Biomass peak steam supply system based on saline water double-medium heat storage regulation and control

Abstract

The utility model relates to a biomass peak steam supply system based on saline-water double-medium heat storage regulation and control, which comprises a biomass gasification furnace used for pyrolyzing biomass into combustible gas; the combustion furnace is used for enabling the combustible gas generated by the biomass gasification furnace to enter the combustion furnace for combustion, and heat generated by combustion heats working medium water to generate high-temperature and high-pressure steam; and the saline water double-medium heat storage tank is used for storing heat of high-temperature and high-pressure steam generated by the combustion furnace and releasing heat by utilizing the flash evaporation effect of a water medium, adjusting the instantaneous steam supply amount and stably supplying steam to a user side. According to the system, the output steam supply flow can be infinitely adjusted within the range of 0-300%, the ultra-wide load adjusting performance is achieved in the aspect of steam supply, and development and utilization of renewable energy sources are achieved.

Description

Technical Field

[0001] The utility model belongs to the field of biomass steam, and specifically relates to a biomass peak steam supply system based on brine dual-medium heat storage regulation. Background Art

[0002] Looking at the development of countries today, they are generally facing the risk challenge of the dwindling fossil energy. The energy shortage has become an important factor restricting the development of all countries.

[0003] Biomass is a renewable energy resource. The total amount of biomass energy generated by plants on Earth through photosynthesis is about 144 billion to 180 billion tons per year, equivalent to 3×10 21 kJ of energy is about 10 times the current world energy consumption. Therefore, biomass energy has an inexhaustible material basis. The traditional way of using biomass energy is to directly burn it to obtain heat energy, which has a very low utilization efficiency and brings about environmental pollution and other problems.

[0004] The existing direct-fired biomass boilers have the following shortcomings: 1. They are discontinuous and require long-term feeding operations, which are labor-intensive, and have high labor and time costs; 2. The steam production of the biomass boiler is affected by the complete combustion of the fuel and the supply of water media. When the instantaneous flow rate at the user end increases, it cannot respond quickly because combustion takes time and cannot meet the demand for increased instantaneous flow rate on the user side; 3. Since biomass fuel is a solid fuel, the contact area during combustion is limited by the shape of the combustible material, resulting in low combustion efficiency. The stacked fuels are not fully burned, and the energy contained in the biomass cannot be maximized.

[0005] In view of this, the utility model provides a biomass peak steam supply system based on brine dual-medium heat storage regulation. Utility Model Content

[0006] The purpose of the utility model is to strengthen the development and utilization of biomass energy, gasify biomass, improve energy utilization, and further efficiently store the heat generated by biomass, and provide a biomass peak steam supply system based on brine dual-medium heat storage regulation. It has ultra-wide load regulation performance in steam supply, realizes the development and utilization of renewable energy, and preferably has an instantaneous peak steam supply of 2 to 3 times the same design scale, and can also produce carbon and hydrogen by-products for production utilization.

[0007] The utility model is realized by the following technical solutions:

[0008] A biomass peak steam supply system based on brine dual-medium heat storage regulation, the system comprising:

[0009] Biomass gasifier, used to pyrolyze biomass into combustible gas;

[0010] The combustion furnace is used to allow the combustible gas generated by the biomass gasification furnace to enter the combustion furnace for combustion. The heat generated by the combustion heats the working water to generate high-temperature and high-pressure steam;

[0011] The salt water dual-medium heat storage tank is used to store heat of the high-temperature and high-pressure steam generated by the combustion furnace and release heat by the flash evaporation of the water medium, thereby adjusting the instantaneous steam supply and providing stable steam supply to the user side.

[0012] Furthermore, the air inlet of the combustion furnace is connected to the combustible gas outlet of the biomass gasification furnace through a pipeline, and the steam outlet of the combustion furnace is connected to the steam inlet of the brine dual-medium heat storage tank through a pipeline. At the same time, the steam outlet of the combustion furnace is directly connected to the user end through a switching valve, and the steam outlet of the heat storage tank is also connected to the user end through a corresponding pipeline. Regulating valves are arranged on the steam outlet of the combustion furnace, the steam inlet of the heat storage tank, and the steam outlet of the heat storage tank;

[0013] The brine dual-medium heat storage tank comprises a steam collecting pipe and a surrounding pipe wound on the steam collecting pipe, in which phase change salt is encapsulated, the steam collecting pipe is connected to the steam outlet of the combustion furnace, the inner cavity of the heat storage tank is filled with water medium, and a nozzle is arranged on the steam collecting pipe.

