Natural gas reforming hydrogen production tail gas waste heat recovery device and process

Abstract

The invention relates to the technical field of waste heat recovery, in particular to a natural gas reforming hydrogen production tail gas waste heat recovery device and technology.The natural gas reforming hydrogen production tail gas waste heat recovery device comprises a heat recovery module and two conveying modules, the heat recovery module can be used for tail gas waste heat recovery and comprises a connecting cylinder, and a plurality of conveying mechanisms are arranged in the connecting cylinder; and a plurality of communicating mechanisms corresponding to the conveying mechanisms are arranged in the connecting cylinder, each communicating mechanism comprises a fixing frame, and connecting grooves are formed in the side faces of the two ends of each fixing frame. According to the device, the blocking plates are arranged on the two sides of the fixing frame, the baffles in the fixing frame at the bottom can rotate, the blocking plates move, the interior of the fixing frame is separated through the baffles, and the interior of the fixing frame communicates with the interior of the conveying frame, so that cold water can be conveyed to the top and the bottom of the spiral channel at the same time, and tail gas can heat the cold water at the top to generate water vapor; and then the tail gas can be further cooled through bottom cold water, and sufficient recovery of tail gas waste heat is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of waste heat recovery, and in particular to a device and process for recovering waste heat from tail gas from hydrogen production from natural gas reforming. Background Art

[0002] Hydrogen energy has the advantages of low carbon, cleanliness, high specific energy density and high conversion efficiency. Hydrogen can be produced by water electrolysis, water-gas method, synthesis gas from petroleum thermal cracking and natural gas hydrogen production. Among them, natural gas reforming hydrogen production is a process of producing hydrogen by catalytic reaction of natural gas and water vapor at high temperature. Since the production process needs to be carried out at high temperature, the tail gas generated in the production process has a high temperature. In order to reduce energy consumption, a waste heat recovery device is usually configured to recover the heat of the tail gas. When the existing natural gas reforming hydrogen production tail gas waste heat recovery device is in use, after the tail gas heats the water in the recovery device to generate water vapor, since the water vapor also has a certain temperature, some heat in the tail gas is still not recovered, which is not conducive to the full recovery of the tail gas waste heat. Summary of the invention

[0003] The object of the present invention is to provide a device and process for recovering waste heat from tail gas from hydrogen production by reforming natural gas, so as to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A waste heat recovery device for tail gas from natural gas reforming to produce hydrogen, comprising a heat recovery module and two transport modules;

[0006] The heat recovery module can be used for exhaust waste heat recovery, the heat recovery module includes a connecting cylinder, a plurality of conveying mechanisms are arranged inside the connecting cylinder, and a plurality of connecting mechanisms are arranged inside the connecting cylinder corresponding to the conveying mechanisms, the connecting mechanism includes a fixed frame, the sides of both ends of the fixed frame are provided with connecting grooves, the inner side of the fixed frame is rotatably connected with a baffle, both sides of the fixed frame are provided with blocking plates, the connecting cylinder is fixedly connected with a conveying frame corresponding to the plurality of conveying mechanisms, and the inner side of the conveying frame is slidably connected with the side of the adjacent blocking plate, and the side of the conveying frame is provided with a plurality of opening grooves corresponding to the blocking plate;

[0007] Both conveying modules are arranged on the connecting tube, and the conveying module includes a conveying seat. The inner side surface of the connecting tube and the side surface of the fixed frame are fixedly connected to the side surface of the conveying seat. The inner side surface of the conveying seat is slidingly connected to the side surface of the adjacent blocking plate. The side surface of the conveying seat is provided with two opening grooves corresponding to the blocking plate.

[0008] Furthermore, the bottom surface of the connecting tube is fixedly connected to a plurality of support columns, the top surface of the connecting tube is connected to an air inlet pipe, the bottom side surface of the connecting tube is connected to an air outlet pipe, the top surface of the connecting tube is fixedly connected to a conveying box connected to the top of the conveying frame, and the side and top surfaces of the conveying box are both connected to connecting pipes.

[0009] Furthermore, the top and bottom of the inner side surface of the connecting cylinder are fixedly connected with connecting frames, the connecting frame located at the top is connected with the inside of the conveying frame, and the connecting frame located at the bottom is connected with the inside of an adjacent conveying seat, the two side surfaces of the baffle are fixedly connected with connecting rods passing through the inside of the adjacent blocking plates, the side surfaces of the connecting rods are fixedly connected with pushing rods, the bottom of the side surfaces of the pushing rods are rotatably connected with a round block, and the side surfaces of the blocking plates are provided with sliding grooves that are slidably connected with the side surfaces of the adjacent round blocks.

