CN212376971U

CN212376971U - Water supply pump machine seals sparge water device

Info

Publication number: CN212376971U
Application number: CN202020847245.9U
Authority: CN
Inventors: 李楠; 勾志明; 魏东旭; 李海涛; 王浩; 蔡东冬
Original assignee: Veolia Harbin Thermal Power Co Ltd
Current assignee: Veolia Harbin Thermal Power Co Ltd
Priority date: 2020-05-20
Filing date: 2020-05-20
Publication date: 2021-01-19
Anticipated expiration: 2030-05-20

Abstract

The utility model relates to a washing water sealing device of a cogeneration water feeding pump, which comprises a plate heat exchanger assembly and a connecting pipeline assembly; the hot and cold medium sides of the plate heat exchanger device assembly are respectively connected with softened water replenishing of a heat supply network and drainage of a heat supply network heater, and a drainage pipeline (7) of the heat supply network heater is connected with a valve (9) and is connected to a machine seal flushing water main pipe (10) after desalted water reaches a machine seal flushing water valve (11). The softened water replenishing pipeline (2) is connected with the softened water replenishing valve (4), and the outlet of the softened water replenishing pipeline is connected to the heat supply network water return pipeline (16) for replenishing water. The utility model discloses a retrieve the heat, reduce the demineralized water quantity, avoided exceeding standard of boiler feed dissolved oxygen, reduced manufacturing cost.

Description

Water supply pump machine seals sparge water device

The technical field is as follows:

the utility model relates to a water supply pump machine seals sparge water device.

Background art:

a boiler water feeding pump is arranged in the cogeneration, and the modern water feeding pump adopts a mechanical sealing device, so that the boiler water feeding pump has the advantages of good sealing effect, long service life, small friction coefficient, good heat impact resistance and the like, and is widely used. In the running process of the water feeding pump, because the sealing surface of the mechanical seal can generate abrasion impurities and heat during rotating friction, the impurities and the heat must be taken away in time to prevent the mechanical seal from being damaged, the flushing and the cooling of the mechanical seal are realized by utilizing a clean water source with the pressure higher than the inlet pressure of the water feeding pump; in general, power plants use demineralized water as a source of flushing cooling water. Because the demineralized water is the feed water which is not deoxidized, the demineralized water can enter the pump body of the feed pump as the water source of the machine seal washing water and is conveyed to the boiler steam pocket through the feed pump, thus increasing the dissolved oxygen of the feed water, easily causing the oxygen corrosion of the feed pipe and bringing the potential safety hazard to the operation of the equipment pipe.

The invention content is as follows:

the utility model aims at providing a water-feeding pump machine seals sparge water device is guaranteeing under the qualified prerequisite of boiler feedwater dissolved oxygen, has also practiced thrift the quantity of demineralized water simultaneously, alleviates the problem that the water supply system rises, has reduced the stove water and has added the medicine cost. The technical scheme of the utility model is that: the utility model provides a water supply pump machine seals sparge water device which characterized by: the plate type heat exchanger comprises a plate type heat exchanger assembly and a connecting pipe assembly; the cold and hot medium side of the plate heat exchanger (1) is respectively connected with a heat supply network softened water replenishing pipe (15) and a drain pipeline (6) of a heat supply network heater; the softened water supply pipeline (3) is connected with an inlet valve (5), and the inlet valve (5) is connected with a cold medium side interface of the plate type heat exchanger (1) component; the high-temperature softened water after heat exchange by the plate heat exchanger (1) is connected with an outlet valve (4) through an outlet pipeline (2), and the outlet valve (4) is connected with a heat supply network water return pipeline (16); a drain water inlet pipeline (6) of a heat supply network heater is connected with a plate heat exchanger (1) through an inlet valve (8), the drain water of the low-temperature heat supply network heater after heat exchange is connected with a machine seal flushing water supply main pipe (10) through an outlet pipeline (7) and an outlet valve (9), wherein the demineralized water main pipe (12), the demineralized water to machine seal flushing water supply valve (11) and the machine seal flushing water main pipe (10) are sequentially connected with a water supply pump (13).

The utility model discloses the theory of operation:

the utility model discloses water pump machine seals sparge water source is the heat supply network heater hydrophobic, because the heat supply network heater is hydrophobic to steam condensate, quality of water is qualified, nevertheless because the temperature is higher, so reduce the temperature through machine seal sparge water plate heat exchanger heat transfer back, be used for doing water pump machine seal sparge water. And the cold medium side of the plate heat exchanger for machine seal flushing water is supplemented with water by a heat supply network, and the supplemented water is supplemented into a circulating water system of the heat supply network after heat exchange, so that the heat is recovered, the temperature of the machine seal flushing water of the water feed pump is reduced, and the safe operation of the water feed pump is ensured.

