CN111397393A - Closed high-temperature condensed water recovery system - Google Patents

Abstract

The invention discloses a closed-type high-temperature condensed water recovery system, comprising a desuperheater and pressure reducer, a sludge drying machine, a condensed water tank, a water collecting tank, a circulating water pump and a conveying water pump; the sludge drying machine includes a main shaft heating The desuperheating and pressure reducing device is connected with the main shaft heater; the desuperheating and pressure reducing device is connected with the casing heater; the condensate water outlet of the main shaft heater is connected with the condensate water tank; the casing heater connected with the water collecting tank; the shell heater is connected with the water collecting tank through a steam communication pipe; the water collecting tank is connected with the condensed water tank; the condensed water tank is connected with the rear steam pipe of the electric switch valve; the condensed water tank is connected with The inlet of the circulating water pump is connected, the desuperheating pressure reducer is connected with the circulating water pump, the condensed water tank is connected with the outlet pipe of the circulating water pump; the condensed water tank is connected with the inlet of the conveying water pump. The steam heat source requirement of the system of the invention is simple; the equipment is simple, and the investment is low; the quality and heat of the high-temperature condensed water can be recovered 100%.

Description

Closed high temperature condensate recovery system

technical field

The invention relates to a closed-type high-temperature condensed water recovery system, which belongs to the technical field of high-temperature condensed water recovery.

Background technique

The related process equipment in the chemical industry, electronics and other industries mostly uses steam as the heat source, which produces a large amount of high-temperature, high-pressure saturated condensate water. At present, the recovery system of high-temperature and high-pressure saturated condensate water is mainly open-type recovery system, and the open-type recovery system only focuses on mass recovery, and heat recovery is very rare. With the continuous and in-depth implementation of energy-saving and emission-reduction policies, closed recycling systems have become more and more widely used due to their high quality, high heat recovery rate, and significant economic effects. At present, the closed high temperature condensate recovery system has encountered many problems in the practice process.

The closed-type high-temperature condensate recovery system uses a closed-type condensate tank, and it is necessary to carefully establish the pressure difference between different equipment nodes to prevent the closed-type tank pressure from being too high and the condensate water pressure. In order to solve the above problems, there are several solutions: 1. A flash tank is installed on the condensate drainage pipeline of the process equipment, and the flash steam is discharged to other steam heat users. This scheme is often due to the intermittent and fluctuating characteristics of other heat users. When other steam heat users do not use steam, in order to prevent the normal operation of process equipment from being affected, flash steam is discharged into the atmosphere on site. 2. An indirect heat exchange cooler is installed on the condensate drainage pipeline of the process equipment to cool the high temperature and high pressure condensate to low temperature and low pressure to ensure smooth drainage of the condensate. In this scheme, the cold source of indirect heat exchange cooling often uses circulating cooling water from the cooling tower, which requires large equipment investment and large heat loss. 3. The condensate drainage pipeline of the process equipment is connected to the pneumatic condensate recovery pump, which collects the condensate and sends it to the water tank. In this scheme, the recovery pump needs additional high-pressure steam as a driving power heat source, and after a period of operation due to the inherent characteristics of the recovery pump, the overpressure steam in the pump needs to be released to the atmospheric environment, resulting in a small amount of heat waste.

Therefore, the current closed recovery system of high temperature and high pressure saturated condensate is difficult to achieve 100% mass and heat recovery, and it is difficult to adapt to the intermittent and fluctuating characteristics of other heat users during the heat utilization process.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the deficiencies in the prior art, and to provide a closed-type high-temperature condensed water recovery system to achieve 100% recovery of heat energy and meet the needs of heat users with different characteristics, and can be extended to other similar circles In the condensate recovery system of the steam plant of the disc sludge dryer.

