CN210068247U - Cooling and pressure reducing high-pressure bypass of steam turbine unit - Google Patents
Cooling and pressure reducing high-pressure bypass of steam turbine unit Download PDFInfo
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- CN210068247U CN210068247U CN201920984004.6U CN201920984004U CN210068247U CN 210068247 U CN210068247 U CN 210068247U CN 201920984004 U CN201920984004 U CN 201920984004U CN 210068247 U CN210068247 U CN 210068247U
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Abstract
A cooling and pressure reducing high-pressure bypass of a steam turbine set comprises four bypass communicating pipes, and a first high bypass pressure reducing valve, a second high bypass pressure reducing valve, a third high bypass pressure reducing valve and a fourth high bypass pressure reducing valve which are respectively arranged on the four bypass communicating pipes, wherein the four high bypass pressure reducing valves are symmetrically arranged on two sides of A and B, the first high bypass pressure reducing valve and the third high bypass pressure reducing valve are arranged on the A side, and the second high bypass pressure reducing valve and the fourth high bypass pressure reducing valve are arranged on the B side; the first high bypass pressure reducing valve and the second high bypass pressure reducing valve are controlled to act through three parallel control valves, and the third high bypass pressure reducing valve and the fourth high bypass pressure reducing valve are controlled to act through three parallel control valves. The bypass realizes the on-site switching value hard interlocking protection and analog quantity protection of the high-bypass pressure reducing valve by improving on-site hardware equipment and a control logic soft loop, thereby avoiding the misoperation of the equipment and avoiding the refusal of the equipment at the same time, and ensuring the safe and reliable operation of the turboset.
Description
Technical Field
The utility model relates to a thermal power generation field, especially a turbine unit's cooling decompression high pressure bypass.
Background
The high-pressure bypass system of the steam turbine is an important component of a thermodynamic system of a modern unit set, and has two main functions: firstly, when the operating pressure of the main steam exceeds a set range, the high-pressure bypass device can be automatically opened or closed, and the pressure and the temperature are automatically adjusted according to the operating condition of the unit until the operating pressure of the main steam is restored to a normal value; and secondly, the main steam at the boiler side is directly introduced into a reheater after being subjected to temperature reduction and pressure reduction so as to protect the safety of the reheater.
In the prior art, the high-pressure bypass overpressure protection is equivalent to a mechanical safety valve on a pressure container, a hard-wired loop and a mechanical pressure switch are adopted in the protection design, uncertainty possibly brought by soft logic and electronic pressure switches is avoided, pressure relief can be realized by adopting one pressure switch action, equipment is protected to be safe, each high-pressure bypass pressure relief protection valve is provided with three oil-discharging electromagnetic pressure distribution valves (R/S/T), the opening speed of the high-pressure bypass pressure relief valves is related to the number of actions of the electromagnetic pressure distribution valves, one pressure switch action only controls one electromagnetic pressure distribution valve to discharge oil, the design can ensure safe pressure relief of the high-pressure bypass overpressure protection, but the possibility of equipment misoperation also exists, for example, when any one pressure switch of a high-pressure bypass system has abnormal conditions such as switch contact failure or disconnection, the hard-loop protection function of a control cabinet causes the corresponding two high-pressure bypass pressure, if measures are not taken in time, tripping of the unit may also occur.
Disclosure of Invention
The utility model aims to solve the technical problem that to prior art not enough, provide one kind and had both avoided equipment maloperation, avoided equipment to reject simultaneously again, can effectively guarantee the cooling decompression high pressure bypass of the turboset of the unit safe and reliable operation of getting up.
The technical problem to be solved by the utility model is realized through the following technical scheme. The utility model relates to a cooling decompression high pressure bypass of turboset, this bypass includes four bypass communicating pipes and installs first high side relief pressure valve, second high side relief pressure valve, third high side relief pressure valve, fourth high side relief pressure valve on four bypass communicating pipes respectively, four high side relief pressure valves divide first second both sides symmetrical arrangement, first high side relief pressure valve and third high side relief pressure valve set up in first side, second high side relief pressure valve and fourth high side relief pressure valve set up in second side;
the switching value hard wiring terminals of the first high-pressure side pressure reducing valve and the second high-pressure side pressure reducing valve are controlled to act through three control valves connected in parallel, one control valve for controlling the first high-pressure side pressure reducing valve and one control valve for controlling the second high-pressure side pressure reducing valve form a control valve group, each control valve group is controlled to act through two pressure switches, and each pressure switch is installed on a main steam pipeline on the first side of the steam turbine unit;
the other relief pressure valve of third height and the other relief pressure valve switching value of fourth height are connected hard wiring end and are all controlled the action through three control valve that connect in parallel, and a control valve group is constituteed to the other relief pressure valve of a control third height and the control valve of the other relief pressure valve of a control fourth height, and every control valve group all controls the action through two pressure switch, and every pressure switch all installs on the second side main steam pipe way of turboset.
