CN218937078U

CN218937078U - System for maintaining negative pressure operation of condenser of power plant

Info

Publication number: CN218937078U
Application number: CN202023012722.9U
Authority: CN
Inventors: 李森; 房大明; 赵强; 于冬青; 张峰
Original assignee: Jiangsu Xukuang Comprehensive Utilization Power Generation Co ltd
Current assignee: Jiangsu Xukuang Comprehensive Utilization Power Generation Co ltd
Priority date: 2020-12-15
Filing date: 2020-12-15
Publication date: 2023-04-28
Anticipated expiration: 2030-12-15

Abstract

The utility model discloses a system for maintaining the negative pressure operation of a condenser of a power plant, which comprises a Roots pump, a first cooler, a second cooler, a water ring pump and a separator which are connected in sequence, wherein a third cooler is arranged between the water ring pump and the separator; the first-stage chamber of the Roots pump is connected with a cooler, the first cooler is connected with the second-stage chamber of the Roots pump through a return pipe, and the second-stage chamber is connected with the second cooler; the cooler is connected with the cooler I through the return pipe II. The utility model has strong practicability and functionality, and can be widely applied to the technical field of power plant condensers.

Description

System for maintaining negative pressure operation of condenser of power plant

Technical Field

The utility model relates to the technical field of power plant condensers, in particular to a system for maintaining the negative pressure operation of a power plant condenser.

Background

The condenser is an important thermodynamic process device in a power generation link, absolute pressure is required to be kept within a certain range during working, and air leakage phenomenon can occur due to complexity of negative pressure equipment connected with the condenser. Therefore, the suction device is required to continuously operate to suck out the air and non-condensable gas leaked into the condenser, and the absolute pressure is kept not to rise so as to ensure that the steam can fully do work in the steam turbine. At present, the negative pressure pumping devices are basically water ring vacuum pumps, the impellers are eccentrically arranged, sealing is realized through working fluid, and gas pumping is realized through volume change during rotation. The objective disadvantages are:

(1) The pump body is large, the occupied space is large, the impeller is large, and even if the air leakage amount of the system is very small, the motor drives the impeller to consume electricity in a no-load manner, so that the electricity consumption is large;

(2) The absolute suction pressure is greatly influenced by the temperature of the working fluid, and the working fluid is easily vaporized in summer, so that the suction capacity is greatly reduced;

(3) The working solution is vaporized to cause cavitation of the impeller and the cone, so that the safety of the equipment is not high;

(4) The noise is large during working, which is not beneficial to the occupational health of staff;

(5) The working fluid is lost much, the two ends of the pump are sealed by the filler, the working fluid seeps out along the two ends of the pump shaft, and the working fluid needs to be frequently supplemented, otherwise, the output of the pump is reduced or even not output.

Therefore, a negative pressure device capable of overcoming the above-mentioned drawbacks has been proposed.

Disclosure of Invention

Aiming at the problems, the utility model provides a negative pressure maintaining system with low working noise and low energy consumption.

The technical scheme provided by the utility model is as follows:

the system for maintaining the negative pressure operation of the condenser of the power plant comprises a Roots pump, a first cooler, a second cooler, a water ring pump and a separator which are sequentially connected, wherein a third cooler is arranged between the water ring pump and the separator; the first-stage chamber of the Roots pump is connected with a cooler, the first cooler is connected with the second-stage chamber of the Roots pump through a first return pipe, and the second-stage chamber is connected with a second cooler; the cooler is connected with the cooler I through a return pipe II.

Further, the secondary chamber of the Roots pump is also connected with the inlet end of the water ring pump through a parallel pipe; and a discharge pipe is arranged between the water ring pump and the separator, and the discharge pipe is connected with the cooler III in parallel.

Further, the separator and the cooler III are respectively provided with a drain pipe I with a manual valve I; and the separator is also provided with an overflow pipe with a manual valve II.

Further, the first cooler and the second cooler are both provided with a second water drain pipe, and the second water drain pipe is provided with a third manual valve.

Further, the separator and the cooler III are respectively provided with an emptying door, and the inlet end of the Roots pump is connected with a water inlet pipe with a manual valve III and an electric valve.

Compared with the prior art, the utility model has the advantages that:

the Roots pump, the first cooler, the second cooler and the third cooler are additionally arranged, so that the purposes of reducing working noise, saving working energy consumption and reducing power consumption are achieved;

the combined device of the system is compact in arrangement, achieves the purposes of saving occupied space, being convenient for maintenance and overhaul, and is high in practicability.

Drawings

FIG. 1 is a system flow diagram of an embodiment of the present utility model.

Detailed Description

The present utility model will be described in further detail with reference to the accompanying drawings.

