A heat storage steam supply system

Abstract

The present invention discloses a heat storage type steam supply system, which includes a gas-liquid heat exchanger, a heat storage tank, a heat exchanger, a preheater and a water tank; wherein the waste heat gas inlet of the gas-liquid heat exchanger is connected to the industrial high-temperature exhaust port, the first medium inlet of the gas-liquid heat exchanger is connected to the second medium outlet of the heat storage tank, the first medium outlet of the gas-liquid heat exchanger is connected to the second medium inlet of the heat storage tank; the third medium outlet of the heat storage tank is connected to the fourth medium inlet of the heat exchanger, the fourth medium outlet of the heat exchanger is connected to the fifth medium inlet of the preheater, the fifth medium outlet of the preheater is connected to the third medium inlet of the heat storage tank, the water tank is connected to the water inlet of the preheater, the water outlet of the preheater is connected to the liquid inlet of the heat exchanger, and the steam outlet of the heat exchanger is connected to the pipeline of the heat user. The system can continuously and stably supply steam, and can improve the utilization rate of the heat storage tank, saving the manufacturing cost of the system.

Description

Technical Field

[0001] The invention relates to the technical field of energy utilization, and in particular to a heat storage type steam supply system. Background Art

[0002] Energy security has an extremely important strategic position in my country's national economy. The central government has put forward the goals of "carbon neutrality" and "carbon peak". my country has vigorously developed renewable energy and strengthened energy conservation and emission reduction in high-energy-consuming industries. The total amount of industrial waste heat in my country is huge. The waste heat resources of the steel industry, cement industry, and synthetic ammonia industry rank in the top three. China's industrial sector energy consumption accounts for about 70% of the country's energy consumption, and its energy utilization through thermal energy is more than 90%. China's power generation industry consumes nearly 2 billion tons of coal per year (accounting for about 45% of total energy consumption), and about 40-50% is discharged as low-grade waste heat. A large amount of waste heat is discharged without being fully utilized, which not only causes huge energy waste, but also brings thermal pollution to the atmosphere. Therefore, storing waste heat and continuously and stably outputting it is of great significance to achieve the vision of "carbon neutrality" and "carbon peak". Summary of the invention

[0003] The present invention provides a heat storage type steam supply system, which can well solve the problems of intermittent and fluctuating waste heat, can continuously and stably supply steam, and can improve the utilization rate of the heat storage tank, saving the manufacturing cost of the system.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] A heat storage steam supply system comprises a gas-liquid heat exchanger, a heat storage tank, a heat exchanger, a preheater and a water tank; wherein:

[0006] The gas-liquid heat exchanger includes a waste heat gas inlet, a waste heat gas outlet, a first medium inlet and a first medium outlet, the heat storage tank includes a second medium inlet, a second medium outlet, a third medium inlet and a third medium outlet, the heat exchanger includes a fourth medium inlet, a fourth medium outlet, a liquid inlet and a steam outlet, and the preheater includes a fifth medium inlet, a fifth medium outlet, a water inlet and a water outlet;

[0007] The waste heat gas inlet is connected to the industrial high-temperature exhaust port through a pipeline, the waste heat gas outlet is used to discharge industrial exhaust gas, the first medium inlet is connected to the second medium outlet through a pipeline, and the first medium outlet is connected to the second medium inlet through a pipeline, so as to recover and store industrial waste heat through the heat transfer medium flowing through the gas-liquid heat exchanger and the heat storage tank;

[0008] The third medium outlet is connected to the fourth medium inlet through a pipeline, the fourth medium outlet is connected to the fifth medium inlet through a pipeline, the fifth medium outlet is connected to the third medium inlet through a pipeline, the water tank is connected to the water inlet through a pipeline, the water outlet is connected to the liquid inlet through a pipeline, and the steam outlet is connected to a pipeline of a heat user, so that the heat stored in the heat storage tank is supplied to the heat user through the heat transfer medium flowing through the heat exchanger and the preheater.

[0009] The heat storage steam supply system provided by the embodiment of the present invention includes a gas-liquid heat exchanger, a heat storage tank, a heat exchanger, a preheater and a water tank, wherein the waste heat gas inlet of the gas-liquid heat exchanger is connected to the industrial high-temperature exhaust port, the waste heat gas outlet of the gas-liquid heat exchanger is used to discharge the industrial exhaust gas, and can form an exhaust circuit for the industrial exhaust gas, the first medium inlet of the gas-liquid heat exchanger is connected to the second medium outlet on the heat storage tank, the first medium outlet of the gas-liquid heat exchanger is connected to the second medium inlet on the heat storage tank, the heat transfer medium can flow through the second medium outlet on the heat storage tank, the first medium inlet of the gas-liquid heat exchanger, the first medium outlet and the second medium inlet of the heat storage tank in sequence, and can form a heat storage circuit, so that the heat transfer medium and the industrial high-temperature exhaust gas are heat exchanged, and the industrial waste heat in the industrial high-temperature exhaust gas is recovered and stored in the heat storage tank; and Moreover, the third medium outlet of the heat storage tank is connected with the fourth medium inlet of the heat exchanger, the fourth medium outlet of the heat exchanger is connected with the fifth medium inlet of the preheater, and the fifth medium outlet of the heat exchanger is connected with the third medium inlet of the heat storage tank. The heat transfer medium can flow through the third medium outlet of the heat storage tank, the fourth medium inlet of the heat exchanger, the fourth medium outlet, the fifth medium inlet of the preheater, the fifth medium outlet and the third medium inlet of the heat storage tank in sequence, so as to form a heating circuit. The water tank is connected with the water inlet of the preheater, the water outlet of the preheater is connected with the liquid inlet of the heat exchanger, and the steam outlet of the heat exchanger is connected with the pipeline of the heat user. The water in the water tank can flow through the water inlet and outlet of the preheater and the liquid inlet of the heat exchanger to exchange heat with the heat transfer medium flowing through the heat exchanger, so as to form high-temperature water vapor to supply heat to the heat user. The above-mentioned heat storage steam supply system can integrate the functions of waste heat recovery, heat storage, heat supply and steam production. Through the setting of the heat storage tank, the intermittent and fluctuating industrial waste heat can be stored first, and continuous and stable heat supply can be achieved, which well solves the problem of intermittent and fluctuating waste heat, so that the system can continuously and stably supply steam, and can simultaneously realize the functions of heat storage and heating through only the same heat storage tank, which can improve the utilization rate of the heat storage tank and save the production cost of the system.