According to the technical solution provided by the present invention: a closed high temperature condensate recovery system, including a desuperheater, a sludge dryer, a condensate tank, a water collection tank, a circulating water pump and a conveying water pump; the sludge dryer includes The disc spindle heater and the shell steam heater layer; the desuperheater and pressure reducer are connected with the steam interface of the disc spindle heater through a connecting pipe, and an electric regulating valve is arranged on the connecting pipe; the desuperheater and pressure reducer are connected by The pipe is connected with the steam interface of the casing steam heater layer, and an electric switch valve is arranged on the connecting pipe; the condensed water outlet of the disc spindle heater is connected with the main condensed water inlet of the condensed water tank through the connecting pipe; the casing steam heating The condensed water outlet of the device layer is connected with the condensed water inlet of the water collecting tank through a connecting pipe; the steam inlet of the casing steam heater layer and the steam interface on the top of the water collecting tank are connected by a steam communication pipe; the condensed water of the water collecting tank is connected The outlet is connected to the auxiliary condensate inlet of the condensate tank through a connecting pipe; the flash steam outlet of the condensate tank is connected to the rear steam pipe of the electric switch valve through a connecting pipe to provide flash steam as the steam heat source of the casing steam heater layer; The bottom interface of the water tank is connected to the inlet of the circulating water pump, the desuperheater and pressure reducer is connected to the circulating water pump through the connecting pipe, and the upper interface of the condensing water tank is connected to the outlet pipe of the circulating water pump. Desuperheater and hot water users, the low-temperature circulating return water of hot water users flows back to the condensate tank through the connecting pipe; the bottom interface of the condensate tank is connected to the inlet of the conveying water pump, and the conveying pump sucks the high-temperature condensed water in the condensing water tank and pressurizes it Sent to the deaerator of the power plant.

Further, a first trap valve and a first check valve are arranged on the connecting pipe connecting the condensate water outlet of the disc main shaft heater with the main condensate water inlet of the condensate water tank.

Further, a second check valve and a second drain valve are arranged on the connecting pipe connecting the condensate water outlet of the water collecting tank with the auxiliary condensate water inlet of the condensate water tank.

Further, a third check valve is provided on the connecting pipe connecting the flash steam outlet of the condensate tank with the steam pipe behind the electric switch valve.

Further, the disk spindle heater uses municipal steam treated by a desuperheater and pressure reducer, and the shell steam heater layer uses municipal steam treated by a desuperheater and pressure reducer or flash steam from a condensate tank.

Further, the steam communication pipe between the casing steam heater layer and the steam space of the water collecting tank is used to maintain the same pressure, and the condensed water generated by the casing steam heater layer enters the water collecting tank by gravity flow.

Further, the flash steam discharge port of the condensate tank is connected to the steam heat user through a connecting pipe.

Further, a fourth check valve is provided on the connecting pipe connecting the condensate tank with the steam heat user.

Compared with the prior art, the present invention has the following advantages:

The pressure level of the steam heat source required by this system is only one, and there is no need for a higher pressure steam pump to drive the steam heat source; the equipment is simple and the investment is low; the quality and heat of the high-temperature condensate can be recovered 100%; The fluctuating heat user provides the heat source without affecting the process flow of the system; the system has no steaming point, which meets the requirements of the industrial operating environment of the enterprise.

Description of drawings

FIG. 1 is a schematic structural diagram of the present invention.

Figure 2 is a schematic diagram of the structure of the sludge dryer.

Description of reference numerals: 1. Desuperheater and pressure reducer; 2. Sludge dryer; 3. Electric regulating valve; 4. Electric switching valve; 5. Closed condensate tank; 6. Water collecting tank; 7. Circulating water pump ;8, heat user; 9, first steam trap; 10, second steam trap 10; 11, steam heat user; 12, delivery water pump, 13.1, first check valve, 13.2, second check valve, 13.3, The third check valve, 13.4, the fourth check valve, 101, the disc drive system motor; 102, the dryer shell; 103, the wet sludge inlet; 104, the non-condensable gas outlet, 105, the disc spindle heater ; 106, the shell steam heater layer; 107, the steam inlet of the disc spindle heater; 108, the first shell heater steam inlet; 109, the first shell heater condensate water outlet; 110, the second shell heater steam inlet; 111. Condensate water outlet of the second casing heater; 112, Steam inlet of the third casing heater; 113, Condensate water outlet of the third casing heater; 114, Dry sludge outlet; 115, Condensate water outlet of the disc spindle heater; 116. Sludge flow space; 117. Scraper.

Detailed ways

The system of the present invention will be described below with reference to the accompanying drawings and embodiments.

The closed-type high-temperature condensate recovery system of the present invention includes: a sludge dryer 2, a closed-type condensate tank 5, a water collection tank 6, a desuperheater 1, an electric regulating valve 3, an electric switch valve 4, a first drain Valve 9, second trap valve 10, circulating water pump 7, delivery water pump 12, 13.1, first check valve, 13.2, second check valve, 13.3, third check valve, 13.4, fourth check valve, heat User 8.

