Energy-saving optimization equipment applied to VOCs tail gas adsorption and desorption process
By setting up a heat exchange box and a coiled copper tube in the VOCs tail gas adsorption and desorption process, the heat exchange between the high-temperature circulating gas and the low-temperature non-condensable gas is utilized, which solves the problems of low cooling efficiency of high-temperature circulating gas and long heating time of low-temperature non-condensable gas, achieving energy-saving optimization, reducing operating costs and improving heat utilization efficiency.
Patent Information
- Application Number
- CN202520453963.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-14
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2035-03-14
AI Technical Summary
In existing VOCs tail gas adsorption and desorption processes, the high-temperature circulating gas directly enters the cryogenic tower for cooling, which is inefficient and energy-intensive. The long heating time for low-temperature non-condensable gas leads to high heater energy consumption, resulting in an overall increase in energy consumption.
A heat exchange box is installed between the circulating gas pipe and the non-condensable gas pipe, and first and second coiled copper pipes are installed inside the box in close contact. The heat exchange between the high-temperature circulating gas and the low-temperature non-condensable gas is utilized to reduce the heat power of the heater and the cryogenic machine by using the waste heat and cold energy of the gas itself. At the same time, an insulation layer is installed inside the heat exchange box to improve the heat conversion efficiency.
It reduces the operating cost of solvent recovery, improves the economic benefits of VOCs solvent recovery, and enhances heat utilization efficiency through pre-cooling and pre-heating processes, thereby reducing the energy consumption of heaters and cryogenic machines.
Smart Images
Figure CN223861599U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to VOCs tail gas treatment technical field, concretely relates to a kind of energy-saving optimization equipment applied to VOCs tail gas adsorption and desorption process. BACKGROUND
[0002] VOCs (volatile organic compounds) volatile organic compounds, it is the organic compound at 50~260 ℃ below and initial boiling point equal to 250 degrees Celsius under the condition of the saturated vapor pressure greater than 70.91Pa, standard atmospheric pressure 101.3kPa under the condition of boiling point at room temperature, or any volatile organic solid or liquid at room temperature and normal pressure.
[0003] At present, the existing VOCs tail gas adsorption and desorption process, in the process of use, the high-temperature circulating gas of desorption is directly introduced into the deep cooling tower, and is cooled, since the temperature of circulating gas is high, directly introduced into the deep cooling tower, the deep cooling tower needs to be cooled for a long time, which greatly reduces the efficiency of deep cooling, and increases the energy consumption of deep cooling machine, and the low-temperature incondensable gas recovered by condensation is introduced into the heater for circulating desorption, since the temperature of incondensable gas is low, it needs a long time to heat, which increases the energy consumption of heater, therefore, we propose a kind of energy-saving optimization equipment applied to VOCs tail gas adsorption and desorption process. UTILITY MODEL CONTENT
[0004] The utility model aims at providing a kind of energy-saving optimization equipment applied to VOCs tail gas adsorption and desorption process to solve the problems existing in the above background technology.
[0005] To achieve the above object, the utility model provides the following technical scheme: a kind of energy-saving optimization equipment applied to VOCs tail gas adsorption and desorption process, including activated carbon tank, heat exchange box and deep cooling tower, the top of the activated carbon tank is provided with circulating gas pipe, the end of the circulating gas pipe extends to the inside top of deep cooling tower and is sealed with it Communication, the activated carbon tank is communicated with the deep cooling tower by the circulating gas pipe being equipped, the activated carbon tank and the deep cooling tower are also provided with heater, the deep cooling tower bottom end side is provided with incondensable gas pipe, the end of the incondensable gas pipe extends to the heater and is sealed with its inside communication, the middle part of the circulating gas pipe and incondensable gas pipe is provided with heat exchange box, the circulating gas pipe and incondensable gas pipe all pass through the inside of heat exchange box, the inside of heat exchange box is spirally provided with first spirally copper pipe and second spirally copper pipe, the first spirally copper pipe and second spirally copper pipe are in close contact, the both ends of the circulating gas pipe and first spirally copper pipe are sealed with it Communication, the both ends of the incondensable gas pipe and second spirally copper pipe are sealed with it Communication.
[0006] Preferably, the shell of the heat exchange box is internally provided with a heat insulation layer fixedly filled in the shell of the heat exchange box.
[0007] Preferably, the air outlet end of the heater is provided with an air guide pipe, and the tail end of the air guide pipe extends to the internal bottom end of the activated carbon tank.
