Method and device for recycling dead steam of high-temperature condensate water system of cut tobacco dryer

Abstract

The invention provides a steam exhaust recycling method for a high-temperature condensate water system of a cut-tobacco dryer and an energy-saving device for implementing the method. Softened water is indirectly discharged from a motor vehicle, the flow of the softened water is controlled by using a softened water regulating valve, the softened water is pressurized and pumped into a recycling tank, and the softened water is atomized at the top in the tank and then is uniformly distributed on a filler section through a spraying disc; the mixed liquid obtained after mixing and condensation falls into a liquid storage area to be collected, and then the mixed liquid is pressurized and pumped to a condensation water pipe network to be recycled; and the top outlet of the tank body is communicated with the external atmosphere through an emptying pipeline. The waste steam can be effectively recycled and then utilized, the energy consumption index of the cut-tobacco drier is reduced, and energy conservation and environmental protection are achieved.

Description

Technical Field

[0001] The invention relates to a method and device for recovering and utilizing exhaust steam from a high-temperature condensed water system of a tobacco cut drying machine used in tobacco cut production. Background Art

[0002] With increasing global energy consumption and intensifying global climate change, public awareness of sustainable development and environmental protection continues to grow, making energy conservation and emission reduction crucial for business development. In tobacco cut tobacco production, the existing cut tobacco drying machine steam system directly discharges exhaust steam generated by condensate recovery in the condensate tank into the atmosphere, resulting in wasted heat energy and negatively impacting energy conservation and emission reduction, as well as the company's economic benefits and social image. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention proposes a method for recovering and utilizing the exhaust steam of the high-temperature condensate water system of a tofu drying machine, which can effectively recover and utilize the exhaust steam, reduce the energy consumption index of the tofu drying machine, and achieve energy saving and environmental protection. The present invention also proposes an energy-saving device for implementing this method.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A method for recovering and utilizing exhaust steam from a high-temperature condensate system of a silk drying machine. Saturated steam, serving as the heat source of the silk drying machine steam system in a silk-making workshop, completes heat exchange and is converted into condensate. The condensate is then separated into condensate and exhaust steam in a flash tank. The condensate is pumped into a condensate pipe network, and the exhaust steam is discharged into the silk drying machine exhaust pipe. The characteristics of this method are:

[0006] A recovery tank is provided, and the space inside the tank is divided into two areas, the upper area being a mixing and exchange area, and the lower area being a liquid storage area. A shower tray and a packing section located below the shower tray are provided in the mixing and exchange area, and the packing section is used to provide a carrier for mass and heat transfer for the contact between the gas and liquid phases. In the mixing and exchange area, the exhaust steam transported by the exhaust pipe of the tofu drying machine is introduced into the tank from the middle of the tank body, and the softened water is pressurized by a water pump and introduced from the center of the top of the tank body, and after being atomized, it is evenly distributed in the packing section through the shower tray. The descending atomized liquid droplets are in reverse continuous contact with the ascending exhaust steam, and fully exchange heat and mass in the packing section. The mixed liquid falls into the liquid storage area, is collected, and is then pressurized and pumped to the condensate network for recovery. The top outlet of the tank body is connected to the external atmosphere through a vent pipe.

[0007] The softened water comes from the sodium ion exchanger in the power plant, and the flow rate is adjustable.

[0008] The characteristics of the method for recovering and utilizing the exhaust steam from the high-temperature condensate water system of a tofu drying machine proposed by the present invention are:

[0009] The flow rate of the softened water to be introduced into the recovery tank is adjusted by the softened water regulating valve, and the temperature of the mixed liquid is adjusted by adjusting the flow rate of the softened water.