The technical problem to be solved by the present invention can be further solved by the following technical solution, wherein for the cooling and pressure reducing high-pressure bypass of the steam turbine set, the three control valves for controlling the first high-pressure side pressure reducing valve are the first control valve, the second control valve and the third control valve, and the three control valves for controlling the second high-pressure side pressure reducing valve are the fourth control valve, the fifth control valve and the sixth control valve;
the first control valve and the fourth control valve form a first control valve group, and two pressure switches for controlling the first control valve group are a first pressure switch and a fourth pressure switch; the second control valve and the fifth control valve form a second control valve group, and two pressure switches for controlling the second control valve group are a second pressure switch and a fifth pressure switch; the third control valve and the sixth control valve form a third control valve group, and two pressure switches for controlling the third control valve group are a third pressure switch and a sixth pressure switch; the first pressure switch and the fourth pressure switch share one sampling pipeline, the second pressure switch and the fifth pressure switch share one sampling pipeline, the third pressure switch and the sixth pressure switch share one sampling pipeline, and the six pressure switches are all arranged on a main steam pipeline on the first side of the steam turbine set;
the control end of the first control valve and the control end of the fourth control valve are connected in parallel and then are sequentially connected with the first pressure switch and the fourth pressure switch in series; the control end of the second control valve and the control end of the fifth control valve are connected in parallel and then are sequentially connected with the second pressure switch and the fifth pressure switch in series; the control end of the third control valve and the control end of the sixth control valve are connected in parallel and then are sequentially connected with the third pressure switch and the sixth pressure switch in series;
the three control valves for controlling the third high-pressure side pressure reducing valve are a seventh control valve, an eighth control valve and a ninth control valve, and the three control valves for controlling the fourth high-pressure side pressure reducing valve are a tenth control valve, an eleventh control valve and a twelfth control valve;
the seventh control valve and the tenth control valve form a fourth control valve group, and two pressure switches for controlling the fourth control valve group are a seventh pressure switch and a tenth pressure switch; the eighth control valve and the eleventh control valve form a fifth control valve group, and two pressure switches for controlling the fifth control valve group are an eighth pressure switch and an eleventh pressure switch; the ninth control valve and the twelfth control valve form a sixth control valve group, and two pressure switches for controlling the sixth control valve group are a ninth pressure switch and a twelfth pressure switch; the seventh pressure switch and the tenth pressure switch share one sampling pipeline, the eighth pressure switch and the eleventh pressure switch share one sampling pipeline, the ninth pressure switch and the twelfth pressure switch share one sampling pipeline, and the six pressure switches are all arranged on a main steam pipeline on the second side of the steam turbine set;
the control end of the seventh control valve and the control end of the tenth control valve are connected in parallel and then are sequentially connected with the seventh pressure switch and the tenth pressure switch in series; the control end of the eighth control valve and the control end of the eleventh control valve are connected in parallel and then are sequentially connected with the eighth pressure switch and the eleventh pressure switch in series; and the control end of the ninth control valve and the control end of the twelfth control valve are connected in parallel and then are sequentially connected with the ninth pressure switch and the twelfth pressure switch in series.
The technical problem to be solved by the present invention can be further solved by the following technical solution, wherein for the cooling and pressure reducing high pressure bypass of the steam turbine set, the bypass further comprises an analog quantity control system for controlling four high-side pressure reducing valves, 3 first pressure sensors matched with the first high-side pressure reducing valves and the second high-side pressure reducing valves, 3 second pressure sensors matched with the third high-side pressure reducing valves and the fourth high-side pressure reducing valves, and the 3 first pressure sensors and the 3 second pressure sensors are respectively installed on main steam pipelines on both sides of the first side and the second side of the steam turbine set;
the control system comprises a three-to-two logic value taking module matched with the 3 first pressure sensors, a first high-side pressure reducing valve and a second high-side pressure reducing valve, wherein the 3 first pressure sensors are all connected with the input end of the control system;
all with control system's input, the other relief pressure valve of third height and the other relief pressure valve of fourth height all are connected with control system's output, and control system includes and gets two logic value modules with 3 second pressure sensor complex three.
