CN111397393A - Closed high-temperature condensed water recovery system - Google Patents
Closed high-temperature condensed water recovery system Download PDFInfo
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- CN111397393A CN111397393A CN202010294205.0A CN202010294205A CN111397393A CN 111397393 A CN111397393 A CN 111397393A CN 202010294205 A CN202010294205 A CN 202010294205A CN 111397393 A CN111397393 A CN 111397393A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/08—Auxiliary systems, arrangements, or devices for collecting and removing condensate
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D11/00—Feed-water supply not provided for in other main groups
- F22D11/02—Arrangements of feed-water pumps
- F22D11/06—Arrangements of feed-water pumps for returning condensate to boiler
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G5/00—Controlling superheat temperature
- F22G5/12—Controlling superheat temperature by attemperating the superheated steam, e.g. by injected water sprays
- F22G5/123—Water injection apparatus
- F22G5/126—Water injection apparatus in combination with steam-pressure reducing valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/10—Auxiliary systems, arrangements, or devices for extracting, cooling, and removing non-condensable gases
Abstract
The invention discloses a closed high-temperature condensed water recovery system, which comprises a temperature and pressure reducing device, a sludge drying machine, a condensed water tank, a water collecting tank, a circulating water pump and a conveying water pump, wherein the temperature and pressure reducing device is connected with the sludge drying machine; the sludge drier comprises a main shaft heater and a shell heater; the temperature and pressure reducer is connected with the main shaft heater; the temperature and pressure reducing device is connected with the shell heater; a condensed water outlet of the spindle heater is connected with a condensed water tank; the shell heater is connected with the water collecting tank; the shell heater is connected with the water collecting tank through a steam communicating pipe; the water collecting tank is connected with the condensation water tank; the condensation water tank is connected with a rear steam pipe of the electric switch valve; the condensation water tank is connected with an inlet of the circulating water pump, the temperature and pressure reducing device is connected with the circulating water pump, and the condensation water tank is connected with an outlet pipe of the circulating water pump; the condensed water tank is connected with the inlet of the delivery water pump. The steam heat source of the system has simple requirement; the equipment is simple and the investment is low; the quality and heat of the high-temperature condensed water can be recovered by 100 percent.
Description
Technical Field
The invention relates to a closed high-temperature condensed water recovery system, and belongs to the technical field of high-temperature condensed water recovery.
Background
Related process equipment in chemical industry, electronic industry and the like mostly takes steam as a heat source to generate a large amount of high-temperature and high-pressure saturated condensed water. At present, the recovery system of the high-temperature high-pressure saturated condensate water is mainly an open recovery system, the open recovery system is mainly only used for quality recovery, and the heat recovery is rare. With the continuous and deep implementation of the policy of energy conservation and emission reduction, the closed recovery system is increasingly widely applied due to high quality and heat recovery rate and remarkable economic effect. The prior closed high-temperature condensed water recovery system has a plurality of problems in the practical process.
Closed high temperature condensate recovery system adopts the closed condensate tank, need carefully to establish the pressure differential between the different equipment node, prevents that the closed water tank pressure from appearing too high, and the condensate water condition of suppressing pressure appears. In order to solve the above problems, several solutions exist: 1. the condensed water drainage pipeline of the process equipment is provided with a flash tank, and flash steam is discharged to other steam heat users. The scheme is characterized in that other hot users have intermittence, volatility and the like, and when other steam hot users do not use steam, the flash steam is discharged into the atmosphere on site in order to prevent the influence on the normal operation of process equipment. 2. An indirect heat exchange cooler is arranged on a condensed water drainage pipeline of the process equipment, and the condensed water with high temperature and high pressure is cooled to low temperature and low pressure, so that the water drainage of the condensed water is ensured to be smooth. In the scheme, the cold source of indirect heat exchange cooling usually adopts circulating cooling water from a cooling tower, so that the equipment investment is large and the heat loss is large. 3. The condensed water drainage pipeline of the process equipment is connected to a pneumatic condensed water recovery pump, and condensed water is collected by the recovery pump and sent to the water tank. In the scheme, the recovery pump needs extra high-pressure steam as a driving power heat source, and after a period of running time is caused by the inherent characteristics of the recovery pump, overpressure steam in the pump needs to be released to the atmospheric environment, so that a small part of heat is wasted.
