Steam generating device for recycling waste heat of low-temperature process

Abstract

The utility model relates to a low-grade steam generating device for recovering waste heat of a low-temperature process, which comprises a steam generator, the steam generator comprises a left seal head, a shell and a right seal head, the left seal head and the right seal head are connected through a heat exchange tube, a tube-shell structure is formed between the heat exchange tube and the shell, the interior of the shell is a shell pass, the interior of the heat exchange tube is a tube pass, and the shell pass is a tube pass. A desalted water pipeline is arranged at the bottom of the shell, a demister is arranged at an opening in the top of the shell, and a steam pipeline is connected to the demister; a process material feeding pipe is arranged at the top of the left end socket; a process material discharging pipe is arranged at the bottom of the right end socket. The device has the beneficial effects that the circulating water consumption of the chemical production device is reduced, and the byproduct low-grade steam can be used as a heat source for production of the device or drive power equipment. Process waste heat is recycled through the steam generator, process materials are cooled to the target temperature under the condition that circulating cooling water is not consumed, and energy consumption of a factory is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat recovery in chemical production processes, and in particular to a low-grade steam generating device for recovering waste heat in low-temperature processes. Background Art

[0002] In recent years, chemical process waste heat has been widely recycled and utilized in chemical production. At present, a variety of process waste heat recovery and utilization technologies and equipment have been developed at home and abroad, such as waste heat boilers, waste heat power generation, waste heat evaporation, waste heat drying, etc. These technologies and equipment have broad application prospects in chemical production, such as in oil refining, fertilizers, chemical fibers, ceramics and other fields. However, these technologies have good effects on recovering waste heat of materials with higher temperatures. However, in the process of chemical production, the process waste heat recovery of materials with lower temperatures (generally around 100-150℃) has been highly valued in recent years. Therefore, the temperature of some materials is relatively low, and the steam produced by heat exchange carries a large amount of water, which seriously affects the normal operation of equipment pipelines. At present, circulating water is generally used to directly cool to the target temperature through a heat exchanger, resulting in this part of the process waste heat not being utilized and consuming a large amount of circulating water. If this part of low-temperature waste heat can be recovered and utilized, it can effectively reduce energy consumption, reduce environmental pollution, and save production costs.

[0003] Patent CN213454986U discloses a sintering machine waste heat recovery steam generating device. The utility model discloses a sintering machine waste heat recovery steam generating device, comprising a flue, the outer surface of the flue is equipped with a fixing frame, the inner surface of the fixing frame is equipped with a heat collecting pipe, and the heat collecting pipe is flat. The utility model provides a flue structure with a fixing frame and a heat collecting pipe. When in use, firstly, the first circulation pipe, the second circulation pipe and the third circulation pipe are assembled on the outer surface of the pipe, then the connecting pipe is connected, and finally the fixing frame is assembled on the outer surface of the connecting pipe, and the middle part of the fixing frame is connected to the mounting plate, and finally the connecting pipe connected to one end of the liquid inlet pipe is assembled on the output end of the water delivery pump, and the connecting pipe at one end of the discharge pipe is assembled in the hot water recovery equipment, and is processed into steam for use in the subsequent heating process, which effectively solves the problem that the pipes of the existing flue recovery structure are mostly coiled pipes, which are not easy to dismantle and inconvenient to maintain and repair, and reduces the energy consumption of steam production. This patented technology uses a flue structure with heat collecting tubes to recover the heat of sintering machine flue gas, which is not suitable for waste heat recovery in chemical production processes.

[0004] Patent CN116972374A discloses a steam generating device for steam storage and steam-water separation for waste heat recovery of cooling bed. The present invention relates to a steam generating device for steam storage and steam-water separation for waste heat recovery of cooling bed, characterized in that: it comprises a drum body, the drum body is a can-shaped cavity structure, the drum body is connected with a double-way water replenishment device, the double-way water replenishment device comprises a first water inlet mother pipe and a second water inlet mother pipe, the first water inlet mother pipe is arranged on the outside of the drum body and is horizontally spaced from the drum body, the first water inlet mother pipe is provided with a water inlet and a plurality of water outlets, the water outlets are connected with the inner cavity of the drum body; the second water inlet mother pipe is arranged on the bottom sewage outlet of the drum body, one end of the second water inlet mother pipe is connected with the inner cavity of the drum body through the sewage outlet; the lower side of the drum body is provided with a pair of water outlets, the water outlet is provided with an anti-vortex device, and the anti-vortex device is a cross structure. The device of the present invention can adapt to the intermittent production process of the cooling bed, intermittent work and other working conditions. This patented technology uses the steam drum to recover the waste heat from the cooling bed, which is not suitable for waste heat recovery in chemical production processes. Summary of the invention

