Waste heat utilization and recovery device

Abstract

The utility model discloses a waste heat utilization and recovery device, which relates to the technical field of waste heat recovery and comprises a waste heat passage connected into a heat supply passage, and a heat supply heat exchanger in the heat supply passage and a waste heat exchanger in the waste heat passage are arranged in parallel. Therefore, the heat supply heat exchanger and the waste heat exchanger supply heat to fluid in the methanol thermal regeneration tower without mutual interference. According to the utility model, the waste heat passage is connected into the original heat supply passage, and the waste heat exchanger in the waste heat passage and the heat supply heat exchanger in the heat supply passage are arranged in parallel and supply heat to the fluid in the methanol thermal regeneration tower without mutual interference. By additionally arranging the waste heat channel, waste heat of other workshops outside can be recycled and transmitted to fluid through the waste heat channel, heat inflow in the heat supply channel is reduced, energy recycling is achieved, and energy is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat recovery of regeneration towers, in particular to a waste heat utilization and recovery device. Background Art

[0002] In the synthetic ammonia production process, a methanol thermal regeneration tower is provided in the low-temperature methanol cleaning device. The heating method of the methanol thermal regeneration tower is generally low-pressure steam heating. Specifically, a pair of inlets and outlets of the heat exchanger are connected to the methanol thermal regeneration tower through a pipe to form a heat supply path. The fluid in the methanol thermal regeneration tower can circulate through the heat supply path, and then 0.5MPa steam is introduced into the other pair of inlets of the heat exchanger, and the steam is discharged from the outlet corresponding to the inlet. In this process, the steam flow rate needs to be guaranteed to be about 6t / h. This heating state can be controlled by Figure 1 denoted by , where 101 represents the methanol thermal regeneration tower, 102 represents the heat supply heat exchanger, and 103 represents the connecting pipes. In this method, the heat of the steam is transferred to the fluid in the heat supply path through the heat supply heat exchanger. When the fluid flows into the methanol thermal regeneration tower, it heats the methanol containing H2S inside the methanol thermal regeneration tower. However, this single low-pressure steam heating method consumes a lot of steam energy, resulting in high operating costs for enterprises.

[0003] At the same time, after the heat exchanger has been working for a long time, scale and the like will adhere to the inside of the heat exchanger. During subsequent maintenance, the inside of the heat exchanger needs to be cleaned. Generally, the staff will remove the heat exchanger from the passage and then pass cleaning liquid into its inlet to achieve cleaning. However, this method of cleaning requires disassembly and assembly, which is labor-intensive and cumbersome to operate, resulting in low cleaning efficiency.

[0004] To this end, we propose a waste heat recovery device to solve the above problems. Utility Model Content

[0005] The purpose of this utility model is to solve the problems in the prior art by proposing a waste heat recovery device. This device connects a waste heat passage to the original heat supply passage. The waste heat exchanger in the waste heat passage and the heat supply heat exchanger in the heat supply passage are arranged in parallel. The two heat the fluid in the methanol thermal regeneration tower without interfering with each other. Compared with the prior art that simply uses the heat supply passage to heat the fluid, the utility model adds a waste heat passage. The waste heat passage can recover waste heat from other workshops and transfer it to the fluid. This not only reduces the heat inflow into the heat supply passage, but also realizes energy recovery and saves energy. At the same time, the heat exchanger can also be cleaned by using the liquid inlet and outlet pipes.

[0006] In order to solve the above problems, the present invention provides the following technical solutions:

[0007] A waste heat utilization and recovery device includes a waste heat path connected to a heat supply path, wherein a heat supply heat exchanger in the heat supply path and a waste heat exchanger in the waste heat path are arranged in parallel, so that the heat supply heat exchanger and the waste heat exchanger do not interfere with each other and supply heat to the fluid in a methanol thermal regeneration tower; the recovery device also includes a liquid inlet pipe and a liquid outlet pipe both having an opening and closing function, one end of the liquid inlet pipe is connected to the inlet end of the heat supply heat exchanger and / or the waste heat exchanger, and one end of the liquid outlet pipe is connected to the outlet end of the heat supply heat exchanger and / or the waste heat exchanger.

[0008] As a further solution of the present invention: the recovery device also includes a filter component connected to the outlet end of the heat supply heat exchanger and / or the waste heat exchanger.

[0009] As a further solution of the present invention: the filter assembly includes a connecting cylinder that can be detachably connected to the corresponding passage at the outlet end of the heat supply heat exchanger and / or the waste heat exchanger, and the interior of the connecting cylinder is provided with a plurality of baffles and filter screens along its axial direction, and a plurality of the baffles are circumferentially arrayed on the inner wall of the connecting cylinder, and the plurality of baffles are arranged in a truncated cone shape as a whole, and the large diameter ends and small diameter ends formed by the plurality of baffles in the truncated cone layout are arranged in sequence along the flow direction of the fluid, and a temporary storage area is formed between the filter screen and the small diameter end.

