Normal pressure fixed bed coal gas producer coal gas waste heat recovery device

Abstract

The application discloses a kind of atmospheric fixed bed coal gas producer coal gas waste heat recovery device, including coal gas producer body, coal gas heat exchanger, air heat exchanger, mixed temperature device and circulating water tank;Coal gas heat exchanger includes coal gas heat exchange cylinder, heat exchange jacket and heat exchange ring pipe assembly, heat exchange jacket is located at the outer peripheral side of coal gas heat exchange cylinder, and heat exchange ring pipe assembly is located in coal gas heat exchange cylinder;Air heat exchanger includes air heat exchange cylinder and the heat exchange finned tube assembly installed in air heat exchange cylinder;Coal gas heat exchange cylinder is installed on the body of coal gas producer;Air heat exchange cylinder is connected with the air inlet end of the body of coal gas producer;Heat exchange jacket and heat exchange ring pipe assembly are connected with one end of heat exchange finned tube assembly by mixed temperature device;The other end of heat exchange finned tube assembly is connected with heat exchange jacket and heat exchange ring pipe assembly respectively by circulating water tank.The application can solve the problem of energy waste, improve gasification reaction efficiency and improve the calorific value of coal gas.

Description

Technical Field

[0001] This invention relates to the field of gasifier equipment technology, and in particular to a waste heat recovery device for an atmospheric pressure fixed-bed gasifier. Background Technology

[0002] An atmospheric pressure fixed-bed gasifier uses qualified anthracite as raw material and a mixture of air and steam as the gasifying agent to produce gas through an oxidation-reduction reaction. During the high-temperature gas washing and cooling process with circulating water, a large amount of waste heat is carried away by the circulating water, resulting in energy waste. Furthermore, the operation of the gas desulfurization system and the blending of coal briquettes in the gasifier reduce the calorific value of the gas, affecting the efficiency of the gasification reaction. To overcome the shortcomings of the existing technology, a waste heat recovery device for atmospheric pressure fixed-bed gasifiers needs to be designed. Through energy waste heat recovery and conversion, the reaction temperature can be increased, achieving the goal of both solving the heat loss problem and improving the calorific value of the gas. Summary of the Invention

[0003] This invention provides a waste heat recovery device for a fixed-bed gasifier at atmospheric pressure. It uses a gas heat exchanger to recover waste heat and an air heat exchanger to release waste heat. By circulating heat absorption and release, it can solve the problem of energy waste, heat the air transport temperature, improve the gasification reaction efficiency, increase the calorific value of the gas, and meet production needs.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A waste heat recovery device for a fixed-bed gasifier at atmospheric pressure includes a gasifier body, a gas heat exchanger, an air heat exchanger, a mixer, and a circulating water tank. The gas heat exchanger includes a gas heat exchange cylinder, a heat exchange jacket, and a heat exchange loop assembly. The heat exchange jacket is located on the outer periphery of the gas heat exchange cylinder, and the heat exchange loop assembly is located inside the gas heat exchange cylinder. The air heat exchanger includes an air heat exchange cylinder and a heat exchange finned tube assembly installed inside the air heat exchange cylinder. The gas heat exchange cylinder is connected to the gas outlet end of the gasifier body; the air heat exchange cylinder is connected to the air inlet end of the gasifier body; the heat exchange jacket and the heat exchange loop assembly are each connected to one end of the heat exchange finned tube assembly via the mixer; the other end of the heat exchange finned tube assembly is connected to the heat exchange jacket and the heat exchange loop assembly via the circulating water tank.

[0006] Furthermore, a gas channel is provided inside the gas heat exchange cylinder, one end of which is connected to the gas outlet end of the gas generator body; a heat exchange jacket is provided on the outer periphery of the gas heat exchange cylinder to form an annular cavity structure, and the heat exchange jacket is provided with a jacket outlet and a jacket inlet; the heat exchange ring tube assembly is fixedly connected to the inner wall periphery of the gas heat exchange cylinder by several fixing blocks; the heat exchange ring tube assembly is provided with a heat exchange tube outlet and a heat exchange tube inlet; both the jacket outlet and the heat exchange tube outlet are connected to the mixer; both the jacket inlet and the heat exchange tube inlet are connected to one end of the circulating water tank.

[0007] Furthermore, a plurality of heat-conducting plates are fixedly connected inside the heat exchange jacket, and the plurality of heat-conducting plates are spaced apart along the axis of the heat exchange jacket, with each heat-conducting plate surrounding the outer periphery of the gas heat exchange cylinder.