[0010] The top surface and the bottom surface of the conveying seat are both connected with a fixing tube, and the inner side surface of the conveying seat is fixedly connected to an adjusting frame which is rotatably connected to the side surfaces of several adjacent connecting rods, and the inner side surface of the adjusting frame is fixedly connected to a limit rod which is rotatably connected to the side surfaces of adjacent connecting rods, and a torsion spring 1 is arranged inside the limit rod, and the torsion spring 1 is located between the side surface of the connecting rod and the inner side surface of the limit rod, and a torsion spring 2 is arranged inside the support rod, and the torsion spring 2 is located between the connecting rod and the support rod, and the inner side surface of the support rod is provided with an arc groove, and one side surface of the connecting rod is fixedly connected to a limit block which is slidably connected to the inner side surface of the arc groove, and the inner side surface of the adjusting frame is slidably connected to the corresponding support rod with a sliding block, and the inner side surface of the adjusting frame is rotatably connected to an adjusting screw rod which is screwed together with the sliding block, and the side surface of the adjusting screw rod is rotatably connected to the inner side surface of the conveying seat.

[0011] Preferably, the conveying mechanism includes a spiral seat, a sliding plate, two screw-on cylinders, a grid plate, a plurality of fixed seats, and a plurality of return springs;

[0012] The spiral seat is fixedly connected to the inner side of the connecting tube, the inner side of the spiral seat is fixedly connected to the side of the conveying frame, the two sides of the fixing frame located on the long side are fixedly connected to the adjacent side of the spiral seat, and the side of the connecting frame is fixedly connected to the adjacent side of the spiral seat;

[0013] The sliding plate is slidably connected to the inner side of the spiral seat, and the side surfaces of the fixing frame and the connecting frame are both slidably connected to the side surfaces of the adjacent sliding plates;

[0014] The two screw-on cylinders are fixedly connected to the inner side surface of the sliding plate, and the side surface of the screw-on cylinder is slidably connected to the inner side surface of the bottom of the screw seat;

[0015] The grid plate is slidably connected to the inner side of the spiral seat;

[0016] A plurality of fixing seats are respectively fixedly connected to the inner bottom surface of the spiral seat, the top and bottom surfaces of the grid plate, and the bottom surface of the sliding plate;

[0017] A plurality of return springs are fixedly connected between two adjacent fixing seats.

[0018] Furthermore, a connecting plate is provided at the bottom of the connecting tube, a plurality of sliding rods are fixedly connected to the top surface of the connecting plate and are slidably connected to the inner side surface of the connecting tube, the inner side surface of the sliding plate and the inner side surface of the spiral seat are both slidably connected to the side surfaces of adjacent sliding rods, a plurality of fixing rings are fixedly connected to the side surfaces of adjacent sliding plates and are in contact with the top surfaces of adjacent sliding plates, a hydraulic rod is provided at the top of the connecting plate, the top end of the hydraulic rod is fixedly connected to the bottom surface of the connecting tube, and the output end of the hydraulic rod is transmission-connected to the top surface of the connecting plate.

[0019] Preferably, two adjustment seats are provided at the bottom of the connecting tube, and the inner side surfaces of the adjustment seats are rotatably connected to two screw-in rods, the side surfaces of the screw-in rods are provided with connecting threads that screw into the inner side surfaces of adjacent screw-in tubes, the side surfaces of the screw-in rods are slidably connected to a blocking ring that is slidably connected to the inner side surface of the connecting tube, the inner side surface of the adjustment seats is rotatably connected to a positioning screw rod, and the bottom surface of the connecting tube is fixedly connected to two positioning seats that screw into the side surfaces of the positioning screw rod.

[0020] The process for recovering waste heat from tail gas from natural gas reforming to produce hydrogen includes a waste heat recovery device for recovering waste heat from tail gas from natural gas reforming to produce hydrogen. The process specifically includes the steps of tail gas collection - tail gas pretreatment - waste heat recovery - tail gas purification. The specific steps are as follows:

[0021] Step (1) tail gas collection: collecting tail gas from the natural gas reforming hydrogen production process, collecting the tail gas and transporting it to a recovery pipeline network;

[0022] Step (2) tail gas pretreatment: transporting the tail gas to the pretreatment process through the recovery pipeline network to remove impurities and harmful substances in the tail gas to ensure that the tail gas will not cause damage to subsequent equipment;

[0023] Step (3) waste heat recovery: the pretreated tail gas is transported to a waste heat recovery device, and the waste heat of the tail gas is recovered by the waste heat recovery device, and water in the waste heat recovery device is heated to produce steam and hot water;

[0024] Step (4) exhaust gas purification: After heat recovery, the exhaust gas is further purified to further remove harmful substances in the exhaust gas to ensure that the exhaust gas emissions meet environmental protection standards.

[0025] Furthermore, in step (2), the tail gas pretreatment step, the tail gas is pretreated for desulfurization and denitrification.

[0026] Preferably, after the exhaust gas is purified in step (4), the exhaust gas is detected by a gas detection device, and the detection results are transmitted in real time to monitor whether the exhaust gas pollutant content meets the requirements.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. Through the baffles provided on both sides of the fixed frame, a number of conveying mechanisms and connecting mechanisms can form a quasi-spiral channel, water can be conveyed to the top of the spiral channel through the conveying frame, and exhaust gas can be conveyed to the connecting tube through the air inlet pipe. When water flows in the spiral channel, the exhaust gas can heat the water, and the baffle in the bottom fixed frame can be rotated, and the baffle can be moved. The inside of the fixed frame is separated by the baffle, and the fixed frame is connected with the inside of the conveying frame. In this way, cold water can be conveyed to the top and bottom of the spiral channel at the same time, and the exhaust gas can heat the top cold water to generate water vapor, and then the exhaust gas can be further cooled by the bottom cold water. The exhaust gas heats the bottom cold water to only generate hot water, thereby fully recovering the heat in the exhaust gas, which is beneficial to the full recovery of the waste heat of the exhaust gas.