[0010] Optionally, the material of the heat transfer medium is thermal oil or molten salt.

[0011] Optionally, when the material of the heat transfer medium is molten salt, the heat transfer medium is a mixed molten salt composed of at least one material selected from the group consisting of NaNO3, KNO3, NaNO2, Ca(NO3)2, and LiNO3.

[0012] Optionally, the melting point of the heat transfer medium is lower than 100°C, and the decomposition temperature of the heat transfer medium is greater than 500°C.

[0013] Optionally, an exhaust fan is arranged in the pipeline between the waste heat gas inlet and the industrial high-temperature exhaust port; a first heat transfer medium delivery pump is arranged on the pipeline between the second medium outlet and the first medium inlet; a second heat transfer medium delivery pump is arranged on the pipeline between the third medium outlet and the fourth medium inlet; and a circulating water pump is arranged on the pipeline connecting the water tank and the water inlet.

[0014] Optionally, a first stop valve is provided on the pipeline between the second medium outlet and the first medium inlet; a second stop valve is provided on the pipeline between the third medium outlet and the fourth medium inlet; and a third stop valve is provided on the pipeline between the water tank and the water inlet.

[0015] Optionally, the heat storage tank includes a shell, a heat storage medium, a first liquid inlet pipe, a second liquid inlet pipe, a first liquid outlet pipe, a second liquid outlet pipe and a medium guide mechanism;

[0016] The first liquid inlet pipe and the second liquid outlet pipe are arranged at the top of the shell, the first liquid outlet pipe and the second liquid inlet pipe are arranged at the bottom of the shell, and the ports of the first liquid inlet pipe, the second liquid inlet pipe, the first liquid outlet pipe and the second liquid outlet pipe located outside the shell are respectively the second medium inlet, the third medium inlet, the second medium outlet and the third medium outlet;

[0017] The heat storage medium is located inside the shell, and the liquid level of the heat storage medium submerges the ports of the first liquid inlet pipe and the second liquid outlet pipe located inside the shell, and the material of the heat storage medium is the same as that of the heat transfer medium;

[0018] The medium guiding mechanism is located between the top of the shell and the bottom of the shell, so as to guide the heat storage medium to flow in one direction along the arrangement direction of the top of the shell and the bottom of the shell.

[0019] Optionally, the medium guiding mechanism comprises a plurality of first baffles and a plurality of second baffles which are staggered and arranged in parallel along a direction from the top of the shell to the bottom of the shell; wherein,

[0020] There is a gap between adjacent first baffles and second baffles;

[0021] The first baffle has two mutually parallel side edges, both of which have a first gap with the side wall of the shell, and the other edge portions of the first baffle except the two side edges are sealed and connected to the side wall of the shell;

[0022] The edge of the second baffle is sealed to the side wall of the housing, and the middle area of ​​the second baffle has a second gap arranged parallel to the two side edges of the first baffle.

[0023] Optionally, the material of the medium guiding mechanism is a material with low thermal conductivity.

[0024] Optionally, the material of the medium guide mechanism is at least one of carbon steel, stainless steel, fiberglass, copper, brass, ceramics and polytetrafluoroplastics.

[0025] Optionally, the heat storage tank further includes a flow diversion mechanism, and ports of the first liquid inlet pipe, the second liquid inlet pipe, the first liquid outlet pipe, and the second liquid outlet pipe located inside the shell are all connected to the flow diversion mechanism.

