Electric heating energy storage type steam generator

Abstract

The invention discloses an electric heating energy storage type steam generator, and belongs to the technical field of industrial steam supply. According to the invention, the problems of high pollutant emission and high traditional energy consumption in the existing mode of generating industrial steam through a traditional coal-fired, gas-fired or oil-fired boiler are solved. The invention discloses a steam generator, which comprises a steam generator main body, an air duct, a circulating fan and a solid heat storage brick, the steam generator main body comprises a shell, a steam pocket positioned above the shell, and a coal economizer, an evaporation tube bundle and a superheater which are positioned in the shell, the circulating fan and the solid heat storage brick are arranged in the air duct, and two ends of the air duct are respectively communicated with two ends of the shell; a circulation loop is formed. The electric heating energy storage type steam generator utilizes electric energy to generate superheated steam, the requirement for high parameters of industrial steam can be met, electrified industrial steam supply is achieved, and compared with a traditional boiler, the electric heating energy storage type steam generator is low-carbon, environmentally friendly and higher in response speed.

Description

Technical Field

[0001] The invention relates to an electric heating energy storage type steam generator, belonging to the technical field of industrial steam supply. Background Art

[0002] In recent years, the installed capacity of new energy power such as wind power and photovoltaics in my country has continued to grow rapidly, providing us with a large amount of clean electricity. However, the instability and randomness of new energy power generation output have also brought huge challenges to the safe operation of the power system and power supply security. Therefore, how to make full use of the electricity during the valley period of the power grid, absorb new energy, and reduce carbon emissions is an important route for energy development.

[0003] At present, industrial steam is mainly produced by traditional coal-fired, gas-fired or oil-fired boilers, which have pollutant emission problems. Reducing the consumption of traditional energy, improving national energy security, and realizing the electrification of industrial systems are the development directions of national energy. Therefore, there is an urgent need for a way to replace traditional energy to produce industrial steam to reduce pollutant emissions. Summary of the invention

[0004] The present invention is to solve the above technical problems and further provides an electric heating energy storage type steam generator.

[0005] The technical solution adopted by the present invention to solve the above technical problems is:

[0006] An electrically heated energy storage steam generator comprises a steam generator body, an air duct, a circulating fan and solid heat storage bricks, wherein the steam generator body comprises a shell, a steam drum located above the shell, and an economizer, an evaporator tube bundle and a superheater located inside the shell, the circulating fan and the solid heat storage bricks are arranged in the air duct, and the two ends of the air duct are respectively connected with the two ends of the shell to form a circulation loop, the economizer, the evaporator tube bundle and the superheater are arranged vertically, the outlet of the economizer is connected to the first inlet of the steam drum, the first outlet of the steam drum is connected to the inlet of the evaporator tube bundle, the outlet of the evaporator tube bundle is connected to the second inlet of the steam drum, the second outlet of the steam drum is connected to the inlet of the superheater, water enters from the inlet of the economizer, and the superheated steam generated in the superheater is sent to the steam use end through the outlet of the superheater.

[0007] Furthermore, a supporting structure is provided at the bottom of the steam generator body.

[0008] Furthermore, the economizer is a serpentine tube spiral fin economizer.

[0009] Furthermore, a first inlet header is provided at the inlet of the economizer, and a first outlet header is provided at the outlet, and both ends of all the serpentine tubes in the economizer are respectively connected to the first inlet header and the first outlet header.

[0010] Furthermore, the inlet of the evaporation tube bundle is located at the bottom, and the outlet is located at the top.

[0011] Furthermore, multiple second inlet headers and multiple second outlet headers are correspondingly connected at both ends of the evaporator tube bundle, wherein three rows of evaporator tube bundles are connected between each second inlet header and its corresponding second outlet header, multiple second inlet headers are connected in parallel to the third inlet header, and the first outlet of the boiler drum is connected to the third inlet header through multiple second connecting pipes.

[0012] Furthermore, the number of circulating fans and solid heat storage bricks is two and they are arranged alternately in the air duct.

[0013] Furthermore, the circulating fan and the solid heat storage bricks are both located below the steam generator body.

[0014] Furthermore, the air duct includes a first air duct and two second air ducts, wherein the lower ends of the two second air ducts are connected to the two ends of the first air duct, and the upper ends of the two second air ducts are connected to the two ends of the shell, and the circulating fan and solid heat storage bricks are arranged in the first air duct.

[0015] Furthermore, baffles are provided at the corners of the air duct.

