阅读说明：本技术 一种除氧冷却抗汽蚀给水系统 (Deoxidizing, cooling and cavitation-resisting water supply system ) 是由 王晓奇 周振东 路云 刘忠诚 李典来 于 2021-09-30 设计创作，主要内容包括：本发明涉及一种除氧冷却抗气蚀给水系统,具有一个除氧器,所述除氧器水箱内除氧过后的饱和水与凝水或者循环水通过不接触式换热方式使除氧器出口水温度降低,产生一定的过冷度,过冷后的给水再进入给水泵,能够大幅增加给水泵入口工质水的汽蚀余量,以防止在除氧器运行过程中造成给水泵发生汽蚀,同时由于给水与冷却用水采用非接触换热方式,能防止外界氧及杂质进入给水中,以保证给水含氧量及给水水质不会发生变化。本发明为热力系统中设置的中、高压除氧器提供了大幅便利,在热力系统中可采用换热能力更强的混合式换热形式的除氧器用于接收乏汽、高温疏水等用于加热凝水,以实现凝水的大幅温升,减少体积庞大的高低压加热器的使用。(The invention relates to a deoxidizing cooling anti-cavitation water supply system, which is provided with a deaerator, wherein saturated water and condensed water or circulating water after deoxidization in a deaerator water tank reduce the temperature of outlet water of the deaerator in a non-contact heat exchange mode to generate a certain supercooling degree, and feed water after supercooling enters a feed pump, so that the cavitation residual quantity of working medium water at the inlet of the feed pump can be greatly increased, so that the cavitation of the feed pump in the operation process of the deaerator is prevented, and meanwhile, because the feed water and cooling water adopt a non-contact heat exchange mode, external oxygen and impurities can be prevented from entering the feed water, so that the oxygen content of the feed water and the quality of the feed water can not be changed. The invention provides great convenience for the medium and high pressure deaerators arranged in the thermodynamic system, and the deaerator with a mixed heat exchange form with stronger heat exchange capability can be adopted in the thermodynamic system to receive dead steam, high-temperature drainage and the like for heating condensed water, so that the great temperature rise of the condensed water is realized, and the use of a high and low pressure heater with large volume is reduced.)

1. A kind of deaerating cools the anti-cavitation water supply system, have a deaerator, characterized by that: saturated water after the deoxidization is crossed in the oxygen-eliminating device water tank makes oxygen-eliminating device export water temperature reduce through contactless heat transfer mode with congealing water or circulating water, produces certain super-cooled degree, feedwater after the super-cooled reenters the feed pump, can increase the cavitation surplus of feed pump entry working medium water by a wide margin, in order to prevent to cause the feed pump to take place the cavitation at oxygen-eliminating device operation in-process, simultaneously because feedwater and cooling water adopt non-contact heat transfer mode, can prevent that external oxygen and impurity from getting into the feedwater, can not change with assurance feedwater oxygen content and feedwater quality of water.

2. The deoxygenated, cooled, anti-cavitation water supply system of claim 1, wherein: and the cavitation allowance of the inlet of the feed pump is accurately set by adjusting the temperature reduction value of the water at the outlet of the deaerator.

3. The deoxygenated, cooled, anti-cavitation water supply system of claim 1, wherein: the non-contact heat exchange mode adopts a cooler, and after the deoxygenated saturated water of the deoxygenator is pressurized by a water feed pump, a small part of the water is fed to the cooler through a branch pipe to be cooled to a certain temperature, and then is injected into a water outlet pipeline of the deoxygenator.

4. The deoxygenated, cooled, anti-cavitation water supply system of claim 3, wherein: the pipeline sets up a branch road that is equipped with electrical control valve at least behind the cooler, and the branch road through setting up electrical control valve is used for adjusting cooling flow when becoming the operating mode for adjust the feedwater temperature, and then adjusts the cavitation surplus in front of the feedwater pump.

5. The deoxygenated, cooled, anti-cavitation water supply system of claim 4, wherein: and a branch of a manual valve is also arranged on the rear pipeline of the cooler and used for maintaining the minimum flow so as to prevent the occurrence of cavitation of the feed water pump caused by misoperation or regulation lag of the electric regulating valve.

