Efficient cyclic utilization system for steam condensate water

Abstract

The invention provides a steam condensate efficient cyclic utilization system which comprises a negative pressure steam hair growing system, a steam condensate efficient cyclic utilization system, a steam condensate efficient cyclic utilization system, a steam condensate efficient cyclic utilization system, a steam condensate efficient cyclic utilization system and a steam condensate efficient cyclic utilization system, and the negative pressure steam hair growing system is used for exchanging heat with a heat demand end through negative pressure steam; the biomass boiler heat production system comprises a combustion part for combustion heat supply and a steam pocket arranged at the top end of the combustion part; wherein the steam pocket is used for exchanging heat with the negative pressure steam hair growing system, so that negative pressure water in the negative pressure steam hair growing system can generate the negative pressure steam.

Description

Technical Field

[0001] The present invention relates to the technical field of energy utilization, and in particular to a steam condensate high-efficiency recycling system. Background Art

[0002] A biomass boiler is a boiler that uses biomass gas as a combustion medium. The biomass gas in the boiler generates a lot of heat after combustion. How to make full use of the heat generated by the biomass boiler to achieve energy conservation and emission reduction and efficient waste heat utilization has always been a technical problem that technicians in this field have been committed to solving. Summary of the invention

[0003] One of the problems solved by the present invention is to improve the waste heat utilization efficiency of a biomass boiler by providing a steam condensate high-efficiency recycling system.

[0004] In order to solve the above problems, the present invention provides a steam condensate water efficient recycling system, the steam condensate water efficient recycling system comprises: a negative pressure steam generation system, the negative pressure steam generation system is used to exchange heat with the heat demand end through negative pressure steam; a biomass boiler heat generation system, the biomass boiler heat generation system comprises a combustion part for combustion heat supply, and a steam bag arranged at the top of the combustion part; wherein, the steam bag is used to exchange heat with the negative pressure steam generation system, so that the negative pressure water in the negative pressure steam generation system generates negative pressure steam.

[0005] In any of the above technical solutions, the negative pressure steam generation system includes: a negative pressure water circulation pipeline; a water pump, which is arranged in the negative pressure water circulation pipeline and is used to drive the negative pressure water to circulate; a first heat exchange section, which is arranged in the negative pressure water circulation pipeline and is used to exchange heat with the steam bag so that the negative pressure water in the negative pressure water circulation pipeline is generated into negative pressure steam; a second heat exchange section, which is arranged in the negative pressure water circulation pipeline and is used to exchange heat between the negative pressure steam and the heat demand end.

[0006] In any of the above technical solutions, the negative pressure steam generating system also includes: a first flow regulating valve, which is arranged between the water pump and the second heat exchange section and is used to regulate the negative pressure water flow in the negative pressure water circulation pipeline.

[0007] In any of the above technical solutions, the negative pressure steam generating system also includes: a negative pressure vacuum pump, which is arranged between the first heat exchange section and the second heat exchange section and is used to adjust the air pressure in the negative pressure water circulation pipeline.

[0008] In any of the above technical solutions, the negative pressure steam generating system further includes: a pressure sensor, which is arranged in the negative pressure water circulation pipeline and is used to check the air pressure in the negative pressure water circulation pipeline.

[0009] In any of the above technical solutions, the biomass boiler heat generation system also includes: a water tank; a jacket, the jacket surrounding the combustion part; a jacket water inlet pipeline, the jacket water inlet pipeline connects the water tank and the jacket and is used to supply water to the jacket; a jacket water inlet valve, the jacket water inlet valve is arranged on the jacket water inlet pipeline; a jacket water inlet pump, the jacket water inlet pump is arranged between the water tank and the jacket water inlet valve; a jacket water outlet pipeline, the jacket water inlet pipeline connects the jacket and the negative pressure water circulation pipeline of the negative pressure steam generation system; a jacket water outlet valve, the jacket water outlet valve is arranged on the jacket water outlet pipeline.

[0010] In any of the above technical solutions, the biomass boiler heat generation system also includes: a flue gas exhaust pipeline, which is connected to the combustion part; an exhaust fan, which is arranged on the flue gas exhaust pipeline; a smoke gas exhaust valve, which is arranged in the smoke gas exhaust pipeline; a filter, which is arranged between the exhaust fan and the smoke gas exhaust valve; a hot air drying chamber, which is connected to the flue gas exhaust pipeline; wherein the exhaust fan is used to drive the hot flue gas from the combustion part to flow to the hot air drying chamber.