[0016] Compared with the prior art, the present invention has the following effects:

[0017] The electrically heated energy storage steam generator of the present invention utilizes electric energy to generate superheated steam, which can meet the high parameter requirements of industrial steam and realize electrified industrial steam supply. Compared with traditional boilers, the electrically heated energy storage steam generator of the present invention is low-carbon, environmentally friendly and has a faster response speed.

[0018] The electric heating energy storage type steam generator of the present invention, combined with the energy storage capacity of the solid heat storage brick, can absorb valley electricity from new energy sources.

[0019] Through electric energy conversion (i.e. solid heat storage bricks) and heat exchange equipment (i.e. economizers, evaporator tube bundles and superheaters), new energy green electricity is converted into heat to generate steam required for industrial production, thereby replacing oil, coal and gas boiler steam systems, reducing the use of fossil energy and lowering carbon emissions; at the same time, combined with energy storage, it can fully utilize wind energy, photovoltaic power and valley peak power, reducing the regulation pressure of the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the electric heating energy storage type steam generator of the present invention;

[0021] Figure 2 It is a schematic diagram of the connection structure between the steam drum and the evaporation tube bundle in the electrically heated energy storage steam generator of the present invention in the main view direction;

[0022] Figure 3 It is a schematic diagram of the connection structure between the steam drum and the evaporation tube bundle in the electrically heated energy storage steam generator of the present invention in a side view.

[0023] In the figure:

[0024] 11. Shell; 12. Steam drum; 13. Economizer; 14. Evaporation tube bundle; 15. Superheater; 16. Second inlet header; 17. Second outlet header; 18. Third inlet header; 19. Second connecting pipe; 2. Air duct; 3. Circulation fan; 4. Solid heat storage bricks; 5. Support structure. DETAILED DESCRIPTION

[0025] Specific implementation method 1: Combination Figure 1 to Figure 3 This embodiment is explained, and the technical scheme in the embodiment of the present invention is clearly and completely described. Obviously, the described embodiment is only a part of the embodiment of the present invention, rather than all the embodiments. Based on the embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0026] It should be noted that the descriptions of the present invention regarding directions such as "front", "back", "left", "right", "inside", "outside", "left side", "right side", "upper", "lower", "top", "bottom", etc. are all defined based on the relationship between the orientations or positions shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the structure must be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention. In the description of the present invention, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0027] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] An electrically heated energy storage steam generator comprises a steam generator body, an air duct 2, a circulating fan 3 and solid heat storage bricks 4, wherein the steam generator body comprises a shell 11, a steam drum 12 located above the shell 11, and an economizer 13, an evaporation tube bundle 14 and a superheater 15 located inside the shell 11; the circulating fan 3 and the solid heat storage bricks 4 are arranged in the air duct 2, and the two ends of the air duct 2 are respectively connected with the two ends of the shell 11 to form a circulation loop; the economizer 13, the evaporation tube bundle 14 and the superheater 15 are arranged vertically; the outlet of the economizer 13 is connected to the first inlet of the steam drum 12, the first outlet of the steam drum 12 is connected to the inlet of the evaporation tube bundle 14, the outlet of the evaporation tube bundle 14 is connected to the second inlet of the steam drum 12, the second outlet of the steam drum 12 is connected to the inlet of the superheater 15, water enters from the inlet of the economizer 13, and the superheated steam generated in the superheater 15 is sent to the steam use end through the outlet of the superheater 15.

[0029] The air circulates in the circulation loop formed by the air duct 2 and the housing 11.

[0030] The resistance wire in the solid heat storage brick 4 converts electrical energy into thermal energy. After the air is heated, it passes through the recirculation fan 3 to the shell 11 of the steam generator body, exchanges heat with the superheater 15, the evaporator tube bundle 14 and the economizer 13, and then returns to the solid heat storage brick 4 for reheating, and the cycle repeats; water passes through the economizer 13, the steam drum 12, the evaporator tube bundle 14 and the superheater 15 in turn, exchanges heat with the hot air in the shell 11, is heated to the rated parameter steam, and then is discharged and sent to the steam use end.

[0031] The specific structures of the economizer 13, the steam drum 12, the evaporation tube bundle 14 and the superheater 15 are all prior arts and will not be described in detail here.

[0032] The first inlet of the drum 12 is the liquid water inlet, the first outlet of the drum 12 is the liquid water outlet, the second inlet of the drum 12 is the steam-water mixture inlet, and the second outlet of the drum 12 is the steam outlet.

[0033] The combination of the steam drum 12 and the evaporation tube bundle 14 circulates continuously, water enters the lower part of the evaporation tube bundle 14 through the steam drum 12, and the outlet of the evaporation tube bundle 14 is a steam-water mixture, which is separated in the steam drum 12, and the separated water continues to enter the evaporation tube bundle 14 for circulation, and the steam is discharged from the second outlet of the steam drum 12 and enters the superheater 15. The steam drum 12 is used to provide circulation power for the natural circulation of the steam drum 12 and the evaporation tube bundle 14.

