CN112240230A - Low-position-arranged combined cycle unit drainage system and operation method - Google Patents

Low-position-arranged combined cycle unit drainage system and operation method Download PDF

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Publication number
CN112240230A
CN112240230A CN202011234710.2A CN202011234710A CN112240230A CN 112240230 A CN112240230 A CN 112240230A CN 202011234710 A CN202011234710 A CN 202011234710A CN 112240230 A CN112240230 A CN 112240230A
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China
Prior art keywords
hydrophobic
pressure
pipe
drain
drainage
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蔺奕存
廖军林
郭云飞
高景辉
张臣
陈余土
宋晓辉
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Xian Thermal Power Research Institute Co Ltd
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Xian Thermal Power Research Institute Co Ltd
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Priority to CN202011234710.2A priority Critical patent/CN112240230A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/32—Collecting of condensation water; Drainage ; Removing solid particles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/30—Exhaust heads, chambers, or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K9/00—Plants characterised by condensers arranged or modified to co-operate with the engines

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)

Abstract

一种低位布置的联合循环机组疏水系统及运行方法，包括低压疏水管和高压疏水管，所述低压疏水管的输出端通过低压疏水集管连接低压疏水扩容器，高压疏水管输出端通过高压疏水集管连接高压疏水扩容器，所述疏水扩容器顶部设置有排汽管道，排汽管道用于排出疏水扩容器内部的蒸汽，排汽管道的输出端连接凝汽器；所述疏水扩容器侧面设置有疏水扩容器减温水管道，疏水扩容器减温水管道用于向疏水扩容器内喷入减温水，所述疏水扩容器底部的凝结水输出端通过疏水排水管连接凝汽器热井。本发明可以提升低位布置的联合循环发电机组在运行过程中汽轮机疏水系统的可靠性。

Figure 202011234710

A combined cycle unit drainage system and operation method arranged at a low position, comprising a low-pressure drainage pipe and a high-pressure drainage pipe, an output end of the low-pressure drainage pipe is connected to a low-pressure drainage expansion vessel through a low-pressure drainage header, and an output end of the high-pressure drainage pipe is connected through a high-pressure drainage pipe. The header is connected to the high-pressure hydrophobic expansion vessel, the top of the hydrophobic expansion vessel is provided with a steam exhaust pipe, the steam exhaust pipe is used to discharge the steam inside the hydrophobic expansion vessel, and the output end of the exhaust steam pipe is connected to the condenser; the side surface of the hydrophobic expansion vessel The hydrophobic expansion container desuperheating water pipeline is provided, and the hydrophobic expansion container desuperheating water pipeline is used to spray desuperheating water into the hydrophobic expansion container. The invention can improve the reliability of the steam turbine drainage system during the operation of the combined cycle generator set arranged at a low position.

