Condensed water flash evaporation energy recovery device and system

Abstract

The invention discloses a condensed water flash evaporation energy recovery device and a system thereof. The device comprises an upper end cover, a lower end cover, an outer barrel and a rotor, the upper end cover and the lower end cover are connected with the two ends of the outer barrel respectively and jointly define an inner cavity. A condensed water inlet and a condensed water flash evaporation outlet which are communicated with the inner cavity are formed in the upper end cover and are respectively positioned on two opposite sides of the center of the upper end cover; the lower end cover is provided with a pressurizing flash evaporation return water outlet and a flash evaporation return water inlet which are communicated with the inner cavity; the pressurizing flash evaporation return water outlet and the flash evaporation return water inlet are respectively positioned on two opposite sides of the center of the lower end cover; the rotor can be rotatably arranged in the inner cavity around the central axis of the rotor, the rotor is provided with an even number of spiral hole channels penetrating in the axial direction of the rotor, and the even number of spiral hole channels are evenly distributed in the circumferential direction of the rotor. The device has flash evaporation and pressurized flash evaporation water return functions and is high in flash evaporation rate, high in condensed water pressure energy recovery efficiency and long in service life.

Description

Technical Field

[0001] The invention relates to a condensate flash evaporation energy recovery technology in the fields of petrochemical industry, steel and the like. Background Art

[0002] Steam heating is widely used in industrial production. Steam is indirectly heated and condensed into saturated water (condensate), which is discharged through the steam trap. The heat of condensate can reach 20% to 30% of the total heat of steam. The higher the pressure and temperature, the more heat the condensate has, and the greater the proportion of the total heat of steam. Before the 1980s, most manufacturers discharged condensate into the ditch, which wasted water resources, energy, and polluted the environment. Therefore, recycling high-temperature condensate is an important way to solve steam energy saving.

[0003] Condensate recovery systems can be classified in many ways according to the steam process used, site conditions, condensate state parameters, recovery purposes, etc. According to whether the system is connected to the atmosphere, it can be divided into open and closed condensate recovery systems; according to the transportation method of the recovered condensate, it can be divided into gravity condensate recovery system, residual pressure condensate recovery system, pressurized condensate recovery system, pumpless automatic pressure condensate recovery system, etc.; according to the condensate recycling method, it can be divided into direct utilization, indirect utilization, and flash evaporation utilization.

[0004] Flash evaporation recovery of condensed water is an important method for efficient and stable recovery of condensed water. Flash evaporation recovery of condensed water can fully recover the sensible heat of condensed water and the latent heat contained in secondary steam. Unlike the vaporization of saturated water in the boiler absorbing the heat of fuel, flash evaporation of condensed water is the re-evaporation of steam after releasing heat to form a liquid state. The heat comes from the condensed water itself. Therefore, the flash evaporation recovery of condensed water greatly improves the heat utilization rate of condensed water.

[0005] Figure 1 The figure shows the condensate flash evaporation recovery and utilization flow chart in the prior art. Due to the existence of flash evaporation characteristics, the flash evaporation process is mainly determined by the system pressure difference. Figure 1 As shown, most of the condensate in the condensate flash recovery system is flashed by the pressure drop of the regulating valve 1 and the flash tank 2 to form flash steam, which is saturated steam, and the remaining condensate after flashing is still saturated water. Steam and water can still be converted into each other when the pressure and temperature change. In order to improve the flash rate and make full use of the latent heat of condensate, there are two main existing technical routes: one is to use a steam-steam jet heat pump 3, using high-pressure steam as the working fluid to inject low-pressure flash steam as the sucked fluid, and timely extract the flash steam to control the pressure of the flash tank 2, while improving the quality of the flash steam; the second is to use a steam compressor 4 to control the pressure of the flash tank 2 and improve the steam quality. Figure 1 Also shown are steam-using equipment 7 and a steam network 8.

