Boiler drainage device

Abstract

The utility model provides a boiler drainage device. The boiler drainage device comprises a steam pocket, a drainage expansion device and a heat pump which are sequentially connected in series. The heat pump is further connected with the heat energy utilization device and the raw water tank. The drain water expansion device is further connected with the steam superheater and the deaerator, and the deaerator is further connected with the water supply tank. According to the device, the heat pump is arranged to recycle heat in the expanded sewage, hot water obtained after the heat pump recycles energy is input into the raw water tank to be recycled, and in addition, steam generated after expansion is used in the deaerator to deoxidize boiler water. According to the device, through cooperative use of the equipment, energy in steam and hot water obtained after boiler drain water is expanded is recycled, and the defect that energy is wasted due to the fact that heat of the expanded hot water is not fully utilized in a traditional method is overcome.

Description

Technical Field

[0001] The present application relates to the technical field of boiler sewage discharge, and in particular to a boiler drain device. Background Art

[0002] In power plants, although boiler feed water has been treated with chemical water, it still contains a certain amount of salt. The steam-water separation process in the steam drum will cause the steam machinery to carry a certain amount of water. In addition, as the pressure rises, the salt-dissolving capacity of saturated steam increases, which will cause steam pollution. When the salt carried in the steam is deposited on the wall of the superheater tube, it will increase the flow resistance and thermal resistance, affect heat transfer, and even cause overheating damage to the tube wall; if the salt is deposited at the valve, it will cause the valve to leak or get stuck; if the molten salt is deposited in the flow part of the turbine, it will increase the axial thrust and blade stress, and reduce the efficiency of the turbine.

[0003] Therefore, in order to ensure the safe operation of boilers and steam turbines, the quality of boiler water is often controlled by discharging blowdown during the operation of drum boilers, that is, discharging part of the contaminated boiler water. Boiler blowdown is generally divided into continuous blowdown and periodic blowdown. Continuous blowdown refers to the continuous discharge of part of the boiler water during the operation of drum boilers. The continuous blowdown of boilers is not only large in volume, but also has a high temperature of the discharged boiler water. If it is discharged directly, it will cause a large heat loss and waste of water resources.

[0004] In actual operation, drum boilers generally recover part of the working fluid and heat through the blowdown expansion tank system. The drain water of many units' expansion tanks is discharged into the ditch after cooling, and no blowdown cooler is set to recover this part of the heat. The drain water temperature of the expansion tank is generally above 100℃, and can even reach 180℃. Direct discharge will still cause certain heat loss. Utility Model Content

[0005] The present application provides a boiler drain device, which is used to solve the problem that the existing method of processing boiler drain fails to fully recover the heat in the boiler drain, resulting in energy waste.

[0006] The present application provides a boiler drain device, comprising a steam drum, a drain expansion device and a heat pump connected in series in sequence;

[0007] The heat pump is also connected to the heat energy utilization device and the raw water tank respectively;

[0008] The drain expansion device is also connected to the steam superheater and the deaerator respectively, and the deaerator is also connected to the water supply tank.

[0009] Optionally, the hydrophobic expansion device includes an expansion tank and a buffer water tank;

[0010] The top of the expansion tank is provided with a steam exhaust port, the bottom is provided with a liquid exhaust port, a balance port is provided on one side wall of the upper part of the expansion tank, a liquid inlet is installed on the expansion tank, and a liquid remover is installed on the top of the expansion tank;

[0011] The steam exhaust port is connected to the steam superheater and the deaerator;

[0012] The drain port and the balance port are connected to the buffer water tank;

[0013] The liquid inlet is connected to the steam drum.

[0014] Optionally, the liquid inlet device comprises an annular liquid inlet main pipe arranged outside the expansion vessel;

[0015] The liquid inlet main pipe is connected to a plurality of liquid inlet branch pipes passing through the side wall of the expansion vessel through a plurality of valves;

[0016] The portion of the liquid inlet branch pipe extending into the expansion vessel is an outwardly expanding trumpet-shaped structure.

[0017] Optionally, the deaerator comprises a deaerator body;

[0018] A plurality of downward spraying mixers are installed inside the deaerator body, and the mixers are respectively connected to the drainage expansion device and the water supply tank;

[0019] A liquid receiving pan is horizontally arranged in the deaerator body, and a plurality of liquid distribution holes are opened at the bottom of the liquid receiving pan, and the liquid receiving pan is located below the mixer;

[0020] A steam distribution pipe is arranged at the bottom of the deaerator body, and the steam distribution pipe is connected to the hydrophobic expansion device.