[0029] 2. A sliding plate is connected by sliding on the inner side of the spiral seat. The return spring can support the sliding plate. The position of the sliding plate can be adjusted by the hydraulic rod so that the grid plate corresponds to the vicinity of the water surface. In this way, some space can be reserved in the spiral channel to increase the evaporation area of ​​the water surface and facilitate the flow of water vapor in the spiral channel. The grid plate is beneficial to increase the heat conduction contact area. At the same time, the position of the bottom sliding plate can be adjusted by the screwing rod so that the sliding plate contacts the water surface of the bottom cold water without reserving some space. In this way, in the process of producing hot water, the heat exchange contact area with the cold water is increased by the sliding plate, which is beneficial to the rapid cooling of the exhaust gas by the bottom cold water. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the overall structure of a waste heat recovery device for tail gas from hydrogen production by natural gas reforming according to the present invention;

[0031] Figure 2 It is a schematic diagram of the internal structure of the connecting tube in the present invention;

[0032] Figure 3 It is a schematic diagram of the structure of the conveying mechanism in the present invention;

[0033] Figure 4 It is a schematic diagram of the internal structure of the spiral seat in the present invention;

[0034] Figure 5 It is a schematic diagram of the internal structure of the conveying frame in the present invention;

[0035] Figure 6 It is a schematic diagram of the internal structure of the fixed frame in the present invention;

[0036] Figure 7 It is a schematic diagram of the internal structure of the limit rod in the present invention;

[0037] Figure 8 It is a schematic diagram of the internal structure of the arc groove in the present invention;

[0038] Fig. 9 It is a schematic diagram of the internal structure of the adjustment frame in the present invention;

[0039] Fig.10 It is a schematic diagram of the sliding rod structure in the present invention;

[0040] Fig.11 It is a schematic diagram of the connection plate structure in the present invention;

[0041] Fig.12 It is a schematic diagram of the structure of the adjustment seat in the present invention;

[0042] Fig.13 It is a schematic diagram of the recovery process in the present invention.

[0043] In the figure: 100, heat recovery module; 110, connecting tube; 111, air inlet pipe; 112, air outlet pipe; 113, support column; 120, conveying box; 121, connecting tube; 130, conveying frame; 131, opening slot 1; 140, conveying mechanism; 141, spiral seat; 142, sliding plate; 143, screw-on tube; 144, grid plate; 145, fixed seat; 146, reset spring; 150, connecting mechanism; 151, fixed frame; 152, connecting slot; 153, baffle; 154, connecting rod; 155, blocking plate; 156, pushing rod; 157, round block; 158. Sliding groove; 159. Limiting block; 160. Connecting frame; 170. Connecting plate; 171. Hydraulic rod; 172. Sliding rod; 173. Fixed ring; 180. Adjusting seat; 181. Screw-on rod; 182. Positioning screw rod; 183. Blocking ring; 190. Positioning seat; 200. Conveying module; 210. Conveying seat; 211. Fixed tube; 212. Opening groove II; 220. Adjusting frame; 221. Adjusting screw rod; 222. Sliding block; 230. Limiting rod; 231. Support rod; 232. Torsion spring I; 233. Torsion spring II; 234. Arc groove. DETAILED DESCRIPTION

[0044] 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.

[0045] See also Figure 1-6In an embodiment of the present invention, a waste heat recovery device for tail gas from hydrogen production by natural gas reforming includes a heat recovery module 100 and two transport modules 200;

[0046] The heat recovery module 100 can be used for exhaust waste heat recovery. The heat recovery module 100 includes a connecting tube 110. A plurality of conveying mechanisms 140 are arranged inside the connecting tube 110. A plurality of connecting mechanisms 150 are arranged inside the connecting tube 110 corresponding to the conveying mechanisms 140. The connecting mechanism 150 is connected between two adjacent conveying mechanisms 140. The two adjacent conveying mechanisms 140 can be connected end to end through the connecting mechanism 150. The plurality of conveying mechanisms 140 and the connecting mechanism 150 can form a spiral channel. The connecting mechanism 150 includes a fixed frame 151. The sides of both ends of the fixed frame 151 are provided with connecting grooves 152. The inner side of the fixed frame 151 is rotatably connected with a baffle 153. Both sides of the fixed frame 151 are provided with blocking plates 155. The interior of the connecting tube 110 is fixedly connected with a conveying frame 130 corresponding to the plurality of conveying mechanisms 140. The inner side of the conveying frame 130 is slidably connected with the side of the adjacent blocking plate 155. The side of the conveying frame 130 is provided with a plurality of opening grooves 131 corresponding to the blocking plate 155.