The sludge dryer 2 includes a disc drive system motor 101, the disc drive system motor 101 is connected to a disc spindle heater 105, and a dryer housing 102 is arranged on the disc spindle heater 105, and inside the dryer housing 102 A shell steam heater layer 106 is provided; the middle of the sludge dryer 2 is provided with a first shell heater steam inlet 108, a second shell heater steam inlet 110 and a third shell connected to the desuperheater 1 The heater steam inlet 112; the lower end of the sludge dryer 2 is provided with the first shell heater condensate outlet 109, the second shell heater condensate water outlet 111 and the third shell heater condensate connected to the water collecting tank 6 The water outlet 113; the upper end of the sludge dryer 2 is provided with a wet sludge inlet 103 and an exhaust gas outlet 104; the disc spindle heater 105 is provided with a disc spindle heater condensate outlet 115 and a disc The main shaft heater steam inlet 107, the condensed water outlet 115 of the disc main shaft heater are connected to the condensed water tank 5, and the disc main shaft heater steam inlet 107 is connected to the desuperheater 1; the bottom of the sludge dryer 2 is provided with The dry sludge outlet 114 and the sludge flow space 116; the disc spindle heater 105 is provided with a scraper 117.

Sludge dryer 2, sludge dryer 2 is a disc type sludge dryer, which uses saturated steam as a heat source to heat municipal sludge and reduce its moisture content to the design value; The sludge inlet 103 enters the sludge flow space 116 in the sludge dryer, and is discharged from the dry sludge outlet 114 after being heated and dehydrated by steam. The steam enters the main shaft heater 105 from the disc main shaft heater inlet 106, and after heating the sludge, it is cooled into condensed water and discharged from the main shaft heater condensate water outlet 115; The steam inlet 110 of the second shell heater of the disc and the steam inlet 112 of the third shell heater of the disc enter the shell heater layer 106, after heating the sludge, it is cooled to condensate and passes through the condensate water outlet 109 of the first shell heater and the second shell heater respectively. The condensed water outlet 111 of the casing heater and the condensed water outlet 113 of the third casing heater are discharged; the disc spindle heater 105 and the mud scraper 117 are driven and rotated by the disc drive system motor 101 to achieve the effect of sludge flow.

Condensate tank 5, which collects high-temperature condensate water from the sludge dryer, and then transports it to the deaerator of the power plant through a high-temperature water pump, and provides flash steam and high-temperature water to other heat users; water collection tank 6, which will high-temperature and high-pressure municipal The steam in the pipe network is decompressed to the saturated steam required by the sludge dryer 2, and the cooling water comes from the closed condensate tank 5; the electric regulating valve 3, which adjusts the amount of steam entering the main shaft of the sludge dryer; the electric switch valve 4 , which controls the switch of the steam pipe connected to the heating part of the shell of the sludge dryer 2; two traps are used to drain the condensed water of the sludge dryer and block steam, and a float ball with a back pressure higher than 90% should be selected. Circulating water pump 7, which transports high-temperature condensed water in the closed water tank to hot water users and recovers the low-temperature condensed water return water; and transport water pump 12, which transports high-temperature condensed water in the closed water tank to the deaerator of the power plant.

In the closed high-temperature condensate recovery system described above, the sludge dryer 2 has four steam inlets and condensate outlets, and a disc main shaft heating the main shaft of the dryer (total calorific value accounts for 90%). The steam inlet 107 of the dryer and the condensate outlet 115 of a disc main shaft heater are responsible for the three steam inlets of the drying machine shell heating (the total calorific value accounts for 10%): the first shell heater steam inlet 108, the second shell heating The boiler steam inlet 110, the third casing heater steam inlet 112 and three condensate outlets: the first casing heater condensate outlet 109, the second casing heater condensate outlet 111, and the third casing heater condensate outlet 113.

The closed-type high-temperature condensate water recovery system described above, its closed-type water tank has a main condensate water inlet (condensate in the main shaft of the sludge dryer), an auxiliary condensate inlet (condensate in the sludge dryer shell), flash Steam outlet, circulating water pump interface, circulating return water interface, conveying water pump interface and other auxiliary function interfaces (sewage outlet, overpressure discharge outlet, etc.).