The utility model discloses the technical problem that will solve can also further realize through following technical scheme, to above the cooling decompression high pressure bypass of turboset, control system is the DCS system.
The utility model discloses the technical problem that will solve can also further realize through following technical scheme, to above the cooling decompression high pressure bypass of turboset, the other relief pressure valve of first high relief pressure valve, the other relief pressure valve of second height, the other relief pressure valve of third height and the other relief pressure valve of fourth height are the hydrovalve.
The utility model discloses the technical problem that will solve can also further realize through following technical scheme, to above the cooling decompression high pressure bypass of turboset, the control valve is the electromagnetism distributing valve.
Compared with the prior art, the utility model adopts a redundancy design, controls a high-side pressure reducing valve through three control valves, controls a control valve through two pressure switches, changes single-point protection into redundancy protection, and greatly improves the safety; and secondly, analog quantity protection is added on the basis of mechanical protection, and the function of double insurance is realized through logic protection of a control system. The bypass realizes the on-site switching value hard interlocking protection and analog quantity protection of the high-bypass pressure reducing valve by improving on-site hardware equipment and a control logic soft loop, thereby avoiding the misoperation of the equipment and avoiding the refusal of the equipment at the same time, and ensuring the safe and reliable operation of the turboset.
Drawings
Fig. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic diagram of a control wiring principle of the present invention;
fig. 3 is a schematic diagram of the logic principle of the control system of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-3, a cooling and pressure reducing high-pressure bypass of a steam turbine set comprises four bypass communicating pipes 1, and a first high bypass pressure reducing valve 2, a second high bypass pressure reducing valve 3, a third high bypass pressure reducing valve 16 and a fourth high bypass pressure reducing valve 29 which are respectively arranged on the four bypass communicating pipes 1, wherein the four high bypass pressure reducing valves are symmetrically arranged on the two sides of A and B, the first high bypass pressure reducing valve 2 and the third high bypass pressure reducing valve 16 are arranged on the side A, and the second high bypass pressure reducing valve 3 and the fourth high bypass pressure reducing valve 29 are arranged on the side B;
the four bypass communicating pipes 1 are also provided with a high-side desuperheating water stop valve and a high-side desuperheating water regulating valve;
the switching value hard wiring terminals of the first high-pressure side pressure reducing valve 2 and the second high-pressure side pressure reducing valve 3 are controlled to act through three control valves connected in parallel, one control valve for controlling the first high-pressure side pressure reducing valve 2 and one control valve for controlling the second high-pressure side pressure reducing valve 3 form a control valve group, each control valve group is controlled to act through two pressure switches, and each pressure switch is installed on a main steam pipeline on the first side of the steam turbine unit;
the hard wiring ends of the switching values of the third high side pressure reducing valve 16 and the fourth high side pressure reducing valve 29 are controlled to act through three control valves connected in parallel, one control valve for controlling the third high side pressure reducing valve 16 and one control valve for controlling the fourth high side pressure reducing valve 29 form a control valve group, each control valve group is controlled to act through two pressure switches, and each pressure switch is installed on a main steam pipeline on the second side of the steam turbine set.