[0047] The bottom surface of the connecting tube 110 is fixedly connected to a plurality of support columns 113, the top surface of the connecting tube 110 is connected to an air inlet pipe 111, the bottom of the side surface of the connecting tube 110 is connected to an air outlet pipe 112, the top surface of the connecting tube 110 is fixedly connected to a conveying box 120 connected to the top of the conveying frame 130, and the side and top surfaces of the conveying box 120 are both connected to connecting pipes 121;

[0048] The two conveying modules 200 are both arranged on the connecting tube 110, and the conveying module 200 includes a conveying seat 210. The inner side surface of the connecting tube 110 and the side surface of the fixed frame 151 are fixedly connected to the side surface of the conveying seat 210. The inner side surface of the conveying seat 210 is slidingly connected to the side surface of the adjacent blocking plate 155. The top and bottom surfaces of the conveying seat 210 are both connected to a fixed tube 211. An opening groove 212 is opened on the side of the conveying seat 210 corresponding to the blocking plate 155. The two connecting grooves 152 on the fixed frame 151 are staggered with each other, and the blocking plate 155 can block the corresponding opening groove 1 131 or the opening groove 2 212.

[0049] Specifically, cold water can be transported to the inside of the transport box 120 through the connecting pipe 121 on the side of the transport box 120, and the cold water can enter the transport frame 130 from the transport box 120. The cold water in the transport frame 130 can enter the top of the spiral channel, and the cold water can flow along the inside of the transport mechanism 140 and the connecting mechanism 150, and then flow in the spiral channel, and the exhaust gas can be transported to the connecting tube 110 through the air inlet pipe 111, and the exhaust gas can flow along the outer wall of the transport mechanism 140 and the connecting mechanism 150, and then flow out of the air outlet pipe 111. 2, when the water flows in the spiral channel, the exhaust gas can heat the water, which can rotate the baffle 153 in the bottom fixed frame 151 and move the corresponding two blocking plates 155, so that the inside of the fixed frame 151 is separated by the baffle 153, and then the two connecting grooves 152 of the fixed frame 151 are separated, and the blocking plate 155 is moved away, so that the fixed frame 151 can be connected to the inside of the conveying frame 130 through one connecting groove 152, and the fixed frame 151 can be connected to the corresponding conveying frame 130 through the other connecting groove 152. The interior of the seat 210 is connected, while the interior of the fixed frame 151 is separated by a baffle 153, so that two sections separated from each other can be formed inside the spiral channel. While cold water is introduced into the top section of the spiral channel, cold water can be introduced into a fixed frame 151 at the bottom through the conveying frame 130 at the same time, and the cold water can flow into the bottom section of the spiral channel, and then cold water is introduced into both sections of the spiral channel at the same time. The cold water flows for a relatively long distance in the top section of the spiral channel, and the exhaust gas can heat the top cold water to generate water vapor, and then the water vapor and the remaining cold water can enter the corresponding conveying seat 210 from a fixed frame 151, and the water vapor is collected through the top fixed pipe 211, and the floating water vapor can be collected through the top connecting pipe 121, and the hot water can be collected through the bottom fixed pipe 211, while the cold water flows for a relatively short distance in the bottom section of the spiral channel, and the exhaust gas heats the bottom cold water to generate hot water, and the exhaust gas is further cooled by the bottom cold water, thereby recovering the heat in the exhaust gas more fully, which is conducive to the full recovery of the waste heat of the exhaust gas.

[0050] Embodiment 1

[0051] like Figure 2-9As shown, in this embodiment, the top and bottom of the inner side surface of the connecting tube 110 are fixedly connected with a connecting frame 160, the connecting frame 160 at the top is communicated with the inside of the conveying frame 130, and the connecting frame 160 at the bottom is communicated with the inside of the adjacent conveying seat 210, the two connecting frames 160 can respectively seal the top and bottom of the spiral channel, when cold water is introduced into the conveying frame 130, the cold water conveying frame 130 will enter the spiral channel from the top connecting frame 160, and the hot water at the bottom can enter the corresponding conveying seat 210 from the bottom connecting frame 160, and then be collected from the fixed pipe 211 at the bottom of the conveying seat 210, the two sides of the baffle 153 are fixedly connected with a connecting rod 154 passing through the inside of the adjacent blocking plate 155, the side of the connecting rod 154 is fixedly connected with a push rod 156, the bottom of the side of the push rod 156 is rotatably connected with a round block 157, and the side of the blocking plate 155 is provided with a sliding groove 158 that is slidably connected to the side of the adjacent round block 157;

[0052] The inner side surface of the conveying seat 210 is fixedly connected to an adjusting frame 220 that is rotatably connected to the side surfaces of several adjacent connecting rods 154. The inner side surface of the adjusting frame 220 is fixedly connected to a limiting rod 230 that is rotatably connected to the side surfaces of the adjacent connecting rods 154. A torsion spring 1 232 is arranged inside the limiting rod 230. The torsion spring 1 232 is located between the side surface of the connecting rod 154 and the inner side surface of the limiting rod 230. The side surface of the limiting rod 230 is rotatably connected to a support rod 231 that is rotatably connected to the side surface of the connecting rod 154. A torsion spring 233 is arranged inside the support rod 231. The torsion spring 233 is located between the connecting rod 154 and the support rod 231. An arc groove 234 is provided on the inner side of the rod 231, and a limit block 159 is fixedly connected to the side of a connecting rod 154 and is slidably connected to the inner side of the arc groove 234. The inner side of the adjusting frame 220 is slidably connected to the sliding block 222 corresponding to the support rod 231. The inner side of the adjusting frame 220 is rotatably connected to the limit rod 230 with an adjusting screw rod 221 that is screwed together with the sliding block 222, and the side of the adjusting screw rod 221 is rotatably connected to the inner side of the conveying seat 210. The adjusting screw rod 221 is arranged corresponding to the limit rod 230, and the adjusting screw rod 221 and the support rod 231 are staggered with each other to prevent the adjusting screw rod 221 from blocking the rotation of the support rod 231.