In the above closed high temperature condensate recovery system, the water collection tank 6 has a condensed water inlet, a steam port on the top of the water collection tank 6, a condensed water outlet and other auxiliary function ports (sewage outlet, overpressure outlet, etc.).

In the closed high-temperature condensate water recovery system as described above, the circulating water pump 7 and the conveying water pump 12 should be frequency-converted water pumps with their own anti-cavitation function.

The desuperheater 1 is connected to the main shaft steam inlet of the disc main shaft heater 105 of the sludge dryer 2, and the desuperheater 1 receives (0.9MPa, 280°C) steam from the municipal heating pipe network , depressurize it to (0.7MPa, 170.4℃) saturated steam, and divide it into two paths. The first path is connected to the disc main shaft heater 105 , and the connecting pipe is provided with an electric regulating valve 3 , which can adjust the amount of steam entering the main shaft of the sludge dryer 2 . The second path is connected to the outer casing 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 steam pipe; the desuperheater 1 is connected to the circulating water pump 7, and its connecting pipe Provide desuperheating water to the desuperheater 1; the main condensate outlet of the disc main shaft heater 105 of the sludge dryer 2 is connected to the main condensate inlet of the condensate tank 5, and the connecting pipe is provided with a first check valve 13.1 And the first steam trap 9, the condensed water (0.7MPa saturated water) of the main shaft of the sludge dryer 2 is vaporized into a steam-water mixture through the first steam trap 9 in the mode of residual pressure pressure flow, and enters the condensate tank 5; the sludge dryer The shell condensate water outlet of the shell steam heater layer 106 of 2 is connected to the condensate water inlet of the water collecting tank 6, and the shell condensate water of the shell steam heater layer 106 of the sludge dryer 2 flows into the condensate water tank 5 by gravity flow; The casing steam inlet of the casing steam heater layer 106 of the mud dryer 2 is connected with the steam interface at the top of the water collecting tank 6 by a steam communication pipe, so as to ensure that the steam space in the casing steam heater layer 106 of the mud dryer 2 is connected with the steam inlet of the water collecting tank 6. The steam space of the water tank 6 is kept connected, and the internal pressures of the two are balanced, and the condensed water of the casing of the steam heater layer 106 of the sludge dryer 2 flows into the condensed water tank 5 by gravity flow; The auxiliary condensate inlet is connected, and the connecting pipe is provided with a second check valve 13.2 and a second trap valve 10; the flash steam outlet of the condensate tank 5 is connected with the steam pipe behind the electric switch valve 4, and a third check valve 13.3 is provided. When the pressure in the condensate tank 5 is greater than or equal to 0.5MPa, the electric switch valve 4 is closed. The flash steam (≥0.5MPa) of the condensate tank 5 is transported to the shell heater 2.1 of the sludge dryer 2 as a steam heat source, so that the temperature and pressure of the condensate tank 5 are always less than 0.6MPa. When the water level of the condensed water in the water collecting tank 6 reaches the upper water level, the electric switch valve 4 is opened, and the 0.7 MPa saturated steam with reduced temperature and pressure is transported into the water collecting tank 6, and the condensed water in the water collecting tank 6 is condensed in the form of a steam pump. The water is pumped into the condensate tank 5. When the condensate water level of the water collecting tank 6 reaches the lower water level line, the electric switch valve 4 performs the closing action to cut off the source of 0.7MPa saturated steam. At the same time, the residual 0.7MPa steam in the water collecting tank 6 enters the steam heater layer 106 of the sludge dryer 2 shell through the steam communication pipe, and is mixed with the flash steam from the condensate tank 5 to form the sludge dryer 2 shell steam heater layer 106 When the pressure in the condensate tank 5 is less than 0.5MPa, the electric switch valve 4 is always open, and the 0.7MPa saturated steam with desuperheating and decompression is transported into the sludge dryer 2 shell steam heater layer 106 and water collection tank 6 , after absorbing the latent heat of vaporization of 0.7MPa saturated steam, the shell heater discharges the condensed water to the water collecting tank 6 . The condensed water in the water collection tank 6 is continuously pumped into the condensed water tank 5 by 0.7MPa saturated steam in the form of a steam-driven pump. At this time, the flash steam pressure in the condensate tank 5 is cut off due to the saturated steam less than 0.7MPa, and the check valve on the flash steam outlet pipe of the condensate tank 5 prevents the 0.7MPa saturated steam from entering the condensate tank 5; the bottom interface of the condensate tank 5 is connected to the The inlet of the circulating water pump 7 is connected, and the upper interface of the condensate water tank 5 is connected with the outlet pipe of the circulating water pump 7. The circulating water pump 7 sucks the high-temperature condensed water in the condensed water tank 5 and sends it to the desuperheating and pressure reducing device 1 and the hot water user 8, and circulates back to the low temperature. The water flows back to the condensate tank 5; the bottom interface of the condensate tank 5 is connected to the inlet of the conveying water pump 12, and the conveying water pump 12 sucks the high-temperature condensed water in the condensing water tank 5 and sends it to the deaerator of the power plant under pressure. The start and stop of the conveying water pump 12 is controlled by the water level of the condensate tank 5, and proportional and integral control should be adopted to keep the water level in the condensate tank 5 within the design water level line.