[0014] Furthermore, the steam collecting pipe includes a plurality of horizontally arranged annular pipes, a horizontal guide pipe arranged on the diameter of the corresponding annular pipe and a vertical guide pipe connected to the horizontal guide pipe, the surrounding pipe is evenly wound on the annular pipe of the steam collecting pipe, a plurality of nozzles are arranged on the annular pipe of the steam collecting pipe, the nozzles and the surrounding pipe do not interfere with each other, the vertical guide pipe of the steam collecting pipe is connected to the steam inlet of the heat storage tank, a steam-water separator is arranged on the top of the heat storage tank, and is connected to the steam outlet of the heat storage tank, the inner cavity of the heat storage tank is filled with water medium, and the filling amount of the water medium shall not exceed 80% of the inner cavity space of the heat storage tank.

[0015] Furthermore, a first discharge port for byproduct carbon and a second discharge port for byproduct hydrogen are provided at the lower part of the biomass gasifier.

[0016] The first discharge port is connected to a formed carbon preparation device or an activated carbon processing device, and the second discharge port is connected to a hydrogen storage device.

[0017] Preferably, the steam supply flow rate output by the system can be infinitely adjusted within the range of 0-300%, wherein 300% means that the steam supply flow rate output is three times the rated design flow rate value.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] (1) The utility model provides a biomass peak steam supply system based on brine dual-medium heat storage regulation. Compared with conventional biomass boilers, the key is that it can achieve peak steam supply and set up a water dual-medium storage tank. When the user side demand varies greatly, the system has ultra-wide load regulation performance, and the instantaneous peak steam supply reaches 2 to 3 times of the same design scale, which can meet the instantaneous ultra-high flow demand on the user side.

[0020] (2) The utility model converts biomass into combustible gas by pyrolysis and gasification. Compared with the original direct combustion of biomass, the gasification of biomass into combustible gas can greatly increase the combustion contact area, making the combustion more complete and thus improving the combustion efficiency. This method can fully tap the energy contained in the biomass; secondly, the pyrolysis and gasification of biomass can obtain by-product carbon, and the pressed charcoal can be widely used in industrial furnaces, civilian barbecues and other occasions. It can also be processed into activated carbon for use in the sugar, pharmaceutical and chemical industries, and its economic benefits are significant.

[0021] (3) The utility model uses biomass thermal decomposition to produce gas for use in gas furnaces during the heat storage period. Compared with conventional biomass boilers, this system transforms a biomass gas boiler that is discontinuous and requires long-term feeding into a vaporization device that only works during the heat storage period, which can greatly reduce labor intensity, save time costs, and improve the system's full automation level. Secondly, compared with the traditional direct combustion technology, the utility model uses vaporization combustion technology. The value-added green hydrogen by-product of vaporization can extend the downstream industrial chain and improve the security level of my country's multiple energy supplies.

[0022] (4) The utility model system has high energy storage density and can meet the stable high-grade steam supply demand. Moreover, the steam supply flow rate can be infinitely adjusted within a large range. For example, when the rated design flow rate of a conventional system is 3 t / h, when the demand on the user side changes significantly, the steam supply is prone to fluctuating and unstable. The utility model system can instantly reach 9 t / h and can effectively cope with such fluctuations.

[0023] The utility model heat storage tank can increase the storage capacity of water medium under the same conditions, thereby increasing the flash evaporation capacity of steam, and there is no problem of difficulty in fixing vertical pipelines, so that the internal manufacturing of the tank body is simpler, the operation is safer and more reliable, and it is ensured that the system takes into account the needs of wide steam supply and stable high-grade steam supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure of the biomass peak steam supply system based on brine dual-medium heat storage regulation.

[0025] Figure 2 This is a pipeline layout diagram of a steam collecting pipe 301 of an embodiment of a heat storage tank in the present utility model.