Therefore, the existing closed recovery system for the high-temperature high-pressure saturated condensed water is difficult to realize 100% quality and heat recovery, and the heat utilization process is difficult to adapt to the intermittent and fluctuating characteristics of other heat users.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a closed high-temperature condensed water recovery system to realize 100% recovery of heat energy, meet the requirements of different heat users and be popularized to other condensed water recovery systems similar to disc type sludge drying machine steam equipment.
According to the technical scheme provided by the invention: the closed high-temperature condensed water recovery system comprises a temperature and pressure reducing device, a sludge drier, a condensed water tank, a water collecting tank, a circulating water pump and a conveying water pump; the sludge drier comprises a disc spindle heater and a shell steam heater layer; the temperature and pressure reducer is connected with a steam interface of the disc spindle heater through a connecting pipe, and an electric regulating valve is arranged on the connecting pipe; the temperature and pressure reducing device is connected with a steam interface of the shell steam heater layer through a connecting pipe, and an electric switch valve is arranged on the connecting pipe; a condensed water outlet of the disc spindle heater is connected with a main condensed water inlet of the condensed water tank through a connecting pipe; a condensed water outlet of the shell steam heater layer is connected with a condensed water inlet of the water collecting tank through a connecting pipe; the steam inlet of the shell steam heater layer is connected with the steam interface at the top of the water collecting tank through a steam communicating pipe; the condensed water outlet of the water collecting tank is connected with the auxiliary condensed water inlet of the condensed water tank through a connecting pipe; the flash steam outlet of the condensation water tank is connected with a rear steam pipe of the electric switch valve through a connecting pipe so as to provide flash steam as a steam heat source of the shell steam heater layer; the interface at the bottom of the condensate tank is connected with the inlet of a circulating water pump, the temperature and pressure reducing device is connected with the circulating water pump through a connecting pipe, the interface at the upper part of the condensate tank is connected with the outlet pipe of the circulating water pump, the circulating water pump sucks high-temperature condensate water in the condensate tank and conveys the high-temperature condensate water to the temperature and pressure reducing device and a hot water user through the connecting pipe, and low-temperature circulating backwater of the hot water user flows back to the condensate tank; the interface at the bottom of the condensed water tank is connected with the inlet of a delivery water pump, and the delivery water pump pumps the high-temperature condensed water in the condensed water tank and conveys the high-temperature condensed water to a deaerator of a power plant in a pressurized manner.
Furthermore, a first drain valve and a first check valve are arranged on a connecting pipe which connects a condensed water outlet of the disc spindle heater and a main condensed water inlet of the condensed water tank.
Furthermore, a second check valve and a second drain valve are arranged on a connecting pipe connecting the condensed water outlet of the water collecting tank and the auxiliary condensed water inlet of the condensed water tank.
Furthermore, a third check valve is arranged on a connecting pipe, wherein a flash steam outlet of the condensation water tank is connected with a steam pipe behind the electric switch valve.
Further, the disc main shaft heater uses municipal steam processed by a temperature and pressure reducer, and the shell steam heater layer uses the municipal steam processed by the temperature and pressure reducer or flash steam of a condensation water tank.
Furthermore, the steam space between the shell steam heater layer and the water collecting tank adopts a steam communicating pipe to keep the pressure equal, and condensed water generated by the shell steam heater layer enters the water collecting tank in a gravity flow mode.
Further, a flash steam outlet of the condensation water tank is connected with a steam heat user through a connecting pipe.
Further, a fourth check valve is arranged on a connecting pipe of the condensation water tank and the steam heat user.
Compared with the prior art, the invention has the following advantages:
the pressure grade of the steam heat source required by the system is only one, and a steam driven pump with higher pressure is not required to drive the steam heat source; the equipment is simple and the investment is low; the quality and heat of the high-temperature condensed water can be recovered by 100 percent; the system can provide heat sources for various intermittent and fluctuating heat users without influencing the process flow of the system; the system has no steam emitting point and meets the industrial operation environment requirements of enterprises.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a schematic structural diagram of a sludge dryer.