The first high side pressure reducing valve 2 is arranged on a bypass communicating pipe 1 on the first side, and the second high side pressure reducing valve 3 is arranged on a bypass communicating pipe 1 symmetrical on the second side; the third high bypass reducing valve 16 is arranged on the other bypass communicating pipe 1 on the first side, and the fourth high bypass reducing valve 29 is arranged on the other bypass communicating pipe 1 symmetrical on the second side; the four bypass communicating pipes 1 are used for automatically opening or closing when the operating pressure of a main steam pipeline exceeds a set range, and simultaneously, the bypass communicating pipes are matched with a high bypass temperature reduction water stop valve and a high bypass temperature reduction water regulating valve to directly introduce main steam at the boiler side into a reheater after temperature reduction and pressure reduction so as to protect the safety of the reheater, and automatically regulate the pressure and the temperature according to the operating condition of a unit until the pressure and the temperature are restored to normal values; the pressure switch is arranged on the main steam pipeline and used for detecting the pressure of the main steam pipeline and controlling the action of the control valve through the action of the switch contact, namely the switch contact of the pressure switch and the control contact of the control valve are connected in series in the same circuit; the first high bypass pressure reducing valve 2 controls the action through three parallel control valves, namely each control valve can control the action of the first high bypass pressure reducing valve 2; the second high-pressure side pressure reducing valve 3 is controlled to act through three parallel control valves, namely each control valve can control the action of the second high-pressure side pressure reducing valve 3; the three control valves for controlling the first high-pressure side pressure reducing valve 2 and the three control valves for controlling the second high-pressure side pressure reducing valve 3 are in one-to-one correspondence to form three control groups, each control group is controlled in series through two pressure switches, namely, the two pressure switches are required to be operated completely, and the two control valves of the control group can be operated completely, so that the misoperation of equipment is avoided; the third high bypass pressure reducing valve 16 and the fourth high bypass pressure reducing valve 29 are controlled in the same manner as the first high bypass pressure reducing valve 2 and the second high bypass pressure reducing valve 3.
The three control valves for controlling the first high bypass reducing valve 2 are a first control valve 4, a second control valve 5 and a third control valve 6, and the three control valves for controlling the second high bypass reducing valve 3 are a fourth control valve 15, a fifth control valve 14 and a sixth control valve 13;
the first control valve 4 and the fourth control valve 10 form a first control valve group, and two pressure switches for controlling the first control valve group are a first pressure switch 7 and a fourth pressure switch 10; the second control valve 5 and the fifth control valve 11 form a second control valve group, and two pressure switches for controlling the second control valve group are a second pressure switch 8 and a fifth pressure switch 11; the third control valve 6 and the sixth control valve 12 form a third control valve group, and two pressure switches for controlling the third control valve group are a third pressure switch 9 and a sixth pressure switch 12;
the control end of the first control valve 4 and the control end of the fourth control valve 15 are connected in parallel and then are sequentially connected in series with the first pressure switch 7 and the fourth pressure switch 10; the control end of the second control valve 5 and the control end of the fifth control valve 14 are connected in parallel and then are sequentially connected in series with the second pressure switch 8 and the fifth pressure switch 11; the control end of the third control valve 6 and the control end of the sixth control valve 13 are connected in parallel and then are sequentially connected in series with the third pressure switch 9 and the sixth pressure switch 12;
the three control valves for controlling the third high bypass reducing valve 16 are a seventh control valve 19, an eighth control valve 18 and a ninth control valve 17, and the three control valves for controlling the fourth high bypass reducing valve 29 are a tenth control valve 26, an eleventh control valve 27 and a twelfth control valve 28;
the seventh control valve 19 and the tenth control valve 26 form a fourth control valve group, and two pressure switches for controlling the fourth control valve group are a seventh pressure switch 22 and a tenth pressure switch 25; the eighth control valve 18 and the eleventh control valve 27 form a fifth control valve group, and two pressure switches for controlling the fifth control valve group are an eighth pressure switch 21 and an eleventh pressure switch 24; a ninth control valve 17 and a twelfth control valve 28 form a sixth control valve group, and two pressure switches for controlling the sixth control valve group are a ninth pressure switch 20 and a twelfth pressure switch 23;
the control end of the seventh control valve 19 and the control end of the tenth control valve 26 are connected in parallel and then are sequentially connected in series with the seventh pressure switch 22 and the tenth pressure switch 25; the control end of the eighth control valve 18 and the control end of the eleventh control valve 27 are connected in parallel and then are sequentially connected in series with the eighth pressure switch 21 and the eleventh pressure switch 24; the control end of the ninth control valve 17 and the control end of the twelfth control valve 28 are connected in parallel and then are connected in series with the ninth pressure switch 20 and the twelfth pressure switch 23 in sequence.