[0021] Optionally, a plurality of buffer caps are provided on the upper surface of the liquid receiving tray, and the plurality of buffer caps correspond to the positions of the plurality of mixers one by one;

[0022] The buffer cap comprises a supporting column and a conical umbrella surface connected to the top of the supporting column.

[0023] Optionally, the mixer includes a draft tube, a gradually converging transition tube, a mixing chamber and a diffusion tube which are connected in sequence;

[0024] The drainage tube includes an inner tube and an outer tube which are coaxially arranged;

[0025] One end of the outer tube is closed and the other end is connected to the gradually contracting transition tube. The inner tube passes through the closed end of the outer tube and extends into the outer tube, and the output port of the inner tube is close to the gradually contracting transition tube.

[0026] The inner tube is connected with the hydrophobic expansion device, and an opening is arranged on one side of the outer tube and is connected with the water supply tank.

[0027] Optionally, a plurality of steam heating pipes are arranged horizontally at the lower part of the liquid receiving tray;

[0028] One end of the steam heating pipe is closed, and the other end is connected to the hydrophobic expansion device. A plurality of exhaust holes are opened on the side of the steam heating pipe.

[0029] The device of the present application recycles the heat in the sewage after expansion by setting a heat pump, and at the same time inputs the hot water after the heat pump recovers the energy into the raw water tank for recovery. In addition, the steam generated after the expansion is used in the deaerator to deoxygenate the boiler water. The device of the present application recycles the energy in the steam and hot water after the boiler drain expansion through the coordinated use of the above-mentioned equipment, overcoming the disadvantage of the traditional practice of failing to fully utilize the heat of the hot water after the expansion, resulting in energy waste. In addition, the raw water tank in the present application can also recycle hot water, which has the advantage of saving water resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 A schematic diagram of a boiler drain device provided in one embodiment of the present application;

[0032] Figure 2 A schematic diagram of the structure of a hydrophobic expansion device provided in one embodiment of the present application;

[0033] Figure 3 A schematic diagram of the structure of a liquid inlet provided in one embodiment of the present application;

[0034] Figure 4 A schematic diagram of the structure of a deaerator provided in one embodiment of the present application;

[0035] Figure 5 A schematic diagram of the structure of a buffer cap provided in one embodiment of the present application;

[0036] Figure 6 A schematic diagram of the structure of a mixer provided in one embodiment of the present application.

[0037] Description of reference numerals:

[0038] 1. Steam drum; 2. Drain expansion device; 3. Heat pump; 4. Heat energy utilization device; 5. Raw water tank; 6. Steam superheater; 7. Deaerator; 8. Water supply tank; 21. Expansion tank; 22. Buffer tank; 71. Deaerator body; 72. Mixer; 73. Liquid receiving tray; 74. Steam distribution pipe; 75. Buffer cap; 76. Steam heating pipe; 100. Valve; 211. Liquid inlet; 212. Deliquid remover; 721. Drainage pipe; 722. Gradually convergent transition pipe; 723. Mixing chamber; 724. Diffuser; 751. Support column; 752. Conical umbrella; 2101. Exhaust port; 2102. Liquid discharge port; 2103. Balance port; 2111. Liquid inlet main pipe; 2112. Liquid inlet branch pipe; 7211. Inner pipe; 7212. Outer pipe. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application is clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work also fall within the scope of protection of the present application.

[0040] like Figure 1 As shown, the present application provides a boiler drain device, comprising a steam drum 1, a drain expansion device 2 and a heat pump 3 connected in series in sequence;

[0041] The heat pump 3 is also connected to the heat energy utilization device 4 and the raw water tank 5 respectively;

[0042] The drain expansion device 2 is also connected to the steam superheater 6 and the deaerator 7 respectively, and the deaerator 7 is also connected to the water supply tank 8.