[0010] As a further solution of the present invention: the filter screen can move along the axial direction of the adapter cylinder to achieve adjustable size of the temporary storage area.

[0011] As a further solution of the present invention: one end of the baffle is hingedly arranged on the inner wall of the adapter cylinder, and a reset member connected to the baffle is provided on the adapter cylinder, and the reset member is used to make the other end of the baffle have a movement tendency to rotate away from the inner wall of the adapter cylinder.

[0012] As a further solution of the present invention: the reset member is a reset spring.

[0013] As a further solution of the present invention: the liquid inlet pipe and the liquid outlet pipe are both provided with on-off valves for realizing their opening and closing functions.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. By connecting a waste heat passage to the original heat supply passage, the waste heat exchanger in the waste heat passage and the heat supply heat exchanger in the heat supply passage are arranged in parallel, and the two heat the fluid in the methanol heat regeneration tower without interfering with each other. Compared with the existing technology that simply uses the heat supply passage to heat the fluid, the utility model adds a waste heat passage, which can recover the waste heat from other workshops outside and transfer it to the fluid, not only reducing the heat inflow into the heat supply passage, but also realizing energy recovery and saving energy;

[0016] 2. Through the setting of the liquid inlet pipe and the liquid outlet pipe, when the inside of the corresponding heat exchanger needs to be cleaned, the cleaning liquid is transported to the liquid inlet pipe. After the cleaning liquid enters the corresponding heat exchanger, it is discharged from the liquid outlet pipe to achieve cleaning. No disassembly is required, and cleaning is convenient;

[0017] 3. Through the setting of the filter assembly, the temporary storage area on the filter assembly can be used to temporarily store the scale discharged from the outlet of the corresponding heat exchanger to prevent it from moving with the cleaning fluid. Before the heat exchanger performs normal heat exchange work, the filter assembly can be removed without interfering with the flow of the fluid;

[0018] 4. By setting the filter to be movable along the axial direction of the adapter cylinder, the size of the temporary storage area can be adjusted to adapt to cleaning work in different situations;

[0019] 5. Through the hinged setting of the baffles, when the cleaning liquid drives a large volume of scaling to move to multiple baffles, since the baffles are hingedly installed on the inner wall of the adapter cylinder, the baffles can be squeezed and rotated, and the scaling will enter the temporary storage area under the push of the cleaning liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] Figure 1 It is a schematic diagram of the heat supply path structure in the prior art;

[0022] Figure 2 It is a structural diagram of the utility model;

[0023] Figure 3 It is a schematic diagram of the cross-sectional structure of the filter component in the present utility model.

[0024] In the figure: 101, methanol thermal regeneration tower; 102, heat supply heat exchanger; 103, connecting pipe;

[0025] 1. Waste heat exchanger; 2. Liquid inlet pipe; 3. Liquid outlet pipe; 4. Filter assembly; 401. Adapter cylinder; 402. Baffle; 403. Filter screen; 404. Temporary storage area; 405. Reset component; 5. On-off valve. DETAILED DESCRIPTION

[0026] The following will be combined with the accompanying 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0027] In the above, a pair of inlets and outlets of the heat supply heat exchanger 102 and the methanol thermal regeneration tower 101 form a heat supply passage through the connecting pipe 103. The fluid in the methanol thermal regeneration tower 101 can circulate through the heat supply passage, and then 0.5MPa steam is introduced into the other pair of inlets of the heat supply heat exchanger 102, and the steam is discharged from the outlet corresponding to the inlet. The heat of the steam is transferred to the fluid through the heat supply heat exchanger 102, thereby realizing heating of the fluid.

[0028] In the urea production process, a high-temperature solution is generated in the urea production device. The flow rate of the high-temperature solution reaches 200t / h and the temperature is 124-130℃. In order to recover its heat, it is generally preheated to 0.6MPA desalted water. However, due to the excess heat in the preheating process and the fact that the heat exchanger used in the preheating process is a reused water cooler, the heat is not fully utilized, resulting in a waste of resources.

[0029] Based on the two production processes described above, technicians conceived the idea of ​​adding a heat exchanger to transfer the heat contained in the high-pressure solution to the methanol thermal regeneration tower 101. This not only reduces the amount of 0.5 MPa steam introduced, but also fully recovers and reuses the heat in the high-pressure solution. The specific configuration is described in Example 1.