Referring to fig. 2, the control of the first high bypass pressure reducing valve 2 and the second high bypass pressure reducing valve 3 is taken as an example, and the first high bypass pressure reducing valve 2 and the second high bypass pressure reducing valve 3 are named A, B, respectively; the first control valve 4, the second control valve 5 and the third control valve 6 are named as Y1.1, Y1.2 and Y1.3 respectively, and the switch contacts of the first control valve 4, the second control valve 5 and the third control valve 6 are named as Y1.11, Y1.21 and Y1.31; the fourth control valve 15, the fifth control valve 14 and the sixth control valve 13 are named as Y2.1, Y2.2 and Y2.3 respectively, and the switch contacts of the fourth control valve 15, the fifth control valve 14 and the sixth control valve 13 are named as Y2.11, Y2.21 and Y2.31 respectively; the first pressure switch 7, the second pressure switch 8, the third pressure switch 9, the fourth pressure switch 10, the fifth pressure switch 11 and the sixth pressure switch 12 are named as K1, K2, K3, K11, K21 and K31 respectively;
when the control valve is not electrified, Y1.11, Y1.21, Y1.31, Y2.11, Y2.21 and Y2.31 are all normally closed contacts, and when the control valve is electrified, the normally closed contacts are normally open contacts;
when the pressure switch K1 is actuated, the control valves Y1.1 and Y2.1 are not actuated; when the pressure switches K1 and K11 are both actuated, the control valves Y1.1 and Y2.1 are actuated, and the high-side pressure reducing valve A, B is slowly opened; similarly, when both K2 and K21 act, control valves Y1.2 and Y2.2 act, and high-side pressure reducing valve A, B opens slowly, and when both K3 and K31 act, control valves Y1.3 and Y2.3 act, and high-side pressure reducing valve A, B opens slowly; when the multiple groups of pressure switches act, the corresponding control valves act, and the high-side pressure reducing valve A, B is quickly opened, so that the speed control of the action of the high-side pressure reducing valve is realized, and the protection effect of taking two out of two is also realized.
The control of the third high bypass pressure reducing valve 16 and the fourth high bypass pressure reducing valve 29 is identical to the control of the first high bypass pressure reducing valve 2 and the second high bypass pressure reducing valve 3.
Referring to fig. 3, the bypass further includes an analog quantity control system for controlling four high-pressure side pressure reducing valves, 3 first pressure sensors cooperating with the first high-pressure side pressure reducing valve 2 and the second high-pressure side pressure reducing valve 3, 3 second pressure sensors cooperating with the third high-pressure side pressure reducing valve 16 and the fourth high-pressure side pressure reducing valve 29, and the 3 first pressure sensors and the 3 second pressure sensors are respectively installed on main steam pipelines on both sides of a first steam pipeline and a second steam pipeline of the steam turbine set;
the 3 first pressure sensors are all connected with the input end of the control system, the first high-pressure side pressure reducing valve 2 and the second high-pressure side pressure reducing valve 3 are all connected with the output end of the control system, and the control system comprises a two-out-of-three logic value taking module matched with the 3 first pressure sensors;
all with control system's input, the other relief pressure valve 16 of third height and the other relief pressure valve 29 of fourth height all are connected with control system's output, and control system includes and gets two logical value modules with 3 second pressure sensor complex three.
The control system receives detection signals of the 3 first pressure sensors, limit judgment is firstly carried out on analog quantity signals of the 3 first pressure sensors through logic judgment, then two-out-of-three processing is carried out, and finally a main contact signal is provided by an output relay and is used for controlling the actions of the first high-side pressure reducing valve 2 and the second high-side pressure reducing valve 3 to realize logic protection of the control system, wherein the two-out-of-three logic value taking module refers to a program module which is realized by the control system through an algorithm;
the control system receives detection signals of the 3 second pressure sensors, limit judgment is firstly carried out on analog quantity signals of the 3 second pressure sensors through logic judgment, then two-out-of-three processing is carried out, and finally a dry contact signal is provided by an output relay and is used for controlling the actions of the third high-side pressure reducing valve 16 and the fourth high-side pressure reducing valve 29 to realize logic protection of the control system, wherein the two-out-of-three logic value taking module refers to a program module which is realized by the control system through an algorithm;
the work does not need to change the internal hard wiring of the high-pressure bypass system, only needs to modify the logic configuration of the control system, lays the control system to the long cable of the instrument box of the high-side pressure switch of the machine room, and the control is the high-side system protection which is parallel to the two redundant controls of the pressure switch of the high-side system on site, thereby not only preventing the single pressure switch from misoperation, but also increasing the analog protection function.