[0005] The utility model aims to solve the problem that the process waste heat of materials with relatively low temperatures (generally around 100-150°C) in the chemical production process is difficult to recover as mentioned above; a low-grade steam generating device for recovering process waste heat is provided, and materials with relatively low temperatures (generally around 100-150°C) in the chemical production process are indirectly heat exchanged with desalted water at around 100°C in a low-grade steam generator, and the desalted water absorbs heat and undergoes phase change to generate low-grade steam. This technology not only reduces the temperature of the process materials, but also produces low-grade steam as a by-product.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is as follows: it includes a steam generator, the steam generator includes a left head, a shell and a right head, the left head and the right head are connected by a heat exchange tube, a shell and tube structure is formed between the heat exchange tube and the shell, the inside of the shell is a shell side, the inside of the heat exchange tube is a tube side, a desalted water pipeline is arranged at the bottom of the shell, and a demister is arranged at a hole in the top of the shell. The demister can effectively separate the water entrained by the low-grade saturated steam and prevent the generated low-grade steam from carrying water and causing water hammer in the pipeline equipment. The demister is connected to the steam pipeline; a process material feed pipe is arranged at the top of the left head, and a process material discharge pipe is arranged at the bottom of the right head.

[0007] A drug adding pipeline is also arranged at the bottom of the shell, and the drug adding pipeline is connected to a drug injector to inject phosphate to improve the steam quality.

[0008] Liquid level transmitters are arranged on the left and right sides of the outer wall of the shell, and a temperature transmitter and a pressure transmitter are arranged on the top.

[0009] The demister is also provided with a safety pipe in parallel with the steam pipe, and the safety pipe is provided with a safety valve and a muffler to reduce noise pollution.

[0010] The steam pipe is connected in parallel with a vent pipe, and a muffler is arranged on the vent pipe to reduce noise pollution.

[0011] The bottom of the shell is also provided with a sewage pipe to prevent scaling of the steam generator shell.

[0012] As a preferred solution, the heat exchange tube is a metal sintered flux tube, the base tube is a high-grade cold-drawn seamless steel tube, the porous layer thickness of the high-flux tube is in the range of 0.20~0.40mm, and the porosity of the porous layer is in the range of 20%~50%, which can increase the heat exchange area and improve the heat exchange efficiency.

[0013] As a preferred solution, automatic regulating valves are arranged on the desalted water pipeline, the dosing pipeline and the steam pipeline, and are controlled by the liquid level transmitter through a fixed value.

[0014] As a preferred solution, a remotely operated instrument switch valve is provided on the sewage pipeline, and sewage is discharged intermittently at regular intervals through a DCS control system.

[0015] As a preferred solution, remotely operated instrument switch valves are provided at the outlets of the steam pipe and the vent pipe, and the operation can be switched through the DCS control system.

[0016] The beneficial effects of the utility model are:

[0017] By adopting a high-efficiency heat exchange tube, the heat exchange area can be effectively increased. The desalted water can be heated by the process waste heat to generate steam, which can be effectively recycled. This not only reduces the circulating water consumption of chemical production equipment, but the by-product low-grade steam can be used as a heat source for the production of the equipment or to drive power equipment.

[0018] By recovering process waste heat through the steam generator, the process material temperature is cooled to the target temperature without consuming circulating cooling water, effectively reducing the plant's energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the utility model.

[0020] In the figure: 1. steam generator; 101. left end cover; 102. shell; 103. right end cover; 2. heat exchange tube; 3. demister; 4. drug injector; 5. liquid level transmitter; 6. temperature transmitter; 7. pressure transmitter; 8. silencer; 9. process material feed pipe; 10. process material discharge pipe; 11. desalted water pipeline; 12. dosing pipeline; 13. sewage pipeline; 14. safety valve; 15. steam pipeline; 16. vent pipeline. DETAILED DESCRIPTION

[0021] The utility model is further described in detail below based on the accompanying drawings and specific embodiments.

[0022] Example 1

[0023] A steam generating device for recovering waste heat from a low-temperature process comprises a steam generator 1, wherein the steam generator 1 comprises a left head 101, a shell 102 and a right head 103, wherein the left head 101 and the right head 103 are connected via a heat exchange tube 2, wherein a shell-and-tube structure is formed between the heat exchange tube 2 and the shell 102, wherein the interior of the shell 102 is a shell side, and the interior of the heat exchange tube 2 is a tube side, wherein a desalted water pipeline 11 is arranged at the bottom of the shell 102, and a demister 3 is arranged at an opening at the top of the shell 102, wherein the demister 3 is connected to a steam pipeline 15; a process material feed pipe 9 is arranged at the top of the left head 101, and a process material discharge pipe 10 is arranged at the bottom of the right head 103.