[0026] Optionally, the diverter mechanism is in a plate shape, a cylindrical shape or a spherical shape, and has a plurality of evenly distributed through holes. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic structural diagram of a heat storage steam supply system provided in an embodiment of the present invention;

[0028] Figure 2 A schematic diagram of the working state of a heat storage steam supply system provided by an embodiment of the present invention;

[0029] Figure 3 A schematic diagram of the working state of another heat storage steam supply system provided by an embodiment of the present invention;

[0030] Figure 4 A schematic diagram of the structure of a heat storage tank provided by an embodiment of the present invention;

[0031] Figure 5 A schematic diagram of the working state of a heat storage tank provided by an embodiment of the present invention;

[0032] Figure 6 A schematic diagram of the working state of another heat storage tank provided by an embodiment of the present invention;

[0033] Figure 7 A schematic structural diagram of a first baffle provided in an embodiment of the present invention;

[0034] Figure 8 A schematic diagram of the structure of a second baffle provided by an embodiment of the present invention;

[0035] Fig. 9 A schematic diagram of the structure of a diversion mechanism provided by an embodiment of the present invention;

[0036] Fig.10 A schematic structural diagram of another diversion mechanism provided in an embodiment of the present invention.

[0037] icon:

[0038] 1-gas-liquid heat exchanger; 2-heat storage tank; 21-shell; 211-inner shell; 212-insulation layer; 213-outer shell; 22-heat storage medium; 231-first liquid inlet pipe; 232-second liquid inlet pipe; 233-first liquid outlet pipe; 234-second liquid outlet pipe; 24-medium guide mechanism; 241-first baffle; 2411-first gap; 242-second baffle; 2421-second gap; 25-diversion mechanism; 251-through hole; 3-heat exchanger; 4-preheater; 5-water tank; 6-industrial high-temperature exhaust port; 7-heat user; 8-exhaust fan; 9-first heat transfer medium delivery pump; 10-second heat transfer medium delivery pump; 11-circulating water pump; 12-first stop valve; 13-second stop valve; 14-third stop valve. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] Please refer to Figure 1 , Figure 2 and Figure 3 The present invention provides a heat storage steam supply system, comprising a gas-liquid heat exchanger 1, a heat storage tank 2, a heat exchanger 3, a preheater 4 and a water tank 5; wherein,

[0041] The gas-liquid heat exchanger 1 includes a waste heat gas inlet, a waste heat gas outlet, a first medium inlet and a first medium outlet, the heat storage tank 2 includes a second medium inlet, a second medium outlet, a third medium inlet and a third medium outlet, the heat exchanger 3 includes a fourth medium inlet, a fourth medium outlet, a liquid inlet and a steam outlet, and the preheater 4 includes a fifth medium inlet, a fifth medium outlet, a water inlet and a water outlet;

[0042] The waste heat gas inlet is connected to the industrial high-temperature exhaust port 6 through a pipeline, the waste heat gas outlet is used to discharge industrial exhaust gas, the first medium inlet is connected to the second medium outlet through a pipeline, and the first medium outlet is connected to the second medium inlet through a pipeline, so as to recover and store industrial waste heat through the heat transfer medium flowing through the gas-liquid heat exchanger 1 and the heat storage tank 2;

[0043] The third medium outlet is connected to the fourth medium inlet through a pipeline, the fourth medium outlet is connected to the fifth medium inlet through a pipeline, the fifth medium outlet is connected to the third medium inlet through a pipeline, the water tank 5 is connected to the water inlet through a pipeline, the water outlet is connected to the liquid inlet through a pipeline, and the steam outlet is connected to the pipeline of the heat user 7, so that the heat stored in the heat storage tank 2 is supplied to the heat user 7 through the heat transfer medium flowing through the heat exchanger 3 and the preheater 4.

[0044] In the heat storage steam supply system provided by the embodiment of the present invention, Figure 1 As shown, it includes a gas-liquid heat exchanger 1, a heat storage tank 2, a heat exchanger 3, a preheater 4 and a water tank 5, wherein Figure 2 As shown, the waste heat gas inlet of the gas-liquid heat exchanger 1 is connected to the industrial high-temperature exhaust port 6, and the waste heat gas outlet of the gas-liquid heat exchanger 1 is used to discharge industrial exhaust gas, which can form an exhaust circuit for industrial exhaust gas. The first medium inlet of the gas-liquid heat exchanger 1 is connected to the second medium outlet on the heat storage tank 2, and the first medium outlet of the gas-liquid heat exchanger 1 is connected to the second medium inlet on the heat storage tank 2. The heat transfer medium can flow through the second medium outlet on the heat storage tank 2, the first medium inlet of the gas-liquid heat exchanger 1, the first medium outlet and the second medium inlet of the heat storage tank 2 in sequence, which can form a heat storage circuit, so that the heat transfer medium exchanges heat with the industrial high-temperature exhaust gas, recovers the industrial waste heat in the industrial high-temperature exhaust gas and stores it in the heat storage tank 2; and as Figure 3As shown, the third medium outlet of the heat storage tank 2 is connected to the fourth medium inlet of the heat exchanger 3, the fourth medium outlet of the heat exchanger 3 is connected to the fifth medium inlet of the preheater 4, and the fifth medium outlet of the heat exchanger 3 is connected to the third medium inlet of the heat storage tank. The heat transfer medium can flow through the third medium outlet of the heat storage tank 2, the fourth medium inlet of the heat exchanger 3, the fourth medium outlet, the fifth medium inlet of the preheater 4, the fifth medium outlet and the third medium inlet of the heat storage tank 2 in sequence, so as to form a heating circuit. The water tank 5 is connected to the water inlet of the preheater 4, the water outlet of the preheater 4 is connected to the liquid inlet of the heat exchanger 3, and the steam outlet of the heat exchanger 3 is connected to the pipeline of the heat user 7. The water in the water tank 5 can flow through the water inlet and outlet of the preheater 4 and the liquid inlet of the heat exchanger 3 to exchange heat with the heat transfer medium flowing through the heat exchanger 3, so as to form high-temperature water vapor to supply heat to the heat user 7. The above-mentioned heat storage steam supply system can integrate the functions of waste heat recovery, heat storage, heat supply and steam production. Through the setting of the heat storage tank 2, the intermittent and fluctuating industrial waste heat can be stored first, and continuous and stable heat supply can be achieved, which well solves the problem of intermittent and fluctuating waste heat, so that the system can continuously and stably supply steam, and can simultaneously realize the functions of heat storage and heating through only the same heat storage tank 2, which can improve the utilization rate of the heat storage tank 2 and save the production cost of the system.