[0011] In any of the above technical solutions, the biomass boiler heat generation system also includes: a biomass fuel delivery pipeline, which is connected to the combustion part; and a biomass fuel delivery valve, which is arranged in the biomass fuel delivery pipeline.

[0012] In any of the above technical solutions, the steam condensate water efficient recycling system also includes: a refrigerant circulation system, which is used to exchange heat with the negative pressure steam generation system so that the negative pressure water in the negative pressure steam generation system is heated.

[0013] In any of the above technical solutions, the refrigerant circulation system includes: an evaporator; a condenser; a compressor, which is arranged between the inlet of the evaporator and the outlet of the condenser; a throttle valve, which is arranged between the outlet of the evaporator and the inlet of the condenser; and a refrigerant circulation pipeline, which connects the evaporator, the throttle valve, the condenser and the compressor so that the refrigerant circulates among the evaporator, the throttle valve, the condenser and the compressor.

[0014] Beneficial Effects

[0015] The present invention provides a steam condensate efficient recycling system, which includes: a negative pressure steam generation system and a biomass boiler heat generation system. The negative pressure steam generation system is used to exchange heat with a heat demand end through negative pressure steam. The biomass boiler heat generation system includes a combustion part for combustion and heat supply, and a steam bag arranged at the top of the combustion part. Among them, since the steam bag exchanges heat with the negative pressure steam generation system, the negative pressure water in the negative pressure steam generation system can be heated and heated to emit negative pressure steam. In the factory environment, negative pressure steam has a variety of application scenarios, and the energy utilization efficiency of negative pressure steam is high and it is green and environmentally friendly. In particular, in the papermaking process, hot steam is an indispensable energy source in multiple key processes, mainly used to provide thermal energy, promote chemical reactions or accelerate the drying process. Therefore, in the process of heat generation by the biomass boiler heat generation system, the negative pressure steam generation system is used to recover and utilize the waste heat, so that the negative pressure water in the negative pressure steam generation system can be heated and heated to emit negative pressure steam, which can be applied to various processes in the factory environment, thereby improving energy utilization efficiency and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is one of the schematic diagrams of the structure of the steam condensate efficient recycling system provided by the present invention.

[0017] Figure 2 This is one of the schematic diagrams of the structure of the steam condensate efficient recycling system provided by the present invention.

[0018] Reference numerals

[0019] Negative pressure steam generation system: 100; Negative pressure water circulation pipeline: 110; Water pump: 120; First heat exchange section: 130; Second heat exchange section: 140; First flow control valve: 150; Negative pressure vacuum pump: 160; Pressure sensor: 170; Heat demand end: 200; Biomass boiler heat generation system: 300; Combustion section: 310; Steam drum: 320; Steam tank: 321; Water tank: 330; Jacket: 340; Jacket water inlet pipeline: 331; Jacket water inlet valve: 332; Jacket water inlet pump: 333; Jacket water outlet pipeline: 350; Jacket water outlet valve: 351; Smoke exhaust pipeline: 360; Exhaust fan: 361; Smoke exhaust valve: 362; Filter: 363; Hot air drying chamber: 364; Biomass fuel delivery pipeline: 370; Biomass fuel delivery valve: 371; Refrigerant circulation system: 400; Evaporator: 410; Condenser: 420; Compressor: 430; Throttle valve: 440; Refrigerant circulation pipeline: 450; DETAILED DESCRIPTION

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the following is a detailed description of the specific embodiments of the present invention.

[0021] like Figure 1 As shown, the present invention provides a steam condensate efficient recycling system, the steam condensate efficient recycling system comprising: a negative pressure steam generating system 100, the negative pressure steam generating system 100 is used to exchange heat with a heat demand end 200 through negative pressure steam; a biomass boiler heat generating system 300, the biomass boiler heat generating system 300 comprises a combustion section 310 for combustion heat supply, and a steam bag 320 arranged at the top of the combustion section 310; wherein the steam bag 320 is used to exchange heat with the negative pressure steam generating system 100, so that the negative pressure water in the negative pressure steam generating system 100 generates the negative pressure steam.