The control strategy of the closed high temperature condensate recovery system as described above is: when the steam user 11 or the hot water user 8 has a heat demand, the heat of the condensate tank 5 is utilized by the heat user, and its internal pressure is lower than that of the sludge drying. Machine 2 disc spindle heater 105 and the pressure inside the shell steam heater layer 106. The electric regulating valve 3 and the electric switch valve 4 are normally open, and the disc spindle heater 105 and the casing steam heater layer 106 of the sludge dryer 2 use municipal steam; when there is no heat demand for steam users and hot water users, Sludge dryer 2 disc spindle heater 105 uses municipal steam. The electric regulating valve 3 is normally open, the electric switch valve 4 is closed, and the steam heater layer 106 of the casing of the sludge dryer 2 uses the flash steam in the condensate tank. The flash evaporation of high temperature condensed water in the condensed water tank 5 causes the pressure to drop, and its pressure is lower than the pressure in the disc spindle heater 105 of the sludge dryer 2 . When the condensed water in the steam heater layer 106 of the casing of the sludge dryer 2 collected in the water collecting tank 6 reaches the upper water level line, the electric switch valve 4 is opened, and the municipal steam enters the water collecting tank 6 and the condensed water in it reaches the upper water level. It is transported to the condensate tank 5 by means of a steam-driven pump. After the condensed water in the water collection tank 6 reaches the lower water level, the electric switch valve 4 is closed, and the residual municipal steam in the water collection tank 6 enters the shell heater 2.1 of the sludge dryer 2 and is cooled and condensed, and the outer shell of the sludge dryer 2 is cooled and condensed. The pressure in the steam heater layer 106 is restored to the flash steam pressure value, and the above process is repeated.

The present invention adopts a single pressure level steam as the heating heat source of the sludge dryer 2 and the driving power of the steam pump of the water collecting tank 6, without the need of higher pressure level steam, and the steam parameter requirements are simple.

In the present invention, the steam heater layer 106 of the outer casing of the sludge dryer 2 is the first choice for heating the condensate tank 5 flash steam as the heat source, and the heat of the high-temperature condensate is deeply utilized, which also ensures that the pressure of the condensate tank 5 is due to the flash evaporation of the high-temperature condensate. Keeping it less than 0.6Mpa ensures that there is a pressure difference of not less than 0.1MPa between the 0.7MPa saturated steam behind the desuperheater and pressure reducer 1 and the soda-water mixture in the condensate tank 5, and the condensate in the sludge dryer 2 drains smoothly.

In the present invention, other heat users consume heat to further reduce the pressure of the soda-water mixture in the condensate tank 5 . When the heat consumption is intermittent and the heat consumption fluctuates greatly, by monitoring the pressure in the condensate tank 5 and controlling the opening and closing action of the electric development valve, it is ensured that the 0.7MPa saturated steam behind the desuperheater 1 and the condensate tank 5 are separated. The pressure difference does not affect the process reliability of the sludge dryer 2.

In the present invention, the whole system is completely sealed, the flash steam outside the direct discharge is zero, and the heat and quality of the condensed water are 100% utilized. No steaming point, good corporate image.