[0010] The present invention also proposes an energy-saving device for recycling exhaust steam from a high-temperature condensed water system of a tofu drying machine, which is used to implement the above-mentioned method for recycling exhaust steam from a high-temperature condensed water system of a tofu drying machine. The energy-saving device comprises:

[0011] The exhaust steam inlet pipeline is used to pass the exhaust steam separated from the flash tank into the recovery tank through the steam inlet in the middle of the tank body;

[0012] Softened water delivery pipeline, used to pump softened water to the atomizing nozzle in the middle of the top of the recovery tank;

[0013] Mixed liquid output pipeline, used to pump the mixed liquid under pressure to the condensate network;

[0014] The recovery tank is connected to the external atmosphere through a vent pipe at the top outlet of the tank body. The tank is divided into an upper mixing exchange area and a lower liquid storage area by the height of the exhaust steam inlet; the mixing exchange area is provided with atomizing nozzles, shower trays, and packing sections from top to bottom. The atomizing nozzle is centrally arranged at the top of the tank to atomize the softened water fed into the tank and increase the steam-water heat exchange area. The shower tray is located between the atomizing nozzle and the packing section to receive the falling atomized droplets and evenly shower them onto the packing section below. The packing section is provided with at least one layer of packing; a pressure gauge is provided on the upper part of the recovery tank body; a liquid level meter and a temperature detection element are respectively provided in the areas of the tank body corresponding to the liquid storage area. The real-time liquid level of the mixed liquid in the tank is detected by the liquid level meter, and the real-time temperature of the mixed liquid in the tank is detected and displayed by the temperature detection element.

[0015] The energy-saving device for recycling exhaust steam from the high-temperature condensate water system of a tofu drying machine of the present invention adopts a three-stage absorption structure of spraying, water film, and filler, and uses low-temperature water to completely absorb the exhaust steam. Its structural characteristics are:

[0016] The recovery tank is a normal pressure container made of 316L stainless steel, with a diameter of 800mm and dimensions of 1700mm×800mm×2600mm. It has a design pressure of 0.098Mpa, a design temperature of 150°C, and an operating temperature of 90°C. The tank is equipped with a steam inlet, exhaust steam outlet, spray water inlet, water outlet, sewage outlet, liquid level gauge interface, nozzle inspection port, tank body inspection port, thermometer, and temperature change interface.

[0017] Among them, the exhaust steam outlet is located at the top of the tank body and is connected to the vent pipe through a pipe with a stop valve. This stop valve is normally open to keep the inside of the tank connected to the external atmosphere.

[0018] The temperature detection elements configured in the recovery tank are thermal resistors and thermometers, which are used to detect the real-time temperature value of the mixed liquid in the tank.

[0019] The atomizing nozzle is made of 316L stainless steel and includes a coaxially mounted fixed cylinder and a movable cylinder. The softened water is received through the axial end of the water inlet side. The fixed cylinder is axially passed through, and the movable cylinder is slidably mounted in the fixed cylinder along the axial direction, leaving a radial gap between the movable cylinder and the fixed cylinder to form a ring cavity. A spring is built into the ring cavity, and the spring is coaxially mounted on the movable cylinder and axially tensioned between the movable cylinder and the fixed cylinder. The axial end of the movable cylinder on the water inlet side is open, and the axial end on the water outlet side is encapsulated by a blind plate. The cylinder body is divided into a water inlet section and a water outlet section along the axial direction from the water inlet side to the water outlet side. The length of the water inlet section is greater than that of the water outlet section. The outer peripheral wall of the water inlet section is closed, and a number of atomizing holes are evenly spaced on the outer peripheral wall of the water outlet section. When the spring is in a natural state, the two axial ends of the movable cylinder and the fixed cylinder are flush. After softened water is introduced into the movable cylinder from the water inlet side, the movable cylinder can rely on the pressure of the softened water to slide toward the water outlet side until some or all of the atomizing holes in the water outlet section are exposed outside the fixed cylinder. Several atomizing holes are evenly spaced around the circumference and evenly spaced layer by layer along the axial direction. This atomizing nozzle has a simple design, reliable performance, long life, and self-adjusting function. It can discharge water at a constant rate under all operating conditions with low pressure drop, thus achieving good atomization in all operating conditions from zero water inlet to full load.

[0020] The inner wall of the fixed cylinder is provided with a circle of radially protruding lower plugs at the end of the water outlet side, and the outer wall of the movable cylinder is provided with a circle of radially outward-turned upper plugs at the end of the water inlet side. The upper plugs maintain sliding contact with the inner wall of the fixed cylinder as the movable cylinder moves. The two axial ends of the annular cavity are respectively sealed by the upper plugs and the lower plugs.