Description of reference numerals: 1. a temperature and pressure reducer; 2. a sludge drier; 3. An electric control valve; 4. an electrically operated on-off valve; 5. a closed condensation water tank; 6. a water collection tank; 7. a water circulating pump; 8. a hot user; 9. a first trap; 10. a second trap 10; 11. steam heat user; 12. a delivery water pump, 13.1, a first check valve, 13.2, a second check valve, 13.3, a third check valve, 13.4, a fourth check valve, 101 and a disc transmission system motor; 102. the shell of the drying machine; 103. a wet sludge inlet; 104, a non-condensable gas outlet, 105 and a disc spindle heater; 106. a shell steam heater layer; 107. a disc spindle heater steam inlet; 108. a first shell heater steam inlet; 109. a first housing heater condensate outlet; 110. a second enclosure heater steam inlet; 111. a second housing heater condensate outlet; 112. a third enclosure heater steam inlet; 113. a third housing heater condensed water outlet; 114. a dry sludge outlet; 115. a condensed water outlet of the disc spindle heater; 116. a sludge flow space; 117. a mud scraper.
Detailed Description
The system of the invention is described below with reference to the figures and examples.
The closed high-temperature condensed water recovery system comprises: the system comprises a sludge drier 2, a closed condensation water tank 5, a water collecting tank 6, a temperature and pressure reducing device 1, an electric regulating valve 3, an electric switch valve 4, a first drain valve 9, a second drain valve 10, a circulating water pump 7, conveying water pumps 12 and 13.1, a first check valve, a second check valve, a 13.3, a third check valve, a 13.4, a fourth check valve and a hot user 8.
The sludge drier 2 comprises a disc transmission system motor 101, the disc transmission system motor 101 is connected with a disc spindle heater 105, a drier shell 102 is arranged on the disc spindle heater 105, and a shell steam heater layer 106 is arranged in the drier shell 102; the middle part of the sludge drier 2 is provided with a first shell heater steam inlet 108, a second shell heater steam inlet 110 and a third shell heater steam inlet 112 which are connected with the temperature and pressure reducing device 1; the lower end of the sludge drier 2 is provided with a first shell heater condensed water outlet 109, a second shell heater condensed water outlet 111 and a third shell heater condensed water outlet 113 which are connected with the water collecting tank 6; the upper end of the sludge drier 2 is provided with a wet sludge inlet 103 and a tail gas outlet 104; a disc spindle heater condensed water outlet 115 and a disc spindle heater steam inlet 107 are arranged on the disc spindle heater 105, the disc spindle heater condensed water outlet 115 is connected with the condensed water tank 5, and the disc spindle heater steam inlet 107 is connected with the temperature and pressure reducer 1; the bottom of the sludge drier 2 is provided with a dry sludge outlet 114 and a sludge flowing space 116; a mud scraper 117 is arranged on the disc spindle heater 105.
The sludge drier 2 is a disc type sludge drier, and the disc type sludge drier takes saturated steam as a heat source to heat the municipal sludge and reduce the water content of the municipal sludge to a designed value; municipal sludge enters a sludge flowing space 116 in the sludge drying machine from a wet sludge inlet 103, is heated and dehydrated by steam and then is discharged from a dry sludge outlet 114, and moisture and non-condensable gas evaporated from the sludge are discharged from a tail gas outlet 104; most of heat source steam enters the main shaft heater 105 through the disc main shaft heater inlet 106, is cooled into condensed water after heating sludge, and is discharged through the main shaft heater condensed water outlet 115; a small amount of heat source steam enters the shell heater layer 106 through a disc first shell heater steam inlet 108, a disc second shell heater steam inlet 110 and a disc third shell heater steam inlet 112 respectively, is cooled into condensed water after heating sludge, and is discharged through a first shell heater condensed water outlet 109, a second shell heater condensed water outlet 111 and a third shell heater condensed water outlet 113 respectively; the disc spindle heater 105 and the mud scraper 117 are driven by the disc transmission system motor 101 to rotate so as to achieve the sludge flowing effect.