[0008] Furthermore, the heat exchange loop assembly includes a plurality of heat exchange tubes and two connecting tubes; the two connecting tubes are arranged at intervals, and the plurality of heat exchange tubes are arranged at intervals between the two connecting tubes; one end of each heat exchange tube is connected to one of the connecting tubes, and the other end of each heat exchange tube is connected to the other connecting tube; the heat exchange tube outlet is provided on one of the connecting tubes, and the heat exchange tube outlet is provided on the other connecting tube; the periphery of each connecting tube is fixedly connected to the periphery of the inner wall of the gas heat exchange cylinder by a plurality of fixing blocks.

[0009] Furthermore, the two connecting pipes are in a ring structure and are arranged coaxially at intervals; a plurality of heat exchange pipes are correspondingly arranged at intervals around the axes of the two connecting pipes to form a cylindrical structure.

[0010] Furthermore, the mixer includes a mixer body, two inlet pipes and one outlet pipe; the mixer body has a cavity structure inside, and the two inlet pipes and the outlet pipe are sealed and fixedly connected to the mixer body, and the two inlet pipes and the outlet pipe are respectively connected to the cavity structure.

[0011] Furthermore, the heat exchange finned tube assembly includes a heat exchange cavity and a plurality of finned tubes; the finned tubes are provided with spiral fins on their periphery; each finned tube is axially continuous to form an air channel; a sealed cavity structure is provided in the middle of the air heat exchange cylinder to form the heat exchange cavity, and the plurality of finned tubes are arranged at intervals in the heat exchange cavity along a direction parallel to the axis of the air heat exchange cylinder, with both ends of each finned tube extending outside the heat exchange cavity; a hot water outlet is provided on one side of the heat exchange cavity, and a hot water inlet is provided on the other side of the heat exchange cavity; the hot water inlet is connected to the outlet pipe in the mixer; and the hot water outlet is connected to the circulating water tank.

[0012] The beneficial effects of this invention are:

[0013] 1) This invention uses a gas heat exchanger to recover waste heat and an air heat exchanger to release waste heat. By circulating heat absorption and release, it can not only solve the problem of energy waste, but also heat the air transport temperature, improve the gasification reaction efficiency, increase the calorific value of the gas, and meet production needs.

[0014] 2) The heat exchange jacket is arranged on the inner wall of the gas heat exchange cylinder. When the gas passes through, it exchanges heat with the inner wall of the gas heat exchange cylinder. The heat exchange ring tube assembly is located inside the gas heat exchange cylinder, which can increase the contact area with the gas and exchange heat with the high-temperature gas more fully, thereby improving the heat exchange efficiency.

[0015] 3) The heat-conducting plate can increase the contact area between the heat exchange jacket and the softened water, thereby improving the heat exchange efficiency;

[0016] 4) The spiral fins can increase the contact area between the finned tube and the softened water, so that the temperature of the finned tube can rise rapidly. Air passing through the finned tube can be heated quickly, improving the heat release efficiency. This allows the air to have a higher initial temperature after leaving the air heat exchange cylinder, thereby improving the gasification reaction efficiency in the gasifier body and increasing the calorific value of the gas. Attached Figure Description

[0017] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, wherein:

[0018] Figure 1 This is a schematic diagram of the structure of the present invention;

[0019] Figure 2 This is a cross-sectional view of the gas heat exchanger of the present invention;

[0020] Figure 3 for Figure 2 Cross-sectional view at point AA;

[0021] Figure 4 This is a schematic diagram of the structure of the mixer in this invention;

[0022] Figure 5 This is a schematic diagram of the air heat exchanger in this invention;

[0023] Figure 6 This is a schematic diagram of the structure of the finned tube in this invention;

[0024] Attached image labels:

[0025] 1—Gas generator body; 2—Gas heat exchanger;

[0026] 3—Air heat exchanger, 4—Mixer,

[0027] 5—Circulating water tank; 21—Gas heat exchanger body;

[0028] 22—Heat exchange jacket; 23—Heat exchange loop assembly;

[0029] 24—Fixed block, 31—Air heat exchanger body,

[0030] 32—Heat exchanger finned tube assembly; 41—Mixer body;

[0031] 42—Inlet pipe, 43—Outlet pipe

[0032] 51—Water tank, 52—Water pump

[0033] 221—Jacket outlet, 222—Jacket inlet

[0034] 231—Heat exchanger tube outlet, 232—Heat exchanger tube inlet.