The utility model discloses technological effect:

the utility model discloses a device machine seals sparge water is the heat supply network heater is hydrophobic, starts the initial stage at the boiler, and the feed pump need start for the boiler water feeding, and the heat supply network heater has not at this moment the condensate water yet, and accessible demineralized water comes to supply with the feed pump machine and seals sparge water this moment, and after steam boiler produced a certain amount of load, the condensate water volume of heat supply network heater satisfied the operation of heater hydrophobic pump, can switch back the hydrophobic feed pump machine of supply of heat supply network and seal the sparge water. At the present stage, each thermal power plant advocates energy conservation and emission reduction, the consumption of demineralized water is reduced, zero emission is achieved nearly through a series of technical improvements, and if the demineralized water is used, the total water volume of a system is increased, so that the water of the system rises; and the drainage of the heating net heater is used as a water source in the system, so that the water expansion of the system cannot be caused. The hydrophobic pressure of the heat supply network is higher than the pressure of the deaerator, so that the pressure of the machine seal washing water is satisfied. The cooling water side is used for supplementing softened water of the heat supply network, and the softened water is supplemented into return water of the heat supply network after being subjected to hydrophobic heat exchange with the heat supply network, so that heat is recovered, and the economy is improved.

The utility model discloses a device adopts the hydrophobic sparge water source that seals of heat supply network heater as the water-feeding pump machine, because of the hydrophobic steam turbine steam extraction condensate that is of heat supply network, quality of water is qualified, under the qualified prerequisite of boiler feedwater dissolved oxygen, has also practiced thrift the quantity of demineralized water simultaneously, alleviates the problem that the water supply system rises water, has reduced the stove water and has added the medicine cost.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

FIG. 2 is a schematic view of the connection of a demineralized water pipeline with the device.

FIG. 3 is a schematic view showing the connection between a machine seal washing water main pipe and a water supply pump.

Detailed Description

As shown in fig. 1, a water supply pump seal flushing water device comprises a plate heat exchanger assembly and a connecting pipe assembly; the cold and hot medium sides of the plate heat exchanger 1 are respectively connected with a heat supply network softened water replenishing pipe 15 and a heat supply network heater drain pipeline 6; the softened water supply pipeline 3 is connected with an inlet valve 5, and the inlet valve 5 is connected with a cold medium side interface of the plate type heat exchanger 1 assembly; the high-temperature softened water after heat exchange of the plate heat exchanger 1 is connected with an outlet valve 4 through an outlet pipeline 2, and the outlet valve 4 is connected with a heat supply network water return pipeline 16; the drain water inlet pipe 6 of the heating network heater is connected with the plate heat exchanger 1 through an inlet valve 8.

As shown in fig. 3, the drained water of the low-temperature heating network heater after heat exchange is connected with a machine seal washing water supply main pipe 10 through an outlet pipeline 7 and an outlet valve 9, wherein a desalted water main pipe 12, a desalted water to machine seal washing water supply valve 11, the machine seal washing water main pipe 10 and a water supply pump 13 are sequentially connected. The heat exchange area of the plate heat exchanger 1 is 39.2 square meters.

As shown in fig. 2, the drainage outlet pipeline 7 of the heat supply network is connected to the demineralized water pipeline 12 and the supply valve 11 from demineralized water to machine seal flushing water, so that the water source of the machine seal flushing water can be switched at any time, and the safe operation of the water supply pump under special conditions is ensured.

As shown in figure 1, the conventional thermal power plant feed pump mechanical seal flushing water device comprises a plate heat exchanger, a valve and a pipeline connected with a softened water side, and a valve and a pipeline connected with a drain side of a heat supply network.

The utility model discloses the device can realize practicing thrift the demineralized water in the conventional operation of steam power plant, and heat recovery, solution system rise water, reduce boiler feed dissolved oxygen, reduce the stove water and add the medicine to practice thrift the cost, improved the economic nature of production operation.

Claims

1. The utility model provides a water supply pump machine seals sparge water device which characterized by: the plate type heat exchanger comprises a plate type heat exchanger assembly and a connecting pipe assembly; the cold and hot medium side of the plate heat exchanger (1) is respectively connected with a heat supply network softened water replenishing pipe (15) and a drain pipeline (6) of a heat supply network heater; the softened water supply pipeline (3) is connected with an inlet valve (5), and the inlet valve (5) is connected with a cold medium side interface of the plate type heat exchanger (1) component; the high-temperature softened water after heat exchange by the plate heat exchanger (1) is connected with an outlet valve (4) through an outlet pipeline (2), and the outlet valve (4) is connected with a heat supply network water return pipeline (16); a drain water inlet pipeline (6) of a heat supply network heater is connected with a plate heat exchanger (1) through an inlet valve (8), the drain water of the low-temperature heat supply network heater after heat exchange is connected with a machine seal flushing water supply main pipe (10) through an outlet pipeline (7) and an outlet valve (9), wherein the demineralized water main pipe (12), the demineralized water to machine seal flushing water supply valve (11) and the machine seal flushing water main pipe (10) are sequentially connected with a water supply pump (13).