[0043] When the device of the present application is in use, the discharged sewage in the boiler drum 1 (the sewage here refers to boiler water with an electrical conductivity higher than the specified value, rather than sewage in the traditional sense) enters the hydrophobic expansion device 2 for expansion. Since this water is pressurized high-temperature water (above 200°C), when entering the hydrophobic expansion device 2, due to the large internal space of the hydrophobic expansion device 2, the high-temperature water flows in and its flow cross-section increases, and this high-temperature water will boil again inside the hydrophobic expansion device 2. Part of the water is converted into steam and flows upward, and then is output after steam-water separation through the corresponding device. The remaining part of the water takes away a lot of heat due to the evaporation of steam, and its temperature is reduced (temperature 100-160°C), and is discharged from the bottom of the hydrophobic expansion device 2 into the heat pump 3 to utilize its heat.

[0044] The heat in these hot waters is utilized in the heat pump 3 to output energy with a higher calorific value, which is supplied to the heat energy utilization device 4 (in this application, for example, a small generator set or other device utilizing heat energy). The hot water after energy recovery by the heat pump 3 (at this time, its temperature is 50-60°C) is output from the heat pump 3 and transferred to the raw water tank 5 to be combined with raw water (referring to boiler water that has not been desalted and softened, and its conductivity is generally greater than 700μS / cm; the conductivity of sewage in the buffer water tank 22 is 20-40μS / cm), thereby reducing the conductivity of the raw water and thus reducing the operating burden of subsequent water treatment equipment.

[0045] Part of the steam discharged from the drain expansion device 2 is returned to the steam superheater 6 to be heated again and used for power generation by the steam turbine in the factory, and the other part is input to the deaerator 7 to heat and deoxygenate the desalinated and softened water from the water supply tank 8.

[0046] The device of the present application recycles the heat in the expanded sewage by setting a heat pump 3, and at the same time, the hot water after the heat pump 3 recovers the energy is input into the raw water tank 5 for recycling. In addition, the steam generated after the expansion is used in the deaerator 7 to deoxygenate the boiler water. The device of the present application recycles the energy in the steam and hot water after the boiler drainage expansion through the coordinated use of the above-mentioned equipment, overcoming the disadvantage of the traditional practice of failing to fully utilize the heat of the hot water after the expansion, resulting in energy waste. In addition, the raw water tank 5 in the present application can also recycle hot water, which has the advantage of saving water resources.

[0047] like Figure 2 As shown, optionally, the hydrophobic expansion device 2 includes an expansion tank 21 and a buffer water tank 22;

[0048] The expansion tank 21 has a steam exhaust port 2101 at the top, a liquid exhaust port 2102 at the bottom, a balance port 2103 at one side wall of the upper part of the expansion tank 21, a liquid inlet 211 installed on the expansion tank 21, and a liquid remover 212 installed at the top of the expansion tank 21;

[0049] The steam exhaust port 2101 is connected to the steam superheater 6 and the deaerator 7;

[0050] The drain port 2102 and the balance port 2103 are in communication with the buffer water tank 22;

[0051] The liquid inlet 211 is connected to the steam drum 1.

[0052] In the present application, the expansion tank 21 is used to expand the hot water discharged from the steam drum 1 to generate secondary steam and expansion water.

[0053] In use, the sewage discharged from the drum 1 first enters the expansion tank 21 from the liquid inlet 211. Since this water is pressurized high-temperature water (above 200°C), when entering the expansion tank 21, due to the large internal space of the expansion tank 21, the high-temperature water flows into the expansion tank 21. The cross-section of its flow increases, and this high-temperature water will boil again inside the expansion tank 21. A part of the water is converted into steam and flows upward. When passing through the deliquidator 212 (for example, a corrugated plate separator in this application), the droplets entrained in the steam are intercepted to improve the dryness of the output steam. The steam after steam-water separation is discharged from the exhaust port 2101 at the top of the expansion tank 21. The remaining part of the water takes away a lot of heat due to the evaporation of the steam, and its temperature is reduced (temperature 100-160°C), and enters the buffer water tank 22 from the bottom of the expansion tank 21.

[0054] like Figure 3 As shown, optionally, the liquid inlet 211 includes an annular liquid inlet main pipe 2111 disposed outside the expansion vessel 21;

[0055] The liquid inlet main pipe 2111 is connected to a plurality of liquid inlet branch pipes 2112 passing through the side wall of the expansion vessel 21 through a plurality of valves 100;

[0056] The portion of the liquid inlet branch pipe 2112 extending into the expansion container 21 is an outwardly expanding trumpet-shaped structure.