6. The deoxygenated, cooled, anti-cavitation water supply system of claim 1, wherein: the non-contact heat exchange mode adopts a water condensing tank, saturated water of a deaerator in the deaerator exchanges heat with condensed water in the water condensing tank, is cooled to a certain temperature, is pressurized by a water feeding pump and is supplied to a subsequent steam generator or a high-low pressure heater; and a water condensing pump is arranged behind the water condensing tank and is pressurized by the water condensing pump and then injected into the deaerator.

7. The deoxygenated, cooled, anti-cavitation water supply system of claim 1, wherein: the non-contact heat exchange mode adopts a cooler, and the saturated water of the deaerator in the deaerator is cooled to a certain temperature through heat exchange of the cooler and then is supplied to a subsequent steam generator or a high-low pressure heater after being pressurized by a water feeding pump.

8. The deoxygenated, cooled, anti-cavitation water supply system of claim 7, wherein: the cooling water in the cooler is condensed water, and the condensed water is injected into the deaerator after being subjected to heat absorption and temperature rise by the cooler.

9. The deoxygenated, cooled, anti-cavitation water supply system of claim 7, wherein: two branches are arranged behind the cooler and used for maintaining the lowest cooling water quantity requirement of the cooler in the operation process, each branch is provided with an adjusting valve, one adjusting valve is used for controlling the water quantity entering the deaerator, and the other adjusting valve is used for maintaining the minimum condensed water flow.

10. The deoxygenated, cooled, anti-cavitation water supply system of claim 7, wherein: and a bypass branch is arranged on a condensate side pipeline of the cooler and used for adjusting the flow passing through the cooler so as to control the temperature of feed water cooling.

Technical Field

The invention relates to a secondary loop system of a nuclear power station, in particular to a movable secondary loop system matched with a fourth-generation nuclear power metal reactor.

Background

The deaerator is an important device of a secondary loop system of the nuclear power station. The effect is to remove most of non-condensable gas in the condensed water by heating to saturate the condensed water so as to achieve the aim of removing oxygen. In order to ensure the safe operation of a water supply pump, a common deaerator needs to be arranged at a high position, the arrangement height of the atmospheric deaerator is 7m, the arrangement height of the medium-pressure deaerator is 11-13m, and the arrangement height of the high-pressure deaerator is 17-18 m.

The deaerator is great type equipment, and the high-order installation cost of arranging is higher and brings great degree of difficulty for maintenance etc.. The current measure for reducing the arrangement height of the deaerator is to increase the filling height in front of the feed pump by adding a jet pump between the deaerator and the inlet of the feed pump. By inquiry, the water supply system for removing oxygen, cooling and resisting cavitation erosion is not available at home and abroad at present.

Disclosure of Invention

The problems to be solved by the invention are as follows: aiming at the problems, the deaerating, cooling and cavitation-resisting water supply system is provided, and the arrangement height of a deaerator is greatly reduced under the condition that the oxygen content of water supply meets the requirement.

In order to achieve the purpose, the technical scheme of the invention is as follows: the utility model provides an anti cavitation water supply system of deoxidization cooling, has a deaerator, saturated water after the deoxidization is crossed makes deaerator export water temperature reduction through contactless heat transfer mode with congealing water or circulating water in the deaerator water tank, produces certain super-cooled, feedwater after the super-cooled reentries the water-feeding pump, can increase the cavitation surplus of water-feeding pump entry working medium water by a wide margin, cause the water-feeding pump to take place the cavitation in preventing at the deaerator operation in-process, simultaneously because feedwater and cooling water adopt non-contact heat transfer mode, can prevent that external oxygen and impurity from getting into the feedwater, can not change with the quality of water of guaranteeing the feedwater oxygen content and feedwater.

Furthermore, the cavitation allowance of the water supply pump inlet is accurately set by adjusting the temperature reduction value of the water at the deaerator outlet.

Furthermore, the non-contact heat exchange mode adopts a cooler, and after the deoxygenated saturated water of the deoxygenator is pressurized by a water feed pump, a small part of the feed water is led to the cooler through a branch pipe to be cooled to a certain temperature and then is injected into a water outlet pipeline of the deoxygenator.

