CN216245628U - Vacuum pumping system with combined application of steam ejector and water ring vacuum pump - Google Patents

Abstract

The utility model discloses a vacuum-pumping system combining a steam ejector and a water-ring vacuum pump, which comprises a vacuum-pumping system body for maintaining the vacuum state of a condenser, wherein the vacuum-pumping system body comprises an ejector system, a tubular condenser and a vacuum pump system which are arranged in a matched manner, the ejector system comprises two groups of steam ejectors which are arranged in parallel, the two steam ejectors are respectively and correspondingly connected with the high pressure side and the low pressure side of the condenser, the steam outlet ends of the steam ejectors are connected with the tubular condenser through pipelines, mixed steam discharged by the steam ejectors is condensed by the tubular condenser, the tubular condenser is provided with a non-condensable gas discharge pipeline and a hydrophobic discharge pipeline, the vacuum pump system is connected with the tubular condenser through the non-condensable gas discharge pipeline so as to extract non-condensable gas in the tubular condenser and discharge the non-condensable gas out of the system, and the hydrophobic discharge pipeline is used for conveying condensed water in the tubular condenser to a hydrophobic flash tank of the condenser or carrying out the condensed water in the hydrophobic flash tank of the condenser And emptying the condensed water.

Description

Vacuum pumping system with combined application of steam ejector and water ring vacuum pump

Technical Field

The utility model relates to the technical field of design of thermal power plants, in particular to a vacuum pumping system with a steam ejector and a water ring vacuum pump jointly applied.

Background

The condenser is an important auxiliary machine of the turboset, and the vacuum state of the condenser has important influence on the safe and economic operation of the whole thermal power plant. The condenser vacuumizing system has the functions of maintaining a good vacuum state of the condenser, removing air and non-condensed gas accumulated in an air area of the condenser and ensuring high-efficiency operation of a unit. At present, water ring vacuum pumps are mostly adopted in condenser vacuum pumping equipment in thermal power units, but in the running process of the water ring vacuum pumps, the cavitation phenomenon on the surfaces of impellers is aggravated due to the rise of the environmental temperature and the cooling water temperature, the limit pumping capacity is reduced, the vacuum of the condenser is poor, and the economical efficiency of the units is reduced; and under the long-time operation cycle of the unit, the blade is easy to break, and the safe operation of the unit is threatened.

Disclosure of Invention

The utility model aims to solve the technical problem of providing a vacuum pumping system which has a flexible operation mode and effectively saves the consumption of desalted water and the service power and is applied by combining a steam ejector and a water-ring vacuum pump.

The utility model aims to solve the technical problems that the vacuum pumping system combining a steam ejector and a water ring vacuum pump comprises a vacuum pumping system body for maintaining the vacuum state of a condenser, the vacuum pumping system body comprises an ejector system, a tubular condenser and a vacuum pump system which are arranged in a matched manner, the ejector system comprises two groups of steam ejectors which are arranged in parallel, the two steam ejectors are respectively and correspondingly connected with the high-pressure side and the low-pressure side of the condenser, the steam outlet ends of the steam ejectors are connected with the tubular condenser through pipelines and condense mixed steam discharged by the steam ejectors through the tubular condenser, the tubular condenser is provided with a non-condensable gas discharge pipeline and a hydrophobic discharge pipeline, the vacuum pump system is connected with the tubular condenser through the non-condensable gas discharge pipeline to extract non-condensable gas in the tubular condenser and discharge the non-condensable gas out of the system, and the drainage discharge pipeline is used for conveying the condensed water in the tubular condenser to a drainage flash tank of the condenser or emptying the condensed water.

Furthermore, the high-pressure side and the low-pressure side of the condenser are also provided with vacuumizing bypasses connected with a vacuum pump system.

Furthermore, a power steam pipeline is arranged on the steam ejector, a pressure stabilizing tank is arranged on the power steam pipeline, and a steam inlet end of the power steam pipeline is connected with an auxiliary steam pipeline of the steam turbine.

Further, the vacuum pump system comprises three groups of water ring vacuum pumps which are arranged in parallel.