[0035] 233—Heat exchange tube, 234—Connecting tube,

[0036] 321—Heat exchange cavity; 322—Finned tube;

[0037] 3221—Helical fin, 3211—Hot water outlet,

[0038] 3212—Hot water inlet, 223—Heat conduction plate,

[0039] 311—Air inlet, 312—Air outlet. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0041] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a central component. When a component is described as "connected to" another component, it can be directly connected to the other component or may have a central component. When a component is described as "set on" another component, it can be directly set on the other component or may have a central component. When a component is described as "set in the middle," it is not simply set in the exact center, as long as it is not set within the area defined by both ends being in the middle. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0043] Reference Figures 1 to 6As shown, a waste heat recovery device for a fixed-bed gasifier at atmospheric pressure includes a gasifier body 1, a gas heat exchanger 2, an air heat exchanger 3, a mixer 4, and a circulating water tank 5. The gas heat exchanger 2 includes a gas heat exchange cylinder 21, a heat exchange jacket 22, and a heat exchange loop assembly 23. The heat exchange jacket 22 is located on the outer periphery of the gas heat exchange cylinder 21, and the heat exchange loop assembly 23 is located inside the gas heat exchange cylinder 21. The air heat exchanger 3 includes an air heat exchange cylinder 31 and a heating element installed on the air heat exchange cylinder 21. The heat exchange finned tube assembly 32 is located inside the heat exchange cylinder 31; the gas heat exchange cylinder 21 is connected to the gas outlet end of the gas generator body 1; the air heat exchange cylinder 31 is connected to the air inlet end of the gas generator body 1; the heat exchange jacket 22 and the heat exchange ring tube assembly 23 are both connected to one end of the heat exchange finned tube assembly 32 through the mixer 4; the other end of the heat exchange finned tube assembly 32 is connected to the heat exchange jacket 22 and the heat exchange ring tube assembly 23 through the circulating water tank 5 respectively. Specifically, the circulating water tank 5 includes a water tank 51 and a water pump 52. The water tank 51 is used to store the heat transfer medium, which can be softened water. The water pump 52 is used to transport the softened water into the heat exchange jacket 22 and the heat exchange loop assembly 23, and then collect it from the heat exchange jacket 22 and the heat exchange loop assembly 23 into the mixer 4 for mixing. After flowing through the heat exchange finned tube assembly 32, it returns to the water tank to form a recycling cycle. One end of the gas heat exchanger 2 is installed on the gas outlet end, and the other end is connected to an external pipeline. The heat exchange jacket 22 is arranged on the inner wall of the gas heat exchange cylinder 21. When the gas passes through, it exchanges heat with the inner wall of the gas heat exchange cylinder 21. The heat exchange loop assembly 23 is located inside the gas heat exchange cylinder 21, which can increase the contact area with the gas and more fully exchange heat with the high-temperature gas, thereby improving the heat exchange efficiency. Due to the different contact areas, the heat in the heat exchange jacket 22 and the heat exchange ring tube assembly 23 is uneven. The mixer is used to mix the two uneven streams of softened water, so that the temperature of the softened water delivered to the heat exchange finned tube assembly 32 is uniform. One end of the air heat exchanger 3 is installed at the air inlet end of the gasifier body 1. External air enters from the air heat exchange cylinder 31 and is heated by the heat exchange finned tube assembly 32 as it flows through it, which can increase the temperature of the air entering the gasifier 1. At the same time, this heat exchange process can remove the heat from the softened water in the heat exchange finned tube assembly 32, so that the softened water returning to the water tank is cooled, realizing the function of waste heat release. This invention uses a gas heat exchanger 2 to realize waste heat recovery and an air heat exchanger 3 to realize waste heat release, circulating heat absorption and release, which can not only solve the problem of energy waste, but also improve the gasification reaction efficiency, increase the calorific value of the gas, and meet production needs.