Figure 202011234710

Description

Low-position-arranged combined cycle unit drainage system and operation method
Technical Field
The invention relates to the technical field of hydrophobic cycle recycling of power plants, in particular to a combined cycle unit hydrophobic system arranged at a low position and an operation method.
Background
Along with the increase of the installed capacity of the domestic gas-steam combined cycle power generating unit, part of plants can adopt a low-level arrangement structure during design, the design provides convenience for unit installation and maintenance work, and the amount investment of a combined cycle power plant is reduced. Panhua et al in chinese patent 201410832031.3 disclose a combined plant low-level layout structure of a multi-shaft combined cycle thermal power generating unit, which reduces the floor space and volume of the main plant and facilitates the installation and maintenance of the unit. However, the patent does not relate to the operation method of the unit system and the specific arrangement mode of the system.
The design of the drainage system of the steam turbine has direct influence on the economy and the safety of unit operation, and the plant design of the low-level arrangement structure enables the drainage flash tank part to be below 0 meter in the plant, so that the reasonable drainage recovery method and the control mode are favorable for improving the reliability of unit operation.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a combined cycle unit drainage system arranged at a low position and an operation method thereof, so that the economical efficiency and the safety of the steam turbine drainage system in the use process when a factory building is arranged at the low position are improved.
In order to achieve the purpose, the invention adopts the technical scheme that:
a combined cycle unit drainage system arranged at a low position comprises a low-pressure drainage pipe 2 and a high-pressure drainage pipe 13, wherein the output end of the low-pressure drainage pipe 2 is connected with a low-pressure drainage flash tank 5 through a low-pressure drainage collecting pipe 1, the output end of the high-pressure drainage pipe 13 is connected with a high-pressure drainage flash tank 6 through a high-pressure drainage collecting pipe 14, a steam exhaust pipeline 4 is arranged at the top of the drainage flash tank, the steam exhaust pipeline 4 is used for exhausting steam in the drainage flash tank, and the output end of the steam exhaust pipeline 4 is connected with a condenser 11;
the side of the hydrophobic flash tank is provided with a hydrophobic flash tank desuperheating water pipeline 3, the hydrophobic flash tank desuperheating water pipeline 3 is used for spraying desuperheating water into the hydrophobic flash tank, and a condensed water output end at the bottom of the hydrophobic flash tank is connected with a condenser hot well 12 through a hydrophobic drain pipe 9.
And an overflow pipeline 7 is arranged at the middle lower part of the side edge of the drainage drain pipe 9, and a drainage flash tank liquid level meter 15 is arranged at the side edge of the drainage flash tank.
And a check valve is arranged on the drainage flash tank overflow pipeline 7, and an outlet of the drainage flash tank overflow pipeline is connected to a condenser hot well 12.
The drain flash tank liquid level meter 15 is designed with two remote transmission type guided wave radar liquid level meters and an in-situ magnetic turning plate liquid level meter.
The steam exhaust pipeline 4 is divided into a steam exhaust pipeline 4 of a high-pressure hydrophobic flash tank 6 and a steam exhaust pipeline 4 of a low-pressure hydrophobic flash tank 5.
An electric valve and a check valve are arranged on the steam exhaust pipeline 4, and an outlet of the electric valve is connected with the throat part of the condenser 11.
The drain flash tank is divided into a high-pressure drain flash tank 6 and a low-pressure drain flash tank 5, the high-pressure drain flash tank 6 and the low-pressure drain flash tank are respectively used for receiving the high-pressure level drain water and the low-pressure level drain water of the unit in the operation process, the high-pressure drain flash tank 6 and the low-pressure drain flash tank 5 are independently and separately arranged, and the pipeline connection modes are the same.
The drain headers are divided into a high pressure drain header 14 and a low pressure drain header 1, and drain pipes after pressure classification are connected to the high pressure drain header 14 and the low pressure drain header 1, respectively, by pressure classification of drain.
The drain pipe 9 is divided into two branches after a main pipe is led out from the bottom of the drain flash tank, a drain pump 8, an electric valve and a check valve are respectively arranged on each branch, and the tail end of the pipeline of the drain pipe 9 is connected with a condenser hot well 12.
The main pipe of the drainage pipe 9 is connected with a sewage pipeline 10, the sewage pipeline 10 is provided with an electric door and a manual valve, and the tail end of the sewage pipeline 10 is connected to a condensed water pump pit.
The operation mode of the combined cycle unit drainage system arranged at a low position comprises the following steps;
in the operation process of the steam turbine, the drainage after pressure classification flows into a low-pressure drainage collecting pipe 1 and a high-pressure drainage collecting pipe 14 through a low-pressure drainage pipe 2 and a high-pressure drainage pipe 13 respectively, after the drainage reaches a low-pressure drainage flash tank 5 and a high-pressure drainage flash tank 6, after the processes of temperature reduction, pressure reduction and flash tank expansion are carried out in the drainage flash tank, part of steam generated after flash tank expansion enters a condenser 11 through a steam exhaust pipeline 4 connected to the top of the drainage flash tank for recondensation, so that working media are recovered;
