Power plant industrial water replenishing system

Abstract

The utility model relates to the technical field of industrial water replenishing systems, in particular to a power plant industrial water replenishing system which comprises a siphon tank and a liquid pumping device, and the liquid inlet end of the siphon tank is communicated with a unit circulating water pool forebay a and a unit circulating water pool forebay b through a pipeline a and a pipeline b respectively. A control valve a and a control valve b are respectively arranged on the pipeline a and the pipeline b; the liquid inlet end of the liquid pumping device is communicated with the liquid outlet end of the siphon tank through a pipeline c; a control valve c is arranged on the pipeline c; the liquid outlet end of the liquid pumping device is respectively communicated with the industrial water system mother pipe, the unit circulating water pool forebay a and the unit circulating water pool forebay b through a four-way valve; and control valves d are arranged on pipelines connected with three liquid outlet ends of the four-way valve. According to the industrial water replenishing system, the industrial water replenishing system is connected to the main pipe of the original industrial water system of the thermal power plant, so that the industrial water and the circulating water can be recycled during the temporary stop or maintenance period of the unit of the power plant, the discharge amount of the circulating water of the power plant and the water replenishing amount of the cooling tower are reduced, and the waste of water resources and the environmental pollution are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to industrial water replenishing system technical field, concretely relates to a power plant industrial water replenishing system. BACKGROUND

[0002] As a big water user, the unit uses water as working medium, and water flows in the system, so there are processes such as water use, drainage, wastewater recycling and reuse. Among them, the circulating water system and the industrial water system are the two main water systems in the power plant, and they are indispensable cooling systems to maintain the normal operation of the power plant. The circulating water system continuously supplies condenser cooling water and main plant auxiliary cooling water system under various operating conditions. The industrial water system, as a public system, mainly provides cooling or flushing water for ash removal air compressor room, ash storage gasification fan room, desulfurization device, fuel pump room and circulating water pump motor and other equipment. In the normal operation of the circulating water system of the power plant, there is a loss due to evaporation of the cooling tower, wind blowing and pollution, and the lost water is mainly supplied by the make-up water system and the recovered industrial water. For example Figure 1 The industrial water system usually sets three industrial water pumps, and the industrial water is transported by the water pump to the industrial water main pipe and then enters the cooling equipment respectively, and the backwater is discharged to the circulating water pump forebay for water replenishing of the circulating water system.

[0003] During the operation of the unit, when two industrial water pumps are running at the same time, all the industrial backwater is discharged to the circulating water pump forebay, and the amount of backwater exceeds the water vapor loss of the cooling tower. Especially in spring and winter, the evaporation and wind blowing loss of the cooling tower is significantly reduced, and the excess backwater causes the water level of the cooling tower pool to rise and overflow, and the drugs such as scale inhibitor and bactericide added into the circulating water flow out of the overflow port of the cooling tower, affecting the effect of adding drugs to the circulating water. During the shutdown of the power plant unit, due to the cooling water demand of some equipment in the power plant, the industrial water system cannot be shut down, and the continuous flow of industrial water backwater into the circulating water pump forebay will cause the water level of the cooling tower pool of the standby unit in the power plant to rise and overflow. In addition, during the annual maintenance work of replacing the cooling tower filler and cleaning the cooling tower, the cooling tower pool needs to be emptied and the circulating water is wasted. In the face of the scarcity of water resources and the annual water quota of the power plant, the rational use of water resources has become an urgent task for the power plant. INVENTION CONTENTS

[0004] The utility model aims at the problems in the background art, and provides a power plant industrial water replenishing system.

[0005] The technical scheme of the utility model: a power plant industrial water replenishing system, comprising

[0006] The siphon tank is connected with the circulating water pool forebay a and the circulating water pool forebay b of the unit through the pipeline a and the pipeline b respectively, control valves a and b are arranged on the pipeline a and the pipeline b respectively,

[0007] The liquid pumping device is connected with the outlet end of the siphon tank through pipeline c, and a control valve c is arranged on the pipeline c; the outlet end of the liquid pumping device is connected with the industrial water system main pipe, the front pool a of the unit circulating water pool and the front pool b of the unit circulating water pool through a four-way valve; and a control valve d is arranged on the pipeline connected with the three outlet ends of the four-way valve.

