阅读说明：本技术 一种汽轮机给水泵的高低压油路安全保护系统 (High-low pressure oil circuit safety protection system of steam turbine feed pump ) 是由 李辉 金国强 安朝榕 张振伟 王辰昱 宋国鹏 沈乾坤 于 2020-07-10 设计创作，主要内容包括：本发明公开了一种汽轮机给水泵的高低压油路安全保护系统,高压安全油路上安装有带串并联的四个电磁阀；低压安全油路上安装有两个并联带电跳汽轮机给水泵电磁阀；高压安全油管路新增加高压安全油管路压力变送器,并接入DCS控制系统用于监视；还包括增加三个压力开关,设定三取二逻辑后接入汽轮机给水泵危急遮断系统。解决了汽轮机原有高压安全油管路和低压安全油管路各有一只跳闸电磁阀,任意一个跳闸电磁阀损坏均会造成汽轮机给水泵误跳,发生停运事故的问题。本发明提供的保护系统结构设置合理,安全可靠,极大降低了电磁阀故障导致机组非正常停机的概率,同时增加了高压安全油管路压力变送器方便及时发现故障电磁阀,利于维修和更换。(The invention discloses a high-low pressure oil circuit safety protection system of a steam turbine feed pump, wherein four electromagnetic valves with series-parallel connection are arranged on a high-pressure safety oil circuit; two parallel-connected water supply pump electromagnetic valves with electric jump turbines are arranged on the low-voltage safety oil circuit; a pressure transmitter of the high-pressure safety oil pipeline is added to the high-pressure safety oil pipeline and is connected into a DCS (distributed control system) for monitoring; the method also comprises the steps of adding three pressure switches, setting a three-to-two logic and then connecting the three-to-two logic to a critical interruption system of the steam turbine feed pump. The problem of the original high pressure safety oil pipe way of steam turbine and low pressure safety oil pipe way respectively have a tripping operation solenoid valve, any tripping operation solenoid valve damage all can cause the steam turbine feed pump to jump by mistake, takes place the outage accident is solved. The protection system provided by the invention is reasonable in structural arrangement, safe and reliable, greatly reduces the probability of abnormal shutdown of the unit caused by failure of the electromagnetic valve, and increases the pressure transmitter of the high-pressure safety oil pipeline, so that the failed electromagnetic valve can be conveniently and timely found, and the maintenance and the replacement are facilitated.)

1. The high-low pressure oil circuit safety protection system of the turbine feed pump is characterized by comprising a high-pressure safety oil circuit (15) and a low-pressure safety oil circuit (14), wherein outlets of the high-pressure safety oil circuit (15) and the low-pressure safety oil circuit (14) are connected with a host EH oil tank;

the high-pressure safety oil way (15) comprises four channels, inlets of the four channels are communicated with high-pressure safety oil, and outlets of the four channels are connected with the EH oil tank of the main machine; the first channel is provided with a first pressure display meter (10), the second channel is formed by connecting a first electromagnetic valve (1) and a third electromagnetic valve (3) in parallel, the third channel is formed by connecting a second electromagnetic valve (2) and a fourth electromagnetic valve (4) in parallel, and the fourth channel is provided with a sampling port;

the low-pressure safety oil way (14) is a channel formed by connecting a fifth electromagnetic valve (5) and a sixth electromagnetic valve (6) in parallel, the inlet of the channel is communicated with high-pressure safety oil, and the outlet of the channel is connected with an EH oil tank of the host machine;

a first electromagnetic valve (1), a second electromagnetic valve (2), a third electromagnetic valve (3) and a fourth electromagnetic valve (4) are mounted on the high-pressure safety oil way (15), the first electromagnetic valve (1) and the third electromagnetic valve (3) are connected in parallel to form a first channel, the second electromagnetic valve (2) and the fourth electromagnetic valve (4) are connected in parallel to form a second channel, the first channel and the second channel are connected in series, the inlet of the first channel is communicated with high-pressure safety oil, and the outlet of the second channel is connected with an EH oil tank of the host;

a fifth electromagnetic valve (5) and a sixth electromagnetic valve (6) are mounted on the low-pressure safety oil way (14), the fifth electromagnetic valve (5) and the sixth electromagnetic valve (6) are connected in parallel to form a third channel, the inlet of the third channel is communicated with low-pressure safety oil, and the outlet of the third channel is connected with an EH oil tank of the host; the fifth electromagnetic valve (5) and the sixth electromagnetic valve (6) are electromagnetic valves with trip turbine feed water pumps.