[0053] In a specific implementation, the limiting rod 230 can maintain the angle of the connecting rod 154 through the torsion spring 1 232, thereby limiting the angle of the baffle 153, so that the baffle 153 remains in an open state, and the connecting rod 154 can limit the position of the blocking plate 155 through the push rod 156 and the round block 157 to keep the blocking plate 155 closed. At the same time, the connecting rod 154 can maintain the angle of the support rod 231 through the torsion spring 233. Before the waste heat is recovered, the adjusting screw 221 can be rotated to adjust the screw 221. When the sliding block 222 is rotated, the sliding block 222 can move upward or downward. When the sliding block 222 moves downward and passes through the support rod 231, the bottom surface of the sliding block 222 can push the support rod 231 to rotate. Since the top surface of the fixed frame 151 abuts against the baffle 153, the baffle 153 can prevent the connecting rod 154 from rotating, so that the support rod 231 rotates downward relative to the connecting rod 154, and the arc groove 234 slides relative to the limit block 159, so that the sliding block 222 can smoothly pass through the support rod 231 when moving downward;

[0054] When the sliding block 222 moves upward and passes through the support rod 231, the top surface of the sliding block 222 can push the support rod 231 to rotate upward, and the support rod 231 can push the limit block 159 to rotate through the side wall of the arc groove 234, thereby pushing the connecting rod 154 to rotate, and the connecting rod 154 can drive the push rod 156 and the round block 157 to rotate, so that the round block 157 slides in the sliding groove 158, and the connecting rod 154 can drive the blocking plate 155 in the conveying seat 210 to move upward through the round block 157, and the connecting rod 154 can drive the blocking plate 155 in the conveying frame 130 to move downward through the round block 157, so that the two blocking plates 155 no longer block the opening groove One 131 and the opening groove two 212, and the connecting rod 154 can drive the baffle 153 to rotate downward. When the end of the support rod 231 contacts the side wall of the sliding block 222, the baffle 153 rotates downward ninety degrees. At this time, the interior of the fixed frame 151 can be divided by the baffle 153, and the position of the sliding block 222 in the two conveying seats 210 can be adjusted as needed, so as to divide the spiral channel into three sections. The top section of the spiral channel is relatively long and is used to gradually heat the cold water into water vapor, while the two bottom sections of the spiral channel are relatively short. The cold water in the two bottom sections of the spiral channel further cools the exhaust gas, which is beneficial to fully recover the heat of the exhaust gas.

[0055] like Figure 3-4 As shown, in this embodiment, the conveying mechanism 140 includes a spiral seat 141, a sliding plate 142, two screw-on cylinders 143, a grid plate 144, a plurality of fixed seats 145, and a plurality of return springs 146;

[0056] The spiral seat 141 is fixedly connected to the inner side of the connecting tube 110, the inner side of the spiral seat 141 is fixedly connected to the side of the conveying frame 130, the two sides of the fixed frame 151 on the long side are fixedly connected to the adjacent sides of the spiral seat 141, the side of the connecting frame 160 is fixedly connected to the adjacent sides of the spiral seat 141, the sliding plate 142 is slidably connected to the inner side of the spiral seat 141, the sliding plate 142 and the grid plate 144 can slide up and down in the spiral seat 141, and the cold water can flow downward between the spiral seat 141 and the sliding plate 142, and the sides of the fixed frame 151 and the connecting frame 160 are fixedly connected to the adjacent sides of the sliding plate 142. The two screw-on cylinders 143 are fixedly connected to the inner side surface of the sliding plate 142, and the side surface of the screw-on cylinder 143 is slidably connected to the inner side surface of the bottom of the screw seat 141. The screw-on cylinder 143 can slide on the screw seat 141, and the grid plate 144 is slidably connected to the inner side surface of the screw seat 141. A number of fixed seats 145 are respectively fixedly connected to the inner bottom surface of the screw seat 141, the top and bottom surfaces of the grid plate 144, and the bottom surface of the sliding plate 142, and a number of reset springs 146 are fixedly connected between two adjacent fixed seats 145.

[0057] In specific implementation, the return spring 146 can support the grid plate 144 and the sliding plate 142. Several return springs 146 and several fixed seats 145 form several groups of support members. Each group of support members includes a return spring 146 and two fixed seats 145. The return spring 146 is arranged between the two fixed seats 145. Several support members are respectively arranged between the inner bottom surface of the spiral seat 141 and the bottom surface of the grid plate 144, and between the top surface of the grid plate 144 and the bottom surface of the sliding plate 142. The grid plate 144 can play a role in heat conduction. When cold water flows, the grid plate 144 is conducive to increasing the heat exchange area, which is conducive to rapid heating of the cold water.