[0008] Preferably, a check valve a is arranged on the pipeline connected with the inlet end of the four-way valve and the outlet end of the liquid pumping device.

[0009] Preferably, the inlet ends of the pipeline a and the pipeline b are connected with the inlet end of the siphon tank through a three-way valve; and local oil pressure gauges are arranged on the pipeline connected with the outlet end of the three-way valve and the inlet end of the siphon tank, the pipeline c connected with the outlet end of the control valve c and the inlet end of the liquid pumping device and the pipeline connected with the outlet end of the liquid pumping device and the inlet end of the four-way valve.

[0010] Preferably, the inlet ends of the pipeline a and the pipeline b are provided with bottom valves.

[0011] Preferably, a drain valve is arranged on the liquid discharge pipeline of the siphon tank.

[0012] Preferably, the utility model also comprises a water supplement valve and a check valve b.

[0013] The check valve b is arranged on the pipeline connected with the outlet end of the control valve d and the inlet end of the industrial water system main pipe; and the water supplement valve is arranged on the pipeline connected with the inlet end of the control valve d and the outlet end of the siphon tank and the pipeline connected with the inlet end of the check valve b.

[0014] Preferably, the control valve a, the control valve b, the control valve c and the control valve d are selected from ball valves and butterfly valves.

[0015] Compared with the prior art, the above technical scheme of the utility model has the following beneficial technical effects:

[0016] In the utility model, the control valve c and the control valve a or / and the control valve b are opened, and then the liquid pumping device is started to selectively pump water from the front pool a of the unit circulating water pool or / and the front pool b of the unit circulating water pool into the siphon tank; according to the requirement, the control valve d on the pipeline connected with the industrial water system main pipe, the front pool a of the unit circulating water pool and the front pool b of the unit circulating water pool is opened to realize the technical effect that water is delivered to the industrial water system or the water in the front pool a of the unit circulating water pool or / and the front pool b of the unit circulating water pool is returned to the front pool a of the unit circulating water pool or / and the front pool b of the unit circulating water pool, and the front pool a of the unit circulating water pool and the front pool b of the unit circulating water pool are mutually water-supplemented, thereby effectively avoiding the situation that the circulating water of one unit cooling tower overflows during maintenance, and the other unit cooling tower needs to be directly water-supplemented.

[0017] By connecting a set of power plant industrial water supplement system at the original industrial water system main pipe of the power plant, the recycling of industrial water and circulating water during the temporary shutdown or maintenance of the power plant unit is realized, and the discharge amount of circulating water and the cooling tower water supplement amount of the power plant are reduced. The scheme is successfully applied to a 1000MW unit in a power plant, improves the safety and reliability of the operation of the industrial water system, and has remarkable effect in saving water, provides a feasible water-saving measure and case support for the same type of power plant, helps the power enterprise to create a water-saving enterprise, reduces water resource waste and environmental pollution, and is worth promoting. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A system block diagram for the practical application of an embodiment of the present utility model is proposed.

[0019] Figure 2 A system block diagram for an embodiment of the present utility model is proposed.

[0020] Reference signs: 1, siphon tank; 2, liquid pumping device; 3, check valve a; 4, bottom valve; 5, local oil pressure gauge; 11, water drain valve; 12, water supplement valve; 13, check valve b; 101, control valve a; 102, control valve b; 103, control valve c; 104, control valve d. DETAILED DESCRIPTION

[0021] Embodiment one

[0022] As shown in the drawings, the utility model discloses a power plant industrial water supplement system, which comprises a siphon tank 1 and a liquid pumping device 2. Figures 1-2

[0023] The liquid inlet end of the siphon tank 1 is connected to the front pool a of the unit circulating water pool and the front pool b of the unit circulating water pool through pipe a and pipe b respectively; control valve a 101 and control valve b 102 are arranged on pipe a and pipe b respectively; that is, the liquid inlet end of pipe a is arranged in the front pool a of the unit circulating water pool, control valve a 101 is arranged on pipe a, and the liquid outlet end of pipe a is connected to one liquid inlet end of the siphon tank 1; the liquid inlet end of pipe b is arranged in the front pool b of the unit circulating water pool, control valve b 102 is arranged on pipe b, and the liquid outlet end of pipe b is connected to the other liquid inlet end of the siphon tank 1; wherein control valve a 101, control valve b 102, control valve c 103 and control valve d 104 in the technical scheme are all selected from ball valves or butterfly valves, and are selected according to actual needs; if a ball valve is selected, a ball valve with a hand wheel is selected.