2. The high-low pressure oil circuit safety protection system of the steam turbine feed water pump is characterized by further comprising a first pressure switch (7), a second pressure switch (8) and a third pressure switch (9) which are connected in parallel, wherein the first pressure switch (7), the second pressure switch (8) and the third pressure switch (9) are connected to the inlet of the first channel.

3. The high-low pressure oil circuit safety protection system of the steam turbine feed water pump according to claim 2, characterized in that the setting values of the first pressure switch (7), the second pressure switch (8) and the third pressure switch (9) are all 6.89 MPa.

4. The high-low pressure oil circuit safety protection system of the steam turbine feed water pump is characterized in that the high-pressure safety oil circuit (14) further comprises a pressure transmitter (16) arranged at the outlet of the first channel and a first pressure display meter (10) connected with the first channel in parallel.

5. The high-low pressure oil path safety protection system of a steam turbine feed water pump according to claim 1, characterized by further comprising a high-pressure anti-combustion oil path (13) which is safely monitored by the high-pressure safety oil path (15) and the low-pressure safety oil path (14).

6. The high-low pressure oil circuit safety protection system of the steam turbine feed water pump is characterized in that a second pressure display meter (11) and a fourth pressure switch (12) are installed on a main pipe of the high-pressure anti-combustion oil circuit.

7. The high-low pressure oil circuit safety protection system of the steam turbine feed water pump is characterized in that coil voltages of the first solenoid valve (1) to the sixth solenoid valve (6) are all 220 VDC.

Technical Field

The invention relates to the technical field of a turbine water feeding pump, in particular to a high-low pressure oil way safety protection system of a turbine water feeding pump.

Background

The steam turbine water-feeding pump that the steam turbine was equipped with generally is equipped with two and loses the electricity and jumps steam turbine water-feeding pump solenoid valve, including high-pressure safety oil solenoid valve and low pressure safety oil solenoid valve, when the steam turbine takes place different shut down faults, makes low pressure safety oil solenoid valve, high pressure safety oil solenoid valve action jump steam turbine water-feeding pump through steam turbine water-feeding pump emergency interruption system, and arbitrary electromagnetic action can all lead to the unit to trip, and two solenoid valves belong to long electrified, lose the electricity and trip, consequently because the solenoid valve trouble leads to the probability greatly increased that the unit normally shut down. The design is easy to cause the false tripping of the turbine water feeding pump due to the damage or the fault of the electromagnetic valve, has larger safety risk, and causes the accidents of the shutdown of the turbine water feeding pump due to the burnout of the low-pressure safety oil electromagnetic valve or the high-pressure safety oil electromagnetic valve and the fault in the same type of turbine water feeding pump for many times.

Disclosure of Invention

The invention aims to solve the problem that a high-low pressure safety oil electromagnetic valve in a steam turbine feed pump is easy to burn out to cause faults, and provides a high-low pressure oil way safety protection system of the steam turbine feed pump.

In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:

a high-low pressure oil circuit safety protection system of a turbine feed pump comprises a high-pressure safety oil circuit and a low-pressure safety oil circuit, wherein outlets of the high-pressure safety oil circuit and the low-pressure safety oil circuit are connected with a host EH oil tank;

the high-pressure safety oil way comprises four channels, inlets of the four channels are communicated with high-pressure safety oil, and outlets of the four channels are connected with the EH oil tank of the main machine; the first channel is provided with a first pressure display meter, the second channel is formed by connecting a first electromagnetic valve and a third electromagnetic valve in parallel, the third channel is formed by connecting a second electromagnetic valve and a fourth electromagnetic valve in parallel, and the fourth channel is provided with a sampling port;

the low-pressure safety oil way is a channel formed by connecting a fifth electromagnetic valve and a sixth electromagnetic valve in parallel, the inlet of the channel is communicated with high-pressure safety oil, and the outlet of the channel is connected with an EH oil tank of the host machine;

the high-pressure safety oil way is provided with a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve and a fourth electromagnetic valve, the first electromagnetic valve and the third electromagnetic valve are connected in parallel to form a first channel, the second electromagnetic valve and the fourth electromagnetic valve are connected in parallel to form a second channel, the first channel is connected with the second channel in series, the inlet of the first channel is communicated with high-pressure safety oil, and the outlet of the second channel is connected with an EH oil tank of the host machine;

a fifth electromagnetic valve and a sixth electromagnetic valve are installed on the low-pressure safety oil path and are connected in parallel to form a third channel, the inlet of the third channel is communicated with low-pressure safety oil, and the outlet of the third channel is connected with an EH oil tank of the host machine; the fifth electromagnetic valve and the sixth electromagnetic valve are electromagnetic valves with trip turbine feed pumps.