[0030] Example 1:

[0031] like Figure 2As shown, a waste heat utilization and recovery device includes a waste heat passage, wherein the waste heat passage has a waste heat exchanger 1, a pair of inlets and outlets of the waste heat exchanger 1 are respectively connected to the connection ports in the external workshop (which can be a urea production workshop), so that the waste heat in the external workshop can be transferred to the waste heat exchanger 1, and the other inlet and outlet of the waste heat exchanger 1 is connected to the connecting pipe 103 in the heat supply passage, so that the fluid can also flow through the waste heat exchanger 1, and the heat on the waste heat exchanger 1 can be transferred to the fluid, that is, the fluid can not only be heated by the heat supply heat exchanger 102, but also by the waste heat exchanger 1. Compared with the prior art that simply uses the heat supply passage to heat the fluid, the utility model adds a waste heat passage, and the waste heat passage can recover the waste heat from other external workshops and transfer it to the fluid, which not only reduces the heat inflow in the heat supply passage, but also realizes energy recovery and saves energy.

[0032] During use, in order to ensure that the heat supply path and the waste heat path work independently without interfering with each other, when the waste heat path is connected to the heat supply path, it is necessary to ensure that the heat supply heat exchanger 102 in the heat supply path and the waste heat exchanger 1 in the waste heat path are arranged in parallel, thereby ensuring the independent operation of the heat supply heat exchanger 102 and the waste heat exchanger 1. When one of them is disturbed, the other can work normally.

[0033] Example 2:

[0034] Based on the cleaning method in the prior art, the present invention further includes a liquid inlet pipe 2 and a liquid outlet pipe 3, both of which have opening and closing functions. Specifically, an on-off valve 5 is provided on the liquid inlet pipe 2 and the liquid outlet pipe 3 for realizing the opening and closing functions. When the heat exchanger is operating normally, the on-off valves 5 on the liquid inlet pipe 2 and the liquid outlet pipe 3 are both in a closed state. There are three situations for the position design of the liquid inlet pipe 2 and the liquid outlet pipe 3, which are specifically shown as follows:

[0035] (1) One end of the liquid inlet pipe 2 is connected to the common inlet end of the heat supply heat exchanger 102 and the waste heat exchanger 1, and one end of the liquid outlet pipe 3 is connected to the common outlet end of the heat supply heat exchanger 102 and the waste heat exchanger 1. This design state can be obtained by Figure 2 To express;

[0036] (2) One end of the liquid inlet pipe 2 is connected to the inlet end of the heat supply heat exchanger 102, and one end of the liquid outlet pipe 3 is connected to the outlet end of the heat supply heat exchanger 102;

[0037] (3) One end of the liquid inlet pipe 2 is connected to the inlet end of the waste heat exchanger 1, and one end of the liquid outlet pipe 3 is connected to the outlet end of the waste heat exchanger 1.

[0038] In any of the above cases, when the interior of the corresponding heat exchanger needs to be cleaned, cleaning liquid is delivered to the liquid inlet pipe 2. After the cleaning liquid enters the corresponding heat exchanger, it is discharged from the liquid outlet pipe 3 to achieve cleaning. No disassembly is required, and cleaning is convenient.

[0039] Example 3:

[0040] During the cleaning process in Example 2, if the scale inside the heat exchanger is large in volume, the scale may get stuck at the corners of the passageway during the flow of the scale along with the cleaning liquid, thus affecting the subsequent cleaning process. To this end, this embodiment adds a filter assembly 4 connected to the outlet of the heat supply heat exchanger 102 and / or the waste heat exchanger 1 on the basis of Example 2. Figure 2 Figure 1 shows a filter assembly 4 installed at the outlets of both the heat supply heat exchanger 102 and the waste heat exchanger 1. This assembly temporarily stores scale discharged from the respective heat exchanger outlets, preventing it from migrating with the cleaning fluid. Before normal heat exchange operation, the filter assembly 4 can be removed to prevent interference with fluid flow. Before cleaning the heat exchanger, the filter assembly 4 can be sealed and installed at the outlet of the respective heat exchanger.

[0041] like Figure 3 As shown, specifically, the filter assembly 4 includes a connecting cylinder 401 that can be detachably connected to the corresponding passage at the outlet end of the heat supply heat exchanger 102 and / or the waste heat exchanger 1. The interior of the connecting cylinder 401 is provided with a plurality of baffles 402 and a filter screen 403 along its axial direction. The plurality of baffles 402 are circumferentially arrayed on the inner wall of the connecting cylinder 401. The plurality of baffles 402 are arranged in a truncated cone shape as a whole, and the large-diameter end and the small-diameter end formed by the plurality of baffles 402 in the truncated cone layout are arranged in sequence along the flow direction of the fluid, and a temporary storage area 404 is formed between the filter screen 403 and the small-diameter end.