[0022] With the increasing attention paid to renewable energy and the promotion of environmental protection policies around the world, the development prospects of biomass energy boilers are broad. The biomass boiler heat generation system 300 of the present invention is a boiler device that uses biomass energy (such as wood, crop residues, organic waste, etc.) as fuel. The working principle of the biomass boiler heat generation system 300 of the present invention is to transfer the heat energy generated after the combustion of biomass fuel to water, so that it is heated into steam or hot water, thereby achieving the purposes of heating, power generation, etc. The biomass boiler heat generation system 300 of the present invention is mainly composed of several parts such as a feeding system, a combustion system, a heat exchange system and an exhaust system. Among them, the combustion part 310 is used as a combustion system. During the working process, the biomass fuel is fully burned in the combustion part 310, releasing a large amount of heat energy, which is transferred to water through the heat exchange system of the boiler, so that it is heated into hot water, and then supplied to users. The biomass boiler heat generation system 300 of the present invention can be a fixed bed boiler, a fluidized bed boiler, a vibrating grate boiler or a high-temperature gasification boiler.

[0023] The steam drum 320 is an important component in the boiler equipment. The main function of the steam drum 320 is to store the steam generated by the boiler and to buffer and regulate the steam flow between the boiler and the steam turbine. At the same time, the steam drum can also perform preliminary purification of the steam, remove impurities and moisture therein, and ensure the quality of the steam. The steam drum 320 of the present invention is composed of components such as a cylinder, a head, a pipe seat, a manhole, and a hand hole. The cylinder is the main part of the steam drum and is used to store steam; the head is used to close the two ends of the cylinder; the pipe seat is used to connect various pipes, such as water supply pipes, steam pipes, etc.; the manhole and the hand hole are convenient for the staff to inspect and maintain the steam drum. During the operation of the boiler, the heat generated by the combustion of the fuel is transferred to the water in the boiler, which heats it and vaporizes it into steam. The steam is gathered and stored in the steam drum 320. When the pressure and temperature of the steam reach certain requirements, the steam drum 320 will transport the steam to the steam tank 321 through a pipeline for use by related equipment.

[0024] The negative pressure steam generation system 100 is used to generate steam. Negative pressure steam refers to steam generated when water is under negative pressure. The temperature required for water to be converted into steam under negative pressure conditions is lower, which is more energy-efficient and helps to improve heat utilization efficiency. In addition, in a paper mill environment, the temperature of steam required for various processes does not need to exceed 100°C. Generally, it is sufficient to be above 80°C. Therefore, negative pressure steam has many application scenarios in a paper mill environment.

[0025] In the papermaking process, hot steam is an indispensable energy source in many key processes, mainly used to provide heat energy, promote chemical reactions or accelerate the drying process. For example, in the kraft or sulfite pulping process, wood chips and chemical solutions are cooked at high temperature and high pressure in a cooking pot to separate fibers and lignin. The application of steam helps to heat the cooking pot (usually at a temperature of 150-180°C) and provide the heat and pressure required for the reaction. Before mechanical pulping, wood chips may be preheated by steam to soften the fibers and reduce the energy consumption of pulping. When pulping or adding chemicals (such as sizing agents, fillers), hot steam can be used to heat the pulp, improve processing efficiency or promote uniform dispersion of chemicals. When starch is added as a reinforcing agent, steam heating is also required to gelatinize it and enhance the strength of the paper. When wet paper sheets are formed, steam can be used to heat the mesh or felt to reduce adhesion and accelerate dehydration. In addition, in some process designs, steam can be used to heat the surface of the press roll to prevent wet paper sheets from sticking and improve dehydration efficiency. The wet paper passes through multiple sets of steam-heated drying cylinders (temperature is about 80-120℃), and the remaining water is evaporated by heat conduction. Some high-speed paper machines require the use of hot air hoods, which heat the air and blow it onto the paper surface to accelerate drying. If the paper needs to be coated (such as coated paper), the coating material needs to cure quickly. Steam-heated drying cylinders or hot air systems can be used to evaporate water or solvents in the coating. Some models of calenders use steam to heat the roller surface to improve the smoothness and gloss of the paper.

[0026] In summary, the heated negative pressure steam can exchange heat with the heat demand end 200 to improve the energy utilization efficiency of the biomass boiler heat generation system 300.