[0044] Please refer to Figure 2 and Figure 3As shown, a gas channel is provided inside the gas heat exchange cylinder 21, and one end of the gas channel is connected to the gas outlet end of the gas generator body 1; the heat exchange jacket 22 is provided on the outer periphery of the gas heat exchange cylinder 21 to form an annular cavity structure, and the heat exchange jacket 22 is provided with a jacket outlet 221 and a jacket inlet 222; the heat exchange ring tube assembly 23 is fixedly connected to the inner wall of the gas heat exchange cylinder 1 by several fixing blocks 24; the heat exchange ring tube assembly 23 is provided with a heat exchange tube outlet 231 and a heat exchange tube inlet 232; both the jacket outlet 221 and the heat exchange tube outlet 231 are connected to the mixer 4; both the jacket inlet 222 and the heat exchange tube inlet 232 are connected to one end of the circulating water tank 5. One end of the circulating water tank 5 is divided into two pipes via a T-junction: one pipe leads to the jacket inlet 222, and the other leads to the heat exchange tube inlet 232. Several heat-conducting plates 223 are fixedly connected inside the heat exchange jacket 22. These plates are spaced apart along the axis of the jacket, and each plate surrounds the outer periphery of the gas heat exchange cylinder 21. The heat-conducting plates 223 increase the contact area between the heat exchange jacket 22 and the softened water, thereby improving heat exchange efficiency.

[0045] Please refer to again Figure 2 and Figure 3 As shown, the heat exchanger ring assembly 23 includes a plurality of heat exchanger tubes 233 and two connecting tubes 234; the two connecting tubes 234 are arranged at intervals, and the plurality of heat exchanger tubes 233 are arranged at intervals between the two connecting tubes 234; one end of each heat exchanger tube 233 is connected to one of the connecting tubes 234, and the other end of each heat exchanger tube 233 is connected to the other connecting tube 234; the heat exchanger tube outlet 231 is provided on one of the connecting tubes 234, and the heat exchanger tube outlet 232 is provided on the other connecting tube 234; the periphery of each connecting tube 234 is fixedly connected to the inner wall of the gas heat exchange cylinder 1 by a plurality of fixing blocks 24. The two connecting tubes 234 are in a ring structure and are arranged coaxially at intervals; the plurality of heat exchanger tubes 233 are correspondingly arranged around the axis of the two connecting tubes 234 at intervals to form a cylindrical structure. The heat exchanger ring assembly 23 is cylindrical in shape. The heat exchanger tube outlet 231 and heat exchanger tube inlet 232 on the heat exchanger ring assembly extend through the heat exchanger jacket 22 to the outside of the gas heat exchanger cylinder. Several heat exchanger tubes 233 and connecting tubes 234 are fixed by welding, and the connection is required to be well sealed. The connecting tubes 234, fixing blocks 24 and gas heat exchanger cylinder 21 are also fixed by welding. The fixing blocks 24 are evenly distributed around the connecting tubes 234. One end of each fixing block 24 is welded to the connecting tube 234, and the other end of each fixing block 24 is welded to the inner wall of the gas heat exchanger cylinder 21. Similarly, the heat exchanger jacket 22 is sealed and welded to the gas heat exchanger cylinder 1.

[0046] Please refer to Figure 4 As shown, the mixer 4 includes a mixer body 41, two inlet pipes 42, and one outlet pipe 43. The mixer body 41 has an internal cavity structure. The two inlet pipes 42 and the outlet pipe 43 are all sealed and fixedly connected to the mixer body 41, and the two inlet pipes 42 and the outlet pipe 43 are respectively connected to the cavity structure. The two inlet pipes 42 and the outlet pipe 43 are all welded and fixed to the mixer body 41.

[0047] Please refer to Figure 5 and Figure 6 As shown, the heat exchange finned tube assembly 32 includes a heat exchange cavity 321 and a plurality of finned tubes 322; the finned tubes 322 are provided with spiral fins 3221 on their periphery; each finned tube 322 is formed by a through-flow along the axis; the air heat exchange cylinder 31 is provided with a sealed cavity structure in the middle to form the heat exchange cavity 321, and the plurality of finned tubes 322 are arranged at intervals in the heat exchange cavity 321 along a direction parallel to the axis of the air heat exchange cylinder 1, with both ends of each finned tube 322 extending to the outside of the heat exchange cavity 321; a hot water outlet 3211 is provided on one side of the heat exchange cavity 321, and a hot water inlet 3212 is provided on the other side of the heat exchange cavity 321; the hot water inlet 3212 is connected to the water outlet pipe 43 in the mixer 4; the hot water outlet 3211 is connected to the circulating water tank 5. Specifically, one end of the air heat exchange cylinder 31 is an air inlet 311, and the other end is an air outlet 312. The spiral fins 3221 on the periphery of the finned tube are used to increase the contact area with softened water, so that the temperature of the finned tube 322 rises rapidly. Air enters from the air inlet of the air heat exchange cylinder 31 and flows through the finned tube 322 to the air outlet. It is heated when flowing through the finned tube 322, so that the air temperature rises and the air leaves the air heat exchange cylinder 31 with a higher initial temperature, thereby improving the gasification reaction efficiency in the gasifier body 1 and increasing the calorific value of the gas.