[0042] When the cleaning liquid drives the scale to flow to the outlet end of the heat exchanger, the scale will pass through the large-diameter end and the small-diameter end of the multiple baffles 402 in turn, and then enter the temporary storage area 404. If the volume of the scale is smaller than the aperture of the filter 403, it can pass through the filter 403 with the cleaning liquid and be discharged from the liquid outlet pipe 3, while larger scale will be blocked in front of the filter 403. At the same time, due to the frustum-shaped layout composed of the multiple baffles 402, larger scale can be blocked in the temporary storage area 404. After the subsequent cleaning is completed, it is only necessary to remove the adapter cylinder 401 from the passage.

[0043] Example 4:

[0044] This embodiment improves the installation of the baffle 402 based on the third embodiment. Specifically, one end of the baffle 402 is hingedly mounted on the inner wall of the adapter cylinder 401, and the adapter cylinder 401 is provided with a reset member 405 connected to the baffle 402. The reset member 405 can be a reset spring, etc., and is used to cause the other end of the baffle 402 to have a tendency to rotate away from the inner wall of the adapter cylinder 401. With this design, when the cleaning liquid drives a large volume of scale to move to the multiple baffles 402, because the baffles 402 are hingedly mounted on the inner wall of the adapter cylinder 401, the baffles 402 can be squeezed and rotated, and the scale will enter the temporary storage area 404 under the push of the cleaning liquid.

[0045] Furthermore, in order to increase the storage space of the temporary storage area 404, the filter 403 can be set to be movable along the axial direction of the adapter cylinder 401 in the above-mentioned embodiments 3 and 4, so as to achieve adjustable size of the temporary storage area 404 to adapt to cleaning work in different situations.

[0046] The above describes an embodiment of the present invention in detail. However, the above content is only a preferred embodiment of the present invention and should not be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent application of the present invention.

Claims

1. A waste heat recovery device, characterized in that: The invention comprises a waste heat path connected to the heat supply path, wherein the heat supply heat exchanger (102) in the heat supply path and the waste heat exchanger (1) in the waste heat path are arranged in parallel, so that the heat supply heat exchanger (102) and the waste heat exchanger (1) do not interfere with each other and supply heat to the fluid in the methanol thermal regeneration tower (101); the recovery device also comprises a liquid inlet pipe (2) and a liquid outlet pipe (3) both having an opening and closing function, one end of the liquid inlet pipe (2) is connected to the inlet end of the heat supply heat exchanger (102) and / or the waste heat exchanger (1), and one end of the liquid outlet pipe (3) is connected to the outlet end of the heat supply heat exchanger (102) and / or the waste heat exchanger (1).

2. The waste heat recovery device according to claim 1, characterized in that: The recovery device further comprises a filter assembly (4) connected to the outlet end of the heat supply heat exchanger (102) and / or the waste heat exchanger (1).

3. The waste heat recovery device according to claim 2, characterized in that: The filter assembly (4) comprises a transfer cylinder (401) that is detachably connected to a passage corresponding to an outlet end of a heat supply heat exchanger (102) and / or a waste heat exchanger (1); a plurality of baffles (402) and a filter screen (403) are arranged in an axial direction inside the transfer cylinder (401); a plurality of baffles (402) are circumferentially arrayed on the inner wall of the transfer cylinder (401); the plurality of baffles (402) are arranged in a truncated cone shape as a whole; and the large-diameter ends and small-diameter ends formed by the plurality of baffles (402) in the truncated cone shape are arranged in sequence along the flow direction of the fluid; a temporary storage area (404) is formed between the filter screen (403) and the small-diameter end.

4. The waste heat recovery device according to claim 3, characterized in that: The filter screen (403) can move along the axial direction of the adapter cylinder (401) to achieve adjustable size of the temporary storage area (404).

5. A waste heat recovery device according to claim 3 or 4, characterized in that: One end of the baffle (402) is hingedly arranged on the inner wall of the adapter cylinder (401), and a reset member (405) connected to the baffle (402) is provided on the adapter cylinder (401). The reset member (405) is used to make the other end of the baffle (402) have a movement tendency to rotate away from the inner wall of the adapter cylinder (401).

6. The waste heat recovery device according to claim 5, characterized in that: The reset member (405) is a reset spring.

7. The waste heat recovery device according to claim 1, characterized in that: The liquid inlet pipe (2) and the liquid outlet pipe (3) are both provided with on-off valves (5) for realizing their opening and closing functions.

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