[0058] Embodiment 2

[0059] Based on the first embodiment, Figure 10-11As shown, in this embodiment, a connecting disk 170 is provided at the bottom of the connecting cylinder 110, and a plurality of sliding rods 172 that are slidably connected to the inner side surface of the connecting cylinder 110 are fixedly connected to the top surface of the connecting disk 170, and the inner side surfaces of the sliding plates 142 and the inner side surfaces of the spiral seats 141 are both slidably connected to the sides of the adjacent sliding rods 172, and a plurality of fixing rings 173 that are in contact with the top surfaces of the adjacent sliding plates 142 are fixedly connected to the sides of the sliding rods 172. Under the action of the reset spring 146, the top surface of the sliding plate 142 can be pressed against the bottom surface of the fixing ring 173, and the height of the sliding plate 142 is thereby limited by the sliding rods 172 and the fixing rings 173. A hydraulic rod 171 is provided at the top of the connecting disk 170, and the top end of the hydraulic rod 171 is fixedly connected to the bottom surface of the connecting cylinder 110, and the output end of the hydraulic rod 171 is transmission-connected to the top surface of the connecting disk 170, and the connecting cylinder 110 can limit the position of the connecting disk 170 through the hydraulic rod 171.

[0060] In a specific implementation, before the waste heat is recovered, the hydraulic rod 171 can be used to drive the connecting cylinder 110 to move up and down, the hydraulic rod 171 can drive the connecting plate 170 to move, the connecting plate 170 can drive the sliding rod 172 and the fixing ring 173 to move, when the fixing ring 173 moves downward, the sliding plate 142 can be driven downward by the fixing ring 173, when the fixing ring 173 moves upward, the sliding plate 142 can be moved upward by the action of the return spring 146, when the sliding plate 142 moves, The over-reset spring 146 pushes the grid plate 144 to move, and then adjusts the height of the sliding plate 142 and the grid plate 144 according to the water volume. In the subsequent waste heat recovery process, the grid plate 144 can correspond to the vicinity of the water surface and is located in the water. In this way, some space can be reserved between the grid plate 144 and the sliding plate 142, that is, some space is reserved in the spiral channel, which is beneficial to increase the evaporation area of ​​the water surface and facilitate the flow of water vapor in the spiral channel. At the same time, the grid plate 144 is beneficial to increase the heat conduction contact area.

[0061] like Figure 10-12 As shown, in this embodiment, two adjustment seats 180 are provided at the bottom of the connecting tube 110, and the inner side surface of the adjusting seat 180 is rotatably connected to two screw-in rods 181, and the side surface of the screw-in rod 181 is provided with a connecting thread screwed with the inner side surface of the adjacent screw-in tube 143, and the side surface of the screw-in rod 181 is slidably connected to a blocking ring 183 that is slidably connected to the inner side surface of the connecting tube 110. The blocking ring 183 can be connected to the bottom of the connecting tube 110 by bolts, etc., and the screw-in rod 181 and the connecting tube 110 are blocked by the blocking ring 183. The inner side surface of the adjusting seat 180 is rotatably connected to a positioning screw rod 182, and the bottom surface of the connecting tube 110 is fixedly connected to two positioning seats 190 that are screwed together with the side surfaces of the positioning screw rod 182.

[0062] In specific implementation, before the waste heat is recovered, the screwing rod 181 can be extended into the connecting tube 110. After the connecting thread at the top of the screwing rod 181 corresponds to the bottom screwing tube 143, the screwing rod 181 is rotated to make the connecting thread at the top pass through the bottom screwing tube 143, and the screwing rod 181 is extended to the corresponding position. After the positioning screw rod 182 is screwed into the positioning seat 190, the connecting thread on the screwing rod 181 is screwed into the corresponding screwing tube 143, and then the blocking ring 183 is moved upward along the screwing rod 181 and inserted into the bottom of the connecting tube 110 to block the bottom of the connecting tube 110. At this time, the positioning screw rod 182 can be rotated to make the positioning screw rod 182 move along the positioning seat 190. 0 moves downward, the positioning screw rod 182 can drive the adjustment seat 180 to move downward, the adjustment seat 180 can drive the screw rod 181 to move downward, the screw rod 181 can drive the sliding plate 142 to move downward through the screw cylinder 143, and then adjust the position of the sliding plate 142 on the two sections at the bottom of the spiral channel. In the subsequent waste heat recovery process, the sliding plate 142 is made to contact with the water surface of the bottom cold water, and no part of the space is reserved. In this way, in the process of producing hot water, the heat exchange contact area with the cold water is increased through the sliding plate 142, which is beneficial to the rapid cooling of the exhaust gas by the bottom cold water. Multiple adjustment seats 180 can be configured according to needs, and the screw rods 181 on the adjustment seats 180 have different lengths.