The utility model has the beneficial technical effects that: the utility model adopts the advantage of the parallel arrangement mode of two groups of steam ejectors, the steam sides of the two condenser shells can be ensured to be mutually independent, the pressure is not interfered mutually, and the power yield of the multi-backpressure condenser can be ensured; when the unit is started, the three vacuum pumps are put into operation together; in normal operation, only two steam ejectors and one vacuum pump are needed to be put into operation, and the rest two vacuum pumps are used as standby, so that the auxiliary power is saved. Meanwhile, the scheme also reduces the investment, and the steam ejector is not used and is not required to be provided with a starting steam ejector. In addition, the vacuum-pumping system of the utility model adopts condensed water as a cooling medium of the tubular condenser, and is used for recovering the condensation heat of the power steam. The operation mode can conveniently and flexibly ensure the back pressure requirement when the condenser normally operates and establish the required vacuum degree when starting, and particularly under the working condition in summer, the vacuum of the condenser can be effectively improved. Meanwhile, the common cavitation problem of an original vacuum system of a condenser of a thermal power plant can be effectively relieved, and vibration and noise are reduced; the demineralized water consumption and the service power are saved, and the equipment safety and the unit economy are improved.

Drawings

Fig. 1 is a block diagram of the vacuum pumping system body according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood by those skilled in the art, the present invention is further described with reference to the accompanying drawings and examples.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "inside", "outside", "lateral", "vertical", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description of the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, and thus, should not be construed as limiting the present invention.

As shown in fig. 1, the vacuum pumping system combining the steam ejector and the water ring vacuum pump comprises a vacuum pumping system body for maintaining the vacuum state of the condenser, the vacuum pumping system body comprises an ejector system 1, a tubular condenser 2 and a vacuum pump system 3 which are arranged in a matched manner, the ejector system 1 comprises two groups of steam ejectors 11 which are arranged in parallel, the two steam ejectors 11 are respectively and correspondingly connected with the high-pressure side and the low-pressure side of the condenser, the high-pressure side and the low-pressure side are arranged in a manner that the different vacuum degree requirements of the condenser on the high-pressure side and the low-pressure side can be effectively met, the steam sides of two condenser shells are mutually independent, the pressures of the two condenser shells are not interfered with each other, and the power yield of the multi-backpressure condenser is guaranteed. The steam outlet end of the steam ejector 11 is connected with the tubular condenser 2 through a pipeline, the mixed steam discharged by the steam ejector 11 is condensed by the tubular condenser 2, and the tubular condenser 2 is provided with a non-condensable gas discharge pipeline 21 and a hydrophobic discharge pipeline 22. The condensed water is used as a cooling medium of the tubular condenser, water is supplied from the front joint of the inlet of the shaft seal cooler, return water is accessed from the back of the outlet of the shaft seal cooler, and the condensation heat of the power steam is recovered.

The vacuum pump system 3 is connected with the tubular condenser 2 through a non-condensable gas discharge pipeline 21 so as to extract the non-condensable gas in the tubular condenser 2 and discharge the non-condensable gas out of the system, and the drain discharge pipeline 22 is used for conveying condensed water in the tubular condenser 2 to a condenser drain flash tank or draining the condensed water. The vacuum pump system 3 comprises three groups of water ring vacuum pumps 31 arranged in parallel. The conventional vacuumizing system takes quick establishment of vacuum in a unit starting stage as a model selection basis, so that the allowance is large when the model selection is designed, and the power consumption of a vacuum pump is large. The scheme optimizes three conventional sets of 50% capacity water ring vacuum pump sets into two 50% capacity steam ejectors and 3 sets of 35% capacity vacuum pump sets. When the unit is started, the three water-ring vacuum pumps are put into operation together; in normal operation, only two steam ejectors and one vacuum pump are needed to be put into operation, and the rest two vacuum pumps are used as standby, so that the auxiliary power is saved. Meanwhile, the scheme also reduces the investment, and the steam ejector is not used and is not required to be provided with a starting steam ejector. The vacuum pumping system body is relayed by the steam ejector and the water ring vacuum pump to maintain the vacuum of the unit, the air pumping performance is better, and the vacuum of the condenser can be effectively improved particularly under the working condition in summer; meanwhile, the common cavitation problem of an original vacuum system of a condenser of a thermal power plant can be effectively relieved, and vibration and noise are reduced; the demineralized water consumption and the service power are saved, and the equipment safety and the unit economy are improved.

Referring to fig. 1, the high-pressure side and the low-pressure side of the condenser are further provided with a vacuum bypass 4 connected with a vacuum pump system 3, the vacuum bypass 4 can enable the operation mode of the whole system to be more flexible, and a single operation mode of a vacuum pump system and a combined operation mode of an ejector system and the vacuum pump system can be realized. The steam ejector 11 is provided with a power steam pipeline 12, the power steam pipeline 12 is provided with a pressure stabilizing tank 13, and the steam inlet end of the power steam pipeline 12 is connected with an auxiliary steam pipeline of the steam turbine. The motive steam passes through the steam ejector nozzle in a supersonic jet flow, so that vacuum is generated, and the non-condensable gas in the condenser flows into the steam ejector.