[0024] ​The liquid suction device 2 is connected with the liquid outlet end of the siphon tank 1 through a pipeline c, and a control valve c103 is arranged on the pipeline c; the liquid outlet end of the liquid suction device 2 is connected with an industrial water system main pipe, a front pool a of a unit circulating water pool and a front pool b of a unit circulating water pool through a four-way valve; a control valve d104 is arranged on the pipeline connected with the three liquid outlet ends of the four-way valve; a check valve a3 is arranged on the pipeline connected with the liquid outlet end of the liquid suction device 2 and the liquid inlet end of the four-way valve; the liquid outlet end of the liquid suction device 2 is connected with the liquid inlet end of the check valve a3 through a pipeline; the liquid outlet end of the check valve a3 is connected with the liquid inlet end of the four-way valve through a pipeline; the three groups of liquid outlet ends of the four-way valve are connected with the industrial water system main pipe, the front pool a of the unit circulating water pool and the front pool b of the unit circulating water pool through pipelines respectively, and control valves d104 are arranged on the above pipelines. 3

[0025] Example two

[0026] As Figures 1-2 shown, the power plant industrial water replenishment system of the utility model, compared with example one, pipeline a and pipeline b are connected with the liquid inlet end of the siphon tank 1 through a three-way valve; that is, the liquid outlet ends of pipeline a and pipeline b are connected with two liquid inlet ends of the three-way valve respectively, and one liquid outlet end of the three-way valve is connected with the liquid inlet end of the siphon tank 1. The liquid inlet ends of pipeline a and pipeline b are all provided with bottom valves 4, and the bottom valves 4 can prevent the water in the siphon tank 1 and the pump inlet pipeline from flowing back, so that the liquid suction device 2 can quickly suck water and work normally when starting.

[0027] A local oil pressure gauge 5 is arranged on the pipeline connected with the liquid outlet end of the three-way valve and the liquid inlet end of the siphon tank 1, on the pipeline c between the liquid outlet end of the control valve c103 and the liquid inlet end of the liquid suction device 2 and on the pipeline connected with the liquid outlet end of the liquid suction device 2 and the liquid inlet end of the four-way valve.

[0028] Example two

[0029] As Figure 1 shown, the power plant industrial water replenishment system of the utility model, compared with example one, the embodiment further includes a replenishment valve 12 and a check valve b13; a water drain valve 11 is arranged on the liquid discharge pipeline of the siphon tank 1.

[0030] The check valve b13 is arranged on the pipeline connected with the liquid outlet end of the control valve d104 and the liquid inlet end of the industrial water system main pipe; here, the control valve d104 refers to a valve body for controlling the industrial water to enter the industrial water system main pipe.

[0031] ​The water supplement valve 12 is installed on the pipeline connecting the liquid inlet end of the siphon tank 1 and the liquid outlet end of the control valve d104 with the liquid inlet end of the check valve b13, that is, the liquid outlet end of the water supplement valve 12 is connected with the liquid inlet end of the siphon tank 1 through a pipeline, and the liquid inlet end of the water supplement valve 12 is connected with the liquid outlet end of a three-way valve b; the liquid inlet end of the three-way valve b is connected with the liquid outlet end of the control valve d104 through a pipeline, and the other liquid outlet end of the three-way valve b is connected with the liquid inlet end of the check valve b13 through a pipeline.

[0032] As shown above, when the control valve c103 and the control valve a101 or / and the control valve b102 are opened, the liquid pumping device 2 can be started to selectively pump water from the front pool a of the unit circulating water pool or / and the front pool b of the unit circulating water pool into the siphon tank 1. According to the requirements, the control valve d104 on the pipeline connecting the liquid pumping device 2 with the industrial water system main pipeline, the front pool a of the unit circulating water pool and the front pool b of the unit circulating water pool is opened to realize the water delivery to the industrial water system or the water return from the front pool a of the unit circulating water pool or / and the front pool b of the unit circulating water pool to the front pool a of the unit circulating water pool or / and the front pool b of the unit circulating water pool, so as to realize the mutual water supplement of the front pool a of the unit circulating water pool and the front pool b of the unit circulating water pool, effectively avoid the overflow of the circulating water of one unit cooling tower during the maintenance, and the direct water supplement of the other unit cooling tower.