[0027] like Figure 2 As shown, the negative pressure steam generating system 100 includes: a negative pressure water circulation pipeline 110; a water pump 120, wherein the water pump 120 is arranged in the negative pressure water circulation pipeline 110, and is used to drive the negative pressure water to circulate; a first heat exchange section 130, wherein the first heat exchange section 130 is arranged in the negative pressure water circulation pipeline 110, and is used to exchange heat with the steam bag 320, so that the negative pressure water in the negative pressure water circulation pipeline 110 is generated into negative pressure steam; a second heat exchange section 140, wherein the second heat exchange section 140 is arranged in the negative pressure water circulation pipeline 110, and is used to exchange heat between the negative pressure steam and the heat demand end 200.

[0028] The negative pressure water can circulate in the negative pressure water circulation pipeline 110 under the driving action of the water pump 120. When flowing through the first heat exchange section 130, the negative pressure water absorbs heat from the steam drum 320 to form negative pressure steam, and the negative pressure steam enters the second heat exchange section 140 to exchange heat with the heat demand end 200. Among them, the negative pressure steam can exchange heat with the heat demand end 200 by directly outputting it at the heat demand end 200.

[0029] The negative pressure steam generating system 100 further includes: a first flow regulating valve 150 , which is disposed between the water pump 120 and the second heat exchange section 140 and is used to regulate the negative pressure water flow in the negative pressure water circulation pipeline 110 .

[0030] By providing the first flow regulating valve 150 , the negative pressure water flow in the negative pressure water circulation pipeline 110 can be regulated, so that negative pressure steam can be supplied according to the actual needs of the heat demand end 200 .

[0031] The negative pressure steam generating system 100 further includes: a negative pressure vacuum pump 160 , which is disposed between the first heat exchange section 130 and the second heat exchange section 140 and is used to adjust the air pressure in the negative pressure water circulation pipeline 110 .

[0032] The negative pressure vacuum pump 160 is used to create a negative pressure environment in the negative pressure water circulation pipeline 110 and adjust the size of the negative pressure. In actual use, the negative pressure vacuum pump 160 is first turned on to adjust the environment in the negative pressure water circulation pipeline 110, and then water is supplied to the negative pressure water circulation pipeline 110.

[0033] The negative pressure steam generating system 100 further includes a pressure sensor 170 , which is disposed in the negative pressure water circulation pipeline 110 and is used to check the air pressure in the negative pressure water circulation pipeline 110 .

[0034] The pressure sensor can detect the air pressure in the negative pressure water circulation pipeline 110 in real time to achieve the functions of safety monitoring and early warning.

[0035] like Figure 2As shown, the biomass boiler heat generation system 300 also includes: a water tank 330; a jacket 340, the jacket 340 surrounding the combustion part 310; a jacket water inlet pipeline 331, the jacket water inlet pipeline 331 connects the water tank 330 and the jacket 340, and is used to supply water to the jacket 330; a jacket water inlet valve 332, the jacket water inlet valve 332 is arranged on the jacket water inlet pipeline 331; a jacket water inlet pump 333, the jacket water inlet pump 333 is arranged between the water tank 330 and the jacket water inlet valve 332; a jacket water outlet pipeline 350, the jacket water inlet pipeline 350 connects the jacket 340 and the negative pressure water circulation pipeline 110 of the negative pressure steam generation system 100; a jacket water outlet valve 351, the jacket water outlet valve 351 is arranged on the jacket water outlet pipeline 350.

[0036] The water tank 330 is used to store water, and the water tank 330 is connected to the jacket 340 through the jacket water inlet pipe 331. The jacket water inlet valve 332 can control the opening and closing of the jacket water inlet pipe 331. The jacket 340 is an important component of the boiler structure. The jacket 340 can recycle the waste heat generated in the industrial production process, converting the waste heat into steam or hot water for other production links or heating purposes, thereby improving energy utilization efficiency. In the high-temperature and high-pressure industrial production environment, the boiler and its related equipment are subjected to huge thermal and mechanical stress. The jacket 340 can provide an additional layer of protection for the boiler, reduce the direct impact of heat on the boiler body, reduce the risk of equipment damage, and improve the safety of operation. The jacket 340 can reduce the thermal stress of the boiler body, thereby slowing down the aging and wear rate of the equipment, extending the service life of the equipment, and reducing the frequency of maintenance and replacement of equipment.

[0037] In order to improve the energy utilization rate of the jacket 340, the present invention is provided with a jacket water outlet pipeline 350, and the jacket water inlet pipeline 350 connects the jacket 340 with the negative pressure water circulation pipeline 110 of the negative pressure steam generating system 100. The jacket water outlet valve 351 is provided on the jacket water outlet pipeline 350 to control the opening and closing of the jacket water inlet pipeline 350.

