline 3, and exhaust steam generated after the main steam expands and works in the high pressure cylinder 1 enters a boiler reheater through a cold re-pipeline 5; reheated steam generated by a boiler reheater enters an intermediate pressure cylinder 2 through a reheated pipeline 4, a part of exhaust steam generated after the reheated steam expands and works in the intermediate pressure cylinder 2 enters a deaerator and a small steam turbine for a steam-driven water feed pump through a four-pumping pipeline 8, the rest of exhaust steam enters a medium-low pressure communicating pipe 7, a part of steam entering the medium-low pressure communicating pipe 7 enters an industrial steam supply pipeline 11, and the rest of steam enters a low pressure cylinder 6; the exhaust steam of the intermediate pressure cylinder 2 enters the low pressure cylinder 6 to be expanded and do work, and then is discharged into the condenser 14, and after being condensed, the exhaust steam enters the thermodynamic system to complete thermodynamic cycle; and an extraction steam cooling pipeline 9, wherein extraction steam comes from the cold re-pipeline 5 and respectively enters the four extraction pipelines 8 at the position close to a steam extraction port through an adjustable valve group 13 and the middle-low pressure communicating pipe 7 at the position close to the steam exhaust position of the middle-pressure cylinder. An adjustable valve group 13 is arranged on the steam extraction pipeline of the steam extraction cooling pipeline 9. The steam extraction cooling pipeline 9 is started when the exhaust steam temperature of the intermediate pressure cylinder is higher than the safe operation limit value. The cold re-steam of the steam extraction and temperature reduction pipeline is sprayed into the pipeline through a plurality of nozzles 15 which are evenly distributed in the circumferential direction of the four extraction pipelines 8 and the medium-low pressure communicating pipe 7. The steam extraction cooling pipeline is provided with 3 temperature measuring points 16 respectively in the circumferential direction of the four extraction pipelines 8 and the middle-low pressure communicating pipe 7.
The working principle is as follows:
at unit low-load operating condition, for satisfying user's demand, well low pressure communicating pipe heat supply butterfly valve further closes row's pressure in order to lift by a wide margin, and well row's temperature risees by a wide margin simultaneously and arouses four equipment potential safety hazards such as taking out pipeline, oxygen-eliminating device, the little steam turbine of feed pump, well low pressure communicating pipe, low pressure jar, the utility model provides a mix high-pressure low temperature steam and arrange steam temperature in order to reduce. In the pressure seeking sequence, the only cooling steam available is cold reheat steam.
The cogeneration unit adopts a medium-exhaust adjustable steam extraction mode based on medium-low pressure communicating pipe adjustment to supply industrial steam pressure to the outside in a grade range of about 0.8-1 MPa. A1000 MW ultra-supercritical unit bears 0.9MPa and 100t/h of industrial extraction steam, the limit value of the medium exhaust temperature given by a steam turbine manufacturer is about 400 ℃, and the change curves of the medium exhaust temperature and the cold re-temperature under different loads are shown in figure 3 after calculation.
As can be seen from fig. 3, under the low-load steam supply working condition, the efficiency of the intermediate pressure cylinder is greatly reduced due to the fact that the regulating valve of the unit is greatly closed to increase the intermediate pressure, the temperature of the intermediate pressure cylinder is greatly increased, when the load is reduced to about 750MW, the intermediate pressure temperature reaches the safe operation limit value of 400 ℃, and if the intermediate pressure steam is not cooled, the load of the unit cannot be further deeply regulated; the cold reheat temperature does not change much with the load drop, so the smaller the load, the greater the difference between the cold reheat temperature and the mid-row temperature. Therefore, the purpose of cooling the exhaust steam of the intermediate pressure cylinder by cooling and then steam can be achieved under low load.
And when the load of the ultra-supercritical 1000MW unit is over 755MW (the load is 5MW higher than the safe operation limit value by 400 ℃ so as to ensure the safe operation of the unit), the medium exhaust temperature is lower than the safe operation limit value under the condition of meeting the requirements of industrial steam supply parameters and flow. The control logic is: the extraction cooling pipeline is not put into operation and the adjustable valve set 13 is closed.
