CN210948813U - Automatic drainage system for preventing heat supply steam turbine from entering cold steam - Google Patents
Automatic drainage system for preventing heat supply steam turbine from entering cold steam Download PDFInfo
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- CN210948813U CN210948813U CN201920842299.3U CN201920842299U CN210948813U CN 210948813 U CN210948813 U CN 210948813U CN 201920842299 U CN201920842299 U CN 201920842299U CN 210948813 U CN210948813 U CN 210948813U
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Abstract
The utility model relates to a prevent that heat supply steam turbine from advancing automatic drainage system of cold vapour for solve because of the heat supply take out the steam check valve, close the valve soon and transfer the valve in the condensate water that accumulates take out to low-pressure jar or intermediate pressure jar in make the cylinder body metal cool off fast, cause the problem of serious electric power production accidents such as cylinder body deformation, equipment damage. The automatic drainage system for preventing the heat supply turbine from entering cold steam is characterized in that a first thermocouple is arranged on the upper wall of a heat supply steam extraction pipeline, a second thermocouple is arranged on the lower wall of the heat supply steam extraction pipeline, a drainage pipeline is divided from the heat supply steam extraction pipeline, a pneumatic control drainage valve is arranged on the drainage pipeline, and the drainage pipeline is finally communicated with a condenser or a condenser body expansion tank; the system utilizes the temperature difference between the upper pipe wall and the lower pipe wall of the steam extraction pipeline and controls the drainage pneumatic control valve through a distributed control system, and low-temperature steam or water is drained in time by utilizing the negative pressure of the condenser.
Description
Technical Field
The utility model relates to a heat supply steam turbine system, concretely relates to prevent that heat supply steam turbine from advancing automatic drainage system of cold vapour.
Background
With the popularization of cogeneration in recent years, most of high-capacity turbines adopt steam extraction to regulate the turbines to supply heat, namely, a punching steam extraction technology is adopted on a low-pressure steam exhaust pipe in the turbine to extract a part of low-quality steam to provide the low-quality steam for heat users, and a specific thermodynamic system is shown in figure 1.
In non-heating seasons or during steam extraction standby periods of a heat supply unit, because the heat supply steam extraction check valve, the quick closing valve and the adjusting valve are not completely sealed, low-temperature steam or condensed water condensed by steam can be accumulated in the system. If the unit is used for load shedding or the steam turbine is tripped, the condenser is under negative pressure (normally operates at about minus 90 kpa) and is connected with the low-pressure cylinder (usually the condenser is positioned below the low-pressure cylinder), so that cold steam or steam condensed water accumulated among the heat supply steam extraction check valve, the quick closing valve and the regulating valve can be instantly vaporized and is extracted into the low-pressure cylinder and the medium-pressure cylinder, the steam turbine enters water to quickly cool metal of the high-temperature medium-low pressure cylinder, particularly the medium-pressure cylinder, so that serious power production accidents such as cylinder body deformation, equipment damage and the like are caused, and the requirement of twenty-five counter measures for reverse power production on water inlet of the steam turbine is seriously violated.
In order to eliminate the faults caused by water inlet of the steam turbine, the conventional scheme is to solve the problem that the heat supply steam extraction check valve, the quick closing valve and the adjusting valve of the steam turbine are not completely sealed, the pipe diameter of a low-pressure communicating pipe in the steam turbine is about 1000mm approximately, and the pipe diameter of a steam extraction pipe is about 1000mm approximately.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a prevent that heat supply steam turbine from advancing automatic drainage system of cold vapour to solve because of the heat supply take out the steam check valve, close the valve soon and transfer the valve in store up the condensate water take out to low-pressure jar or intermediate pressure jar in make the cylinder body metal cool off fast, cause the problem of serious electric power production accidents such as cylinder body deformation, equipment damage.
In order to achieve the above object, the technical solution of the present invention is:
an automatic drainage system for preventing a heat supply turbine from entering cold steam comprises a medium pressure cylinder, a low pressure cylinder, a medium and low pressure communicating valve, a check valve, a quick closing valve, a regulating valve and a condenser; a middle-low pressure communicating valve is arranged on a pipeline connecting the middle-pressure cylinder and the low-pressure cylinder, a heat supply steam extraction pipeline is divided from the pipeline between the middle-low pressure communicating valve and the middle-low pressure communicating valve, and the heat supply steam extraction pipeline is sequentially provided with a check valve, a quick closing valve and a regulating valve and finally leads to a hot user; the condenser is communicated with the low-pressure cylinder and is positioned below the low-pressure cylinder; it is characterized in that:
the upper wall of the heat supply steam extraction pipeline between the initial end and the check valve is provided with a first thermocouple, and the lower wall of the heat supply steam extraction pipeline is provided with a second thermocouple;
a drain pipeline is divided from the heat supply steam extraction pipeline between the first thermocouple and the check valve, a pneumatic control drain valve is arranged on the drain pipeline, and the pneumatic control drain valve is communicated with a condenser or a condenser body expansion tank;
the signal output ends of the first thermocouple and the second thermocouple are respectively connected with the signal input end of the distributed control system; and the signal output end of the distributed control system is connected with the signal input end of the pneumatic control trap.