[0006] The return pump 5 is an important auxiliary equipment in the condensate flash recovery system of the prior art. Its function is to send the flashed condensate to the rear condensate network (heat exchange network) 9 for further heat exchange, or to the rear deaerator, and then to the boiler by the feed water pump. The condensate pump is a necessary link to complete the steam-water cycle. In theory, the greater the pressure drop of the regulating valve 1 and the flash tank 2 of the condensate flash recovery system, the more conducive to flash evaporation. Therefore, when the inlet pressure remains unchanged, the smaller the pressure of the flash tank 2, the greater the flash rate. However, considering the energy saving of the return pump 5 after flash evaporation and the hydraulic balance of the entire return network, the recovery system needs to have controlled flash condensate. In order to understand the whole process, it is assumed that the pressure = 0 (gauge pressure), the maximum flash rate is about 22% (obtained by consulting the trend chart of flash rate with different working pressures in the literature), and 78% of the return water after flash needs to be pumped into the back-end pipeline from the gauge pressure 0 through the return pump 5. The power of the return pump 5 is the most critical energy-saving point of the entire condensate flash recovery system, and needs to be comprehensively determined according to the system parameters. The medium of the return pump 5 is saturated water after flash, so the return pump 5 is very easy to cause cavitation. Although many optimizations have been made for return water transportation, such as: using a gas delivery pump to pump out the return water; installing a water-water ejector in front of the centrifugal pump to increase the inlet pressure of the centrifugal pump to prevent water pump cavitation; increasing the installation height of the flash tank and increasing the water pressure head before the pump, these measures still have certain risks for the long-term operation of the flash recovery system. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide a condensate flash evaporation energy recovery device and its system which have both flash evaporation and pressurized flash evaporation water return functions and have high flash evaporation rate, high condensate pressure energy recovery efficiency, long service life and strong adaptability to working conditions.

[0008] According to one aspect of an embodiment of the present invention, a condensate flash evaporation energy recovery device is provided, comprising an upper end cover, a lower end cover, an outer cylinder and a rotor; the upper end cover and the lower end cover are respectively connected to the two ends of the outer cylinder, and the upper end cover, the lower end cover and the outer cylinder jointly define an inner cavity; the upper end cover is provided with a condensate inlet and a condensate flash evaporation outlet connected to the inner cavity, and the condensate inlet and the condensate flash evaporation outlet are respectively located on two opposite sides of the center of the upper end cover; the lower end cover is provided with a pressurized flash evaporation return water outlet and a flash evaporation return water inlet connected to the inner cavity, and the pressurized flash evaporation return water outlet and the flash evaporation return water inlet are respectively located on two opposite sides of the center of the lower end cover, and the pressurized flash evaporation return water outlet is on the same side as the condensate inlet, and the flash evaporation return water inlet and the condensate flash evaporation outlet are on the same side; the rotor is rotatably arranged in the inner cavity around its own central axis, and the rotor is provided with an even number of spiral channels penetrating along the axial direction of the rotor, and the even number of spiral channels are evenly distributed along the circumferential direction of the rotor.

[0009] According to another aspect of an embodiment of the present invention, a condensate flash energy recovery system is provided, comprising a flash tank and the aforementioned condensate flash energy recovery device; the inlet of the flash tank is connected to the condensate flash outlet of the condensate flash energy recovery device, the liquid phase outlet of the flash tank is connected to the flash return water inlet of the condensate flash energy recovery device, and the gas phase outlet of the flash tank is used to discharge flash steam; the condensate inlet of the condensate flash energy recovery device is used to receive high-pressure condensate input from the outside, the flash return water inlet of the condensate flash energy recovery device is used to receive low-pressure flash return water from the flash tank, and the rotor of the condensate flash energy recovery device is used to rotate under the drive of the high-pressure condensate, so that the pressure energy of the high-pressure condensate in half of the spiral channel can be transferred to the low-pressure flash return water, and the pressurized flash return water is discharged through the pressurized flash return water outlet, and the reduced-pressure condensate in the remaining half of the spiral channel is flash evaporated, and the flashed condensate enters the flash tank through the condensate flash outlet.

[0010] The present invention has at least the following advantages and features:

[0011] 1. The condensate flash energy recovery device according to the embodiment of the present invention can flash condensate and pressurize the low-pressure flash return water from the flash tank, and has a high flash rate;

[0012] 2. The rotor of the condensate flash energy recovery device of the embodiment of the present invention adopts a spiral channel structure, which can effectively alleviate the problems of vibration and wear caused by cavitation, and has strong stability, long service life and low maintenance cost;

[0013] 3. The condensate flash evaporation energy recovery system of the embodiment of the present invention does not need to use the pressure reducing regulating valve and return water pump in the flash evaporation process of the prior art, and the system structure is compact and highly integrated. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The present invention shows a flow chart of condensate flash evaporation recovery and utilization in the prior art.