[0038] By connecting the jacket 340 and the negative pressure water circulation pipeline 110 of the negative pressure steam generating system 100, the waste heat of the jacket 340 can be recycled, which not only improves the energy utilization efficiency, but also reduces energy waste and greenhouse gas emissions, and is conducive to achieving a more environmentally friendly and sustainable production method.

[0039] The biomass boiler heat generation system 300 also includes: a smoke exhaust pipeline 360, which is connected to the combustion section 310; an exhaust fan 361, which is arranged on the smoke exhaust pipeline 360; a smoke exhaust valve 362, which is arranged in the smoke exhaust pipeline 360; a filter 363, which is arranged between the exhaust fan 361 and the smoke exhaust valve 362; a hot air drying chamber 364, which is connected to the smoke exhaust pipeline 360; wherein the exhaust fan 361 is used to drive the hot smoke from the combustion section 310 to flow to the hot air drying chamber 364.

[0040] The above structure can discharge the smoke from the biomass boiler heat generation system 300. The smoke filtered by the filter 363 can be used in a factory environment for example, in a drying process.

[0041] The biomass boiler heat generation system 300 further includes: a biomass fuel delivery pipeline 370 , which is in communication with the combustion unit 310 ; and a biomass fuel delivery valve 371 , which is disposed in the biomass fuel delivery pipeline 370 .

[0042] The harmful gases such as carbon dioxide, nitrogen dioxide, and sulfur dioxide emitted by the biomass boiler heat generation system 300 after combustion are far lower than those emitted by highly polluting fuels such as coal and oil, which is beneficial to environmental protection. Biomass fuel is a renewable energy source with a wide range of sources, including agricultural waste, forestry waste, urban garbage, etc., and has the characteristics of sustainable utilization. The price of biomass fuel is relatively low, and by-products such as ash produced during the combustion process can also be used as fertilizer or building materials, which improves the comprehensive utilization rate of resources. In the papermaking industry, thermal energy is indispensable from the cooking and pulping of raw materials to the drying of paper. Biomass boilers provide sufficient thermal energy for paper mills with their high thermal conversion efficiency.

[0043] The steam condensate high-efficiency recycling system further includes: a refrigerant circulation system 400, wherein the refrigerant circulation system 400 is used to perform heat exchange with the negative pressure steam generating system 100 so that the negative pressure water in the negative pressure steam generating system 100 is heated.

[0044] Specifically, the refrigerant circulation system 400 includes: an evaporator 410; a condenser 420; a compressor 430, wherein the compressor 430 is arranged between the inlet of the evaporator 410 and the outlet of the condenser 420; a throttle valve 440, wherein the throttle valve 440 is arranged between the outlet of the evaporator 410 and the inlet of the condenser 420; and a refrigerant circulation pipeline 450, wherein the refrigerant circulation pipeline 450 connects the evaporator 410, the throttle valve 440, the condenser 420 and the compressor 430 so that the refrigerant circulates among the evaporator 410, the throttle valve 440, the condenser 420 and the compressor 430.

[0045] Through the above structure, the negative pressure water circulation pipeline 110 can absorb the heat of the condenser 420, so that the negative pressure water is preheated before entering the first heat exchange section 130, thereby achieving the purpose of improving the energy utilization efficiency of the refrigerant circulation system 400.

[0046] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A steam condensate efficient recycling system, characterized in that: The steam condensate water efficient recycling system comprises: A negative pressure steam generating system (100), wherein the negative pressure steam generating system (100) is used to perform heat exchange with a heat demand end (200) via negative pressure steam; A biomass boiler heat generation system (300), the biomass boiler heat generation system (300) comprising a combustion part (310) for combustion and heat supply, and a steam drum (320) arranged at the top of the combustion part (310); The steam bag (320) is used to exchange heat with the negative pressure steam generating system (100), so that the negative pressure water in the negative pressure steam generating system (100) generates the negative pressure steam.

2. The steam condensate efficient recycling system according to claim 1, characterized in that: The negative pressure steam generating system (100) comprises: Negative pressure water circulation pipeline (110); A water pump (120), the water pump (120) being arranged in the negative pressure water circulation pipeline (110) and being used to drive the negative pressure water to circulate; a first heat exchange section (130), the first heat exchange section (130) being arranged in the negative pressure water circulation pipeline (110) and being used to perform heat exchange with the steam drum (320) so that the negative pressure water in the negative pressure water circulation pipeline (110) is generated into negative pressure steam; A second heat exchange section (140), wherein the second heat exchange section (140) is disposed in the negative pressure water circulation pipeline (110) and is used to perform heat exchange between the negative pressure steam and the heat demand end (200).