Example (b):

taking a one-stage (2 × 1000MW) engineering ultra-supercritical double back pressure unit of a shenhua national-yongzhou power plant as an example, an original 3 × 50% water ring vacuum pump system is optimized to be configured by two 50% capacity steam ejectors and a 3 × 35% water ring vacuum pump. When the unit is started, the three vacuum pumps are put into operation together; in normal operation, only two steam ejectors and one vacuum pump are needed to be put into operation, and the other two vacuum pumps are used as standby; when any one steam ejector fails, the two steam ejectors stop operating, and the three vacuum pumps are put into operation as standby. The three operation modes can conveniently and flexibly ensure the back pressure requirement of the condenser in normal operation and establish the required vacuum degree during starting. The scheme can effectively improve the vacuum of the condenser particularly under the working condition in summer; meanwhile, the common cavitation problem of an original vacuum system of a condenser of a thermal power plant can be effectively relieved, and vibration and noise are reduced; the demineralized water consumption and the service power are saved, and the equipment safety and the unit economy are improved. Compared with a conventional 3x50% water-ring vacuum pump vacuum pumping system, the combined application scheme of the steam ejector and the water-ring vacuum pump integrates the reduced plant power consumption and the increased auxiliary steam consumption every year, and the operating cost can be saved by about 18 ten thousand yuan every year; and because the steam ejector is simple to maintain, certain daily and overhaul cost of the water ring vacuum pump can be reduced on the basis.

The utility model adopts the advantage of the parallel arrangement mode of two groups of steam ejectors, the steam sides of the two condenser shells can be ensured to be mutually independent, the pressure is not interfered mutually, and the power yield of the multi-backpressure condenser can be ensured; in addition, the vacuum-pumping system of the utility model adopts condensed water as a cooling medium of the tubular condenser, and is used for recovering the condensation heat of the power steam. The operation mode can conveniently and flexibly ensure the back pressure requirement when the condenser normally operates and establish the required vacuum degree when starting, and particularly under the working condition in summer, the vacuum of the condenser can be effectively improved. Meanwhile, the common cavitation problem of an original vacuum system of a condenser of a thermal power plant can be effectively relieved, and vibration and noise are reduced; the demineralized water consumption and the service power are saved, and the equipment safety and the unit economy are improved.

The specific embodiments described herein are merely illustrative of the principles and utilities of the present invention and are not intended to limit the utility model. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims (4)

1. The utility model provides a vacuum pumping system of steam ejector and water ring vacuum pump combined application, includes the vacuum pumping system body that is used for maintaining condenser vacuum state which characterized in that: the vacuum pumping system body is including supporting sprayer system, tubular condenser and the vacuum pump system who sets up, the sprayer system is including parallelly connected two sets of steam ejector that sets up, and two steam ejectors correspond with the high, low pressure side of condenser respectively and are connected, and steam ejector's play steam end passes through the pipeline and is connected with tubular condenser to condensate the steam jet exhaust steam by tubular condenser, last noncondensable gas exhaust pipe and the hydrophobic exhaust pipe of being provided with of tubular condenser, the vacuum pump system is connected with tubular condenser through noncondensable gas exhaust pipe and is taken out and outside the discharge system with the noncondensable gas in the tubular condenser, the hydrophobic exhaust pipe is used for carrying the comdensable water in the tubular condenser to the hydrophobic flash tank of condenser or carrying out the comdensable water evacuation.

2. The evacuation system of claim 1, wherein the steam ejector and the water-ring vacuum pump are used in combination, and the evacuation system comprises: and the high-pressure side and the low-pressure side of the condenser are also provided with vacuumizing bypasses connected with a vacuum pump system.

3. The evacuation system of claim 1 or 2, wherein the steam ejector and the water-ring vacuum pump are used in combination, and the evacuation system comprises: and the steam ejector is provided with a power steam pipeline, the power steam pipeline is provided with a pressure stabilizing tank, and the steam inlet end of the power steam pipeline is connected with an auxiliary steam pipeline of the steam turbine.

4. The evacuation system of claim 1 or 2, wherein the steam ejector and the water-ring vacuum pump are used in combination, and the evacuation system comprises: the vacuum pump system comprises three groups of water ring vacuum pumps which are arranged in parallel.

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