[0057] In the present application, the high-temperature and high-pressure water output from the steam drum 1 is discharged into the expansion tank 21 through a plurality of parallel liquid inlet branches 2112, which can disperse the pressure generated when the high-temperature and high-pressure water is expanded and reduce the vibration of the expansion tank 21 caused by the expansion. In addition, a plurality of valves 100 and a plurality of liquid inlet branches 2112 are arranged in a one-to-one correspondence, and independent control of the liquid discharge and expansion of each liquid inlet branch 2112 can be achieved, thereby better controlling the expansion process.

[0058] like Figure 4 As shown, optionally, the deaerator 7 includes a deaerator body 71;

[0059] A plurality of downward spraying mixers 72 are installed inside the deaerator body 71, and the mixers 72 are respectively connected to the hydrophobic expansion device 2 and the water supply tank 8;

[0060] A liquid receiving pan 73 is horizontally arranged in the deaerator body 71, and a plurality of liquid distribution holes are opened at the bottom of the liquid receiving pan 73. The liquid receiving pan 73 is located below the mixer 72;

[0061] A steam distribution pipe 74 is provided at the bottom of the deaerator body 71 , and the steam distribution pipe 74 is connected to the hydrophobic expansion device 2 .

[0062] In the present application, the liquid receiving pan 73 is arranged along the length direction of the deaerator body 71, and the liquid receiving pan 73 can be fixed in the deaerator body 71 through corresponding connecting parts. The fixing method can be to hang and fix the liquid receiving pan 73 through a connecting rod, or to support and fix it with a support rod, or to hang and fix it through a chain.

[0063] When in use, part of the steam output from the hydrophobic expansion device 2 is mixed with the desalinated soft water supplied by the water supply tank 8 in the mixer 72, the desalinated soft water is heated, and the steam output from the mixer 72 is sprayed on the liquid receiving pan 73, and the upward steam (these steam comes from the steam distribution pipe 74) passes through the liquid distribution holes on the liquid receiving pan 73 to exchange heat with the water in the liquid receiving pan 73 by convection, and the soft water on the liquid receiving pan 73 is further heated. The water falling from the liquid receiving pan 73 (part of it falls through the liquid distribution holes, and the other part falls from the surrounding of the liquid receiving pan 73 by overflow) is then gathered at the bottom of the deaerator 7, and at the same time, part of the steam discharged from the exhaust port 2101 enters the steam distribution pipe 74 and then sprays out, and the sprayed steam overflows upward from the bottom of the soft water accumulated in the deaerator 7, further heating and stirring the soft water, and taking away the oxygen in the water. The oxygen in the soft water treated by the above equipment will be output from the corresponding opening at the top of the deaerator 7 with the steam for treatment, such as cooling and discharge. The deoxygenated soft water is output from the drain outlet at the bottom of the deaerator 7 to be supplied to the boiler.

[0064] like Figure 4 and Figure 5 As shown, optionally, a plurality of buffer caps 75 are provided on the upper surface of the liquid receiving tray 73, and the plurality of buffer caps 75 correspond to the positions of the plurality of mixers 72 one by one;

[0065] The buffer cap 75 includes a support column 751 and a conical umbrella surface 752 connected to the top of the support column 751 .

[0066] In the present application, when in use, the heated soft water sprayed from the mixer 72 impacts the buffer cap 75, and is dispersed and falls onto the liquid receiving pan 73 through the conical umbrella surface 752 to reduce the impact of the hot water on the liquid receiving pan 73. The cone angle of the conical umbrella surface 752 is 90 to 150 degrees.

[0067] like Figure 6 As shown, optionally, the mixer 72 includes a guide pipe 721, a gradually contracting transition pipe 722, a mixing chamber 723 and a diffuser pipe 724 which are connected in sequence;

[0068] The drainage tube 721 includes an inner tube 7211 and an outer tube 7212 which are coaxially arranged;

[0069] One end of the outer tube 7212 is closed and the other end is connected to the tapered transition tube 722. The inner tube 7211 passes through the closed end of the outer tube 7212 and extends into the outer tube 7212. The output port of the inner tube 7211 is close to the tapered transition tube 722.

[0070] The inner tube 7211 is connected to the hydrophobic expansion device 2 , and an opening is provided on one side of the outer tube 7212 and is connected to the water supply tank 8 .