[0021] A vertical mounting nozzle is located in the center of the tank's top. The lower end of this nozzle houses an atomizing nozzle, while the upper end serves as a nozzle inspection port for maintenance. The side of the nozzle connects to the spray inlet. The atomizing nozzle's inlet is attached to the nozzle via a flange on the fixed cylinder shaft end, bolted to the nozzle via a pressure strip. It can be removed from the outside of the tank, making maintenance easy.

[0022] The shower tray is a plate-like structure, which is separated horizontally in the tank body. A number of short channels are formed on the tray body, which are regularly distributed around the center line of the tank body and vertically penetrate the tank body. The atomized droplets formed by the softened water passing through the atomizing nozzle fall evenly to the filling section through the short channels.

[0023] Furthermore, the pan is equipped with several short vertical tubes, symmetrically distributed around the centerline of the tank, serving as short passages. Multiple 60mm long DN50 stainless steel short tubes are inserted through the shower tray. These short tubes are arranged in groups, evenly spaced along a hexagonal outline. Each group has a 150mm spacing between adjacent short tubes. The groups are radially offset equidistantly on the pan surface, centered around the tank centerline, with a single short tube positioned centered on the tank centerline. The shower tray is constructed of 6mm thick 316L stainless steel with an outer diameter of 798mm.

[0024] The packing section features two layers of packing, each 100mm thick. Each layer consists of a circular stainless steel mesh sheet set within a circular support ring. The packing sheet is then attached to the inner wall of the tank body and spaced horizontally within the tank body via the support ring. Multiple layers of packing sheets are spaced along the height of the tank body to form a single layer of packing. The support ring has an outer diameter of 798mm and an inner diameter of 698mm, and the outer diameter of the stainless steel mesh matches the inner diameter of the support ring.

[0025] The softened water pumped to the recovery tank is atomized by the atomizing nozzle and sprayed onto the shower plate and the area above the shower plate. As it falls, the atomized liquid drops onto the shower plate and gradually accumulates. Then it falls through the short channels on the shower plate and is evenly distributed on the packing section below, forming a water film on the packing section.

[0026] The exhaust steam introduced into the recovery tank rises; in the packing section, the contact area and contact time between the gas and liquid are increased by the packing, which promotes the transfer and exchange of heat, fully exchanges heat and mass, and realizes the cooling of the exhaust steam; the remaining exhaust steam that continues to rise through the shower tray has been cooled in the packing section before, and is further mixed with the atomized liquid droplets in the atomization area above the shower tray and condensed before falling to the shower tray, and then falls through the short channel of the shower tray, and falls into the liquid storage area after passing through the packing section.

[0027] The exhaust steam pipe of the tofu drying machine forms two branches with stop valves, one of which is connected to the vent pipe, and the other branch serves as the exhaust steam inlet pipe and is connected to the steam inlet in the middle of the recovery tank body; the stop valves on the two branches are opened and closed respectively; when the stop valve on the exhaust steam inlet pipe is normally open, the stop valve on the other branch is normally closed; when the stop valve on the exhaust steam inlet pipe is closed, the stop valve on the other branch is opened.

[0028] The softened water delivery pipeline includes a softened water main and a softened water bypass connected in parallel with the softened water main; the softened water main is connected to the spray water inlet in the middle of the top of the recovery tank body, and a softened water regulating valve and two butterfly valves located on both sides of the softened water regulating valve are provided on the pipe section connected in parallel with the softened water bypass; a butterfly valve is also provided on the softened water bypass.

[0029] The mixed liquid output pipeline forms two mixed liquid output branches in parallel, two butterfly valves are respectively arranged on each mixed liquid output branch, and a pressurized water pump, a pressure gauge, and a check valve are arranged in sequence along the flow direction between the two butterfly valves. The input ends of the two mixed liquid output branches converge to form a mixed liquid input side pipeline, which is connected to the water outlet at the bottom of the recovery tank body through the mixed liquid input side pipeline. The output ends of the two mixed liquid output branches converge to form a mixed liquid output side pipeline, and the mixed liquid is sent into the condensate water network through the mixed liquid output side pipeline with a flow meter and a butterfly valve.

[0030] The system also includes a drain line with a ball valve, which is connected in parallel to the mixed liquid input line and connected to the water outlet of the recovery tank. The drain line is used when the tank is first cleaned or emptied during maintenance.