[0015] Figure 2 A flow chart of a condensate flash evaporation energy recovery system according to an embodiment of the present invention is shown.

[0016] Figure 3 An exploded schematic diagram showing the main structure of a condensate flash evaporation energy recovery device according to an embodiment of the present invention.

[0017] Figure 4 A schematic diagram showing the working principle of a condensate flash evaporation energy recovery device according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0018] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] The present application discloses an energy recovery system that can improve the condensate flash recovery rate and flash return water pressure. The system has the functions of flash evaporation and pressurized flash return water. The pressure reducing regulating valve 1 and the return water pump 5 in the flash evaporation process of the prior art can be replaced and integrated into a condensate flash energy recovery system. The system has a compact structure and a higher degree of integration. The rotor of the condensate flash energy recovery device in the system adopts a spiral channel structure, which can effectively alleviate the problems of vibration and wear caused by cavitation, and has strong stability, long service life and low maintenance cost.

[0020] Figure 3 FIG. 1 is an exploded schematic diagram showing the main structure of an embodiment of a condensate flash energy recovery device 6 as the core of a condensate flash energy recovery system. Figure 3 As shown, the condensate flash evaporation energy recovery device 6 includes a rotor 602 , an outer cylinder 603 , an upper end cover 604 and a lower end cover 605 .

[0021] The upper end cover 604 and the lower end cover 605 are respectively connected to the two ends of the outer cylinder 603, and the connection methods include but are not limited to welding. The upper end cover 604, the lower end cover 605 and the outer cylinder 603 jointly define an inner cavity. The upper end cover 604 is provided with a condensate inlet 606 and a condensate flash outlet 607 connected to the inner cavity, and the condensate inlet 606 and the condensate flash outlet 607 are respectively located on two opposite sides of the center of the upper end cover; the lower end cover 605 is provided with a pressurized flash return water outlet 609 and a flash return water inlet 608 connected to the inner cavity, and the pressurized flash return water outlet 609 and the flash return water inlet 608 are respectively located on two opposite sides of the center of the lower end cover, and the pressurized flash return water outlet 609 and the condensate inlet 606 are on the same side, and the flash return water inlet 608 and the condensate flash outlet 607 are on the same side.

[0022] The rotor 602 is rotatably disposed around its own central axis in an inner cavity defined by the upper end cover 604, the lower end cover 605 and the outer cylinder 603. The rotor 602 is provided with an even number of spiral channels 601 passing through the rotor axially, and the even number of spiral channels 601 are evenly distributed along the circumferential direction of the rotor.

[0023] The rotor 602 includes a rotor body 6021 and a rotor shaft (not shown). The rotor body 6021 is provided with a central through hole 6020 that penetrates along the axial direction of the rotor body, and an even number of spiral channels 601 are provided on the rotor body 6021 and evenly surround the central through hole 6020. The rotor shaft passes through the central through hole 6020 and is connected to the rotor body 6021 to rotate synchronously with the rotor body 6021.

[0024] An upper end cover shaft hole 6040 is provided at the center of the upper end cover 604, and a lower end cover shaft hole 6050 is provided at the center of the lower end cover 605, and the two ends of the rotor shaft are rotatably disposed in the upper end cover shaft hole 6040 and the lower end cover shaft hole 6050, respectively. In this embodiment, the upper end cover shaft hole 6040 and the lower end cover shaft hole 6050 are through holes, and the two ends of the rotor shaft pass through the upper end cover shaft hole 6040 and the lower end cover shaft hole 6050, respectively, and are rotatably supported on an outer cover (not shown in the figure). In other embodiments, the upper end cover shaft hole 6040 and the lower end cover shaft hole 6050 are blind holes, and the two ends of the rotor shaft are rotatably supported in the upper end cover shaft hole 6040 and the lower end cover shaft hole 6050, respectively.

[0025] In this embodiment, the lead S and the diameter D of the spiral line of each spiral channel 601 are 0 The following conditions are met: L / 24≤S≤L / 4, D / 3≤D 0 ≤2D / 3, L is the rotor length, unit is m, D is the rotor diameter, unit is m.

[0026] In this embodiment, the number n of spiral channels is:

[0027]

[0028] p1 is the pressure of the flash return water flowing into the flash return water inlet 608, unit is Pa, p2 is the pressure of the flash condensed water output from the condensed water flash outlet 607, unit is Pa, and n is rounded up to an even number.