And (3) operating under a low-load working condition, when the load of the ultra-supercritical 1000MW unit is below 755MW, in order to ensure steam supply parameters and flow, the regulating valve 10 is greatly closed, so that the power capacity of the intermediate pressure cylinder is further reduced, the steam exhaust temperature is greatly increased and is higher than a limit value given by a steam turbine plant level, and the equipment safety is endangered. The control logic is: the steam extraction cooling pipeline is put into operation, and the adjustable valve group 13 is opened.
The valve opening of the adjustable valve group 13 is adjusted through monitoring of a middle exhaust temperature operation measuring point, the steam extraction amount is further adjusted, the middle exhaust temperature is lower than the safe operation limit value when the low-load stable industrial steam supply operation of the unit is ensured, and the purpose of wide-load operation of the unit is achieved.
Claims (8)
1. A system for adjusting steam extraction wide load operation of a medium-low pressure communicating pipe is characterized by comprising a high-pressure cylinder (1), a medium-pressure cylinder (2) and a low-pressure cylinder (6);
the high-pressure cylinder (1) is connected with a reheater through a cold re-heating pipeline (5), the reheater is connected with the intermediate-pressure cylinder (2) through a re-heating pipeline (4), one part of exhaust gas of the intermediate-pressure cylinder (2) enters a deaerator and a small steam turbine for a steam-driven feed pump through a four-pumping pipeline (8), and the rest of exhaust gas enters an intermediate-pressure and low-pressure communicating pipe (7);
the cold re-pipeline (5) is connected with one end of a steam extraction cooling pipeline (9), the other end of the steam extraction cooling pipeline (9) is connected with a four-extraction pipeline (8) and a medium-low pressure communicating pipe (7) through a jet nozzle (15), an adjustable valve group (13) is arranged on the steam extraction cooling pipeline (9), and a plurality of temperature measuring points (16) are arranged in the four-extraction pipeline (8) and the medium-low pressure communicating pipe (7).
2. The system for the adjustable steam extraction wide-load operation of the medium and low pressure communicating pipe according to claim 1, characterized in that a part of the exhaust gas in the medium and low pressure communicating pipe (7) enters an industrial steam supply pipeline (11), and the rest enters the low pressure cylinder (6).
3. The system for the adjustable-extraction wide-load operation of the medium-low pressure communicating pipe according to claim 2, characterized in that the low-pressure cylinder (6) is connected with a condenser (14).
4. The system for operating the medium-low pressure communicating pipe with the adjustable steam extraction and the wide load according to claim 2, is characterized in that a valve group (12) is arranged on an industrial steam supply pipeline (11).
5. The system for adjustable steam extraction wide-load operation of the medium and low pressure communicating pipe according to claim 2, characterized in that the medium and low pressure communicating pipe (7) is provided with an adjusting valve (10).
6. The system for the adjustable steam extraction wide load operation of the middle and low pressure communicating pipe according to claim 1, characterized in that the injection nozzle of the steam extraction cooling pipeline (9) is arranged at the position of the four extraction pipelines (8) close to the steam extraction port.
7. The system for the adjustable steam extraction wide load operation of the medium and low pressure communicating pipe according to claim 1, characterized in that the injection nozzle of the steam extraction cooling pipeline (9) is arranged at the position of the medium and low pressure communicating pipe (7) close to the steam exhaust of the medium pressure cylinder.
8. The system for operating the medium and low pressure communicating pipe with adjustable extraction steam and wide load according to claim 1, characterized in that the high pressure cylinder (1) is connected with the main steam pipeline (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120484629.3U CN214403681U (en) | 2021-03-05 | 2021-03-05 | System capable of adjusting steam extraction width load operation of middle-low pressure communicating pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120484629.3U CN214403681U (en) | 2021-03-05 | 2021-03-05 | System capable of adjusting steam extraction width load operation of middle-low pressure communicating pipe |
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| Publication Number | Publication Date |
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| CN214403681U true CN214403681U (en) | 2021-10-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120484629.3U Active CN214403681U (en) | 2021-03-05 | 2021-03-05 | System capable of adjusting steam extraction width load operation of middle-low pressure communicating pipe |
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| CN (1) | CN214403681U (en) |
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2021
- 2021-03-05 CN CN202120484629.3U patent/CN214403681U/en active Active
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