[0045] In the above-mentioned heat storage steam supply system, the industrial high-temperature exhaust port can be the high-temperature exhaust port of enterprises such as steel plants, cement plants, and chemical plants. The discharged industrial waste heat can be medium- and high-temperature flue gas or water vapor, which can provide a heat source for the steam supply system. After the industrial waste heat is exchanged through the gas-liquid heat exchanger 1, it can flow into the flue pipe and discharge the gas into the atmosphere.

[0046] The heat transfer medium flowing in the pipeline of the above-mentioned heat storage steam supply system can be heat transfer oil or molten salt. Among them, molten salt as a heat transfer medium has the advantages of wide source, low price, low corrosiveness, high heat storage density, and low system pressure.

[0047] For example, the heat transfer medium may be a mixed molten salt composed of one or more of NaNO3, KNO3, NaNO2, Ca(NO3)2, LiNO3, such as a binary Solar salt, a ternary HTS salt or a ternary HTS XL salt.

[0048] Furthermore, in order to reduce heat loss and power loss in the system pipeline, the heat transfer medium can be a molten salt heat storage material with a melting point lower than 100°C and a decomposition temperature, i.e., an upper limit use temperature, higher than 500°C.

[0049] The structure of the gas-liquid heat exchanger 1 can be a plate type, a shell-and-tube type, a shell-and-tube type or other heat exchange structure, which is not limited here and can be selected according to actual conditions, and can perform heat exchange between industrial waste heat and the heat transfer medium in the pipeline.

[0050] The structure of the heat exchanger 3 can be a plate type, a shell and tube type, a shell and tube type, etc. The material can be steel, stainless steel or copper. The structure and material of the heat exchanger 3 are not limited here and can be determined according to actual conditions.

[0051] The water in the water tank 5 may be softened water.

[0052] The above-mentioned preheater 4 may include a heat exchange coil and an electric heating rod, the electric heating rod is used to heat the water flowing through the preheater 4, and the heat exchange coil is used to make the heat transfer medium and the heated water exchange heat, so as to heat the water in the preheater 4. It should be noted that the temperature of the water before the heat exchange in the preheater 4 should be higher than the melting point of the heat transfer medium, so it is necessary to use an electric heating rod to heat the temperature of the water before the heat exchange in the preheater 4 to a temperature higher than the melting point of the heat transfer medium, so as to avoid the heat transfer medium and water from solidifying after the heat exchange. For example, when the heat transfer medium is molten salt, the water temperature in the preheater 4 should be higher than the melting point of the molten salt, so as to avoid the solidification of the molten salt. Therefore, when the preheater 4 is started for the first time, the electric heating rod in the preheater 4 should be turned on to heat the water to above the melting point of the heat transfer medium.

[0053] In the above-mentioned heat storage type steam supply system, an exhaust fan 8 can be arranged in the pipeline between the waste heat gas inlet of the gas-liquid heat exchanger 1 and the industrial high-temperature exhaust port, so that the industrial waste heat gas from the industrial high-temperature exhaust port is discharged into the gas-liquid heat exchanger 1; a first heat transfer medium delivery pump 9 can be arranged on the pipeline between the second medium outlet of the heat storage tank 2 and the first medium inlet of the gas-liquid heat exchanger 1, which can transport the low-temperature heat transfer medium from the heat storage tank 2 to the gas-liquid heat exchanger 1, and a second heat transfer medium delivery pump 10 can be arranged on the pipeline between the third medium outlet of the heat storage tank 2 and the fourth medium inlet of the heat exchanger 3, which can transport the high-temperature heat transfer medium from the heat storage tank 2 to the heat exchanger 3; a circulating water pump 11 can be arranged on the pipeline connecting the water tank 5 and the water inlet, which can pump water in the water tank 5 into the preheater 4 to ensure that the water continues to flow to the water inlet of the preheater 4.

[0054] Specifically, the exhaust fan 8 can be a high-temperature exhaust fan, and the material can be cast steel, carbon steel or stainless steel, etc.; the types of the first heat transfer medium delivery pump 9 and the second heat transfer medium delivery pump 10 can be selected according to the type of heat transfer medium. For example, the first heat transfer medium delivery pump 9 and the second heat transfer medium delivery pump 10 can be thermal oil pumps or molten salt pumps, which are not limited here.