[0026] In the figure, 1, biomass gasification furnace; 2, combustion furnace; 3, heat storage tank; 301, steam collecting pipe; 302 surrounding pipe. DETAILED DESCRIPTION

[0027] like Figure 1 As shown, the utility model provides a biomass peak steam supply system based on brine dual-medium heat storage regulation, comprising: a biomass gasifier 1, a combustion furnace 2, and a heat storage tank 3. The air inlet of the combustion furnace 2 is connected to the combustible gas outlet of the biomass gasifier 1 through a pipeline, so that the combustible gas generated by the biomass gasifier 1 enters the combustion furnace 2 for combustion. The heat generated by the combustion heats the working medium water to generate high-temperature and high-pressure steam. The steam outlet of the combustion furnace 2 is connected to the steam inlet of the heat storage tank 3 through a pipeline, and at the same time, the steam outlet of the combustion furnace 2 is directly connected to the user end through a switching valve, and the steam outlet of the heat storage tank 3 is connected to the user end through a pipeline. Regulating valves are arranged on the steam outlet of the combustion furnace 2 and the steam inlet and steam outlet of the heat storage tank 3. The high-temperature and high-pressure steam generated by the combustion furnace 2 can either directly lead to the user end or provide heat to the user end through the heat storage tank.

[0028] Furthermore, the heat storage tank 3 has two kinds of pipes, namely a steam collecting pipe 301 and a surrounding pipe 302. High-temperature and high-pressure saturated steam is introduced into the steam collecting pipe 301, and phase change salt is introduced into the surrounding pipe 302. The steam collecting pipe 301 includes a plurality of horizontally arranged annular pipes 3011, a horizontal guide pipe 3012 arranged on the diameter of the corresponding annular pipe, and a vertical guide pipe 3013 connected to the horizontal guide pipe. The surrounding pipe 302 is evenly wound on the annular pipe of the steam collecting pipe 301. A plurality of nozzles are arranged on the circulating pipe of the steam collecting pipe 301, and the nozzles and the surrounding pipe 302 do not interfere with each other. The vertical guide pipe of the steam collecting pipe 301 is connected to the steam inlet of the heat storage tank 3. A steam-water separator is arranged on the top of the heat storage tank 3 and is connected to the steam outlet of the heat storage tank 3. The inner cavity of the heat storage tank 3 is filled with water medium, and the proportion shall not exceed 80% of the inner cavity space.

[0029] The horizontal guide pipe is fixedly connected to the annular pipe but not connected, and a plurality of annular pipes are evenly distributed along the height direction of the heat storage tank.

[0030] The outer surface of the heat storage tank in the utility model is wrapped with a heat preservation layer; the steam collecting pipe and the surrounding pipe are both located below the liquid surface of the water medium.

[0031] The working principle of the biomass peak gas supply system based on brine dual-medium heat storage regulation is as follows: the biomass raw material enters the biomass gasifier 1, undergoes solid fuel drying, thermal decomposition reaction, reduction reaction, oxidation reaction, and is finally converted into combustible gases such as carbon monoxide, hydrogen and low molecular hydrocarbons. The combustible gas enters the combustion furnace 2 through a pipeline, heats the working medium water, and generates high-temperature and high-pressure saturated steam. The high-temperature and high-pressure saturated steam can directly enter the user end through a pipeline for use, and can also enter the heat storage tank 3 for heat storage. The regulating valve on the steam inlet pipeline of the heat storage tank 3 is opened, and the high-temperature and high-pressure saturated steam enters the steam collecting pipe 301 in the heat storage tank 3 through the steam inlet of the heat storage tank 3, and is sprayed into the water medium in the inner cavity of the heat storage tank 3 through the nozzle on the steam collecting pipe 301 to heat the water medium. The high-temperature and high-pressure saturated steam in the steam collecting pipe 301 transfers heat to the phase change salt in the annular pipe 302 through the pipe wall in the form of convection heat exchange and heat conduction, so that the temperature of the phase change salt increases. At the same time, the phase change salt transfers heat to the water medium through the pipe wall in the form of heat conduction. When the water medium temperature reaches the set temperature, heat storage can be stopped and the regulating valve on the steam inlet pipe of the heat storage tank 3 can be closed.