[0034] The evaporation tube bundle 14 adopts a vertical tube bundle structure. Along the hot air flow direction, each tube bundle can adapt to the change of the hot air heat load like a sponge. Due to the change of heat load, the outlet of the evaporation tube bundle 14 is a steam-water mixture with different working fluid dryness. The safety of water circulation can be effectively guaranteed in the tube bundle.

[0035] The steam drum 12 adopts single-stage evaporation. A cyclone separator (i.e., cyclone tube) with a guide plate is installed inside the steam drum 12 as a primary separation element. The steam-water mixture enters the cyclone tube through the grouping connecting box. Due to the centrifugal force, the separated water enters the water chamber through the guide blades, while the steam flows upward and enters the steam drum 12 effective separation chamber after passing through the top hat (trapezoidal corrugated plate separator). The top hat can make the steam outlet speed uniform and further separate the moisture carried by the steam. In order to eliminate the rotational movement of the cyclone separator drainage, the left-handed and right-handed cyclone separators are arranged in a staggered manner to keep the water level stable.

[0036] After the steam is naturally separated due to gravity in the steam space, it enters the flat-hole plate cleaning device and is cleaned with feed water. After cleaning, the steam is naturally separated again in the upper steam space, and then leads out of the steam drum 12 into the superheater 15 through the secondary separation element arranged on the top of the steam drum 12 - the porous plate and the steam equalization device. The function of the secondary separation element is to separate the fine water droplets carried in the steam and evenly lead the steam out of the steam drum 12.

[0037] Rated parameters are, for example: 3-9 MPa, 300-540°C.

[0038] The solid heat storage brick 4 utilizes new energy electricity (such as wind power) or valley electricity to heat to a high temperature above 800° C. for energy storage.

[0039] The feed water is heated by an economizer 13, recovering heat from the outgoing air.

[0040] The outlet pipe of the superheater 15 can be equipped with valves, measuring points and other accessories as needed.

[0041] The circulation fan 3 uses a variable frequency high temperature resistant fan, which can be applied to various operating conditions.

[0042] When the solid heat storage bricks 4 dissipate heat, the air becomes high-temperature air after passing through the high-temperature solid heat storage bricks 4 driven by the circulating fan 3. The high-temperature air passes through the superheater 15, evaporation tube bundle 14 and economizer 13 in the shell 11 for heat exchange, transfers the heat, and becomes low-temperature air again, and circulates back and forth. The water absorbs the heat of the hot air and outputs superheated steam. The high-temperature steam temperature can be output according to the temperature required by the user ±5℃.

[0043] The electrically heated energy storage steam generator of the present invention utilizes electric energy to generate superheated steam, which can meet the high parameter requirements of industrial steam and realize electrified industrial steam supply. Compared with traditional boilers, the electrically heated energy storage steam generator of the present invention is low-carbon, environmentally friendly and has a faster response speed.

[0044] The electric heating energy storage type steam generator of the present invention, in combination with the energy storage capacity of the solid heat storage brick 4, can absorb valley electricity of new energy.

[0045] By converting new energy into heat (i.e., solid heat storage bricks 4) and heat exchange equipment (i.e., economizer 13, evaporator tube bundle 14 and superheater 15), green electricity from new energy sources is converted into heat to generate steam required for industrial production, thereby replacing the boiler steam systems of oil, coal and gas, reducing the use of fossil energy and lowering carbon emissions; at the same time, combined with energy storage, it can fully utilize wind energy, photovoltaic power and valley peak power, reducing the regulation pressure of the power grid.

[0046] A support structure 5 is provided at the bottom of the steam generator body. In this design, the support structure 5 is made of carbon steel or alloy steel, which plays a role in supporting and fixing the steam generator body. The air duct 2 can also be supported by the support structure 5.

[0047] The economizer 13 is a serpentine tube spiral fin economizer.

[0048] The inlet of the economizer 13 is provided with a first inlet header, and the outlet is provided with a first outlet header. Both ends of all the serpentine tubes in the economizer 13 are respectively connected to the first inlet header and the first outlet header. The outlet water of the economizer 13 retains a certain degree of subcooling to avoid stagnation caused by bubbles in the serpentine tube. The first outlet header is connected to the inlet of the drum 12 through a first connecting pipe.

[0049] The inlet of the evaporation tube bundle 14 is located at the bottom, and the outlet is located at the top.