[0024] A drug adding pipeline 12 is also provided at the bottom of the shell 102 , and the drug adding pipeline 12 is connected to the drug injector 4 .

[0025] Liquid level transmitters 5 are arranged on the left and right sides of the outer wall of the housing 102, and a temperature transmitter 6 and a pressure transmitter 7 are arranged on the top.

[0026] The demister 3 is also provided with a safety pipe in parallel with the steam pipe 15 , and a safety valve 14 and a muffler 8 are provided on the safety pipe.

[0027] The steam pipe 15 is connected in parallel with a vent pipe 16 , and a muffler 8 is provided on the vent pipe 16 .

[0028] A sewage pipe 13 is also provided at the bottom of the shell 102 .

[0029] Furthermore, the heat exchange tube 2 is a metal sintered flux tube, the base tube is a high-grade cold-drawn seamless steel tube, the porous layer thickness of the high-flux tube is in the range of 0.20~0.40mm, and the porosity of the porous layer is in the range of 20%~50%, which can increase the heat exchange area and improve the heat exchange efficiency.

[0030] Furthermore, automatic regulating valves are provided on the desalted water pipeline 11 and the dosing pipeline 12 , and are controlled by the liquid level transmitter 5 through a fixed value.

[0031] Furthermore, a remotely operated instrument switch valve is provided on the sewage pipe 13, and sewage is discharged intermittently at regular intervals through the DCS control system.

[0032] Furthermore, remotely operated instrument switch valves are provided at the outlets of the steam pipe 15 and the vent pipe 16, and the operation can be switched by the DCS control system.

[0033] Example 2

[0034] The device described in Example 1 is used, and the process material (100-150°C) enters the left head 101 of the steam generator 1 through the process material feed pipe 9, flows through the heat exchange tube 2 and is discharged from the process material discharge pipe 10 of the right head 103. While the process material is introduced into the tube side, the desalted water (about 100°C) is introduced into the shell from the desalted water pipeline 11 to exchange heat with the heat exchange tube 2 to form low-grade steam. At the same time, the drug injector 4 sprays phosphate solution to improve the steam quality, and then the steam passes through the demister 3 to filter out the moisture in the steam and is discharged to the next process through the steam pipeline 15; the temperature transmitter 6 and the pressure transmitter 7 monitor the steam parameters, and the liquid level transmitter 5 monitors the liquid level in the shell side and controls the automatic regulating valves of the desalted water pipeline 11 and the drug adding pipeline 12. In order to reduce the noise pollution on site, a muffler 8 is provided on the venting pipeline 16 and the safety pipeline; the device can reduce the temperature of the process material and produce low-grade steam as a by-product.

Claims

1. A steam generating device for recovering waste heat from a low temperature process, characterized in that: The steam generator (1) comprises a left end cap (101), a shell (102) and a right end cap (103); the left end cap (101) and the right end cap (103) are connected via a heat exchange tube (2); a shell-and-tube structure is formed between the heat exchange tube (2) and the shell (102); the inside of the shell (102) is a shell side, and the inside of the heat exchange tube (2) is a tube side; a desalted water pipeline (11) is arranged at the bottom of the shell (102); a demister (3) is arranged at a hole at the top of the shell (102); and a steam pipeline (15) is connected to the demister (3); a process material feed pipe (9) is arranged at the top of the left end cap (101); and a process material discharge pipe (10) is arranged at the bottom of the right end cap (103).

2. A steam generating device for recovering waste heat from a low-temperature process according to claim 1, characterized in that: A drug adding pipeline (12) is also provided at the bottom of the shell (102), and the drug adding pipeline (12) is connected to the drug injector (4).

3. The steam generating device for recovering waste heat from a low-temperature process according to claim 1, characterized in that: Liquid level transmitters (5) are arranged on the left and right sides of the outer wall of the shell (102), and a temperature transmitter (6) and a pressure transmitter (7) are arranged on the top.

4. The steam generating device for recovering waste heat from a low-temperature process according to claim 1, characterized in that: The demister (3) is also provided with a safety pipe in parallel with the steam pipe (15), and the safety pipe is provided with a safety valve (14) and a muffler (8).

5. The steam generating device for recovering waste heat from a low-temperature process according to claim 1, characterized in that: The steam pipe (15) is connected in parallel with a vent pipe (16), and a muffler (8) is provided on the vent pipe (16).

6. The steam generating device for recovering waste heat from a low-temperature process according to claim 1, characterized in that: A sewage discharge pipe (13) is also provided at the bottom of the shell (102).

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