[0063] like Fig.13 As shown, a process for recovering waste heat from tail gas from natural gas reforming to produce hydrogen includes a waste heat recovery device for recovering waste heat from tail gas from natural gas reforming to produce hydrogen. The process specifically includes the steps of tail gas collection - tail gas pretreatment - waste heat recovery - tail gas purification. The specific steps are as follows:

[0064] Step 1: tail gas collection: collecting tail gas from the natural gas reforming hydrogen production process, collecting the tail gas and transporting it to a recovery pipeline network;

[0065] Step 2 Tail gas pretreatment: The tail gas is transported to the pretreatment process through the recovery pipeline network to remove impurities and harmful substances in the tail gas to ensure that the tail gas will not cause damage to subsequent equipment;

[0066] Step 3: Waste heat recovery: The pretreated tail gas is transported to a waste heat recovery device, and waste heat is recovered from the tail gas through the waste heat recovery device. Water in the waste heat recovery device is heated to produce steam and hot water.

[0067] Step 4 Exhaust gas purification: After heat recovery, the exhaust gas is further purified to further remove harmful substances in the exhaust gas to ensure that the exhaust gas emissions meet environmental protection standards.

[0068] In step 2, in the tail gas pretreatment step, the tail gas is pretreated for desulfurization and denitrification;

[0069] After the exhaust gas is purified in step 4, the exhaust gas is tested using a gas detection device, and the test results are transmitted in real time to monitor whether the exhaust gas pollutant content meets the requirements.

[0070] The produced water vapor can be used to prepare hydrogen, and the hot water can be added to the boiler to prepare water vapor, or the hot water can be used for domestic water.

[0071] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and range of equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0072] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A waste heat recovery device for tail gas from natural gas reforming to produce hydrogen, characterized in that: include: A heat recovery module (100) can be used for exhaust gas waste heat recovery. The heat recovery module (100) comprises a connecting tube (110). A plurality of conveying mechanisms (140) are arranged inside the connecting tube (110). A plurality of connecting mechanisms (150) are arranged inside the connecting tube (110) corresponding to the conveying mechanisms (140). The connecting mechanism (150) comprises a fixed frame (151). Both ends of the fixed frame (151) have connecting grooves (152) on their side surfaces. The inner side of the fixed frame (151) is rotatably connected to a baffle (153). Both sides of the fixed frame (151) are provided with blocking plates (155). A conveying frame (130) is fixedly connected inside the connecting tube (110) corresponding to the plurality of conveying mechanisms (140). The inner side of the conveying frame (130) is slidably connected to the side of an adjacent blocking plate (155). The side of the conveying frame (130) is provided with a plurality of opening grooves (131) corresponding to the blocking plate (155). Two conveying modules (200) are both arranged on the connecting tube (110), and the conveying module (200) comprises a conveying seat (210). The inner side surface of the connecting tube (110) and the side surface of the fixing frame (151) are both fixedly connected to the side surface of the conveying seat (210), and the inner side surface of the conveying seat (210) is slidably connected to the side surface of the adjacent blocking plate (155). The side surface of the conveying seat (210) is provided with an opening groove (212) corresponding to the blocking plate (155).

2. The device for recovering waste heat from tail gas from hydrogen production by reforming natural gas according to claim 1, characterized in that: The bottom surface of the connecting tube (110) is fixedly connected to a plurality of support columns (113); the top surface of the connecting tube (110) is connected to an air inlet pipe (111); the bottom of the side surface of the connecting tube (110) is connected to an air outlet pipe (112); the top surface of the connecting tube (110) is fixedly connected to a conveying box (120) connected to the top of a conveying frame (130); and the side surface and top surface of the conveying box (120) are both connected to a connecting tube (121).

3. The device for recovering waste heat from tail gas from hydrogen production by reforming natural gas according to claim 1, characterized in that: The top and bottom of the inner side surface of the connecting tube (110) are fixedly connected with a connecting frame (160), the connecting frame (160) located at the top is connected to the inside of the conveying frame (130), and the connecting frame (160) located at the bottom is connected to the inside of the adjacent conveying seat (210), and the two side surfaces of the baffle (153) are fixedly connected with a connecting rod (154) passing through the inside of the adjacent blocking plate (155), the side of the connecting rod (154) is fixedly connected with a pushing rod (156), and the bottom of the side of the pushing rod (156) is rotatably connected with a round block (157), and the side of the blocking plate (155) is provided with a sliding groove (158) that is slidably connected to the side of the adjacent round block (157).

4. The device for recovering waste heat from tail gas from hydrogen production by reforming natural gas according to claim 3, characterized in that: The top and bottom surfaces of the conveying seat (210) are both connected to a fixed tube (211); the inner side surface of the conveying seat (210) is fixedly connected to an adjustment frame (220) that is rotatably connected to the side surfaces of a plurality of adjacent connecting rods (154); the inner side surface of the adjustment frame (220) is fixedly connected to a limit rod (230) that is rotatably connected to the side surfaces of the adjacent connecting rods (154); a torsion spring (232) is arranged inside the limit rod (230); the torsion spring (232) is located between the side surface of the connecting rod (154) and the inner side surface of the limit rod (230); the side surface of the limit rod (230) is rotatably connected to a support rod (231) that is rotatably connected to the side surface of the connecting rod (154); the support rod (231) is inside A second torsion spring (233) is provided, the second torsion spring (233) is located between the connecting rod (154) and the support rod (231), an arc groove (234) is provided on the inner side of the support rod (231), a limit block (159) is fixedly connected to the side of the connecting rod (154) and is slidably connected to the inner side of the arc groove (234), the inner side of the adjustment frame (220) is slidably connected to a sliding block (222) corresponding to the support rod (231), the inner side of the adjustment frame (220) is rotatably connected to an adjustment screw rod (221) screwed and connected to the sliding block (222) corresponding to the limit rod (230), and the side of the adjustment screw rod (221) is rotatably connected to the inner side of the conveying seat (210).