[0050] Multiple second inlet headers 16 and multiple second outlet headers 17 are correspondingly connected at both ends of the evaporation tube bundle 14, wherein three rows of evaporation tube bundles 14 are arranged in communication between each second inlet header 16 and its corresponding second outlet header 17, multiple second inlet headers 16 are connected in parallel to the third inlet header 18, and the first outlet of the drum 12 is connected to the third inlet header 18 via multiple second connecting pipes 19. In this design, by providing the third inlet header 18, the water drawn out of the drum 12 is better distributed to the evaporation tube bundle 14 for heat exchange.

[0051] There are two circulating fans 3 and two solid heat storage bricks 4, which are arranged in an alternating manner in the air duct 2. With such a design, the air temperature and wind speed are further increased through the alternating arrangement of the circulating fans 3 and the solid heat storage bricks 4, thereby improving the heat exchange efficiency.

[0052] The circulating fan 3 and the solid heat storage brick 4 are both located below the steam generator body.

[0053] The air duct 2 includes a first air duct and two second air ducts, wherein the lower ends of the two second air ducts are connected to the two ends of the first air duct, and the upper ends of the two second air ducts are connected to the two ends of the shell 11, and the circulating fan 3 and the solid heat storage brick 4 are arranged in the first air duct.

[0054] Baffles are provided at the corners of the air duct 2. In this design, the uniformity of the air flow field is ensured by providing baffles at the corners of the air duct 2.

[0055] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An electrically heated energy storage steam generator, characterized in that: The invention comprises a steam generator body, an air duct (2), a circulating fan (3) and solid heat storage bricks (4), wherein the steam generator body comprises a shell (11), a steam drum (12) located above the shell (11), and an economizer (13), an evaporation tube bundle (14) and a superheater (15) located inside the shell (11); the circulating fan (3) and the solid heat storage bricks (4) are arranged in the air duct (2); the two ends of the air duct (2) are respectively connected to the two ends of the shell (11) to form a circulation loop; the economizer (13), The evaporator tube bundle (14) and the superheater (15) are arranged vertically. The outlet of the economizer (13) is connected to the first inlet of the steam drum (12). The first outlet of the steam drum (12) is connected to the inlet of the evaporator tube bundle (14). The outlet of the evaporator tube bundle (14) is connected to the second inlet of the steam drum (12). The second outlet of the steam drum (12) is connected to the inlet of the superheater (15). Water enters from the inlet of the economizer (13). The superheated steam generated in the superheater (15) is sent to the steam use end through the outlet of the superheater (15).

2. The electrically heated energy storage steam generator according to claim 1, characterized in that: A supporting structure (5) is arranged at the bottom of the steam generator body.

3. The electrically heated energy storage steam generator according to claim 1, characterized in that: The economizer (13) is a serpentine tube spiral fin economizer.

4. The electrically heated energy storage steam generator according to claim 3, characterized in that: The inlet of the economizer (13) is provided with a first inlet header, and the outlet is provided with a first outlet header. Both ends of all serpentine tubes in the economizer (13) are respectively connected to the first inlet header and the first outlet header.

5. The electrically heated energy storage steam generator according to claim 1, characterized in that: The inlet of the evaporation tube bundle (14) is located at the bottom, and the outlet is located at the top.

6. The electrically heated energy storage steam generator according to claim 1, characterized in that: A plurality of second inlet headers (16) and a plurality of second outlet headers (17) are correspondingly connected to the two ends of the evaporation tube bundle (14), wherein three rows of evaporation tube bundles (14) are arranged in communication between each second inlet header (16) and its corresponding second outlet header (17), the plurality of second inlet headers (16) are connected in parallel to a third inlet header (18), and the first outlet of the steam drum (12) and the third inlet header (18) are connected via a plurality of second connecting pipes (19).

7. The electrically heated energy storage steam generator according to claim 1, characterized in that: The number of the circulating fans (3) and the number of the solid heat storage bricks (4) are both two and they are arranged in a staggered manner in the air duct (2).

8. The electrically heated energy storage steam generator according to claim 1, characterized in that: The circulating fan (3) and the solid heat storage brick (4) are both located below the steam generator body.

9. The electrically heated energy storage steam generator according to claim 1, characterized in that: The air duct (2) comprises a first air duct and two second air ducts, wherein the lower ends of the two second air ducts are connected to the two ends of the first air duct, and the upper ends of the two second air ducts are connected to the two ends of the shell (11), and the circulating fan (3) and the solid heat storage bricks (4) are arranged in the first air duct.

10. The electrically heated energy storage steam generator according to claim 1, characterized in that: A baffle is provided at the corner of the air duct (2).

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