[0055] In the above-mentioned heat storage type steam supply system, a first stop valve 12 may be provided on the pipeline between the second medium outlet of the heat storage tank 2 and the first medium inlet of the gas-liquid heat exchanger 1, and the connection between the heat storage tank 2 and the gas-liquid heat exchanger 1 can be adjusted by adjusting the switch state of the first stop valve 12 on the pipeline to store heat; a second stop valve 13 may be provided on the pipeline between the third medium outlet of the heat storage tank 2 and the fourth medium inlet of the heat exchanger 3, and the connection between the heat storage tank 2 and the heat exchanger 3 and the preheater 4 can be adjusted by adjusting the switch state of the second stop valve 13 on the pipeline to supply heat to the outside; a third stop valve 14 may be provided on the pipeline between the water tank 5 and the water inlet of the preheater 4, and the connection between the water tank 5 and the water inlet of the preheater 4 can be adjusted by adjusting the switch state of the third stop valve 14 on the pipeline to realize water transportation.

[0056] In the above-mentioned heat storage steam supply system, specifically, Figure 4 As shown, the heat storage tank 2 may include a shell 21, a heat storage medium 22, a first liquid inlet pipe 231, a second liquid inlet pipe 232, a first liquid outlet pipe 233, a second liquid outlet pipe 234 and a medium guide mechanism 24; wherein the first liquid inlet pipe 231 and the second liquid outlet pipe 234 may be arranged at the top of the shell 21, the first liquid outlet pipe 233 and the second liquid inlet pipe 232 may be arranged at the bottom of the shell 21, and the first liquid inlet pipe 231, the second liquid inlet pipe 232, the first liquid outlet pipe 233 and the second liquid outlet pipe 234 are located outside the shell 21. The ports are respectively the second medium inlet, the third medium inlet, the second medium outlet and the third medium outlet; the heat storage medium 22 is located inside the shell 21, and the liquid level of the heat storage medium 22 submerges the ports of the first liquid inlet pipe 231 and the second liquid outlet pipe 234 located inside the shell 21, and the material of the heat storage medium 22 is the same as that of the heat transfer medium; the medium guide mechanism 24 is located between the top of the shell 21 and the bottom of the shell 21, so as to guide the heat storage medium 22 to flow unidirectionally along the arrangement direction of the top of the shell 21 and the bottom of the shell 21. Since the medium guide mechanism 24 is provided in the heat storage tank 2, the flow direction of the heat transfer medium in the heat storage tank 2 can be guided, and convective heat transfer between the high-temperature heat transfer medium at the top and the low-temperature heat transfer medium at the bottom can be avoided. The functions of heat storage and heat supply can be realized by only one heat storage tank 2, and the problems of low volume utilization and high cost when multiple heat storage tanks 2 are used for heat storage and heat supply respectively are avoided.

[0057] Specifically, during the heat storage process of the heat storage tank 2, if Figure 5 As shown, the low-temperature heat transfer medium is pumped from the second medium outlet at the bottom of the heat storage tank 2 to the first medium inlet of the gas-liquid heat exchanger 1, and the high-temperature heat transfer medium obtained after heat exchange through the gas-liquid heat exchanger 1 enters the heat storage tank 2 from the second medium inlet at the top of the heat storage tank 2. The high-temperature heat transfer medium can flow from the top to the bottom of the heat storage tank 2 along the medium guide mechanism 24, and press the low-temperature heat transfer medium in the heat storage tank 2 to the bottom of the heat storage tank 2 to perform a heat storage cycle.

[0058] On the other hand, during the heating process of the heat storage tank 2, if Figure 6 As shown, the high-temperature heat transfer medium flows from the third medium outlet at the top of the heat storage tank 2 to the fourth medium inlet of the heat exchanger 3. The high-temperature heat transfer medium is cooled down after heat exchange with the high-temperature water, and then flows into the preheater 4 to exchange heat with the water and flows back to the third medium inlet at the bottom of the heat storage tank 2. The heat transfer medium returned to the heat storage tank 2 flows from the bottom of the heat storage tank 2 to the top of the heat storage tank 2 along the medium guide mechanism 24, so that the high-temperature heat transfer medium in the heat storage tank 2 can be pressed to the top of the heat storage tank 2 to perform a heat supply cycle.

[0059] In the above heat storage tank 2, if Figure 4 As shown, the medium guide mechanism 24 may be configured to include a plurality of first baffles 241 and a plurality of second baffles 242 that are staggered and arranged in parallel along a direction from the top of the housing 21 to the bottom of the housing 21;

[0060] There is a gap between the adjacent first baffles 241 and the second baffles 242; Figure 7 As shown, the first baffle 241 has two parallel sides, and the two sides and the side wall of the shell 21 have a first gap 2411, and the edge portion of the first baffle 241 other than the two sides is sealed and connected to the side wall of the shell 21; Figure 8 As shown, the edge of the second baffle plate 242 is sealed to the side wall of the housing 21 , and the middle area of ​​the second baffle plate 242 has a second gap 2421 arranged parallel to the two side edges of the first baffle plate 241 .