The control system is a DCS system, the DCS system is a multistage computer system which is composed of a process control level and a process monitoring level and takes a communication network as a link, 4C technologies such as computers, communication, display (CRT), control and the like are integrated, and the control system has the basic idea of decentralized control, centralized operation, hierarchical management, flexible configuration and convenient configuration.
The first high-pressure side pressure reducing valve 2, the second high-pressure side pressure reducing valve 3, the third high-pressure side pressure reducing valve 16 and the fourth high-pressure side pressure reducing valve 29 are all hydraulic valves; and the control valves for controlling the first high-pressure side pressure reducing valve 2, the second high-pressure side pressure reducing valve 3, the third high-pressure side pressure reducing valve 16 and the fourth high-pressure side pressure reducing valve 29 are all electromagnetic pressure distribution valves. The hydraulic valve is an automatic element operated by pressure oil, is controlled by the pressure oil of a distribution valve, is usually combined with an electromagnetic distribution valve for use, and can be used for remotely controlling the connection and disconnection of oil, gas and water pipeline systems of hydropower stations; the utility model provides a hydrovalve is controlled through three parallelly connected electromagnetism distributing valve, the oil inlet pipeline of a hydrovalve includes three branch road promptly, three electromagnetism distributing valve is installed respectively on three branch road, arbitrary electromagnetism distributing valve opens, all can drive the hydrovalve action, the number of solenoid valve action at every turn is more, the speed that the hydrovalve was opened is faster, take the other relief pressure valve 2 of first height as an example, the whole actions of three control valve of the other relief pressure valve 2 of first height of control, the speed of the other relief pressure valve 2 action of first height of control is the fastest, realize opening fast, satisfy this condition, it must all actions of six pressure switch must be.
The other relief pressure valve of height, control valve, pressure switch that this application adopted are the other relief pressure valve of height, control valve, pressure switch among the prior art, and the aim at of this application provides a control structure of controlling the other relief pressure valve of height, avoids the condition of the other relief pressure valve malfunction of height and refusing, guarantees whole turboset safety and stability and moves.
Claims (6)
1. The utility model provides a turbine unit's cooling decompression high pressure bypass which characterized in that: the bypass comprises four bypass communicating pipes and a first high bypass pressure reducing valve, a second high bypass pressure reducing valve, a third high bypass pressure reducing valve and a fourth high bypass pressure reducing valve which are respectively arranged on the four bypass communicating pipes, wherein the four high bypass pressure reducing valves are symmetrically arranged on two sides of A and B, the first high bypass pressure reducing valve and the third high bypass pressure reducing valve are arranged on the A side, and the second high bypass pressure reducing valve and the fourth high bypass pressure reducing valve are arranged on the B side;
the switching value hard wiring terminals of the first high-pressure side pressure reducing valve and the second high-pressure side pressure reducing valve are controlled to act through three control valves connected in parallel, one control valve for controlling the first high-pressure side pressure reducing valve and one control valve for controlling the second high-pressure side pressure reducing valve form a control valve group, each control valve group is controlled to act through two pressure switches, and each pressure switch is installed on a main steam pipeline on the first side of the steam turbine unit;
the other relief pressure valve of third height and the other relief pressure valve switching value of fourth height are connected hard wiring end and are all controlled the action through three control valve that connect in parallel, and a control valve group is constituteed to the other relief pressure valve of a control third height and the control valve of the other relief pressure valve of a control fourth height, and every control valve group all controls the action through two pressure switch, and every pressure switch all installs on the second side main steam pipe way of turboset.