[0008] Preferably, one side of the deep cooling tower is provided with a deep cooling machine, and the liquid outlet end and the liquid inlet end of the deep cooling machine are in communication with the internal top end and the bottom end of the deep cooling tower, respectively.
[0009] Preferably, one end of the heater is provided with an air inlet pipe, and one end of the air inlet pipe is in sealed communication with the air inlet end of the heater.
[0010] Preferably, the air guide pipe, the circulating gas pipe and the non-condensable gas pipe are all internally provided with valve bodies.
[0011] Compared with the prior art, the utility model has the beneficial effects that:
[0012] 1. By setting the heat exchange box in the middle of the circulating gas pipe and the non-condensable gas pipe, and setting the first spiral copper pipe and the second spiral copper pipe in close contact with each other in the heat exchange box, and connecting the two pipes to the circulating gas pipe and the non-condensable gas pipe, respectively, the high-temperature circulating gas detached and the low-temperature non-condensable gas recovered through condensation are used for heat exchange, the heat power of the heater and the deep cooling machine group is reduced through the self-heat and cold of the material flow, thereby the operation cost of solvent recovery is reduced, and the economic benefit of VOCs solvent recovery is improved.
[0013] 2. By setting the heat insulation layer in the shell of the heat exchange box, the heat loss in the heat exchange box is avoided, the heat conversion efficiency between the first spiral copper pipe and the second spiral copper pipe is not affected, and the heat exchange efficiency between the circulating gas and the non-condensable gas is maximized. BRIEF DESCRIPTION OF DRAWINGS
[0014] Fig. 1 It is a whole structure schematic view of the utility model;
[0015] Fig. 2 It is a heat exchange box structure schematic view of the utility model;
[0016] Fig. 3 It is a first spiral copper pipe and a second spiral copper pipe structure schematic view of the utility model.
[0017] In the drawing: 1, activated carbon tank; 2, heater; 3, air inlet pipe; 4, air guide pipe; 5, circulating gas pipe; 6, heat exchange box; 7, deep cooling tower; 8, deep cooling machine; 9, non-condensable gas pipe; 10, first spiral copper pipe; 11, second spiral copper pipe; 12, heat insulation layer. DETAILED DESCRIPTION
[0018] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of the present application.
[0019] Please refer to Figs. 1-3 The utility model provides a kind of energy-saving optimization equipment technical scheme applied to VOCs tail gas adsorption and desorption process: including activated carbon tank 1, heat exchange box 6 and deep cooling tower 7, the top of activated carbon tank 1 is provided with circulating gas pipe 5, the end of circulating gas pipe 5 extends to the inside top of deep cooling tower 7 and is sealed with it Communication, activated carbon tank 1 and deep cooling tower 7 are communicated by the circulating gas pipe 5 being equipped, activated carbon tank 1 and deep cooling tower 7 are also provided with heater 2, deep cooling tower 7 bottom end side is provided with non-condensable gas pipe 9, the end of non-condensable gas pipe 9 extends to heater 2 and is sealed with its inside communication, the middle part of circulating gas pipe 5 and non-condensable gas pipe 9 is provided with heat exchange box 6, circulating gas pipe 5 and non-condensable gas pipe 9 all pass through the inside of heat exchange box 6, the inside of heat exchange box 6 is spirally provided with first spiral copper pipe 10 and second spiral copper pipe 11, first spiral copper pipe 10 and second spiral copper pipe 11 are in close contact, circulating gas pipe 5 and the both ends of first spiral copper pipe 10 are sealed with it Communication, non-condensable gas pipe 9 and the both ends of second spiral copper pipe 11 are sealed with it Communication.
[0020] Specifically, the inside of the shell of heat exchange box 6 is provided with heat insulation layer 12, and the heat insulation layer 12 is fixedly filled in the inside of the shell of heat exchange box 6.
[0021] Specifically, the gas outlet end of heater 2 is provided with gas guide pipe 4, and the end of gas guide pipe 4 extends to the inside bottom end of activated carbon tank 1.
[0022] Specifically, one side of deep cooling tower 7 is provided with deep cooling machine 8, and the liquid outlet end and the liquid inlet end of deep cooling machine 8 are respectively communicated with the inside top end and the inside bottom end of deep cooling tower 7.
[0023] Specifically, one end of heater 2 is provided with air inlet pipe 3, and one end of air inlet pipe 3 is sealed with the air inlet end of heater 2.
[0024] Specifically, valve bodies are arranged in gas guide pipe 4, circulating gas pipe 5 and non-condensable gas pipe 9.