[0048] The installation principle and mechanism of the water pump body 52 and water tank 51 in the circulating water tank 5 have been disclosed in the prior art and will not be repeated here.

[0049] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of the technical solutions of the present invention.

Claims

1. A waste heat recovery device for a fixed-bed gasifier at atmospheric pressure, characterized in that, The system includes a gasifier body, a gas heat exchanger, an air heat exchanger, a mixer, and a circulating water tank. The gas heat exchanger comprises a gas heat exchange cylinder, a heat exchange jacket, and a heat exchange loop assembly. The heat exchange jacket is located on the outer periphery of the gas heat exchange cylinder, and the heat exchange loop assembly is located inside the gas heat exchange cylinder. The air heat exchanger includes an air heat exchange cylinder and a heat exchange finned tube assembly installed inside the air heat exchange cylinder. The gas heat exchange cylinder is connected to the gas outlet end of the gasifier body. The air heat exchange cylinder is also connected to the air inlet end of the gasifier body. Both the heat exchange jacket and the heat exchange loop assembly are connected to one end of the heat exchange finned tube assembly via the mixer. The other end of the heat exchange finned tube assembly is connected to both the heat exchange jacket and the heat exchange loop assembly via the circulating water tank. The gas heat exchange cylinder is provided with a gas channel, one end of which is connected to the gas outlet end of the gas generator body; the heat exchange jacket is provided on the outer periphery of the gas heat exchange cylinder to form an annular cavity structure, and the heat exchange jacket is provided with a jacket outlet and a jacket inlet; the heat exchange ring tube assembly is fixedly connected to the inner wall periphery of the gas heat exchange cylinder by several fixing blocks; the heat exchange ring tube assembly is provided with a heat exchange tube outlet and a heat exchange tube inlet; both the jacket outlet and the heat exchange tube outlet are connected to the mixer; both the jacket inlet and the heat exchange tube inlet are connected to one end of the circulating water tank. A plurality of heat-conducting plates are fixedly connected inside the heat exchange jacket. The plurality of heat-conducting plates are spaced apart along the axis of the heat exchange jacket, and each heat-conducting plate surrounds the outer periphery of the gas heat exchange cylinder. The heat exchange loop assembly includes a plurality of heat exchange tubes and two connecting tubes; the two connecting tubes are arranged at intervals, and the plurality of heat exchange tubes are arranged at intervals between the two connecting tubes; one end of each heat exchange tube is connected to one of the connecting tubes, and the other end of each heat exchange tube is connected to the other connecting tube; the heat exchange tube outlet is located on one of the connecting tubes, and the heat exchange tube outlet is located on the other connecting tube; the periphery of each connecting tube is fixedly connected to the periphery of the inner wall of the gas heat exchange cylinder by a plurality of fixing blocks. The two connecting pipes are arranged in a ring shape and are coaxially spaced apart; a plurality of heat exchange pipes are arranged in a cylindrical shape and are spaced around the axis of the two connecting pipes.

2. The waste heat recovery device for a fixed-bed gasifier under atmospheric pressure according to claim 1, characterized in that, The mixer includes a mixer body, two inlet pipes and one outlet pipe; the mixer body has a cavity structure inside, and the two inlet pipes and the outlet pipe are sealed and fixedly connected to the mixer body, and the two inlet pipes and the outlet pipe are respectively connected to the cavity structure.

3. The waste heat recovery device for a fixed-bed gasifier under atmospheric pressure according to claim 1, characterized in that, The heat exchange finned tube assembly includes a heat exchange cavity and a plurality of finned tubes; the finned tubes are provided with spiral fins on their periphery; each finned tube is axially continuous to form an air channel; a sealed cavity structure is provided in the middle of the air heat exchange cylinder to form the heat exchange cavity, and the plurality of finned tubes are arranged at intervals in the heat exchange cavity along a direction parallel to the axis of the air heat exchange cylinder, with both ends of each finned tube extending outside the heat exchange cavity; a hot water outlet is provided on one side of the heat exchange cavity, and a hot water inlet is provided on the other side of the heat exchange cavity; the hot water inlet is connected to the outlet pipe in the mixer; the hot water outlet is connected to the circulating water tank.

Images