Although the present invention has been disclosed by specific embodiments, it is not intended to limit the present invention. Any person skilled in the art can replace the equivalent components made by any person skilled in the art without departing from the spirit and scope of the present invention. Equivalent changes and modifications made in the protection scope, for example, the electric circulating water pump 7 and the electric conveying water pump 12 in the above embodiment can also be replaced by a steam-driven pump or other mechanical pump; other similar forms of process heat exchange equipment can also be used. A process heat exchange device is used to replace the sludge dryer 2 in the above embodiment to condense the steam, and these changes should still fall within the scope of this patent. Moreover, the above embodiments are only used to illustrate rather than limit the technical solutions of the present invention, but should not be understood as a combination of all the features in the specific embodiments during implementation, and the products or methods of the present invention can be described in the specification during specific applications. The technical features (including structure and method steps) of each of the technical features (including structure and method steps) are selected for use alone or in combination according to actual needs, and are hereby explained.

Claims (8)

1. A closed-type high-temperature condensate recovery system, characterized in that it comprises a desuperheater (1), a sludge dryer (2), a condensate tank (5), a water collection tank (6), and a circulating water pump (7). ) and a conveying water pump (12); the sludge dryer (2) includes a disc spindle heater (105) and a casing steam heater layer (106); the desuperheater (1) is connected through a connecting pipe It is connected with the steam interface of the disc spindle heater (105), and an electric regulating valve (3) is arranged on the connecting pipe; the desuperheater (1) is connected to the steam interface of the casing steam heater layer (106) through the connecting pipe The connection pipe is provided with an electric switch valve (4); the condensate outlet of the disc spindle heater (105) is connected to the main condensate inlet of the condensate tank (5) through the connection pipe; the casing steam heater The condensed water outlet of the layer (106) is connected to the condensed water inlet of the water collecting tank (6) through a connecting pipe; steam passes between the steam inlet of the casing steam heater layer (106) and the steam interface at the top of the water collecting tank (6). The connecting pipe is connected; the condensate outlet of the water collecting tank (6) is connected to the auxiliary condensate inlet of the condensate tank (5) through the connecting pipe; the flash steam outlet of the condensate tank (5) is connected to the electric switch valve (4) through the connecting pipe The rear steam pipe is connected to provide flash steam as the steam heat source of the shell steam heater layer (106); the bottom interface of the condensate tank (5) is connected to the inlet of the circulating water pump (7), and the desuperheater (1) passes through The connecting pipe is connected to the circulating water pump (7), the upper interface of the condensate water tank (5) is connected to the outlet pipe of the circulating water pump (7), and the circulating water pump (7) sucks the high-temperature condensed water in the condensing water tank (5) and transports it to the condensed water tank (5) through the connecting pipe. The desuperheater (1) and the hot water user (8), the low-temperature circulating return water 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 to the delivery water pump (12 ) is connected to the inlet, and the conveying water pump (12) sucks the high-temperature condensate in the condensate tank (5) and sends it to the deaerator of the power plant under pressure. 2. The closed high-temperature condensate recovery system according to claim 1, characterized in that: a connecting pipe connecting the condensate outlet of the disc spindle heater (105) with the main condensate inlet of the condensate tank (5) A first steam trap (9) and a first check valve (13.1) are set on it. 3. The closed-type high-temperature condensed water recovery system according to claim 1, characterized in that: a second connecting pipe connecting the condensed water outlet of the water collecting tank (6) and the auxiliary condensed water inlet of the condensed water tank (5) is provided. Check valve (13.2) and second trap (10). 4. The closed-type high-temperature condensate recovery system according to claim 1, characterized in that: a third stopper is provided on the connecting pipe connecting the flash steam outlet of the condensate tank (5) to the steam pipe behind the electric switch valve (4). Return valve (13.3). 5. The closed-type high-temperature condensed water recovery system according to claim 1, characterized in that: the disc spindle heater (105) uses municipal steam processed by the desuperheater and pressure reducer (1), and the outer casing The steam heater layer (106) uses municipal steam treated by the desuperheater and pressure reducer (1) or flash steam from the condensate tank (5). 6. The closed-type high-temperature condensed water recovery system according to claim 1, characterized in that: the steam space between the casing steam heater layer (106) and the water collecting tank (6) is maintained at the same pressure by a steam communication pipe, and the casing The condensed water produced by the steam heater layer (106) enters the water collection tank (6) by gravity flow. 7. The closed high temperature condensate recovery system according to claim 1, characterized in that: the flash steam discharge port of the condensate tank (5) is connected to the steam heat user (11) through a connecting pipe. 8 . The closed high temperature condensate recovery system according to claim 7 , wherein a fourth check valve ( 13.4 ) is provided on the connecting pipe connecting the condensate tank ( 5 ) with the steam heat user ( 11 ). 9 .

Images