The condensation water tank 5 is used for collecting high-temperature condensation water of the sludge drier, then conveying the high-temperature condensation water to a deaerator of a power plant through a high-temperature water pump, and providing flash steam and high-temperature water for other hot users; the water collecting tank 6 is used for reducing the temperature and the pressure of the high-temperature and high-pressure municipal pipe network steam to saturated steam required by the sludge drier 2, and cooling water comes from the closed condensation water tank 5; the electric regulating valve 3 is used for regulating the steam amount entering the main shaft of the sludge drier; the electric switch valve 4 is used for controlling a steam pipe switch connected to the heating part of the shell of the sludge drying machine 2; the two drain valves are used for draining and blocking steam for condensed water of the sludge drier, and a floating ball type drain valve with the back pressure higher than 90 percent is preferably selected; the circulating water pump 7 is used for conveying the high-temperature condensed water in the closed water tank to a hot water user and recovering the low-temperature condensed water to return water; and the conveying water pump 12 is used for conveying the high-temperature condensed water in the closed water tank to the deaerator of the power plant.
The sludge drier 2 of the closed high-temperature condensed water recovery system has four steam inlets and condensed water outlets, a disc spindle heater steam inlet 107 and a disc spindle heater condensed water outlet 115 for heating the drier spindle (the total heat value accounts for 90%), and three steam inlets for heating the drier shell (the total heat value accounts for 10%): a first shell heater steam inlet 108, a second shell heater steam inlet 110, a third shell heater steam inlet 112, and three condensed water outlets: a first case heater condensate outlet 109, a second case heater condensate outlet 111, and a third case heater condensate outlet 113.
The closed high-temperature condensed water recovery system comprises a closed water tank, a main condensed water inlet (condensed water in a main shaft of the sludge drying machine), an auxiliary condensed water inlet (condensed water in a shell of the sludge drying machine), a flash steam outlet, a circulating water pump interface, a circulating water return interface, a conveying water pump interface and other auxiliary functional interfaces (a sewage outlet, an overpressure outlet and the like).
According to the closed high-temperature condensed water recovery system, the water collecting tank 6 is provided with a condensed water inlet, a steam interface at the top of the water collecting tank 6, a condensed water outlet and other auxiliary functional interfaces (a sewage draining outlet, an overpressure discharge outlet and the like).
In the closed high-temperature condensed water recovery system, the circulating water pump 7 and the delivery water pump 12 are preferably variable frequency water pumps with anti-cavitation function.
The temperature and pressure reducing device 1 is connected with a main shaft steam inlet of a disc main shaft heater 105 of the sludge drying machine 2, and the temperature and pressure reducing device 1 receives (0.9 MPa, 280 ℃) steam from a municipal heat supply pipeline network, reduces the temperature and the pressure of the steam into (0.7 MPa, 170.4 ℃) saturated steam and is divided into two paths. The first path is connected to a disc spindle heater 105, and an electric regulating valve 3 is arranged on a connecting pipe and can regulate the amount of steam entering a spindle of the sludge drier 2. The second path is connected to the shell steam heater layer 106 and the water collecting tank 6, and an electric switch valve 4 is arranged on the connecting pipe to control the on-off of the second path of steam pipes; the temperature and pressure reducing device 1 is connected with a circulating water pump 7, and a connecting pipe of the temperature and pressure reducing device 1 supplies temperature reducing water to the temperature and pressure reducing device; a main shaft condensed water outlet of a disc main shaft heater 105 of the sludge drier 2 is connected with a main condensed water inlet of the condensed water tank 5, a first check valve 13.1 and a first drain valve 9 are arranged on a connecting pipe of the main shaft condensed water outlet, and the main shaft condensed water (0.7 MPa saturated water) of the sludge drier 2 is vaporized into a steam-water mixture through the first drain valve 9 in a residual pressure