Furthermore, △ t is set as the difference value of the temperatures of the upper wall and the lower wall of the heat supply steam extraction pipeline, when △ t is more than or equal to 42 ℃, the distributed control system sends an instruction to the air control drain valve, and when △ t is less than or equal to 28 ℃, the distributed control system sends a closing instruction to the air control drain valve.
Further, the first thermocouple and the second thermocouple are located at the same position in the axial direction of the pipe.
The utility model has the advantages that:
the utility model utilizes the temperature difference between the upper and lower pipe walls of the steam extraction pipeline and controls the drainage pneumatic control valve through the distributed control system, so as to drain low-temperature steam or water in time by utilizing the negative pressure of the condenser, thereby ensuring the safety of the unit; the drainage scheme is reasonable, easy to implement, high in feasibility, low in investment and suitable for large-capacity steam extraction regulation heat supply units.
Drawings
FIG. 1 is a diagram of a prior art heating turbine system;
fig. 2 is a diagram of the heating steam turbine system of the present invention.
The reference numbers are as follows:
1-medium pressure cylinder, 2-low pressure cylinder, 3-medium and low pressure communicating valve, 4-first thermocouple, 5-second thermocouple, 6-pneumatic control drain valve, 7-check valve, 8-quick closing valve, 9-adjusting valve, 10-heat user and 11-high pressure cylinder.
Detailed Description
The invention is described in further detail below with reference to the following figures and specific examples:
as shown in fig. 2, the automatic drainage system for preventing cold steam from entering a heat supply turbine comprises a medium pressure cylinder 1, a low pressure cylinder 2, a medium and low pressure communicating valve 3, a check valve 7, a quick closing valve 8, a regulating valve 9, a condenser, a high pressure cylinder 11, a pneumatic control drainage valve 6, a first thermocouple 4 and a second thermocouple 5;
a middle-low pressure communicating valve 3 is arranged on a pipeline connecting the middle-pressure cylinder 1 and the low-pressure cylinder 2, a heat supply steam extraction pipeline is divided from the pipeline between the middle-low pressure communicating valve 3 and the middle-low pressure communicating valve 1, and the heat supply steam extraction pipeline is sequentially provided with a check valve 7, a quick closing valve 8 and a regulating valve 9 and finally leads to a heat user 10; the condenser is communicated with the low-pressure cylinder 2 and is positioned below the low-pressure cylinder 2;
the upper wall of the heat supply steam extraction pipeline between the initial end and the check valve 7 is provided with a first thermocouple 4, and the lower wall is provided with a second thermocouple 5; the first thermocouple 4 and the second thermocouple 5 are located at the same position in the axial direction of the pipe.
A drain pipeline is divided from the heat supply steam extraction pipeline between the first thermocouple 4 and the second thermocouple 5 and the check valve 7, a pneumatic control drain valve 6 is arranged on the drain pipeline, and the pneumatic control drain valve 6 is communicated with a condenser or a condenser body expansion tank through the drain pipeline;
the signal output ends of the first thermocouple 4 and the second thermocouple 5 are respectively connected with the signal input end of the distributed control system; and the signal output end of the distributed control system is connected with the signal input end of the pneumatic control trap 6.
High-temperature steam existing in the steam extraction pipeline is located on the upper portion of the pipeline during heat supply, accumulated water or low-temperature steam can be gathered below the steam extraction pipeline, and therefore the temperature of the upper pipe wall of the steam extraction pipeline is larger than that of the lower pipe wall.
The first thermocouple 4 and the second thermocouple 5 of the heat supply steam extraction pipeline respectively measure the upper wall temperature and the lower wall temperature of the heat supply pipeline, the measured results are input into logic judgment of the distributed control system DCS, subtraction operation is carried out on the upper wall temperature and the lower wall temperature to obtain a temperature difference value △ t, when △ t is larger than or equal to 42 ℃, the distributed control system DCS sends an opening instruction to the pneumatic control steam trap 6, when △ t is smaller than or equal to 28 ℃, the distributed control system DCS sends a closing instruction to the pneumatic control steam trap 6, and therefore automatic on-off control of the pneumatic control steam trap 6 is achieved.