[0071] In the present application, a part of the steam entering the deaerator 7 during use enters the inner tube 7211 of the drainage pipe 721, and after passing through the tapered transition pipe 722 with the soft water supplied in the outer tube 7212, enters the mixing chamber 723 to mix and heat the soft water, and then sprays out from the diffusion pipe 724. Since the steam carries pressure, its flow rate is relatively high. Therefore, when in use, the high-speed flowing steam will form a negative pressure at the drainage pipe 721, and the desalinated soft water in the water supply tank 8 can be sucked. The setting of the tapered transition pipe 722 can increase the pressure of the fluid by the gradual contraction of the pipeline, which is convenient for mass transfer and heat transfer between the steam and the desalinated soft water in the mixing chamber.

[0072] like Figure 4 As shown, optionally, a plurality of steam heating pipes 76 are horizontally arranged at the lower part of the liquid receiving pan 73;

[0073] One end of the steam heating pipe 76 is closed, and the other end is connected to the hydrophobic expansion device 2. A plurality of exhaust holes are provided on the side of the steam heating pipe 76.

[0074] When in use, the water falling from the liquid receiving pan 73 is distributed as a liquid film on the periphery of the steam heating pipe 76, and at the same time contacts the steam discharged through the exhaust holes on the steam heating pipe 76 for heat exchange again. The steam after heat exchange goes up, and the soft water after heat exchange falls to the bottom of the deaerator 7 and gathers, and is heated again through the steam distribution pipe 74.

[0075] A boiler drain device, the use process of which is as follows:

[0076] When in use, the discharged sewage in the boiler drum 1 (here sewage refers to boiler water with a conductivity higher than the specified value, not sewage in the traditional sense) enters the hydrophobic expansion device 2 for expansion. The sewage discharged from the drum 1 is first distributed to the liquid inlet branch 2112 from the liquid inlet main pipe 2111 of the liquid inlet 211 through the valve 100. Since this water is pressurized high-temperature water (above 200°C), when it enters the expansion tank 21 through the liquid inlet branch 2112, due to the large internal space of the expansion tank 21, the cross-section through which the high-temperature water flows increases when it flows into the expansion tank 21, and this high-temperature water will boil again inside the expansion tank 21. A part of the water is converted into steam and ascends. When passing through the deliquidator 212 (for example, a corrugated plate separator in this application), the droplets entrained in the steam are intercepted to improve the dryness of the output steam. The steam after steam-water separation is discharged from the exhaust port 2101 at the top of the expansion tank 21. The remaining water takes away a lot of heat due to the evaporation of steam, and its temperature drops (temperature 100-160° C.), and enters the buffer water tank 22 from the bottom of the expansion tank 21.

[0077] The water entering the buffer water tank 22 is input into the heat pump 3 to utilize the heat therein, output energy with a higher calorific value, and supply it to the heat energy utilization device 4 (in this application, for example, a small generator set or other device utilizing heat energy). The hot water (at this time, its temperature is 50-60°C) after energy recovery by the heat pump 3 is output from the heat pump 3 and transferred to the raw water tank 5 to be combined with raw water (referring to boiler water that has not been desalted and softened, and its conductivity is generally greater than 700μS / cm; the conductivity of the sewage in the buffer water tank 22 is 20-40μS / cm), thereby reducing the conductivity of the raw water and thus reducing the operating burden of subsequent water treatment equipment.

[0078] A portion of the steam exhausted from the exhaust port 2101 is fed back to the steam superheater 6 to be heated again and used for power generation by the steam turbine in the factory, and the other portion is fed to the deaerator 7 to heat and deoxygenate the desalted and softened water.