Furthermore, the pipeline behind the cooler is at least provided with a branch provided with an electric regulating valve, and the branch provided with the electric regulating valve is used for regulating the cooling flow during variable working conditions, regulating the water supply temperature and further regulating the cavitation allowance in front of the water supply pump;

furthermore, a branch of a manual valve is arranged on the rear pipeline of the cooler and used for maintaining the minimum flow so as to prevent the occurrence of cavitation of the water feeding pump caused by misoperation or adjustment lag of the electric adjusting valve.

Further, the non-contact heat exchange mode adopts a water condensing tank, saturated water of a deaerator in the deaerator is cooled to a certain temperature through the water condensing tank and condensed water in the deaerator and then is supplied to a subsequent steam generator or a high-low pressure heater after being pressurized by a water supply pump, and a water condensing pump is arranged behind the water condensing tank and is injected into the deaerator after being pressurized by the water condensing pump.

Furthermore, a cooler is adopted in a non-contact type heat exchange mode, and saturated water of the deaerator in the deaerator is subjected to heat exchange and cooling by the cooler at a certain temperature and then is supplied to a subsequent steam generator or a high-low pressure heater after being pressurized by a water feeding pump.

Furthermore, the cooling water in the cooler is condensed water, and the condensed water is injected into the deaerator after being subjected to heat absorption and temperature rise by the cooler.

Furthermore, two branches are arranged behind the cooler and used for maintaining the lowest cooling water quantity requirement of the cooler in the operation process, each branch is provided with one regulating valve, one regulating valve is used for controlling the water quantity entering the deaerator, and the other regulating valve is used for maintaining the minimum condensate water flow.

Furthermore, a bypass branch is arranged on a condensate side pipeline of the cooler and used for adjusting the flow passing through the cooler so as to control the temperature of feed water cooling.

The invention has the beneficial effects that:

compared with the prior art, the invention has the following advantages:

1. the vertical arrangement height of the deaerator from the feed pump can be greatly reduced, if the feed water cooling temperature is enough, the limitation of the arrangement height can be avoided, the equipment arrangement flexibility can be greatly improved, the construction investment is reduced, and the maintenance difficulty is reduced.

2. The oxygen content of the feed water can be ensured not to be increased while the vertical arrangement height of the deaerator from the feed water pump is greatly reduced, so that the requirement of the steam generator on the oxygen content of the feed water is met.

3. The type provides great convenience for arranging the medium-pressure deaerator and the high-pressure deaerator in the thermodynamic system, and the deaerator in a hybrid heat exchange mode with stronger heat exchange capacity can be adopted in the thermodynamic system and used for receiving dead steam, draining water at high temperature and the like to heat condensed water, so that great temperature rise of the condensed water is realized, and the use of a high-pressure heater and a low-pressure heater with large volume is reduced.

Drawings

FIG. 1 is a schematic diagram of a water supply system for removing oxygen, cooling and resisting cavitation in accordance with the principles and embodiments of the present invention;

FIG. 2 is a system diagram of a second embodiment of the present invention;

FIG. 3 is a diagram of three systems according to an embodiment of the present invention;

in the figure: the system comprises a deaerator 1, a regulating valve 2, an electric regulating valve 3, a water feeding pump 4, a manual valve 5, a cooler 6, a condensate tank 7, a condensate pump 8, a regulating valve A9 and a regulating valve B10.

Detailed Description

The invention is further described with reference to the following figures and examples.

As shown in figure 1, according to the deoxygenation cooling anti-cavitation water supply system provided by the invention, saturated water after deoxygenation in a water tank of a deoxygenator 1 is subjected to non-contact heat exchange with condensed water or circulating water to reduce the temperature of water at the outlet of the deoxygenator 1 to a certain degree to generate a certain supercooling degree, and the supercooled water supply enters a water supply pump, so that the cavitation residual quantity of working medium water at the inlet of the pump can be greatly increased, and the water supply pump is prevented from cavitation caused by various reasons in the operation process of the deoxygenator. Meanwhile, the non-contact heat exchange is adopted between the feed water and the cooling water, so that external oxygen and impurities can be prevented from entering the feed water, and the oxygen content of the feed water and the quality of the feed water can be ensured not to change. The cavitation residual quantity of the inlet of the water feeding pump 4 in the deoxidizing cooling cavitation-resistant water feeding system can be accurately set by adjusting the water temperature reduction value of the outlet of the deaerator 1. The structure principle is mainly shown in figure 1.