a drain flash tank temperature-reducing water pipeline 3 arranged at the upper part of the side edge of the drain flash tank sprays temperature-reducing water into the drain flash tank, so that steam in the drain flash tank is better condensed, the temperature of condensed water in the drain flash tank is controlled, and the condensed water condensed in the drain flash tank is discharged into a condenser hot well 12 at the bottom of the drain flash tank through a corresponding drain water pipe 9;
the drain flash tank liquid level meter 15 is used for monitoring the condensate water liquid level of the drain flash tank, so that the condensate water in the drain flash tank is timely discharged through the drain pump 8, and the liquid level scores are three, namely two remote transmission type guided wave radar liquid level meters and a local magnetic turning plate liquid level meter;
when the liquid level of the condensed water in the drainage flash tank reaches a high I-position alarm value, one drainage pump 8 on a pipeline of a drainage drain pipe 9 is automatically started, the condensed water of the drainage flash tank is pumped into a condenser hot well 12, when the liquid level of the condensed water in the drainage flash tank rises and reaches a high II-position alarm value, the other drainage pump 8 is automatically started in a linked mode, and after the liquid level of the condensed water in the drainage flash tank is kept at a normal value, the two drainage pumps 8 are sequentially stopped;
when the two drainage pumps 8 are started, the liquid level of the drainage flash tank continues to rise, and the overflow pipeline 7 can enable condensed water in the drainage flash tank to overflow to the condenser hot well 12;
when the unit is in the shutdown maintenance stage, the condensed water in the drainage flash tank is completely discharged through the drainage pipeline 10 arranged at the bottom of the drainage flash tank, so that the maintenance work can be carried out conveniently.
The invention has the beneficial effects that:
the connection mode of the system in the invention ensures that the whole drainage system is in a complete vacuum state, thereby effectively and reliably maintaining the vacuum degree of the unit during operation. In addition, when the plant is arranged at a low position, the drainage system selects the connection mode to effectively prevent the drainage flash tank from flowing back to the steam turbine cylinder through the drainage pipe when the drainage flash tank is full of water, so that the steam turbine water impact accident is caused.
The invention can improve the reliability of the steam turbine drainage system of the combined cycle generator set arranged at a low position in the operation process. Through recycling the drainage, the heat economy of the unit is improved, the water inlet accident of the steam turbine can be effectively prevented in the running process, and the safe and stable running of the unit is ensured.
The invention ensures the running safety of the low-position arranged combined cycle unit in the starting and stopping processes, simultaneously avoids the waste of working media and improves the heat economy of the unit.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
The system comprises a low-pressure drain header 1, a low-pressure drain pipe 2, a drain flash tank temperature-reducing water pipeline 3, a steam exhaust pipeline 4, a low-pressure drain flash tank 5, a high-pressure drain flash tank 6, an overflow pipeline 7, a drain pump 8, a drain pipe 9, a drain pipeline 10, a condenser 11, a condenser heat well 12, a high-pressure drain pipe 13, a high-pressure drain header 14 and a drain flash tank liquid level meter 15.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, a drain system of a combined cycle unit arranged at a low position comprises a condenser 11, a drain flash tank desuperheating water pipeline 3, a drain header, a drain pipe 9, a steam exhaust pipeline 4, an overflow pipeline 7, a drain pipeline 10 and a drain flash tank liquid level meter 15;
the drain flash tank is connected with a steam exhaust pipeline 4, a drain flash tank temperature-reducing water pipeline 3, a drain collecting pipe, an overflow pipeline 7, a drain pipe 9 and a drain flash tank liquid level meter 15.
One end of the steam exhaust pipeline 4 is connected with the top end of the drainage flash tank. The drain flash tank temperature-reducing water pipeline 3 is derived from a condensate pump outlet and is connected to the upper part of the side edge of the drain flash tank. The drain pipe on each steam pipeline is connected to the drain collecting pipe of the drain flash tank, and the drain collecting pipe is connected to the middle of the side edge of the drain flash tank. The overflow conduit 7 is arranged in the middle and lower part of the side edge of the hydrophobic flash tank. One end of the drainage drain pipe 9 is connected with the bottom of the drainage flash tank. One end of a drainage flash tank liquid level meter 15 is arranged at the side edge of the drainage flash tank.
In one embodiment, the vent line 4 is divided into a high pressure hydrophobic flash tank 6 vent line 4 and a low pressure hydrophobic flash tank 5 vent line 4.
In one embodiment, an electric valve and a check valve are arranged on the exhaust pipe 4, and the outlet is connected to the throat of the condenser.
In one embodiment, the flash tank is divided into a high pressure flash tank 6 and a low pressure flash tank 5, which receive the high pressure level of flash and the low pressure level of flash during operation of the unit, respectively.
In one embodiment, the high pressure hydrophobic flash tank 6 and the low pressure hydrophobic flash tank 5 are separately arranged and connected in the same way.