[0061] The medium guiding mechanism 24 may be a "bow" type structure layout, and the heat transfer medium may flow through the first gap 2411 and the second gap 2421, and the flow direction of the heat transfer medium may be guided. The first baffle 241 and the second baffle 242 may concentrate the low-temperature heat transfer medium at the bottom of the heat storage tank 2, and the high-temperature heat transfer medium at the top of the heat storage tank 2. Through the barrier effect of the first baffle 241 and the second baffle 242, convective heat transfer between the high-temperature heat transfer medium at the top and the low-temperature heat transfer medium at the bottom may be avoided, and the flow speed of the heat transfer medium in the heat storage tank 2 may be slowed down, so that the problems of low heat storage or heat release, insufficient heat charging and heat release, etc. of the heat storage tank 2 may be avoided.

[0062] Specifically, in the above-mentioned medium guiding mechanism 24, the intervals between each two adjacent first baffles 241 and second baffles 242 can be the same, the side edges of each first baffle 241 extend along the first direction, and the two first gaps 2411 formed by the first baffle 241 and the side wall of the shell 21 are symmetrically arranged.

[0063] The material of the medium guide mechanism 24 may be a low thermal conductivity material, which can ensure that the heat transfer medium transfers heat through the path guided by the medium guide mechanism, avoids the heat transfer medium directly transferring heat through the medium guide mechanism, and ensures good heat transfer of the heat transfer medium in the heat storage tank. For example, the material of the medium guide mechanism 24 may be a ceramic material or polytetrafluoroplastic. In addition, the material of the medium guide mechanism 24 may also be a high thermal conductivity material, such as carbon steel, stainless steel, fiberglass, etc. The material of the medium guide mechanism can be specifically selected according to actual needs and is not limited here.

[0064] Specifically, the material of the medium guide mechanism 24 can be at least one of carbon steel, stainless steel, fiberglass, copper, brass, ceramics and polytetrafluoroplastics.

[0065] In the above-mentioned heat storage steam supply system, if Figure 4 As shown, the heat storage tank 2 also includes a diverter mechanism 25, and the ports of the first liquid inlet pipe 231, the second liquid inlet pipe 232, the first liquid outlet pipe 233 and the second liquid outlet pipe 234 located inside the shell 21 are all connected to the diverter mechanism 25, which can slow down and disperse the heat transfer medium in the process of flowing into and out of the heat storage tank 2, discharge the surrounding high-temperature or low-temperature heat transfer medium, and avoid causing large agitation to the heat storage material in the heat storage tank 2.

[0066] Specifically, the flow dividing mechanism 25 may be plate-shaped, cylindrical or spherical, for example, Fig. 9 The middle flow dividing mechanism 25 is cylindrical. Fig.10 The middle flow dividing mechanism 25 is in the shape of a plate, and has a plurality of evenly distributed through holes 251 on the flow dividing mechanism 25. The heat transfer medium can be divided through the through holes 251 on the flow dividing structure.

[0067] Specifically, the material of the diverter mechanism 25 can be a material with high thermal conductivity. For example, the material of the diverter mechanism 25 is one of copper, steel and iron, which can have good thermal conductivity and is conducive to the heat transfer of the heat transfer medium in the heat storage tank 2.

[0068] In the above-mentioned heat storage steam supply system, if Figure 4 As shown, the shell 21 of the heat storage tank 2 may include an inner shell 211 , a heat-insulating layer 212 , and an outer shell 213 , which are sequentially arranged in a direction from the inside of the shell 21 to the outside.

[0069] Among them, the material of the above-mentioned inner shell 211 can be a high thermal conductivity material, which is beneficial to the transmission of heat by the heat transfer medium in the heat storage tank 2; specifically, the material of the above-mentioned inner shell 211 can be one of copper, steel or iron, which is not limited here and can be determined according to actual conditions.

[0070] The material of the above-mentioned insulation layer 212 can be a low thermal conductivity material, which can ensure the heat storage function of the heat storage tank 2. Specifically, the material of the insulation layer 212 is at least one of vermiculite, foam glass, rock wool, aerogel felt and ceramic fiber, which is not limited here and can be determined according to actual conditions.

[0071] The material of the housing 213 can be one of a steel plate, an aluminum plate, an iron plate and a plastic plate, which is not limited here and can be determined according to actual conditions.

[0072] In the above-mentioned heat storage steam supply system, the inner shell 211 can be set as a cylindrical structure, which is simple and is conducive to the flow of the heat transfer medium in the heat storage tank 2. The inner shell 211 can also be a structure of other shapes, which is not limited here and can be determined according to actual conditions. The above-mentioned inner shell 211 and the first baffle 241 and the second baffle 242 in the medium guide mechanism 24 can be connected by welding, bolting or slotting, which is not limited here and can be determined according to actual conditions.

[0073] In the above-mentioned heat storage tank 2, the top of the shell 21 can be a container cover, and the container cover can be set to a semicircular or arc structure.

[0074] In the above-mentioned heat storage type steam supply system, the number of heat storage tanks 2 can be set to at least one. For example, a plurality of heat storage tanks 2 can be set in the heat storage type steam supply system, each heat storage tank 2 can realize the functions of heat storage and heat supply, and the plurality of heat storage tanks 2 can be distributed in a centralized manner or in a dispersed manner according to the different locations of the heat users 7.