flow mode and enters the condensed water tank 5; a shell condensate outlet of the shell steam heater layer 106 of the sludge drier 2 is connected with a condensate inlet of the water collecting tank 6, and the shell condensate of the shell steam heater layer 106 of the sludge drier 2 flows into the condensate tank 5 in a gravity flow mode; the steam inlet of the shell steam heater layer 106 of the sludge dryer 2 is connected with the steam interface at the top of the water collecting tank 6 by a steam communicating pipe, so that the steam space in the shell steam heater layer 106 of the sludge dryer 2 is communicated with the steam space of the water collecting tank 6, the internal pressure of the steam space and the steam space is balanced, and the shell condensate water of the shell steam heater layer 106 of the sludge dryer 2 flows into the condensate water tank 5 in a gravity flow mode; the condensed water outlet of the water collecting tank 6 is connected with the auxiliary condensed water inlet of the condensed water tank 5, and a second check valve 13.2 and a second drain valve 10 are arranged on a connecting pipe of the condensed water tank; the flash steam outlet of the condensation water tank 5 is connected with a steam pipe behind the electric switch valve 4, and a third check valve 13.3 is arranged. When the pressure in the condensation water tank 5 is more than or equal to 0.5MPa, the electric switch valve 4 is closed. Flash steam (not less than 0.5 MPa) in the condensation water tank 5 is used as a steam heat source and is conveyed to a shell heater 2.1 of the sludge drier 2, so that the temperature and the pressure of the condensation water tank 5 are always less than 0.6 MPa. When the water level of the condensed water in the water collection tank 6 reaches the upper water level, the electric switch valve 4 is opened, 0.7MPa saturated steam with reduced temperature and pressure is conveyed into the water collection tank 6, and the condensed water in the water collection tank 6 is pumped into the condensed water tank 5 in a pneumatic pump mode. When the condensed water level of the water collection tank 6 reaches the lower water level, the electric switch valve 4 executes closing action to cut off the source of 0.7MPa saturated steam. Meanwhile, residual 0.7MPa steam in the water collecting tank 6 enters the shell steam heater layer 106 of the sludge drier 2 through a steam communicating pipe, and is mixed with flash steam from the condensation water tank 5 to form a steam heat source of the shell steam heater layer 106 of the sludge drier 2; when the pressure in the condensation water tank 5 is less than 0.5MPa, the electric switch valve 4 is opened all the time, the saturated steam with the temperature and pressure reduced by 0.7MPa is conveyed into the shell steam heater layer 106 of the sludge drier 2 and the water collection tank 6, and the shell heater discharges the condensation water to the water collection tank 6 after absorbing the latent heat of vaporization of the saturated steam with the pressure of 0.7 MPa. The condensed water in the water collecting tank 6 is continuously pumped into the condensed water tank 5 by 0.7MPa saturated steam in a pneumatic pump mode. At the moment, the pressure of flash steam in the condensation water tank 5 is cut off due to saturated steam with pressure less than 0.7MPa, and meanwhile, a check valve is arranged on a flash steam outlet pipe of the condensation water tank 5 to prevent the saturated steam with pressure of 0.7MPa from entering the condensation water tank 5; the bottom interface of the condensate tank 5 is connected with the inlet of a circulating water pump 7, the upper interface of the condensate tank 5 is connected with the outlet pipe of the circulating water pump 7, the circulating water pump 7 pumps the high-temperature condensate water in the condensate tank 5 and conveys the high-temperature condensate water to a temperature and pressure reducing device 1 and a hot water user 8, and the low-temperature circulating return water flows back to the condensate tank 5; and a port at the bottom of the condensation water tank 5 is connected with an inlet of a delivery water pump 12, and the delivery water pump 12 sucks high-temperature condensation water in the condensation water tank 5 and conveys the high-temperature condensation water to a deaerator of a power plant in a pressurized manner. The start and stop of the delivery pump 12 is controlled by the water level of the condensate tank 5, preferably by proportional integral control, to maintain the water level in the condensate tank 5 within the design water level line.