[0033] During the replacement of the filler of the unit cooling tower or the desilting maintenance of the unit cooling tower, the circulating water (containing the industrial water return water) of the maintenance unit cooling tower can be introduced into the front pool of the running unit cooling tower through the circulating water interconnection pipeline of the industrial water supplement system as the water supplement of the running unit cooling tower, so as to reduce the water supplement amount of the water outlet pipeline of the flocculation and sedimentation pool of the water purification station of the power plant, and reduce the use amount of the raw water. The replacement of the filler of the unit cooling tower or the desilting maintenance of the unit cooling tower is basically carried out once a year, and the cycle is about 20 days. According to the rated flow of the industrial water special pump of 630 m 3 / h, the water saving amount is about 302,400 tons per year.

[0034] During the shutdown of two units of the power plant, three industrial water pumps can be stopped, and the liquid pumping device 2 is started to realize the recycling of the industrial water system and reduce the industrial water overflow. According to the rated flow of the industrial water pump of 500 m 3 / h, the water saving amount is about 720,000 tons per year.

[0035] When the water intake outside the power plant is interrupted or all the three industrial water pumps are out of order, the industrial water system can be used as an emergency pump to ensure the normal operation of the industrial water system equipment users, avoid the high temperature protection action of the equipment due to the lack of industrial cooling water, and cause the non-planned shutdown of the unit. If the non-planned shutdown accident of the unit of the power plant due to the industrial water system is avoided, the direct economic loss of at least 200,000 yuan can be avoided.

[0036] The embodiments of the present application are described in detail above with reference to the drawings, but the present application is not limited to this, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application.

Claims

1. A power plant industrial water makeup system, characterized by, The invention relates to a circulating water system for a steam turbine unit, which comprises a siphon tank (1) with its liquid inlet end connected to the front pool a and the front pool b of the circulating water pool of the steam turbine unit through pipes a and b respectively, and control valves a (101) and b (102) arranged on the pipes a and b respectively; a liquid pumping device (2) with its liquid inlet end connected to the liquid outlet end of the siphon tank (1) through a pipe c, and a control valve c (103) arranged on the pipe c; the liquid outlet end of the liquid pumping device (2) is connected to the industrial water system main pipe, the front pool a and the front pool b of the circulating water pool of the steam turbine unit through a four-way valve, and control valves d (104) are arranged on the pipes connected to the three liquid outlet ends of the four-way valve.

2. A power plant industrial water make-up system according to claim 1, wherein, A check valve a is arranged on the pipe connecting the liquid inlet end of the four-way valve and the liquid outlet end of the liquid pumping device (2).

3. A power plant industrial water make-up system as claimed in claim 2, wherein, The liquid inlet ends of the pipes a and b are connected to the liquid inlet end of the siphon tank (1) through a three-way valve; local oil pressure gauges (5) are arranged on the pipes connecting the liquid outlet end of the three-way valve and the liquid inlet end of the siphon tank (1), the pipe c connecting the liquid outlet end of the control valve c (103) and the liquid inlet end of the liquid pumping device (2), and the pipe connecting the liquid outlet end of the liquid pumping device (2) and the liquid inlet end of the four-way valve.

4. The industrial water make-up system for a power plant of claim 1, wherein, The liquid inlet ends of the pipes a and b are provided with bottom valves (4).

5. A power plant industrial water make-up system according to claim 1, wherein, A drain valve (11) is arranged on the liquid outlet pipe of the siphon tank (1).

6. A power plant industrial water make-up system as claimed in claim 1, wherein, The invention further comprises a water supply valve (12) and a check valve b (13); The check valve b (13) is arranged on the pipe connecting the liquid outlet end of the control valve d (104) and the liquid inlet end of the industrial water system main pipe; the water supply valve (12) is arranged on the pipe connecting the liquid inlet end of the siphon tank (1) and the pipe connecting the liquid outlet end of the control valve d (104) and the liquid inlet end of the check valve b (13).

7. A power plant industrial water make-up system as claimed in claim 1, wherein, The control valves a (101), b (102), c (103) and d (104) are selected from ball valves and butterfly valves.

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