[0031] Configure a PLC automatic control cabinet and connect various electric valves, water pumps, flow meters, temperature and liquid level instruments to the PLC automatic control cabinet.

[0032] In order to maintain good water quality, PE pipes are used as the pipe material.

[0033] Compared with the existing technology, the beneficial effects of the present invention are embodied in:

[0034] The present invention uses softened water to be pressurized by a water pump, flow controlled by a valve, atomized by a nozzle, and distributed by a shower tray, and then fully realizes a heat and mass exchange process with the exhaust steam between the fillers. The mixed liquid is then pressurized by a water pump and recovered to the condensate water pipe network system for reuse, which can effectively recover the exhaust steam. The system has strong adaptability, reduces the energy consumption and waste emissions of the cigarette factory, improves the resource utilization efficiency, and helps enterprises reduce production costs, enhance the environmental image of the enterprise, and improve competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural schematic diagram of the present invention;

[0036] Figure 2 It is a schematic diagram of the internal structure of the recovery tank;

[0037] Figure 3 This is a structural diagram of the recovery tank from another perspective;

[0038] Figure 4 It is a structural diagram of the shower tray;

[0039] Figure 5 is a schematic structural diagram of a filler support member;

[0040] Figure 6 It is a structural diagram of an atomizing nozzle;

[0041] Figure 7 It is a structural diagram of the atomizing nozzle working state.

[0042] In the picture:

[0043] 1. Saturated steam main pipe; 2. Flowmeter; 3. Steam-water separator; 4. Steam trap; 5. Rotating drum; 6. Heat exchanger; 7. Flash tank; 8. Pressurized water pump; 9. Condensate pipe network; 10. Tofu drying machine exhaust pipe; 101. Exhaust steam inlet pipe; 11. Vent pipe; 12. Softened water delivery pipe; 121. Softened water main pipe; 122. Softened water bypass; 13. Softened water regulating valve; 14. Butterfly valve; 15. Recovery tank; 16. Liquid level gauge; 17. Pressure gauge; 18. Thermal resistor; 19. Thermometer; 20. Mixed liquid output branch; 21. Check valve; 22. Stop valve; 23. Mixed liquid input side pipe; 24. Mixed liquid output side pipe; 25. Ball valve; 26. Drain pipe.

[0044] 31 Steam inlet; 32 Exhaust steam outlet; 33 Spray water inlet; 34 Water outlet; 35 Sewage outlet; 36 Liquid level gauge interface; 371 Installation nozzle; 372 Nozzle inspection port; 38 Tank body inspection port; 39 Thermometer and temperature change interface;

[0045] 4 atomizing nozzle; 41 fixed cylinder; 411 lower plug; 412 flange; 42 movable cylinder; 421 blind plate; 422 water inlet section; 423 water outlet section; 424 atomizing hole; 425 upper plug; 43 spring; 44 bolt; 45 pressure strip;

[0046] 5 shower tray; 51 short tube;

[0047] 6: packing section; 61: support ring plate; 62: stainless steel mesh. DETAILED DESCRIPTION

[0048] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0049] Figure 1 The diagram shows the original tofu dryer steam system and the exhaust steam recovery system of this embodiment, which was newly added. In the original tofu dryer steam system, saturated steam transported by the saturated steam main enters the steam-water separator, where its pressure is adjusted. It then enters the rotary drum to dry the material and the heat exchanger to heat the air. This condensate then enters the flash tank, where it is pressurized by a condensate pump and fed into the condensate network. The flash steam is then discharged directly into the air from the roof of the plant.

[0050] This embodiment is applied to the exhaust steam recovery of the steam system of the drum drying equipment in the silk-making workshop of a cigarette factory. Softened water is discharged from the power locomotive, the flow rate is controlled by a softened water regulating valve, and the water is pressurized and pumped into a recovery tank. Atomized spraying is performed on the top of the tank. The atomized softened water is mixed with the flash steam of the condensate from the silk drying machine to exchange matter and heat. The temperature of the mixed liquid is controlled at about 85°C, and then the mixed liquid is sent to the condensate network for recovery by a pressurized water pump.

[0051] In specific implementation, the exhaust steam recovery method of the high-temperature condensate water system of the tobacco drying machine can recover 60kg / h of exhaust steam, which means saving water, and recovering 2300kj / kg of heat, with a total heat of 138MJ / h, reducing the steam consumption per unit tobacco of the tobacco drying machine.