3. The steam condensate efficient recycling system according to claim 2 is characterized in that: The negative pressure steam generating system (100) further comprises: A first flow regulating valve (150), wherein the first flow regulating valve (150) is disposed between the water pump (120) and the second heat exchange section (140), and is used to regulate the negative pressure water flow in the negative pressure water circulation pipeline (110).

4. The steam condensate efficient recycling system according to claim 2, characterized in that: The negative pressure steam hair-generating system (100) further comprises: A negative pressure vacuum pump (160), wherein the negative pressure vacuum pump (160) is disposed between the first heat exchange section (130) and the second heat exchange section (140), and is used to adjust the air pressure in the negative pressure water circulation pipeline (110).

5. The steam condensate efficient recycling system according to claim 4 is characterized in that: The negative pressure steam generating system (100) further comprises: A pressure sensor (170), wherein the pressure sensor (170) is disposed in the negative pressure water circulation pipeline (110) and is used to check the air pressure in the negative pressure water circulation pipeline (110).

6. The steam condensate efficient recycling system according to any one of claims 1 to 5, characterized in that: The biomass boiler heat generation system (300) further includes: Water tank (330); a jacket (340), the jacket (340) surrounding the combustion part (310); a jacket water inlet pipeline (331), the jacket water inlet pipeline (331) connecting the water tank (330) and the jacket (340) and used to supply water to the jacket (330); A jacket water inlet valve (332), wherein the jacket water inlet valve (332) is arranged on the jacket water inlet pipeline (331); A jacket water inlet pump (333), wherein the jacket water inlet pump (333) is disposed between the water tank (330) and the jacket water inlet valve (332); A jacket water outlet pipeline (350), wherein the jacket water inlet pipeline (350) connects the jacket (340) and the negative pressure water circulation pipeline (110) of the negative pressure steam generating system (100); A jacket water outlet valve (351), wherein the jacket water outlet valve (351) is arranged on the jacket water outlet pipeline (350).

7. The steam condensate efficient recycling system according to any one of claims 1 to 5, characterized in that: The biomass boiler heat generation system (300) further includes: a smoke exhaust pipeline (360), the smoke exhaust pipeline (360) being in communication with the combustion part (310); an exhaust fan (361), the exhaust fan (361) being arranged on the smoke exhaust pipeline (360); a smoke exhaust valve (362), the smoke exhaust valve (362) being arranged in the smoke exhaust pipeline (360); a filter (363), the filter (363) being arranged between the exhaust fan (361) and the smoke exhaust valve (362); A hot air drying chamber (364), wherein the exhaust fan (364) is in communication with the smoke exhaust pipeline (360); Wherein, the exhaust fan (361) is used to drive the hot flue gas from the combustion part (310) to flow toward the hot air drying chamber (364).

8. The steam condensate efficient recycling system according to any one of claims 1 to 5, characterized in that: The biomass boiler heat generation system (300) further includes: A biomass fuel delivery pipeline (370), the biomass fuel delivery pipeline (370) being in communication with the combustion unit (310); A biomass fuel delivery valve (371), wherein the biomass fuel delivery valve (371) is arranged in the biomass fuel delivery pipeline (370).

9. The steam condensate efficient recycling system according to any one of claims 1 to 5, characterized in that: The steam condensate water efficient recycling system also includes: A refrigerant circulation system (400) is used to perform heat exchange with the negative-pressure steam generating system (100) so that the negative-pressure water in the negative-pressure steam generating system (100) is heated.

10. The steam condensate efficient recycling system according to claim 9, characterized in that: The refrigerant circulation system (400) comprises: Evaporator (410); Condenser (420); a compressor (430), the compressor (430) being disposed between an inlet of the evaporator (410) and an outlet of the condenser (420); a throttle valve (440), the throttle valve (440) being disposed between an outlet of the evaporator (410) and an inlet of the condenser (420); A refrigerant circulation pipeline (450) connects the evaporator (410), the throttle valve (440), the condenser (420) and the compressor (430) so that the refrigerant circulates among the evaporator (410), the throttle valve (440), the condenser (420) and the compressor (430).

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