2. The turbine assembly temperature and pressure reduction high-pressure bypass according to claim 1, characterized in that: the three control valves for controlling the first high bypass pressure reducing valve are a first control valve, a second control valve and a third control valve, and the three control valves for controlling the second high bypass pressure reducing valve are a fourth control valve, a fifth control valve and a sixth control valve;
the first control valve and the fourth control valve form a first control valve group, and two pressure switches for controlling the first control valve group are a first pressure switch and a fourth pressure switch; the second control valve and the fifth control valve form a second control valve group, and two pressure switches for controlling the second control valve group are a second pressure switch and a fifth pressure switch; the third control valve and the sixth control valve form a third control valve group, and two pressure switches for controlling the third control valve group are a third pressure switch and a sixth pressure switch;
the control end of the first control valve and the control end of the fourth control valve are connected in parallel and then are sequentially connected with the first pressure switch and the fourth pressure switch in series; the control end of the second control valve and the control end of the fifth control valve are connected in parallel and then are sequentially connected with the second pressure switch and the fifth pressure switch in series; the control end of the third control valve and the control end of the sixth control valve are connected in parallel and then are sequentially connected with the third pressure switch and the sixth pressure switch in series;
the three control valves for controlling the third high-pressure side pressure reducing valve are a seventh control valve, an eighth control valve and a ninth control valve, and the three control valves for controlling the fourth high-pressure side pressure reducing valve are a tenth control valve, an eleventh control valve and a twelfth control valve;
the seventh control valve and the tenth control valve form a fourth control valve group, and two pressure switches for controlling the fourth control valve group are a seventh pressure switch and a tenth pressure switch; the eighth control valve and the eleventh control valve form a fifth control valve group, and two pressure switches for controlling the fifth control valve group are an eighth pressure switch and an eleventh pressure switch; the ninth control valve and the twelfth control valve form a sixth control valve group, and two pressure switches for controlling the sixth control valve group are a ninth pressure switch and a twelfth pressure switch;
the control end of the seventh control valve and the control end of the tenth control valve are connected in parallel and then are sequentially connected with the seventh pressure switch and the tenth pressure switch in series; the control end of the eighth control valve and the control end of the eleventh control valve are connected in parallel and then are sequentially connected with the eighth pressure switch and the eleventh pressure switch in series; and the control end of the ninth control valve and the control end of the twelfth control valve are connected in parallel and then are sequentially connected with the ninth pressure switch and the twelfth pressure switch in series.
3. The turbine assembly temperature and pressure reduction high-pressure bypass according to claim 1, characterized in that: the bypass also comprises an analog quantity control system for controlling the four high bypass pressure reducing valves, 3 first pressure sensors matched with the first high bypass pressure reducing valve and the second high bypass pressure reducing valve, 3 second pressure sensors matched with the third high bypass pressure reducing valve and the fourth high bypass pressure reducing valve, and the 3 first pressure sensors and the 3 second pressure sensors are respectively arranged on main steam pipelines on two sides of a first steam turbine and a second steam turbine of the steam turbine set;
the control system comprises a three-to-two logic value taking module matched with the 3 first pressure sensors, a first high-side pressure reducing valve and a second high-side pressure reducing valve, wherein the 3 first pressure sensors are all connected with the input end of the control system;
all with control system's input, the other relief pressure valve of third height and the other relief pressure valve of fourth height all are connected with control system's output, and control system includes and gets two logic value modules with 3 second pressure sensor complex three.
4. The turbine assembly temperature and pressure reduction high-pressure bypass according to claim 3, characterized in that: the control system is a DCS system.
5. The turbine assembly temperature and pressure reduction high-pressure bypass according to claim 1, characterized in that: the first high-pressure side pressure reducing valve, the second high-pressure side pressure reducing valve, the third high-pressure side pressure reducing valve and the fourth high-pressure side pressure reducing valve are all hydraulic valves.
6. The turbine assembly temperature and pressure reduction high-pressure bypass according to claim 5, characterized in that: the control valves are all electromagnetic pressure distributing valves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920984004.6U CN210068247U (en) | 2019-06-27 | 2019-06-27 | Cooling and pressure reducing high-pressure bypass of steam turbine unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920984004.6U CN210068247U (en) | 2019-06-27 | 2019-06-27 | Cooling and pressure reducing high-pressure bypass of steam turbine unit |
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| CN210068247U true CN210068247U (en) | 2020-02-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112629155A (en) * | 2020-12-21 | 2021-04-09 | 江苏中伟机械制造有限公司 | Safe type cooling pressure relief device |
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2019
- 2019-06-27 CN CN201920984004.6U patent/CN210068247U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112629155A (en) * | 2020-12-21 | 2021-04-09 | 江苏中伟机械制造有限公司 | Safe type cooling pressure relief device |
| CN112629155B (en) * | 2020-12-21 | 2022-05-24 | 江苏中伟机械制造有限公司 | Safe type cooling pressure relief device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A high pressure bypass for temperature and pressure reduction of steam turbine unit Effective date of registration: 20210629 Granted publication date: 20200214 Pledgee: Bank of China Limited Lianyungang Haizhou Branch Pledgor: JIANGSU XINHAI POWER GENERATION Co.,Ltd. Registration number: Y2021980005515 |