[0075] In a specific implementation manner, in the heat storage steam supply system provided by the embodiment of the present invention, Figure 1 As shown, three operating modes can be realized:

[0076] The first mode is the heat storage mode, and the specific operation can be as follows: open the first stop valve 12 on the pipeline between the heat storage tank 2 and the gas-liquid heat exchanger 1, connect the pipeline between the gas-liquid heat exchanger 1 and the heat storage tank 2, start the exhaust fan, send the industrial waste heat into the gas-liquid heat exchanger 1, start the first heat transfer medium delivery pump 9, pump the low-temperature heat transfer medium from the heat storage tank 2 into the gas-liquid heat exchanger 1 to exchange heat with the industrial waste heat, and obtain the high-temperature heat transfer medium to flow back into the heat storage tank 2. The high-temperature heat transfer medium flowing back into the heat storage tank 2 is decelerated by the diversion mechanism 25, and then slowly flows from the top of the heat storage tank 2 to the bottom of the heat storage tank 2 as guided by the medium guide mechanism 24, and presses the low-temperature heat transfer medium in the heat storage tank 2 to the bottom of the heat storage tank 2.

[0077] The second mode is the heating mode, and the specific operation can be as follows: open the second stop valve 13 on the pipeline between the heat storage tank 2 and the heat exchanger 3, connect the pipelines connecting the heat storage tank 2, the heat exchanger 3 and the preheater 4, open the third stop valve 14 on the pipeline between the water tank 5 and the preheater 4, connect the pipelines connecting the water tank 5, the preheater 4 and the heat exchanger 3, start the second heat transfer medium delivery pump 10 and the circulating water pump 11, the heat transfer medium flows through the heat exchanger 3 to exchange heat with the high-temperature water, the temperature of the heat transfer medium drops, and then flows into the preheater 4 to exchange heat with water and then flows back to the bottom of the heat storage tank 2. The heat transfer medium flowing back to the heat storage tank 2 is decelerated by the diversion structure, and then flows from the bottom of the heat storage tank 2 to the top of the heat storage tank 2 along the "bow" direction through the drainage of the medium guide mechanism 24, and presses the high-temperature heat transfer medium in the heat storage tank 2 to the top of the heat storage tank 2. The water in the water tank 5 is heated by the preheater 4 and then flows through the heat exchanger 3 to exchange heat to generate steam to supply the heat user 7.

[0078] The third mode is a heat storage and heat supply mode, that is, the heat storage mode is turned on according to the first mode, and the heating mode is turned on according to the second mode. The specific operation can be as follows: open the first stop valve 12, connect the pipeline between the gas-liquid heat exchanger 1 and the heat storage tank 2, turn on the first heat transfer medium delivery pump 9, turn on the exhaust fan 8, and pump the low-temperature heat transfer medium from the bottom of the heat storage tank to the gas-liquid heat exchanger 1 for heat exchange to become a high-temperature transmission medium and flow back to the heat storage tank 2; open the second stop valve 13, connect the pipeline between the heat storage tank 2, the heat exchanger 3 and the preheater 4, and open the third stop valve 14. Valve 14 connects the pipelines between the water tank 5, the preheater 4, the heat exchanger 3 and the heat user 7, and starts the second heat transfer medium delivery pump 10 and the circulating water pump 11. The heat transfer medium flows through the heat exchanger 3 to exchange heat with the high-temperature water and cools down, then flows into the preheater 4 to exchange heat with water and flows back to the bottom of the heat storage tank 2. The heat transfer medium flowing back to the bottom of the heat storage tank 2 is decelerated by the diversion mechanism 25, and then flows from the bottom of the heat storage tank 2 to the top of the heat storage tank 2 through the baffle. The softened water is heated in the preheater 4, flows through the heat exchanger 3, and generates steam through heat exchange with the exchange medium to supply the heat user 7.

[0079] In the third mode, specifically, the flow direction of the heat transfer medium in the heat storage tank 2 ultimately depends on the size of the flow rate of the heat transfer medium during heat storage and the flow rate of the heat transfer medium during heat supply. For example, when the flow rate of the heat transfer medium flowing in from the second medium inlet during heat storage is equal to the flow rate of the heat transfer medium flowing out from the third medium outlet during heat supply, since the second medium inlet and the third medium outlet are both located at the top of the heat storage tank 2, the flow rate of the heat transfer medium during heat storage can be offset by the flow rate of the heat transfer medium during heat supply, and the heat transfer medium in the heat storage tank 2 does not flow; and when the heat storage When the flow rate of the heat transfer medium during heat storage is greater than the flow rate of the heat transfer medium during heat supply, a part of the flow rate of the heat transfer medium during heat storage is offset by the flow rate of the heat transfer medium during heat supply, and finally the flow direction of the heat transfer medium in the heat storage tank 2 is from the top of the heat storage tank 2 to the bottom of the heat storage tank 2; and when the flow rate of the heat transfer medium during heat storage is less than the flow rate of the heat transfer medium during heat supply, a part of the flow rate of the heat transfer medium during heat supply is offset by the flow rate of the heat transfer medium during heat storage, and finally the flow direction of the heat transfer medium in the heat storage tank 2 is from the bottom of the heat storage tank 2 to the top of the heat storage tank 2.