With reference to fig. 1, a system for maintaining the negative pressure operation of a condenser of a power plant comprises a Roots pump 1, a first cooler 2, a second cooler 3, a water ring pump 4 and a separator 5 which are sequentially connected, wherein a third cooler 6 is arranged between the water ring pump 4 and the separator 5; the first-stage chamber on the Roots pump 1 is connected with a first cooler 2, the first cooler 2 is connected with a second-stage chamber of the Roots pump 1 through a first return pipe 7, and the second-stage chamber is connected with a second cooler 3; the third cooler 6 is connected with the first cooler 2 through the second return pipe 8; a second recovery pipe 19 is connected between the separator 5 and the third cooler 6.

The Roots pump 1, the first cooler 2, the second cooler 3 and the third cooler 6 are additionally arranged, wherein working liquid is not needed in the working process of the Roots pump 1, the pumping capacity of the Roots pump is reliable and stable, the pumped air and the non-condensable gas enter the first cooler 2, and heat exchange is carried out, so that the volume of the gas is contracted and the gas is condensed; the two-stage chamber in the Roots pump 1 is fed again, and the above-mentioned working process is repeated, so that the functions of two pumps are realized by one two-stage pump.

On the basis, through adding three water-cooling plate heat exchangers, namely a cooler I2, a cooler II 3 and a cooler III 6, the purpose of cooling the extracted air and the non-condensable gas is achieved, the volume shrinkage is realized, the pumping capacity is improved, and the negative pressure operation of the condenser under specific pressure is maintained. The rear vacuum pump is a water ring pump, the sealing effect is good, the pumped condensed water is collected in the separator 5, and the recycling is realized through the recycling pipe II 19.

The secondary chamber of the Roots pump 1 is also connected with the inlet end of the water ring pump 4 through a parallel pipe 9; a discharge pipe 10 is arranged between the water ring pump 4 and the separator 5, and the discharge pipe 10 is connected with the cooler III 6 in parallel.

The parallel pipe 9 is additionally arranged, so that the purpose of directly communicating the Roots pump 1 with the water ring pump 4 under the condition of no heat exchange can be achieved, and the operation mode can be flexibly selected; by adding the exhaust pipe 10, the purpose of promoting the stable operation of the system can be achieved, and the operation stability of the system can be improved.

The separator 5 and the cooler III 6 are respectively provided with a drain pipe I12 with a manual valve I11; the separator 5 is also provided with an overflow pipe 14 with a manual valve II 13.

By adding the overflow pipe 14 and the first water discharge pipe 12, the purpose of further ensuring the stable operation of the system is achieved, and the operability is improved.

The cooler I2 and the cooler II 3 are respectively provided with a water drain pipe II 15, and the water drain pipe II 15 is provided with a manual valve III 16.

The separator 5 and the cooler 3 are respectively provided with an emptying door, and the inlet end of the Roots pump 1 is connected with a water inlet pipe 20 with a manual valve III 17 and an electric valve 18.

In the system, by providing two paths of cooling water sources, when the system is used in summer, chilled water is adopted, the cooling effect is better, and the pumped air and non-condensable gas are cooled, so that the negative pressure of the condenser is ensured, and the higher pumping capacity is achieved.

The utility model and its embodiments have been described above with no limitation, and the actual construction is not limited to the embodiments of the utility model as shown in the drawings. In summary, if one of ordinary skill in the art is informed by this disclosure, a structural manner and an embodiment similar to the technical solution should not be creatively devised without departing from the gist of the present utility model.

Claims

1. The system for maintaining the negative pressure operation of the condenser of the power plant is characterized by comprising a Roots pump, a first cooler, a second cooler, a water ring pump and a separator which are sequentially connected, wherein a third cooler is arranged between the water ring pump and the separator; the first-stage chamber of the Roots pump is connected with a cooler, the first cooler is connected with the second-stage chamber of the Roots pump through a first return pipe, and the second-stage chamber is connected with a second cooler; the cooler is connected with the cooler I through a return pipe II.

2. The system for maintaining negative pressure operation of a condenser in a power plant according to claim 1, wherein the secondary chamber of the Roots pump is further connected to the inlet end of the water ring pump by a parallel tube; and a discharge pipe is arranged between the water ring pump and the separator, and the discharge pipe is connected with the cooler III in parallel.

3. The system for maintaining negative pressure operation of a condenser in a power plant according to claim 2, wherein the separator and the cooler are provided with a drain pipe I with a manual valve I; and the separator is also provided with an overflow pipe with a manual valve II.

4. The system for maintaining negative pressure operation of a condenser in a power plant according to claim 1, wherein the first cooler and the second cooler are provided with a second drain pipe, and the second drain pipe is provided with a third manual valve.

5. A system for maintaining negative pressure operation of a condenser in a power plant according to any one of claims 1-4, wherein the separator and the cooler three are provided with emptying doors, and the inlet end of the roots pump is connected with a water inlet pipe with a manual valve three and an electric valve.