5. The device for recovering waste heat from tail gas from hydrogen production by reforming natural gas according to claim 3, characterized in that: The conveying mechanism (140) comprises: The spiral seat (141) is fixedly connected to the inner side of the connecting tube (110), the inner side of the spiral seat (141) is fixedly connected to the side of the conveying frame (130), the two side surfaces of the fixing frame (151) located on the long side are fixedly connected to the side surfaces of the adjacent spiral seat (141), and the side surface of the connecting frame (160) is fixedly connected to the side surfaces of the adjacent spiral seat (141); The sliding plate (142) is slidably connected to the inner side surface of the spiral seat (141), and the side surfaces of the fixed frame (151) and the connecting frame (160) are both slidably connected to the side surfaces of the adjacent sliding plate (142); Two screw-on cylinders (143) are fixedly connected to the inner side surface of the sliding plate (142), and the side surface of the screw-on cylinder (143) is slidably connected to the inner side surface of the bottom of the spiral seat (141); A grid plate (144) is slidably connected to the inner side of the spiral seat (141); A plurality of fixed seats (145) are respectively fixedly connected to the inner bottom surface of the spiral seat (141), the top surface and bottom surface of the grid plate (144), and the bottom surface of the sliding plate (142); A plurality of return springs (146) are fixedly connected between two adjacent fixing seats (145).

6. The device for recovering waste heat from tail gas from hydrogen production by reforming natural gas according to claim 5, characterized in that: A connecting disk (170) is arranged at the bottom of the connecting cylinder (110); a plurality of sliding rods (172) are fixedly connected to the top surface of the connecting disk (170) and are slidably connected to the inner side surface of the connecting cylinder (110); the inner side surface of the sliding plate (142) and the inner side surface of the spiral seat (141) are both slidably connected to the side surfaces of adjacent sliding rods (172); a plurality of fixing rings (173) are fixedly connected to the side surfaces of the sliding rods (172) and are in contact with the top surfaces of adjacent sliding plates (142); a hydraulic rod (171) is arranged at the top of the connecting disk (170); the top end of the hydraulic rod (171) is fixedly connected to the bottom surface of the connecting cylinder (110); and the output end of the hydraulic rod (171) is drivingly connected to the top surface of the connecting disk (170).

7. The device for recovering waste heat from tail gas from hydrogen production by reforming natural gas according to claim 5, characterized in that: Two adjustment seats (180) are arranged at the bottom of the connecting tube (110); the inner side surface of the adjustment seat (180) is rotatably connected to two screwing rods (181); the side surface of the screwing rod (181) is provided with a connecting thread screwed with the inner side surface of the adjacent screwing tube (143); the side surface of the screwing rod (181) is slidably connected to a blocking ring (183) slidably connected to the inner side surface of the connecting tube (110); the inner side surface of the adjustment seat (180) is rotatably connected to a positioning screw rod (182); and the bottom surface of the connecting tube (110) is fixedly connected to two positioning seats (190) screwed with the side surface of the positioning screw rod (182).

8. A process for recovering waste heat from tail gas from natural gas reforming to produce hydrogen, the process comprising the device for recovering waste heat from tail gas from natural gas reforming to produce hydrogen as claimed in claim 1, characterized in that: The process specifically includes the steps of tail gas collection - tail gas pretreatment - waste heat recovery - tail gas purification. The specific steps are as follows: Step (1) tail gas collection: collecting tail gas from the natural gas reforming hydrogen production process, collecting the tail gas and transporting it to a recovery pipeline network; Step (2) tail gas pretreatment: transporting the tail gas to the pretreatment process through the recovery pipeline network to remove impurities and harmful substances in the tail gas to ensure that the tail gas will not cause damage to subsequent equipment; Step (3) waste heat recovery: the pretreated tail gas is transported to a waste heat recovery device, and the waste heat of the tail gas is recovered by the waste heat recovery device, and water in the waste heat recovery device is heated to produce steam and hot water; Step (4) exhaust gas purification: After heat recovery, the exhaust gas is further purified to further remove harmful substances in the exhaust gas to ensure that the exhaust gas emissions meet environmental protection standards.

9. The process for recovering waste heat from tail gas from hydrogen production by reforming natural gas according to claim 8, characterized in that: In step (2), the tail gas pretreatment step, the tail gas is pretreated for desulfurization and denitrification.

10. The process for recovering waste heat from tail gas from hydrogen production by reforming natural gas according to claim 8, characterized in that: After the tail gas is purified in step (4), the tail gas is tested using a gas detection device, and the test results are transmitted in real time to monitor whether the tail gas pollutant content meets the requirements.

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