[0080] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A heat storage steam supply system, characterized in that: It includes a gas-liquid heat exchanger, a heat storage tank, a heat exchanger, a preheater and a water tank; among which, The gas-liquid heat exchanger includes a waste heat gas inlet, a waste heat gas outlet, a first medium inlet and a first medium outlet, the heat storage tank includes a second medium inlet, a second medium outlet, a third medium inlet and a third medium outlet, the heat exchanger includes a fourth medium inlet, a fourth medium outlet, a liquid inlet and a steam outlet, and the preheater includes a fifth medium inlet, a fifth medium outlet, a water inlet and a water outlet; The waste heat gas inlet is connected to the industrial high-temperature exhaust port through a pipeline, the waste heat gas outlet is used to discharge industrial exhaust gas, the first medium inlet is connected to the second medium outlet through a pipeline, and the first medium outlet is connected to the second medium inlet through a pipeline, so as to recover and store industrial waste heat through the heat transfer medium flowing through the gas-liquid heat exchanger and the heat storage tank; The third medium outlet is connected to the fourth medium inlet through a pipeline, the fourth medium outlet is connected to the fifth medium inlet through a pipeline, the fifth medium outlet is connected to the third medium inlet through a pipeline, the water tank is connected to the water inlet through a pipeline, the water outlet is connected to the liquid inlet through a pipeline, and the steam outlet is connected to the pipeline of the heat user, so that the heat stored in the heat storage tank is supplied to the heat user through the heat transfer medium flowing through the heat exchanger and the preheater; The heat storage tank comprises a shell, a heat storage medium and a medium guide mechanism, wherein the heat storage medium is located inside the shell, and the material of the heat storage medium is the same as the material of the heat transfer medium, and the medium guide mechanism is located between the top of the shell and the bottom of the shell, so as to guide the heat storage medium to flow in one direction along the arrangement direction of the top of the shell and the bottom of the shell; The medium guide mechanism includes a plurality of first baffles and a plurality of second baffles which are staggered and arranged in parallel along a direction from the top of the shell to the bottom of the shell; wherein, There is a gap between adjacent first baffles and second baffles; The first baffle has two mutually parallel side edges, both of which have a first gap with the side wall of the shell, and the other edge portions of the first baffle except the two side edges are sealed and connected to the side wall of the shell; The edge of the second baffle is sealed to the side wall of the housing, and the middle area of ​​the second baffle has a second gap arranged parallel to the two side edges of the first baffle; The shell comprises an inner shell, a heat-insulating layer and an outer shell which are sequentially arranged in a direction from the inside of the shell to the outside, and the heat-insulating layer is used to ensure the heat storage function of the heat storage tank.

2. The thermal storage steam supply system according to claim 1, characterized in that: The material of the heat transfer medium is heat transfer oil or molten salt.

3. The thermal storage steam supply system according to claim 2, characterized in that: When the material of the heat transfer medium is molten salt, the heat transfer medium is a mixed molten salt composed of at least one material selected from the group consisting of NaNO3, KNO3, NaNO2, Ca(NO3)2, and LiNO3.

4. The thermal storage steam supply system according to claim 3, characterized in that: The melting point of the heat transfer medium is lower than 100°C, and the decomposition temperature of the heat transfer medium is higher than 500°C.

5. The thermal storage steam supply system according to claim 1, characterized in that: An exhaust fan is arranged in the pipeline between the waste heat gas inlet and the industrial high-temperature exhaust port; a first heat transfer medium delivery pump is arranged on the pipeline between the second medium outlet and the first medium inlet; a second heat transfer medium delivery pump is arranged on the pipeline between the third medium outlet and the fourth medium inlet; a circulating water pump is arranged on the pipeline connecting the water tank and the water inlet.

6. The thermal storage steam supply system according to claim 5, characterized in that: A first stop valve is arranged on the pipeline between the second medium outlet and the first medium inlet; a second stop valve is arranged on the pipeline between the third medium outlet and the fourth medium inlet; and a third stop valve is arranged on the pipeline between the water tank and the water inlet.

7. The thermal storage steam supply system according to claim 1, characterized in that: The heat storage tank comprises a first liquid inlet pipe, a second liquid inlet pipe, a first liquid outlet pipe, and a second liquid outlet pipe; The first liquid inlet pipe and the second liquid outlet pipe are arranged at the top of the shell, the first liquid outlet pipe and the second liquid inlet pipe are arranged at the bottom of the shell, and the ports of the first liquid inlet pipe, the second liquid inlet pipe, the first liquid outlet pipe and the second liquid outlet pipe located outside the shell are respectively the second medium inlet, the third medium inlet, the second medium outlet and the third medium outlet; The liquid level of the heat storage medium submerges ports of the first liquid inlet pipe and the second liquid outlet pipe located in the shell.

8. The thermal storage steam supply system according to claim 1, characterized in that: The material of the medium guide mechanism is at least one of carbon steel, stainless steel, glass fiber reinforced plastic, red copper, brass, ceramics and polytetrafluoroplastics.

9. The thermal storage steam supply system according to claim 7, characterized in that: The heat storage tank further includes a flow dividing mechanism, and the ports of the first liquid inlet pipe, the second liquid inlet pipe, the first liquid outlet pipe, and the second liquid outlet pipe located inside the shell are all connected to the flow dividing mechanism; The flow dividing mechanism is in a plate shape, a cylindrical shape or a spherical shape, and is provided with a plurality of evenly distributed through holes.

Images