In one embodiment, the hydrophobic headers are divided into a high pressure hydrophobic header 14 and a low pressure hydrophobic header 1. The pressure-staged drain pipe connections are connected to the high pressure drain header 14 and the low pressure drain header 1, respectively, by pressure-staging the drain.
In one embodiment, the high pressure and low pressure hydrophobic headers 14 and 1 are connected to a high pressure hydrophobic flash tank and a low pressure hydrophobic flash tank 5, respectively.
In one embodiment, the drain pipe 9 is divided into two branches after a main pipe is led out from the bottom of the drain flash tank, and each branch is provided with a drain pump 8, an electric valve and a check valve. The end of the pipeline is connected with a condenser hot well 12.
In one embodiment, the sewerage pipe 10 is connected to the main pipe of the hydrophobic drain pipe 9.
In one embodiment, a non-return valve is arranged on the drain flash tank overflow pipe 7, and the outlet is connected to the condenser hot well 12.
In one embodiment, the drain 10 is provided with an electrically operated valve and a manually operated valve, and the drain 10 is terminated to a condensate pump sump.
In one embodiment, the hydrophobic flash tank level gauge 15 is provided with two remote guided wave radar level gauges and one in-situ magnetic flip plate level gauge.
The working principle of the invention is as follows:
during the operation of the steam turbine, the pressure-classified drain flows into the low-pressure drain header 1 and the high-pressure drain header 14 through the low-pressure drain pipe 2 and the high-pressure drain pipe 13, respectively. After the drainage reaches the low-pressure drainage flash tank 5 and the high-pressure drainage flash tank 6, after the processes of temperature reduction, pressure reduction and flash expansion are carried out in the drainage flash tank, part of steam generated after the flash tank is expanded enters the condenser 11 through the steam exhaust pipeline 4 connected to the top of the drainage flash tank to be condensed again, and therefore the working medium is recovered.
Arrange in the hydrophobic flash tank temperature reduction water pipe 3 on hydrophobic flash tank side upper portion and spout into the hydrophobic flash tank in the temperature reduction water, make the better condensation of steam in the hydrophobic flash tank, control the temperature of the interior condensate water of hydrophobic flash tank simultaneously.
The condensed water condensed in the drain flash tank is discharged into a condenser hot well 12 at the bottom of the drain flash tank through a corresponding drain pipe 9.
The drain flash tank level meter 15 is used for monitoring the level of drain flash tank condensate water, so that the condensate water in the drain flash tank is timely discharged through the drain pump 8. The liquid level scores are three, namely two remote transmission type guided wave radar liquid level meters and an in-situ magnetic turning plate liquid level meter, so that the reliability of liquid level monitoring of the drainage flash tank is ensured.
When the liquid level of the condensed water in the drainage flash tank reaches a high I-position alarm value, a drainage pump 8 on a pipeline of a drainage pipe 9 can be automatically started, and the condensed water of the drainage flash tank is pumped into a condenser hot well 12. When the level of the condensed water in the drainage flash tank rises and reaches a high II level for alarming, the other drainage pump 8 can be automatically started in a linked mode. After the level of the condensed water in the drain flash tank is kept at a normal value, the two drain pumps 8 are stopped in sequence.
After the two drainage pumps 8 are started, the liquid level of the drainage flash tank continues to rise, the overflow pipeline 7 enables the condensed water in the drainage flash tank to overflow to the hot well 12 of the condenser, the whole system is protected, the condensed water of the drainage flash tank is effectively prevented from overflowing the drainage collecting pipe, the drainage pipeline flows into the steam turbine, and water hammer accidents of the steam turbine are caused.
When the unit is in a shutdown maintenance stage, the condensed water in the drainage flash tank can be thoroughly discharged through the drainage pipeline 10 arranged at the bottom of the drainage flash tank, so that the maintenance work can be conveniently carried out.
Because the whole drainage system is not communicated with the atmosphere during normal operation, the whole drainage system effectively ensures the vacuum degree of the steam turbine and further ensures the normal operation of the unit.
The drainage system provided by the invention enables the unit to effectively recover the working medium and heat in the operation process, avoids the thermal economic loss caused by the discharge of the working medium, improves the unit efficiency and saves energy. Meanwhile, powerful guarantee is provided for the safety of unit operation.
The meanings of the symbols in FIG. 1 are shown in Table 1.
TABLE 1 description of the symbolic meanings
Figure BDA0002766414320000081
The invention provides some ideas and methods for the operation safety of the drainage system of the combined cycle unit arranged at the low position, and the method is suitable for medium and large combined cycle units arranged at the low position, but not limited to the units. All the above description sets forth the fundamental principles of the invention, its essential features and the advantages of the invention. The present invention is not limited by the above-described embodiments, which are merely illustrative of the principles of the present invention. The present invention may be subject to various changes and modifications depending on the actual design and construction, which are within the scope of the present invention as claimed.