By controlling the opening and closing of the drainage pneumatic control valve 6, low-temperature steam or water accumulated in the heat supply pipeline is pumped away by utilizing the negative pressure of the condenser, so that the drainage function is realized, and serious electric power production accidents such as deformation of a cylinder body and damage of equipment caused by pumping the low-temperature steam or water into the low-pressure cylinder 2 and the intermediate pressure cylinder 1 are prevented.
Through tests, the pneumatic control drain valve 6 controlled by the temperature difference between the upper wall and the lower wall is additionally arranged on the heat supply steam extraction pipeline of the unit, cold steam and water accumulated in the heat supply steam extraction pipeline are drained to the condenser, and the water inflow of the steam turbine is thoroughly and effectively prevented.
The above is only the embodiment of the present invention, and is not the limitation of the protection scope of the present invention, all the equivalent structure changes made in the contents of the specification and the drawings, or the direct or indirect application in other related technical fields are included in the patent protection scope of the present invention.
Claims (2)
1. An automatic drainage system for preventing a heat supply turbine from entering cold steam comprises a medium pressure cylinder (1), a low pressure cylinder (2), a medium and low pressure communicating valve (3), a check valve (7), a quick closing valve (8), a regulating valve (9) and a condenser; a middle-low pressure communicating valve (3) is arranged on a pipeline connecting the middle-pressure cylinder (1) and the low-pressure cylinder (2), a heat supply steam extraction pipeline is divided from the pipeline between the middle-low pressure communicating valve (3) and the middle-low pressure communicating valve (1), and the heat supply steam extraction pipeline is sequentially provided with a check valve (7), a quick-closing valve (8) and an adjusting valve (9) and finally leads to a hot user (10); the condenser is communicated with the low pressure cylinder (2) and is positioned below the low pressure cylinder (2); the method is characterized in that:
the upper wall of the heat supply steam extraction pipeline between the initial end and the check valve (7) is provided with a first thermocouple (4), and the lower wall is provided with a second thermocouple (5);
a drain pipeline is divided from the heat supply steam extraction pipeline between the first thermocouple (4), the second thermocouple (5) and the check valve (7), a pneumatic control drain valve (6) is arranged on the drain pipeline, and the pneumatic control drain valve (6) is communicated with a condenser or a condenser body flash tank;
the signal output ends of the first thermocouple (4) and the second thermocouple (5) are respectively connected with the signal input end of the distributed control system; the signal output end of the distributed control system is connected with the signal input end of the pneumatic control trap (6).
2. An automatic drainage system for preventing cold steam from entering a heat supply turbine according to claim 1, wherein: the first thermocouple (4) and the second thermocouple (5) are located at the same position in the axial direction of the pipeline.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920842299.3U CN210948813U (en) | 2019-06-05 | 2019-06-05 | Automatic drainage system for preventing heat supply steam turbine from entering cold steam |
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| CN201920842299.3U CN210948813U (en) | 2019-06-05 | 2019-06-05 | Automatic drainage system for preventing heat supply steam turbine from entering cold steam |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112761738A (en) * | 2021-02-08 | 2021-05-07 | 浙江浙能技术研究院有限公司 | Novel method for judging tightness of steam extraction check valve of steam turbine |
| CN114370307A (en) * | 2021-12-15 | 2022-04-19 | 东方电气集团东方汽轮机有限公司 | Drainage system and drainage method for high-pressure steam guide pipe of steam turbine |
-
2019
- 2019-06-05 CN CN201920842299.3U patent/CN210948813U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112761738A (en) * | 2021-02-08 | 2021-05-07 | 浙江浙能技术研究院有限公司 | Novel method for judging tightness of steam extraction check valve of steam turbine |
| CN112761738B (en) * | 2021-02-08 | 2022-12-23 | 浙江浙能技术研究院有限公司 | Novel method for judging tightness of steam extraction check valve of steam turbine |
| CN114370307A (en) * | 2021-12-15 | 2022-04-19 | 东方电气集团东方汽轮机有限公司 | Drainage system and drainage method for high-pressure steam guide pipe of steam turbine |
| CN114370307B (en) * | 2021-12-15 | 2023-07-14 | 东方电气集团东方汽轮机有限公司 | Steam turbine high-pressure steam guide pipe drainage system and drainage method |
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