In the figure 1, after the deoxygenated saturated water of the deoxygenator 1 is pressurized by a water feed pump 4, a small part of the feed water is led to a cooler 6 through a branch pipe to be cooled to a certain temperature, and then is injected into a water outlet pipeline of the deoxygenator 1. Preferably, two branches (only one branch can be selected according to specific conditions) are arranged on a pipeline behind the cooler 6, independent valves are respectively arranged on the two branches, one branch is preferably provided with an electric regulating valve 3, the other branch is provided with a manual valve, and one branch of the electric regulating valve 3 is used for regulating cooling flow during variable working conditions, regulating feed water temperature and further regulating cavitation allowance in front of the feed water pump 4; the branch of the manual valve is provided for maintaining a minimum flow rate to prevent the occurrence of cavitation of the feed water pump caused by the malfunction of the electric regulator valve 3 or the regulation lag.

In order to prevent cavitation of the feed pump in the starting process, the method has two operation strategies: one is that before the water in the deaerator reaches the saturation temperature, the water feed pump 4 is started to pass through a recirculation loop, the water in the deaerator 1 is in a low-flow circulation state by adjusting the valve 2, and at the moment, after the water in the deaerator 1 is saturated, the water feed pump 4 does not generate cavitation; and the other way is that a branch pipe is arranged on an outlet pipeline of the deaerator 1, and a small amount of low-temperature condensed water is injected through the branch pipe before the water feed pump 4 is started so as to reduce the water feed temperature and meet the requirement of the cavitation allowance of the starting machine of the water feed pump 4.

The embodiment mode I:

as shown in fig. 1, after the deoxygenated saturated water in the deoxygenator 1 in the type 1 is pressurized by the feed pump 4, a small part of the feed water is led to the cooler 6 through the branch pipe to be cooled to a certain temperature, and then is injected into the water outlet pipeline of the deoxygenator 1. Preferably, two branches (only one branch can be selected according to specific conditions) are arranged on a pipeline behind the cooler 6, independent valves are respectively arranged on the two branches, one branch is preferably provided with an electric regulating valve 3, the other branch is provided with a manual valve, and one branch of the electric regulating valve 3 is used for regulating cooling flow under variable working conditions and maintaining the temperature of a water supply outlet to be stable; the branch of the manual valve is provided for maintaining a minimum flow rate to prevent the occurrence of cavitation of the feed water pump caused by the malfunction of the electric regulator valve 3 or the regulation lag.

In order to prevent cavitation of the feed pump in the starting process, the method has two operation strategies: one is that before the water in the deaerator reaches the saturation temperature, the water feed pump 4 is started to pass through the recirculation loop, the water in the deaerator is in a low flow circulation state by the adjusting valve 2, and at the moment, after the water in the deaerator is saturated, the water feed pump does not generate cavitation; and the other way is to arrange a branch pipe on an outlet pipeline of the deaerator, and inject a small amount of low-temperature condensed water through the branch pipe before the water feed pump is started so as to reduce the water feed temperature and meet the requirement of cavitation allowance of the starting machine of the water feed pump.

Embodiment type two:

as shown in fig. 2, saturated water in the deaerator 1 in the deaerator of the type 2 flows through the condensed water tank 7 to exchange heat with condensed water therein, is cooled to a certain temperature, is pressurized by the water feed pump 4, and is then supplied to a subsequent steam generator or a high-low pressure heater. And a water condensing pump 8 is arranged behind the water condensing tank and is pressurized by the water condensing pump and then injected into the deaerator 1.

Embodiment type three:

as shown in fig. 3, the deaerator saturated water in the deaerator 1 in the type 3 is cooled to a certain temperature by heat exchange with the cooler 6, and then is pressurized by the water feed pump 4 and then supplied to the subsequent steam generator or the high-low pressure heater.

The cooling water in the cooler 6 is preferably condensed water, and the condensed water absorbs heat through the cooler 6 and is heated and then is injected into the deaerator 1. In order to maintain the lowest cooling water requirement of the cooler 6 in the operation process, two branches are arranged behind the cooler 6, each branch is provided with a regulating valve, one regulating valve A9 is used for controlling the water entering the deaerator 1, and the other regulating valve B10 is used for maintaining the minimum condensate flow.

This version may have a bypass branch on the condensate side of the cooler 6 for regulating the flow through the cooler 6 to control the temperature of the feed water cooling.