[0052] Regarding the amount of softened water: the flash steam volume of the tofu drying machine is 0.227t / h, its calorific value is 2679.6kj / kg, the spray softened water is at a temperature of 25℃, an enthalpy value of 104.8kj / kg, and the outlet mixed liquid is at 90℃ and 376.9kj / kg, so the required softened water volume is 1.92t / h. On this basis, considering the production fluctuations, operation adjustments, safety margins and other margins, the softened water is calculated at 3t / h.

[0053] The flow of the wire drying machine can be monitored. When the average flow reaches the set value for more than a specified period of time, the energy-saving device for recovering and utilizing the exhaust steam of the high-temperature condensate water system of the wire drying machine of this embodiment starts to operate, and the softened water pump is started. The condensate flash steam generated during the operation of the wire drying machine is cooled by using softened water and recovered to the deoxygenation water tank in the boiler room.

[0054] Tests have shown that the amount of flash steam generated during tofu drying is relatively small. Therefore, the opening of the butterfly valve in the softened water supply pipeline used for heat recovery should not be too large. Otherwise, the return water temperature will be too low, and upon entering the condensate network, it will merge with the high-temperature condensate, which can easily cause water hammer. Based on the test results, the opening of the butterfly valve in the softened water supply pipeline was set for recovery tank temperatures below 80°C, 80-85°C, 85-90°C, and above 90°C.

[0055] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A method for recovering and utilizing exhaust steam from a high-temperature condensate system of a tow dryer. Saturated steam, serving as the heat source in the tow dryer steam system of a tow workshop, undergoes heat exchange to convert into condensate. This condensate is then separated into condensate and exhaust steam in a flash tank. The condensate is pumped into a condensate pipe network, and the exhaust steam is discharged into the tow dryer exhaust pipe. The method is characterized by: A recovery tank is provided, and the space inside the tank is divided into two areas, the upper area being a mixing and exchange area, and the lower area being a liquid storage area. The mixing and exchange area is provided with a shower tray and a packing section below the shower tray. In the mixing and exchange area, exhaust steam transported by the exhaust pipe of the tofu drying machine is introduced into the tank from the middle of the tank body, and softened water is pressurized by a water pump and introduced from the center of the top of the tank body. After being atomized, it is evenly distributed in the packing section through the shower tray. The descending atomized liquid droplets continuously contact the ascending exhaust steam in the reverse direction, and fully exchange heat and mass in the packing section. The mixed liquid falls into the liquid storage area, is collected, and is then pressurized and pumped to the condensate network for recovery. The top outlet of the tank body is connected to the external atmosphere through a vent pipe. The softened water comes from the power plant and its flow rate is adjustable.

2. The method for recovering and utilizing exhaust steam from a high-temperature condensate water system of a tofu drying machine according to claim 1, wherein: The flow rate of softened water to be introduced into the recovery tank is regulated by the softened water regulating valve.

3. An energy-saving device for recycling exhaust steam from a high-temperature condensate water system of a tofu drying machine, characterized by: The method for recovering and utilizing exhaust steam from a high-temperature condensate water system of a tofu drying machine according to any one of claims 1 to 2 comprises: The exhaust steam inlet pipeline is used to pass the exhaust steam separated from the flash tank into the recovery tank through the steam inlet in the middle of the tank body; Softened water delivery pipeline, used to pump softened water to the atomizing nozzle in the middle of the top of the recovery tank; Mixed liquid output pipeline, used to pressurize and pump the mixed liquid in the tank to the condensate pipe network; The recovery tank is connected to the external atmosphere through a vent pipe at the top outlet of the tank body. The tank is divided into an upper mixing exchange area and a lower liquid storage area by the height of the exhaust steam inlet; the mixing exchange area is provided with atomizing nozzles, shower trays, and packing sections from top to bottom. The atomizing nozzle is centrally arranged at the top of the tank for atomizing the softened water fed into the tank. The shower tray is located between the atomizing nozzle and the packing section for receiving the falling atomized droplets and evenly showering them onto the packing section below. The packing section is provided with at least one layer of packing; the liquid storage area is used to store the mixed liquid formed by the mixing and condensation of the exhaust steam and softened water.