The closed high-temperature condensed water recovery system has the following control strategies: when the steam user 11 or the hot water user 8 has a heat demand, the heat of the condensation water tank 5 is utilized by the hot user, and the internal pressure of the condensation water tank is lower than the pressure in the disc spindle heater 105 and the shell steam heater layer 106 of the sludge dryer 2. The electric regulating valve 3 and the electric switch valve 4 are normally opened, and municipal steam is used for the disc spindle heater 105 and the shell steam heater layer 106 of the sludge drier 2; when neither the steam user nor the hot water user has a demand for heat, the sludge drier 2 disc spindle heater 105 uses municipal steam. The electric regulating valve 3 is normally opened, the electric switch valve 4 is closed, and the flash steam in the condensed water tank is used by the steam heater layer 106 on the shell of the sludge drier 2. The pressure is reduced due to the flash evaporation of the high-temperature condensed water in the condensed water tank 5, and the pressure is lower than the pressure in the disc spindle heater 105 of the sludge drier 2. When the condensed water in the steam heater layer 106 of the shell of the sludge drying machine 2 collected in the water collecting tank 6 reaches the upper water level, the electric switch valve 4 is opened, and the municipal steam enters the water collecting tank 6 and conveys the condensed water in the water collecting tank 6 to the condensed water tank 5 in a steam-driven pump mode. After the condensed water in the water collecting tank 6 reaches the lower water level, the electric switch valve 4 is closed, the residual municipal steam in the water collecting tank 6 enters the shell heater 2.1 of the sludge drier 2 and is cooled and condensed, the pressure in the shell steam heater layer 106 of the sludge drier 2 is restored to the flash steam pressure value, and the processes are repeated.
The invention adopts single pressure grade steam as the driving power of the steam-driven pump of the heating heat source of the sludge drier 2 and the water collecting tank 6, does not need steam with higher pressure grade, and has simple steam parameter requirement.
According to the invention, the steam heater layer 106 of the shell of the sludge drying machine 2 heats flash steam of the first-selected condensation water tank 5 as a heat source, the heat of high-temperature condensation water is deeply utilized, the pressure of the condensation water tank 5 is kept less than 0.6MPa due to the flash evaporation of the high-temperature condensation water in the condensation water tank, namely, the pressure difference of not less than 0.1MPa is ensured between the saturated steam of 0.7MPa after the temperature and pressure reducer 1 and the steam-water mixture in the condensation water tank 5, and the drainage of the condensation water of the sludge drying machine 2 is smooth.
Other heat users in the invention consume heat, and further reduce the pressure of the steam-water mixture in the condensation water tank 5. When the heat consumption of the heat user is interrupted and the heat consumption fluctuation is large, the opening and closing actions of the electric development valve are controlled by monitoring the pressure in the condensation water tank 5, so that the pressure difference between 0.7MPa of saturated steam after the temperature and pressure reducer 1 and the condensation water tank 5 is ensured, and the process reliability of the sludge drying machine 2 is not influenced.
The whole system is completely closed, the flash steam outside the direct discharge chamber is zero, and the heat and the quality of the condensed water are 100& utilization. No steam point and good enterprise image.
Although the present invention has been described with reference to specific embodiments, it is not intended to limit the present invention, and any person skilled in the art can replace the electric circulation water pump 7 and the electric transport water pump 12 in the above embodiments with a steam driven pump or other mechanical pump without departing from the spirit and scope of the present invention; other process heat exchange devices in similar forms, even two process heat exchange devices, can be used to replace the sludge drying machine 2 in the above embodiment to condense the steam, and such changes should still fall within the scope covered by the present patent. The above embodiments are only used for illustrating but not limiting the technical solutions of the present invention, and it should not be understood that the present invention must be implemented as a combination of all the features in the specific embodiments, and when the present invention is applied specifically, the product or the method of the present invention can be used by selecting one or more of the technical features (including the structure and the method steps) described in the specification according to the actual needs, and thus the present invention is described herein.