Claims (10)

1.一种低位布置的联合循环机组疏水系统，其特征在于，包括低压疏水管(2)和高压疏水管(13)，所述低压疏水管(2)的输出端通过低压疏水集管(1)连接低压疏水扩容器(5)，高压疏水管(13)输出端通过高压疏水集管(14)连接高压疏水扩容器(6)，所述疏水扩容器顶部设置有排汽管道(4)，排汽管道(4)用于排出疏水扩容器内部的蒸汽，排汽管道(4)的输出端连接凝汽器(11)；1. A combined cycle unit drainage system arranged at a low position, characterized in that it comprises a low-pressure drainage pipe (2) and a high-pressure drainage pipe (13), and the output end of the low-pressure drainage pipe (2) passes through a low-pressure drainage header (1). ) is connected to the low-pressure hydrophobic expansion container (5), the output end of the high-pressure hydrophobic pipe (13) is connected to the high-pressure hydrophobic expansion container (6) through the high-pressure hydrophobic header (14), and the top of the hydrophobic expansion container is provided with a steam exhaust pipe (4), The steam exhaust pipe (4) is used to discharge the steam inside the drain expansion vessel, and the output end of the exhaust steam pipe (4) is connected to the condenser (11); 所述疏水扩容器侧面设置有疏水扩容器减温水管道(3)，疏水扩容器减温水管道(3)用于向疏水扩容器内喷入减温水，所述疏水扩容器底部的凝结水输出端通过疏水排水管(9)连接凝汽器热井(12)。The side of the hydrophobic expansion container is provided with a hydrophobic expansion container desuperheating water pipeline (3), and the hydrophobic expansion container desuperheating water pipeline (3) is used to spray desuperheating water into the hydrophobic expansion container, and the condensed water output end at the bottom of the hydrophobic expansion container The condenser hot well (12) is connected through the hydrophobic drain pipe (9). 2.根据权利要求1所述的一种低位布置的联合循环机组疏水系统，其特征在于，所述疏水排水管(9)侧边中下部布置有溢流管道(7)，疏水扩容器侧边设置有疏水扩容器液位计(15)。2. A combined cycle unit hydrophobic system arranged at a low position according to claim 1, characterized in that, an overflow pipe (7) is arranged in the middle and lower part of the side of the hydrophobic drainage pipe (9), and an overflow pipe (7) is arranged on the side of the hydrophobic expansion container. A hydrophobic expansion vessel level gauge (15) is provided. 3.根据权利要求2所述的一种低位布置的联合循环机组疏水系统，其特征在于，所述疏水扩容器溢流管道(7)上设置有逆止门，出口连接至凝汽器热井(12)。3. A combined cycle unit hydrophobic system arranged at a low position according to claim 2, characterized in that, a check valve is provided on the overflow pipe (7) of the hydrophobic expansion vessel, and the outlet is connected to the condenser hot well (12). 4.根据权利要求2所述的一种低位布置的联合循环机组疏水系统，其特征在于，所述疏水扩容器液位计(15)设置有两个远传式导波雷达液位计和一个就地磁翻板液位计。4. A combined cycle unit hydrophobic system arranged at a low position according to claim 2, wherein the hydrophobic expansion vessel level gauge (15) is provided with two remote-transmission guided wave radar level gauges and one In-situ magnetic flap level gauge. 5.根据权利要求1所述的一种低位布置的联合循环机组疏水系统，其特征在于，所述排汽管道(4)上设置有一台电动阀门及一台逆止门，出口连接在凝汽器(11)的喉部。5. The combined cycle unit drainage system of a low-position arrangement according to claim 1, characterized in that, an electric valve and a check valve are arranged on the steam exhaust pipe (4), and the outlet is connected to the condensing steam Throat of the device (11). 