[0032] Heat release process: When the heat storage tank 3 releases heat, the regulating valve on the steam outlet pipe of the heat storage tank 3 is opened, and the water medium in the heat storage tank 3 flashes, enters the steam outlet pipe through the steam-water separator on the top of the heat storage tank 3, and flows to the user end. Since the heat storage tank is provided with a surrounding pipe 302 of phase change salt, the storage capacity of the heat storage system can be further improved, and the flash evaporation amount of the system steam can be further increased for heating users.

[0033] The utility model uses the flash evaporation principle to meet the steam supply requirements. The molten salt does not flow during the entire use process, and the instantaneous gas supply of the system can be adjusted. The system heat storage capacity is increased, and high-grade stable steam output can be maintained under the same conditions.

[0034] The above is an exemplary description of the present invention. It should be noted that, without departing from the core of the present invention, any simple deformation, modification or other equivalent replacement that can be done by other technical personnel in this field without expending creative labor falls within the protection scope of the present invention.

[0035] Anything not described in the present invention is applicable to the prior art.

Claims

1. A biomass peak steam supply system based on brine dual-medium heat storage regulation, characterized in that: The system comprises: Biomass gasifier, used to pyrolyze biomass into combustible gas; The combustion furnace is used to allow the combustible gas generated by the biomass gasification furnace to enter the combustion furnace for combustion. The heat generated by the combustion heats the working water to generate high-temperature and high-pressure steam; The salt water dual-medium heat storage tank is used to store heat of the high-temperature and high-pressure steam generated by the combustion furnace and release heat by the flash evaporation of the water medium, thereby adjusting the instantaneous steam supply and providing stable steam supply to the user side.

2. The biomass peak steam supply system based on brine dual-medium thermal storage regulation according to claim 1 is characterized in that: The air inlet of the combustion furnace is connected to the combustible gas outlet of the biomass gasification furnace through a pipeline, and the steam outlet of the combustion furnace is connected to the steam inlet of the brine dual-medium heat storage tank through a pipeline. At the same time, the steam outlet of the combustion furnace is directly connected to the user end through a switching valve, and the steam outlet of the heat storage tank is also connected to the user end through a corresponding pipeline. Regulating valves are arranged on the steam outlet of the combustion furnace, the steam inlet of the heat storage tank, and the steam outlet of the heat storage tank; The brine dual-medium heat storage tank comprises a steam collecting pipe and a surrounding pipe wound on the steam collecting pipe, in which phase change salt is encapsulated, the steam collecting pipe is connected to the steam outlet of the combustion furnace, the inner cavity of the heat storage tank is filled with water medium, and a nozzle is arranged on the steam collecting pipe.

3. The biomass peak steam supply system based on brine dual-medium thermal storage regulation according to claim 2 is characterized in that: The steam collecting pipe comprises a plurality of horizontally arranged annular pipes, a horizontal flow guiding pipe arranged on the diameter of the corresponding annular pipes and a vertical flow guiding pipe connected with the horizontal flow guiding pipe. The surrounding pipe is evenly wound on the annular pipe of the steam collecting pipe. The annular pipe of the steam collecting pipe is provided with a plurality of nozzles. The nozzles and the surrounding pipes do not interfere with each other. The vertical flow guiding pipe of the steam collecting pipe is connected with the steam inlet of the heat storage tank. A steam-water separator is arranged on the top of the heat storage tank and is connected with the steam outlet of the heat storage tank. The inner cavity of the heat storage tank is filled with water medium. The filling amount of the water medium shall not exceed 80% of the inner cavity space of the heat storage tank.

4. The biomass peak steam supply system based on brine dual-medium thermal storage regulation according to claim 1 is characterized in that: The lower part of the biomass gasifier is provided with a first discharge port for byproduct carbon and a second discharge port for byproduct hydrogen. The first discharge port is connected to a shaped carbon preparation device or an activated carbon processing device, and the second discharge port is connected to a hydrogen storage device.

5. The biomass peak steam supply system based on brine dual-medium thermal storage regulation according to claim 1 is characterized in that: The system has ultra-wide load regulation performance, and the instantaneous peak steam supply is 2 to 3 times that of the same design scale.

6. The biomass peak steam supply system based on brine dual-medium thermal storage regulation according to claim 1 is characterized in that: The steam supply flow rate output by the system can be infinitely adjusted within the range of 0-300%, wherein 300% means that the steam supply flow rate output is three times the rated design flow rate value.

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