[0025] In this implementation plan, the workshop exhaust gas, after being treated by the front-end pretreatment system for dust and impurity removal, cooling and dehumidification, enters the activated carbon tank 1 for adsorption and desorption. Once the activated carbon tank 1 is saturated with adsorption, it needs to be switched to desorption mode. Nitrogen gas is then injected into the heater 2 and heated to approximately 200 degrees Celsius. This nitrogen gas is then injected into the activated carbon tank 1 through the gas guide pipe 4 for desorption treatment. The desorbed VOCs circulating gas passes through the circulating gas pipe 5, through the first spiral copper tube 10 in the heat exchange box 6, and is introduced into the cryogenic tower 7. The cryogenic compressor 8 performs deep cooling into the cryogenic tower 7, reducing the temperature of the circulating gas to below 10 degrees Celsius, allowing most solvent molecules to condense and be recovered. Non-condensable gases return through the non-condensable gas pipe 9 and the second spiral copper tube 11 in the heat exchange box 6. Returning to heater 2, the circulating desorption process continues. During this process, the high-temperature circulating gas in the circulating gas pipe 5 dissipates heat to the interior of the heat exchange box 6 as it passes through the first spiral copper pipe 10. Simultaneously, the low-temperature non-condensable gas in the non-condensable gas pipe 9 absorbs heat from the interior of the heat exchange box 6 as it passes through the second spiral copper pipe 11. This allows the high-temperature circulating gas to undergo pre-cooling before entering the cryogenic tower 7, while the low-temperature non-condensable gas undergoes pre-heating by absorbing heat from the heat exchange box 6 before entering heater 2. This achieves both pre-cooling of the high-temperature circulating gas and pre-heating of the low-temperature non-condensable gas. By utilizing the waste heat and cooling capacity of the gas itself, the thermal power of heater 2 and cryogenic tower 8 is reduced, the operating cost of solvent recovery is reduced, and the economic benefits of VOCs solvent recovery are improved.
[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. An energy-saving optimization device for VOCs tail gas adsorption and desorption processes, comprising an activated carbon tank (1), a heat exchange box (6), and a cryogenic tower (7), characterized in that: The activated carbon tank (1) is provided with a circulating gas pipe (5) at its top. The end of the circulating gas pipe (5) extends to the top of the cryogenic tower (7) and is sealed to it. The activated carbon tank (1) and the cryogenic tower (7) are connected by the circulating gas pipe (5). A heater (2) is also provided between the activated carbon tank (1) and the cryogenic tower (7). A non-condensable gas pipe (9) is provided on one side of the bottom of the cryogenic tower (7). The end of the non-condensable gas pipe (9) extends into the heater (2) and is sealed to it. A heat exchange box (6) is provided in the middle of the circulating gas pipe (5) and the non-condensable gas pipe (9). Both the circulating gas pipe (5) and the non-condensable gas pipe (9) pass through the interior of the heat exchange box (6). A first spiral copper pipe (10) and a second spiral copper pipe (11) are spirally arranged inside the heat exchange box (6). The first spiral copper pipe (10) and the second spiral copper pipe (11) are in close contact. The two ends of the circulating gas pipe (5) and the first spiral copper pipe (10) are sealed and connected. The two ends of the non-condensable gas pipe (9) and the second spiral copper pipe (11) are sealed and connected.
2. The energy-saving optimization equipment for VOCs tail gas adsorption and desorption processes according to claim 1, characterized in that: The heat exchange box (6) has an insulation layer (12) inside its shell, and the insulation layer (12) is fixedly filled inside the shell of the heat exchange box (6).
3. The energy-saving optimization equipment for VOCs tail gas adsorption and desorption processes according to claim 1, characterized in that: The heater (2) is provided with a gas guide pipe (4) at the gas outlet end, and the end of the gas guide pipe (4) extends to the bottom of the activated carbon tank (1).
4. The energy-saving optimization equipment for VOCs tail gas adsorption and desorption processes according to claim 1, characterized in that: A cryogenic machine (8) is provided on one side of the cryogenic tower (7), and the liquid outlet end and liquid inlet end of the cryogenic machine (8) are respectively connected to the top and bottom of the cryogenic tower (7).
5. The energy-saving optimization equipment for VOCs tail gas adsorption and desorption processes according to claim 1, characterized in that: One end of the heater (2) is provided with an air inlet pipe (3), and one end of the air inlet pipe (3) is sealed and connected to the air inlet end of the heater (2).
6. The energy-saving optimization equipment for VOCs tail gas adsorption and desorption processes according to claim 3, characterized in that: Valve bodies are installed in the air guide pipe (4), the circulating air pipe (5), and the non-condensable air pipe (9).