[0029] Preferably, the diameter d of each spiral channel 601 is:

[0030]

[0031] The unit of d is m, Q is the volume flow rate of condensate flowing into the condensate inlet under working conditions, in m 3 / h, C is the orifice flow coefficient, which is determined by the Reynolds number and the aperture ratio. For the specific calculation process, please refer to the industry standard "HG / T20570.15-95 Setting of Pipeline Flow Limiting Orifice Plate", which is usually taken as 0.63, n is the number of spiral channels, p1 is the pressure of the flash return water flowing into the flash return water inlet 608, the unit is pa, p2 is the pressure of the flash condensed water output from the condensate flash outlet 607, the unit is pa, γ is the relative density of the condensed water flowing into the condensed water inlet under the working state, γ is equal to ρ1 / ρ2, ρ1 is the density of the condensed water flowing into the condensed water inlet under the working state, and ρ2 is the density of 4℃ water.

[0032] In a specific embodiment, the number of spiral channels 601 is 8, the diameter d of each spiral channel 601 is equal to 10 mm, the lead S of the spiral line where each spiral channel 601 is located is 350 mm, and the spiral line diameter D 0 It is 150mm.

[0033] Preferably, the even number of spiral channels 601 have the same size and shape, that is, the channel diameter, channel height, spiral line parameters, and spiral direction are all the same. The spiral direction of the even number of spiral channels 601 can be the same clockwise or counterclockwise.

[0034] Preferably, the rotor 602 is made of industrial ceramics through precision machining. Since the ceramic material is resistant to cavitation and has a hardness three times that of steel, the service life of the device is greatly extended.

[0035] The rotor 602 is provided with a spiral channel structure, so that when high-pressure condensate flows into the condensate inlet, a tangential force is generated on the rotor, pushing the rotor to rotate. In addition, the rotor 602 is made of industrial ceramic material, which can effectively alleviate problems such as vibration and wear caused by cavitation, and has strong stability, long service life and low maintenance cost.

[0036] Figure 2 A flow chart of a condensate flash energy recovery system according to an embodiment of the present invention is shown. The system includes a condensate flash energy recovery device 6, a flash tank 2, and a compressor 4. The inlet of the flash tank 2 is connected to the condensate flash outlet 607 of the condensate flash energy recovery device 6, the liquid phase outlet of the flash tank 2 is connected to the flash return water inlet 608 of the condensate flash energy recovery device 6, and the gas phase outlet of the flash tank is connected to the inlet of the compressor 4 for discharging flash steam to the compressor; the outlet of the compressor 4 is connected to the steam network 8, and the compressor 4 can control the pressure of the flash tank 2, and compress the flash steam discharged from the flash tank 2 and discharge it to the steam network 8. The compressor 4 is preferably a high-pressure ratio twin-screw compressor.

[0037] The condensate flash energy recovery device 6 is used to flash the condensate from the steam-using equipment 7 and pressurize the low-pressure flash return water from the flash tank 2, and allow the flashed condensate to enter the flash tank 2. The flash tank 2 flashes the flash condensate from the condensate flash energy recovery device 6, discharges the low-pressure flash return water to the condensate flash energy recovery device 6, and discharges the flash steam.

[0038] Among them, the condensate inlet 606 of the condensate flash energy recovery device 6 is used to receive high-pressure condensate input from the outside (from the steam-using equipment 7 in this embodiment), the flash return water inlet 608 of the condensate flash energy recovery device 6 is used to receive low-pressure flash return water from the flash tank 2, and the pressurized flash return water outlet 609 of the condensate flash energy recovery device 6 is connected to the condensate pipe network 9. The rotor 602 of the condensate flash energy recovery device 6 is used to rotate under the drive of the high-pressure condensate, so that the pressure energy of the high-pressure condensate in half of the spiral channel can be transferred to the low-pressure flash return water, and the pressurized flash return water is discharged through the pressurized flash return water outlet, and the reduced-pressure condensate in the remaining half of the spiral channel is flash evaporated, and the flashed condensate enters the flash tank 2 through the condensate flash outlet.