[0079] A part of the steam entering the deaerator 7 enters the inner tube 7211 of the drainage pipe 721, and after passing through the tapered transition pipe 722 with the soft water supplied from the outer tube 7212, enters the mixing chamber 723 to mix and heat the soft water, and then sprays out from the diffusion pipe 724. The heated soft water sprayed out from the diffusion pipe 724 hits the buffer cap 75, and is dispersed and falls on the liquid receiving pan 73 through the conical umbrella surface 752. The upward steam (these steam comes from the steam air distribution pipe 74 and the steam heating pipe 76) passes through the liquid distribution holes on the liquid receiving pan 73 to exchange heat with the water in the liquid receiving pan 73, and further heats the soft water on the liquid receiving pan 73. The water falling from the liquid receiving pan 73 (part of it falls through the liquid distribution holes, and the other part falls from the surroundings of the liquid receiving pan 73 by overflow). The soft water falling on the steam heating pipe 76 is distributed as a liquid film on the periphery of the steam heating pipe 76, and at the same time, it contacts the steam discharged through the exhaust hole on the steam heating pipe 76 again for heat exchange. The steam after heat exchange goes up, and the soft water after heat exchange falls to the bottom of the deaerator 7 and gathers. At the same time, part of the steam discharged from the exhaust port 2101 enters the steam distribution pipe 74 and then sprays out. The sprayed steam overflows upward from the bottom of the soft water accumulated in the deaerator 7, further heating and stirring the soft water, and taking away the oxygen in the water. The oxygen in the soft water treated by the above structure will be output from the corresponding opening at the top of the deaerator 7 with the steam for processing, such as cooling and discharge. The deoxygenated soft water is output from the drain port at the bottom of the deaerator 7 for supply to the boiler.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A boiler drain device, characterized in that: It comprises a steam drum (1), a water-draining expansion device (2) and a heat pump (3) which are sequentially connected in series; The heat pump (3) is also connected to the heat energy utilization device (4) and the raw water tank (5) respectively; The drain expansion device (2) is also connected to the steam superheater (6) and the deaerator (7) respectively, and the deaerator (7) is also connected to the water supply tank (8).

2. The boiler drain device according to claim 1, characterized in that: The hydrophobic expansion device (2) comprises an expansion tank (21) and a buffer water tank (22); The expansion tank (21) is provided with a steam exhaust port (2101) at the top and a liquid exhaust port (2102) at the bottom. A balance port (2103) is also provided on one side wall of the upper part of the expansion tank (21). A liquid inlet (211) is also installed on the expansion tank (21). A liquid remover (212) is also installed on the top of the expansion tank (21); The steam exhaust port (2101) is connected to the steam superheater (6) and the deaerator (7); The liquid discharge port (2102) and the balance port (2103) are in communication with the buffer water tank (22); The liquid inlet (211) is connected to the steam drum (1).

3. The boiler drain device according to claim 2, characterized in that: The liquid inlet (211) comprises an annular liquid inlet main pipe (2111) arranged outside the expansion vessel (21); The liquid inlet main pipe (2111) is connected to a plurality of liquid inlet branch pipes (2112) passing through the side wall of the expansion vessel (21) via a plurality of valves (100); The portion of the liquid inlet branch pipe (2112) extending into the expansion container (21) is an outwardly expanding trumpet-shaped structure.

4. The boiler drain device according to any one of claims 1 to 3, characterized in that: The deaerator (7) comprises a deaerator body (71); A plurality of downward spraying mixers (72) are installed inside the deaerator body (71), and the mixers (72) are respectively connected to the hydrophobic expansion device (2) and the water supply tank (8); A liquid receiving pan (73) is horizontally arranged in the deaerator body (71), a plurality of liquid distribution holes are opened at the bottom of the liquid receiving pan (73), and the liquid receiving pan (73) is located below the mixer (72); A steam distribution pipe (74) is provided at the bottom of the deaerator body (71), and the steam distribution pipe (74) is connected to the hydrophobic expansion device (2).

5. The boiler drain device according to claim 4, characterized in that: A plurality of buffer caps (75) are arranged on the upper surface of the liquid receiving plate (73), and the plurality of buffer caps (75) correspond to the positions of the plurality of mixers (72) one by one; The buffer cap (75) comprises a support column (751) and a conical umbrella surface (752) connected to the top of the support column (751).

6. The boiler drain device according to claim 4, characterized in that: The mixer (72) comprises a drainage pipe (721), a gradually contracting transition pipe (722), a mixing chamber (723) and a diffusion pipe (724) which are connected in sequence; The drainage tube (721) comprises an inner tube (7211) and an outer tube (7212) which are coaxially arranged; One end of the outer tube (7212) is closed and the other end is connected to the tapered transition tube (722); the inner tube (7211) passes through the closed end of the outer tube (7212) and extends into the outer tube (7212); and the output port of the inner tube (7211) is close to the tapered transition tube (722); The inner tube (7211) is connected to the hydrophobic expansion device (2), and an opening is provided on one side of the outer tube (7212) and is connected to the water supply tank (8).

7. The boiler drain device according to claim 4, characterized in that: A plurality of steam heating pipes (76) are arranged horizontally at the lower part of the liquid receiving tray (73); One end of the steam heating pipe (76) is closed, and the other end is connected to the hydrophobic expansion device (2). A plurality of exhaust holes are provided on the side of the steam heating pipe (76).

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