6.根据权利要求1所述的一种低位布置的联合循环机组疏水系统，其特征在于，所述疏水扩容器分为高压疏水扩容器(6)和低压疏水扩容器(5)，分别接收机组在运行过程中的高压力等级的疏水和低压力等级的疏水，高压疏水扩容器(6)与低压疏水扩容器(5)独立分开布置，管路连接方式相同。The hydrophobic system of a combined cycle unit with a low-position arrangement according to claim 1, wherein the hydrophobic expansion vessel is divided into a high-pressure hydrophobic expansion vessel (6) and a low-pressure hydrophobic expansion vessel (5), which receive the units respectively. During the operation of the high-pressure drain and the low-pressure drain, the high-pressure drain expansion vessel (6) and the low-pressure drain expansion vessel (5) are arranged independently and separately, and the pipelines are connected in the same way. 7.根据权利要求1所述的一种低位布置的联合循环机组疏水系统，其特征在于，所述疏水集管分为高压疏水集管(14)和低压疏水集管(1)，通过将疏水进行压力分级，将压力分级后的疏水管道连接分别连接至高压疏水集管(14)和低压疏水集管(1)。7. A combined cycle unit hydrophobic system arranged at a low position according to claim 1, wherein the hydrophobic header is divided into a high pressure drain header (14) and a low pressure drain header (1). Carry out pressure grading, and connect the pressure-graded hydrophobic pipe connections to the high-pressure hydrophobic header (14) and the low-pressure hydrophobic header (1), respectively. 8.根据权利要求1所述的一种低位布置的联合循环机组疏水系统，其特征在于，所述疏水排水管(9)由疏水扩容器底部引出一根母管后，分为两个支路，每个支路上分别设置有一台疏水泵(8)、一台电动阀门以及一个逆止门，疏水排水管(9)的管道末端与凝汽器热井(12)相连。8 . The combined cycle unit hydrophobic system arranged at a low position according to claim 1 , wherein the hydrophobic drain pipe (9) is divided into two branches after a parent pipe is drawn from the bottom of the hydrophobic expansion vessel. 9 . , each branch is respectively provided with a drain pump (8), an electric valve and a check door, and the pipe end of the drain drain pipe (9) is connected with the condenser hot well (12). 9.根据权利要求1所述的一种低位布置的联合循环机组疏水系统，其特征在于，所述疏水排水管(9)的母管上连接排污管道(10)，所述排污管道(10)上设置有一台电动门及一台手动阀门，排污管道(10)末端接至凝结水泵坑。9 . A combined cycle unit drainage system arranged at a low position according to claim 1 , wherein the main pipe of the drainage and drainage pipe (9) is connected to a sewage pipe (10), and the sewage pipe (10) An electric door and a manual valve are arranged on the upper part, and the end of the sewage pipe (10) is connected to the condensate pump pit. 10.基于权利要求1所述的一种低位布置的联合循环机组疏水系统的运行方法，其特征在于，包括以下步骤；10 . The method for operating a combined cycle unit hydrophobic system with a low-position arrangement according to claim 1 , wherein the method comprises the following steps; 11 . 在蒸汽轮机运行过程中，经过压力分级后的疏水通过低压疏水管(2)和高压疏水管(13)分别流入低压疏水集管(1)和高压疏水集管(14)，疏水到达低压疏水扩容器(5)和高压疏水扩容器(6)后，在疏水扩容器中经过减温、减压及扩容过程后，部分扩容后产生的蒸汽通过连接在疏水扩容器顶部的排汽管道(4)进入凝汽器(11)中再次凝结，从而回收工质；During the operation of the steam turbine, the drained water after pressure classification flows into the low-pressure draining header (1) and the high-pressure draining header (14) through the low-pressure draining pipe (2) and the high-pressure draining pipe (13), respectively, and the drained water reaches the low-pressure draining pipe for expansion. After the device (5) and