[0039] In the condensate flash energy recovery system of this embodiment, the compressor 4 can also be replaced by a jet heat pump 3, the first inlet of the jet heat pump 3 is connected to the gas phase outlet of the flash tank 2, the second inlet of the jet heat pump 3 is used to receive high-pressure steam input from the outside, and the outlet of the jet heat pump 3 is connected to the steam network 8. The jet heat pump 3 uses high-pressure steam as a working fluid to inject the flash steam discharged from the flash tank 2 and discharge it to the steam network 8.

[0040] Figure 4 FIG. 6 is a schematic diagram showing the working principle of a condensate flash evaporation energy recovery device 6 according to an embodiment of the present invention. Figure 3 and Figure 4 As shown, the rotor 602 is the only moving part in the device. The rotor 602 rotates under the drive of the high-pressure condensate, and half of the spiral channel 601 rotates to the pressurized area adjacent to the condensate inlet 606 and the boost flash return water outlet 609 (in Figure 4 When the pressure-increasing zone is indicated by dark black in the figure), this half of the spiral channel 601 is already filled with low-pressure flash return water, and the high-pressure condensate enters this half of the spiral channel 601, directly transferring the pressure energy to the low-pressure flash return water, so that the low-pressure flash return water is pressurized to become pressurized flash return water, and is discharged from the pressurized flash return water outlet 609. At the same time, the high-pressure condensate is depressurized to become low-pressure condensate (depressurized condensate). This is the pressurization process. As the rotor 602 continues to rotate, the above-mentioned half of the spiral channel 601 rotates to the flash zone adjacent to the condensate flash outlet 607 and the flash return water inlet 608 (in the figure). Figure 4When the half spiral channel 601 is filled with low-pressure condensate (flash condensate), the low-pressure condensate (flash condensate) begins to flash due to the density difference with the outlet fluid as the siphon driving force. At this time, the low-pressure flash return water enters the half spiral channel 601 located in the flash zone, so that the flashed condensate is discharged from the condensate flash outlet 607. This is the flash process; then the half spiral channel 601 enters the pressurization zone again from the flash zone to complete a cycle. Under the continuous rotation of the rotor, the pressurization and flash processes are carried out alternately. Since the spiral channel 601 adopts a multi-channel design, it can be ensured that multiple channels are simultaneously pressurized and flashed (that is, half of the spiral channels in the rotor 602 are in the pressurization process, and the remaining half of the spiral channels are in the flash process), and the condensate and flash return water have good feeding and discharge flow stability.

[0041] The main working principle of the above-mentioned pressurization zone is to utilize the incompressibility of liquid, compress the flash return water by high-pressure condensate, and directly transfer the pressure energy of condensate to low-pressure flash return water, so as to realize the direct transfer of "pressure energy-pressure energy", reduce the intermediate links of energy conversion, and thus greatly improve the energy recovery efficiency, generally above 90%. The main working principle of the flash zone is to utilize the orifice plate retention and flash siphon effect, and through the throttling effect of the porous orifice plate (spiral channel) of the system, the low-pressure saturated condensate that has been depressurized is further depressurized, partially vaporized, and begins to flash. The vapor-liquid mixture formed by flash (two-phase flow after flash, the figure shows the bubble d represented by a circle in the flash condensate) gathers in the riser at the outlet of the device (the riser is a vertical pipe connected to the condensate flash outlet 607) and enters the flash tank 2. As the flash evaporation continues, the density at the riser continues to decrease, and the density difference generated by the inlet and outlet fluids of the device forms a siphon driving force to complete the flash evaporation process.

[0042] The condensate flash evaporation energy recovery system and recovery method of the present invention have both flash evaporation and pressurized flash evaporation water return functions, and have high flash evaporation rate, high condensate pressure energy recovery efficiency, compact system structure, high integration level, long service life and strong adaptability to working conditions.

[0043] The present invention is not limited to the above-mentioned embodiments. Any modifications may be made to the above-mentioned embodiments without departing from the spirit of the present invention. These modifications should be considered to be within the scope of the claims of the present invention.

Claims

1. A condensate flash evaporation energy recovery device, characterized in that: It includes an upper end cover, a lower end cover, an outer cylinder and a rotor; The upper end cover and the lower end cover are respectively connected to the two ends of the outer cylinder, and the upper end cover, the lower end cover and the outer cylinder jointly define an inner cavity; the upper end cover is provided with a condensate inlet and a condensate flash outlet communicated with the inner cavity, and the condensate inlet and the condensate flash outlet are respectively located on two opposite sides of the center of the upper end cover; the lower end cover is provided with a pressurized flash return water outlet and a flash return water inlet communicated with the inner cavity, and the pressurized flash return water outlet and the flash return water inlet are respectively located on two opposite sides of the center of the lower end cover, and the pressurized flash return water outlet and the condensate inlet are on the same side, and the flash return water inlet and the condensate flash outlet are located on the same side; The rotor is rotatably arranged in the inner cavity around its own central axis. The rotor is provided with an even number of spiral channels penetrating along the axial direction of the rotor, and the even number of spiral channels are evenly distributed along the circumferential direction of the rotor.