Claims (8)
1. Closed high temperature condensate recovery system, its characterized in that: comprises a temperature and pressure reducing device (1), a sludge drier (2), a condensed water tank (5), a water collecting tank (6), a circulating water pump (7) and a conveying water pump (12); the sludge drier (2) comprises a disc spindle heater (105) and a shell steam heater layer (106); the temperature and pressure reducer (1) is connected with a steam interface of the disc spindle heater (105) through a connecting pipe, and an electric regulating valve (3) is arranged on the connecting pipe; the temperature and pressure reducing device (1) is connected with a steam interface of the shell steam heater layer (106) through a connecting pipe, and an electric switch valve (4) is arranged on the connecting pipe; a condensed water outlet of the disc spindle heater (105) is connected with a main condensed water inlet of the condensed water tank (5) through a connecting pipe; a condensed water outlet of the shell steam heater layer (106) is connected with a condensed water inlet of the water collecting tank (6) through a connecting pipe; the steam inlet of the shell steam heater layer (106) is connected with the steam interface at the top of the water collecting tank (6) through a steam communicating pipe; the condensed water outlet of the water collecting tank (6) is connected with the auxiliary condensed water inlet of the condensed water tank (5) through a connecting pipe; a flash steam outlet of the condensation water tank (5) is connected with a rear steam pipe of the electric switch valve (4) through a connecting pipe so as to provide flash steam as a steam heat source of the shell steam heater layer (106); the bottom interface of the condensate tank (5) is connected with the inlet of a circulating water pump (7), the temperature and pressure reducing device (1) is connected with the circulating water pump (7) through a connecting pipe, the upper interface of the condensate tank (5) is connected with the outlet pipe of the circulating water pump (7), the circulating water pump (7) sucks high-temperature condensate water in the condensate tank (5) and conveys the high-temperature condensate water to the temperature and pressure reducing device (1) and a hot water user (8) through the connecting pipe, and low-temperature circulating backwater of the hot water user (8) flows back to the condensate tank (5) through the connecting pipe; the bottom interface of the condensate tank (5) is connected with the inlet of a conveying water pump (12), and the conveying water pump (12) sucks high-temperature condensate water in the condensate tank (5) and conveys the high-temperature condensate water to a deaerator of a power plant in a pressurized mode.
2. The closed high temperature condensate recovery system of claim 1, wherein: and a first drain valve (9) and a first check valve (13.1) are arranged on a connecting pipe connecting a condensed water outlet of the disc spindle heater (105) with a main condensed water inlet of the condensed water tank (5).
3. The closed high temperature condensate recovery system of claim 1, wherein: and a second check valve (13.2) and a second drain valve (10) are arranged on a connecting pipe which is connected with the condensed water outlet of the water collecting tank (6) and the auxiliary condensed water inlet of the condensed water tank (5).
4. The closed high temperature condensate recovery system of claim 1, wherein: and a third check valve (13.3) is arranged on a connecting pipe of a flash steam outlet of the condensation water tank (5) and a steam pipe behind the electric switch valve (4).
5. The closed high temperature condensate recovery system of claim 1, wherein: the disc main shaft heater (105) uses municipal steam treated by the temperature and pressure reducer (1), and the shell steam heater layer (106) uses the municipal steam treated by the temperature and pressure reducer (1) or flash steam of the condensation water tank (5).
6. The closed high temperature condensate recovery system of claim 1, wherein: the steam space between the shell steam heater layer (106) and the water collecting tank (6) adopts a steam communicating pipe to keep the pressure equal, and condensed water generated by the shell steam heater layer (106) enters the water collecting tank (6) in a gravity flow mode.
7. The closed high temperature condensate recovery system of claim 1, wherein: the flash steam outlet of the condensation water tank (5) is connected with a steam heat user (11) through a connecting pipe.
8. The closed high temperature condensate recovery system of claim 7, wherein: and a fourth check valve (13.4) is arranged on a connecting pipe of the condensed water tank (5) and the steam heat user (11).
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| CN202010294205.0A CN111397393A (en) | 2020-04-15 | 2020-04-15 | Closed high-temperature condensed water recovery system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113048644A (en) * | 2021-03-26 | 2021-06-29 | 安徽国祯生态科技有限公司 | Condensate water recycling device |
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2020
- 2020-04-15 CN CN202010294205.0A patent/CN111397393A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113048644A (en) * | 2021-03-26 | 2021-06-29 | 安徽国祯生态科技有限公司 | Condensate water recycling device |
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