4. The energy-saving device for recycling exhaust steam from a high-temperature condensate water system of a tofu drying machine according to claim 3 is characterized by: The atomizing nozzle includes a fixed cylinder and a movable cylinder which are coaxially mounted. The softened water is received through the axial end of the water inlet side. The fixed cylinder is axially passed through. The movable cylinder is slidably mounted in the fixed cylinder along the axial direction. A gap is left radially between the movable cylinder and the fixed cylinder to form a ring-shaped cavity. A spring is built into the ring-shaped cavity. The spring is coaxially mounted on the movable cylinder and is axially tensioned between the movable cylinder and the fixed cylinder. The axial end of the movable cylinder on the water inlet side is open, and the axial end on the water outlet side is encapsulated by a blind plate. The cylinder body is divided into a water inlet section and a water outlet section along the axial direction from the water inlet side to the water outlet side. The length of the water inlet section is greater than that of the water outlet section. The outer peripheral wall of the water inlet section is closed. A number of atomizing holes are evenly spaced on the outer peripheral wall of the water outlet section. When the spring is in a natural state, the two axial ends of the movable cylinder and the fixed cylinder are flush. After softened water is introduced into the movable cylinder from the water inlet side, the movable cylinder can slide toward the water outlet side by relying on the pressure of the softened water until some or all of the atomizing holes in the water outlet section are exposed outside the fixed cylinder.

5. The energy-saving device for recycling exhaust steam from a high-temperature condensate water system of a tofu drying machine according to claim 3 is characterized by: The shower tray is a plate-like structure, which is separated horizontally in the tank body. A number of short channels are formed on the tray body, which are regularly distributed around the center line of the tank body and vertically penetrate the tank body. The atomized droplets formed by the softened water passing through the atomizing nozzle fall evenly to the filling section through the short channels.

6. The method for recovering and utilizing exhaust steam from a high-temperature condensate water system of a tofu drying machine according to claim 3, wherein: The recovery tank body is equipped with a liquid level gauge and a temperature detection element in the area corresponding to the liquid storage area. The real-time liquid level of the mixed liquid in the tank is detected by the liquid level gauge, and the real-time temperature of the mixed liquid in the tank is detected and displayed by the temperature detection element. The recovery tank is equipped with a thermal resistor and a thermometer as the temperature detection elements.

7. The energy-saving device for recycling exhaust steam from a high-temperature condensate water system of a tofu drying machine according to claim 3 is characterized by: The exhaust steam pipe of the tofu drying machine forms two branches with stop valves, one of which is connected to the vent pipe, and the other branch serves as the exhaust steam inlet pipe and is connected to the steam inlet in the middle of the recovery tank body.

8. The energy-saving device for recycling exhaust steam from a high-temperature condensate water system of a tofu drying machine according to claim 3 is characterized by: The softened water delivery pipeline includes a softened water main and a softened water bypass connected in parallel with the softened water main; the softened water main is connected to the spray water inlet in the middle of the top of the recovery tank body, and a softened water regulating valve and two butterfly valves located on both sides of the softened water regulating valve are provided on the pipe section connected in parallel with the softened water bypass; a butterfly valve is also provided on the softened water bypass.

9. The energy-saving device for recycling exhaust steam from a high-temperature condensate water system of a tofu drying machine according to claim 3, characterized in that: The mixed liquid output pipeline forms two mixed liquid output branches in parallel, two butterfly valves are respectively arranged on each mixed liquid output branch, and a pressurized water pump, a pressure gauge, and a check valve are arranged in sequence along the flow direction between the two butterfly valves. The input ends of the two mixed liquid output branches converge to form a mixed liquid input side pipeline, which is connected to the water outlet at the bottom of the recovery tank body through the mixed liquid input side pipeline. The output ends of the two mixed liquid output branches converge to form a mixed liquid output side pipeline, and the mixed liquid is sent into the condensate water network through the mixed liquid output side pipeline with a flow meter and a butterfly valve.

10. The energy-saving device for recycling exhaust steam from a high-temperature condensate water system of a tofu drying machine according to claim 9, characterized in that: It also includes a sewage discharge pipeline with a ball valve, which is connected in parallel with the mixed liquid input side pipeline and is connected to the water outlet of the recovery tank.

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