The invention further improves the following steps:

the first pressure switch, the second pressure switch and the third pressure switch are connected in parallel, and are connected to the inlet of the first channel.

Setting values of the first pressure switch, the second pressure switch and the third pressure switch are all 6.89 MPa.

The high-pressure safety oil circuit also comprises a pressure transmitter arranged at the outlet of the first channel and a first pressure display meter connected with the first channel in parallel.

The high-pressure anti-combustion oil way is monitored safely by the high-pressure safety oil way and the low-pressure safety oil way.

And a second pressure display meter and a fourth pressure switch are arranged on a main pipe of the high-pressure anti-combustion oil way.

The coil voltages of the first solenoid valve to the sixth solenoid valve are all 220 VDC.

Compared with the prior art, the invention has the following beneficial effects:

the invention relates to a high-low pressure oil circuit safety protection system of a steam turbine feed pump.A first electromagnetic valve and a third electromagnetic valve on a high-pressure safety oil circuit are connected in parallel to form a group, a second electromagnetic valve and a fourth electromagnetic valve are connected in parallel to form a group, when one electromagnetic valve of the group fails, the feed pump cannot be tripped, and can still continue to operate; the low-voltage safety oil circuit is provided with a fifth electromagnetic valve and a sixth electromagnetic valve which are connected in parallel and are driven by a newly added relay output, so long as any one electromagnetic valve normally acts, the electromagnetic valve can be ensured to act in a charged mode after a steam turbine water feeding pump signal is triggered, the low-voltage safety oil is decompressed, the steam turbine water feeding pump is normally stopped, and the operation safety of the steam turbine water feeding pump is improved; the low-voltage safety oil electromagnetic valve is changed into an electrified jump steam turbine water feeding pump, so that the phenomenon that the electromagnetic valve generates heat in a long-term electrified mode to cause the burning of an electromagnetic valve coil is avoided.

Furthermore, the safety protection system for the high-low pressure oil circuit is provided with three water supply pump pressure switches, signals are sent to the emergency trip system of the water supply pump of the steam turbine, and the signals are used as trip signals and hanging brake signals of the emergency trip system of the water supply pump of the steam turbine after two-out-of-three logic. And a manual brake-opening button on an on-site instrument box of the steam turbine feed pump is connected to a hard-wired loop of a trip electromagnetic valve of the steam turbine feed pump.

Furthermore, the pressure transmitter is additionally arranged on the high-pressure safety oil pipeline and used for monitoring the pressure of the high-pressure oil pipeline, so that the electromagnetic valve with a fault can be conveniently found and replaced in time.

Drawings

FIG. 1 is a schematic diagram of a high-low pressure oil circuit safety protection system of a steam turbine feed water pump.

Wherein: 1-a first solenoid valve; 2-a second solenoid valve; 3-a third electromagnetic valve; 4-a fourth solenoid valve; 5-a fifth electromagnetic valve; 6-a sixth electromagnetic valve; 7-a first pressure switch; 8-a second pressure switch; 9-a third pressure switch; 10-first pressure display gauge; 11-a second pressure display gauge; 12-a fourth pressure switch; 13-high pressure anti-combustion oil circuit; 14-low pressure safety oil circuit; 15-high pressure safety oil circuit; 16-a pressure transmitter; 17-diaphragm valve.

Detailed Description

The invention is further illustrated below with reference to examples and figures:

as shown in fig. 1, the invention provides a high-low pressure oil circuit safety protection system of a turbine feed pump, which comprises a high-pressure safety oil circuit 15 and a low-pressure safety oil circuit 14, wherein outlets of the high-pressure safety oil circuit 15 and the low-pressure safety oil circuit 14 are connected with a main engine EH oil tank;

a first electromagnetic valve 1, a second electromagnetic valve 2, a third electromagnetic valve 3 and a fourth electromagnetic valve 4 are installed on the high-pressure safety oil path 15, the first electromagnetic valve 1 and the third electromagnetic valve 3 are connected in parallel to form a channel, the second electromagnetic valve 2 and the fourth electromagnetic valve 4 are connected in parallel to form a channel, one end of each of the two channels after being connected in series is communicated with high-pressure safety oil, and the other end of each of the two channels is connected with an EH oil tank of the host; the high-pressure relief oil circuit 15 is also provided with a pressure transmitter 16 and a first pressure display gauge 10.