2. The condensate flash evaporation energy recovery device according to claim 1, characterized in that: The lead S and the diameter D0 of the spiral line where each spiral channel is located meet the following conditions: L / 24≤S≤L / 4, D / 3≤D0≤2D / 3, L is the rotor length, and D is the rotor diameter.

3. The condensate flash evaporation energy recovery device according to claim 1, characterized in that: The number n of the spiral channels is: p1 is the pressure of the flash return water flowing into the flash return water inlet, p2 is the pressure of the flash condensed water output from the condensed water flash outlet, and n is rounded upward to an even number.

4. The condensate flash evaporation energy recovery device according to claim 1 or 3, characterized in that: The diameter d of each spiral channel is: Q is the volume flow rate of condensate flowing into the condensate inlet under working conditions, C is the orifice flow coefficient, n is the number of spiral channels, p1 is the pressure of flash return water flowing into the flash return water inlet, p2 is the pressure of flash condensed water output from the condensate flash outlet, γ is the relative density of condensate flowing into the condensate inlet under working conditions, γ is equal to ρ1 / ρ2, ρ1 is the density of condensate flowing into the condensate inlet under working conditions, and ρ2 is the density of 4°C water.

5. The condensate flash evaporation energy recovery device according to claim 1, characterized in that: The even number of spiral channels have the same size and shape.

6. The condensate flash evaporation energy recovery device according to claim 1, characterized in that: The rotor comprises a rotor body and a rotor shaft; the rotor body is provided with a central through hole extending axially through the rotor body, the even number of spiral channels are arranged on the rotor body and surround the central through hole; the rotor shaft passes through the central through hole and is connected to the rotor body; An upper end cover shaft hole is provided at the center of the upper end cover, a lower end cover shaft hole is provided at the center of the lower end cover, and both ends of the rotor shaft are rotatably arranged in the upper end cover shaft hole and the lower end cover shaft hole respectively.

7. The condensate flash evaporation energy recovery device according to claim 1, characterized in that: The material of the rotor is industrial ceramics.

8. A condensate flash evaporation energy recovery system, characterized in that: It comprises a flash tank and a condensate flash energy recovery device as claimed in any one of claims 1 to 7; The inlet of the flash tank is communicated with the condensate flash outlet of the condensate flash energy recovery device, the liquid phase outlet of the flash tank is communicated with the flash return water inlet of the condensate flash energy recovery device, and the gas phase outlet of the flash tank is used to discharge flash steam; The condensate inlet of the condensate flash evaporation energy recovery device is used to receive high-pressure condensate input from the outside, and the flash return water inlet of the condensate flash evaporation energy recovery device is used to receive low-pressure flash return water from the flash tank. The rotor of the condensate flash evaporation energy recovery device is used to rotate under the drive of the high-pressure condensate, so that the pressure energy of the high-pressure condensate in half of the spiral channel can be transferred to the low-pressure flash return water, and the pressurized flash return water is discharged through the pressurized flash return water outlet, and the reduced-pressure condensate in the remaining half of the spiral channel is flash evaporated, and the flashed condensate enters the flash tank through the condensate flash outlet.

9. The condensate flash evaporation energy recovery system according to claim 8, characterized in that: The pressurized flash evaporation return water outlet of the condensate flash evaporation energy recovery device is connected to the condensate pipe network.

10. The condensate flash evaporation energy recovery system according to claim 8, characterized in that: The condensate flash evaporation energy recovery system further comprises a jet heat pump, a first inlet of the jet heat pump is communicated with a gas phase outlet of the flash tank, and an outlet of the jet heat pump is communicated with a steam network.

11. The condensate flash evaporation energy recovery system according to claim 8, characterized in that: It also includes a compressor, the inlet of the compressor is connected to the gas phase outlet of the flash tank, and the outlet of the compressor is connected to the steam pipeline network.

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