the high-pressure hydrophobic expansion vessel (6), after the temperature reduction, decompression and expansion process in the hydrophobic expansion vessel, the steam generated after part of the expansion passes through the exhaust pipe (4) connected to the top of the hydrophobic expansion vessel. Enter the condenser (11) to condense again, thereby recovering the working fluid; 所述疏水扩容器减温水管道(3)向疏水扩容器内喷入减温水，使疏水扩容器内的蒸汽更好地冷凝，同时控制疏水扩容器内凝结水的温度，在疏水扩容器中凝结的凝结水在疏水扩容器底部通过相应的疏水排水管(9)排入凝汽器热井(12)；The hydrophobic expansion container desuperheating water pipeline (3) sprays desuperheating water into the hydrophobic expansion container, so that the steam in the hydrophobic expansion container is better condensed, and at the same time, the temperature of the condensed water in the hydrophobic expansion container is controlled to condense in the hydrophobic expansion container. The condensed water is discharged into the condenser hot well (12) at the bottom of the hydrophobic expansion vessel through the corresponding hydrophobic drain pipe (9); 疏水扩容器液位计15用来监测疏水扩容器凝结水液位，从而及时通过疏水泵(8)将其内的凝结水及时排出，液位计分为三个，分别是两个远传式导波雷达液位计和一个就地磁翻板液位计；The drain expansion vessel level gauge 15 is used to monitor the condensate level of the drain expansion vessel, so as to timely discharge the condensed water in the drain expansion vessel through the drain pump (8). Guided wave radar level gauge and an in-situ magnetic flap level gauge; 当疏水扩容器内凝结水的液位达到高I位报警值时，疏水排水管(9)管路上的一台疏水泵(8)会自动启动，将疏水扩容器的凝结水打入凝汽器热井(12)，当疏水扩容器内凝结水液位还在上涨，达到高II液位报警时，另一台疏水泵(8)会自动联启，将疏水扩容器内的凝结水液位保持在正常值后，两台疏水泵(8)会依次停止；When the liquid level of the condensed water in the drainage expansion container reaches the high alarm value of 1, a drainage pump (8) on the pipeline of the drainage drainage pipe (9) will automatically start, and the condensed water in the drainage expansion container will be pumped into the condenser. In the hot well (12), when the condensate level in the drain expansion vessel is still rising and reaches the high II level alarm, the other drain pump (8) will automatically start up to increase the condensate level in the drain expansion vessel. After keeping at the normal value, the two drain pumps (8) will stop in sequence; 当两台疏水泵(8)均已启动后，疏水扩容器的液位还继续上涨，溢流管道(7)能使疏水扩容器内的凝结水溢流至凝汽器热井(12)；After the two drainage pumps (8) have been started, the liquid level of the drainage expansion container continues to rise, and the overflow pipe (7) can make the condensed water in the drainage expansion container overflow to the condenser hot well (12); 当机组在停机检修阶段时，通过布置在疏水扩容器底部的排污管道10彻底排出疏水扩容器内的凝结水，以便检修工作的进行。When the unit is in the shutdown and maintenance stage, the condensed water in the drainage expansion container is completely discharged through the sewage pipe 10 arranged at the bottom of the drainage expansion container, so as to facilitate the maintenance work.
CN202011234710.2A 2020-11-07 2020-11-07 Low-position-arranged combined cycle unit drainage system and operation method Pending CN112240230A (en)

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