The low-pressure safety oil way 14 is provided with a fifth electromagnetic valve 5 and a sixth electromagnetic valve 6, the fifth electromagnetic valve 5 and the sixth electromagnetic valve 6 are connected in parallel to form a channel, one end of the channel is communicated with low-pressure safety oil, and the other end of the channel is connected with an EH oil tank of the host; the fifth electromagnetic valve 5 and the sixth electromagnetic valve 6 are electromagnetic valves with trip turbine feed water pumps. The low-pressure relief oil passage 14 is also connected to the high-pressure relief oil passage 15 through a diaphragm valve 17.

The high-low pressure oil circuit safety protection system further comprises a first pressure switch 7, a second pressure switch 8 and a third pressure switch 9 which are connected in parallel. The setting values of the first pressure switch 7, the second pressure switch 8 and the third pressure switch 9 are all 6.89 MPa. And sending the signals to a turbine water supply pump emergency trip system, and taking the signals as trip signals and hanging brake signals of the turbine water supply pump emergency trip system after performing two-out-of-three logic. And a manual brake-opening button on an on-site instrument box of the steam turbine feed pump is connected to a hard-wired loop of a trip electromagnetic valve of the steam turbine feed pump.

The high-low pressure oil way safety protection system further comprises a high-pressure anti-combustion oil way 13, and a second pressure display meter 11 and a fourth pressure switch 12 are mounted on the high-pressure anti-combustion oil way 13. The coil voltages of the first to sixth solenoid valves 1 to 6 are all 220 VDC.

The working principle of the invention is as follows:

when the high-low pressure oil circuit safety protection system of the steam turbine water feeding pump protected by the invention operates, a power supply is connected out from a control relay of a steam turbine water feeding pump emergency interruption system, four electromagnetic valves are controlled simultaneously, the single electromagnetic valve fails to act and pressure relief cannot be caused, the first electromagnetic valve 1 or the third electromagnetic valve 3 acts, the second electromagnetic valve 2 or the fourth electromagnetic valve 4 acts, oil can be drained from the whole module, and the probability of system failure is extremely low.

The high-pressure safety oil pipeline pressure transmitter 16 designed by the system is used for monitoring the pressure of the high-pressure oil pipeline, and when a monitoring person operates the water-feeding pump steam turbine during operation, the monitoring person finds that the pressure of the pressure transmitter 16 is high and gives an alarm, so that the first electromagnetic valve 1 or the third electromagnetic valve 3 has fault oil drainage, and at the moment, a maintainer is contacted to check the first electromagnetic valve 1 or the third electromagnetic valve 3 as soon as possible, find out the fault electromagnetic valve and the system is recovered to be normal after the fault electromagnetic valve is; when the pressure transmitter 16 gives an alarm when the pressure is low, it is indicated that the second electromagnetic valve 2 or the fourth electromagnetic valve 4 has a fault to drain oil, and at this time, a maintainer is contacted to check the second electromagnetic valve 2 or the fourth electromagnetic valve 4 as soon as possible, find out the faulty electromagnetic valve and restore the system to be normal after the faulty electromagnetic valve is replaced.

In order to further ensure the safe operation of the water supply pump steam turbine, the low-pressure safety oil is changed into two parallelly-connected electrified acting fifth electromagnetic valves 5 and sixth electromagnetic valves 6, and the electromagnetic valves are closed when the electromagnetic valves are in power failure during normal operation, so that the failure rate of the coil of the electromagnetic valve during burning is greatly reduced. When the water supply pump turbine stops running, the trip signal triggers the relay to enable the electromagnetic valve to be electrified to act, the low-voltage safety oil loses voltage, the steam turbine water supply pump hanging brake signal in the DEH disappears, and the unit is interrupted. Because the solenoid valve design is electrified for 1 minute, and 1 minute back solenoid valve loses the electricity and closes, emergency breaker and resetting means opened the draining passageway this moment, and the unit interdiction, even the power failure of low pressure safety oil solenoid valve closes, safe oil still can not establish, has guaranteed to feed pump steam turbine safety shutdown.

The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.