TWM679504U - Gas heat recovery and solvent interception system - Google Patents

Abstract

This invention relates to a gas heat recovery and solvent interception system, comprising a high-temperature gas waste heat recovery module, a solvent-containing gas collection, concentration, and condensation module, at least one gas delivery pipe, and a filtration unit. The high-temperature gas waste heat recovery module and the solvent-containing gas collection, concentration, and condensation module can simultaneously and effectively improve energy efficiency and suppress the emission of volatile organic compounds from process equipment into the atmosphere. This invention utilizes a closed-loop high-temperature gas delivery path to introduce the high-temperature inert gas (such as nitrogen) used in the process into the heat exchange unit for waste heat recovery, which is used to preheat fresh nitrogen or other process gases. This invention guides gases containing volatile organic solvents to a concentration and condensation unit, where efficient condensation allows for effective solvent recovery or centralized treatment, reducing environmental emissions. The system can be configured with automatic switching valves, concentration sensors, and energy-saving control algorithms to achieve the dual benefits of dynamic thermal management and pollution source control, making it suitable for gas treatment applications in industries such as electronics, chemicals, coating, and drying.

Description

Gas heat recovery and solvent interception system

This invention relates to a gas heat recovery and solvent interception system, particularly its application in the heat recovery and volatile organic compound (VOC) recovery of high-temperature exhaust gas. It integrates heat exchange, condensation and concentration, filtration and closed-loop nitrogen reuse technologies, belonging to the field of combined energy recovery and pollution control applications.

As the electronics, chemical, and precision coating industries place increasingly stringent requirements on process environments, the application of high-purity nitrogen in processes such as drying, baking, and inert atmosphere protection is becoming more widespread. These processes typically involve the large-scale supply and emission of high-temperature nitrogen, accompanied by environmental risks from the release of volatile organic compounds (VOCs).

Existing traditional systems typically focus on solving only a single problem. For example, they may simply heat nitrogen and release it directly into the atmosphere, resulting in energy waste, or they may install separate adsorption towers or incinerators only for volatile organic compound (VOC) emissions, which are both space-consuming and energy-intensive. These various structural configurations usually cause at least the following problems:

1. Low energy efficiency: The thermal energy of high-temperature nitrogen gas is not effectively recovered and utilized.

2. High pollution control costs: Volatile solvents can only be treated through energy-intensive incineration.

3. The equipment is complex and large: each processing module exists independently and lacks integration.

For related prior art, please refer to Taiwan Patent TW201924761A, which proposes a "collector assembly and system for capturing polymer vapor in a vacuum system of a treatment furnace". This system utilizes a condenser and condensation chamber structure to condense and collect polymer vapor in a liquid storage tank, preventing it from accumulating in the vacuum pump and piping. While this technology can effectively capture vapor in a vacuum system, it has at least the following problems:

1. It is only suitable for vacuum environments and cannot be used in atmospheric pressure or closed-loop systems.

2. It only has a single condensation capture function and lacks an energy recovery mechanism.

3. Lack of coordinated design for multi-stage heat exchange and condensation.

4. Lack of intelligent control and nitrogen reuse.

Therefore, existing technologies still cannot simultaneously achieve high-temperature nitrogen heat recovery and multi-stage pollutant recovery, and lack closed-loop operation and intelligent control design, which is a problem that the industry urgently needs to solve.

In view of the above, the purpose of this invention is to recover the waste heat of high-temperature nitrogen and use it to preheat fresh gas or other process media, so as to reduce the consumption of gas and electricity.

Another objective of this invention is to intercept and recover volatile solvents that escape during the manufacturing process, enabling them to be reused or centrally treated, thereby reducing the energy burden of waste gas treatment and reducing pollution to the atmospheric environment.

Another objective of this invention is to combine a high-temperature gas waste heat recovery module and a solvent-containing gas collection and concentration/condensation module to form a smart-controlled closed-loop system, which can achieve the following advantages:

1. Dual energy-saving effect: It can save energy through heat recovery and pollution treatment.

2. Reduce emissions: Comply with increasingly stringent environmental regulations.

3. Improve equipment utilization: The integrated design can reduce the space and area occupied, and improve the ease of operation and maintenance.

To achieve the above objectives, this invention provides a gas heat recovery and solvent interception system, comprising a high-temperature gas waste heat recovery module, a solvent-containing gas collection, concentration, and condensation module, at least one gas supply pipe, and a filtration unit. The high-temperature gas waste heat recovery module includes a gas inlet and a heat exchange unit. The gas inlet is connected to a process equipment to introduce the high-temperature gas discharged from the process equipment. Cold gas can be introduced into one side of the heat exchange unit and heat exchanged to form preheated gas. This preheated gas can be discharged from the other side of the heat exchange unit and introduced into a gas heater to be heated to the target temperature before being introduced into the process equipment. The solvent-containing gas collection, concentration, and condensation module is configured on one side of the high-temperature gas waste heat recovery module. The condensation module includes a condensation unit and a solvent-containing gas collection unit. The condensation unit can be supplied with cooling water and discharged after condensing and condensing high-temperature gas. The solvent contained in the high-temperature gas after condensation and condensation is collected by the solvent-containing gas collection unit. At least one gas supply pipe is configured between the heat exchange unit, the condensation unit, and the solvent-containing gas collection unit. In the unit, one end of the gas supply pipe is connected to the gas inlet, and the other end of the gas supply pipe is connected to the solvent-containing gas collection unit. The gas supply pipe is used to transport the high-temperature gas discharged from the process equipment. One end of the filtration unit is correspondingly connected to the other end of the gas supply pipe, and the other end of the filtration unit is connected to a vacuum pump, which uses the vacuum pump to return the cooling gas discharged from the other end of the gas supply pipe to the process.

This invention utilizes a closed-loop high-temperature gas transport path to introduce high-temperature inert gases (such as nitrogen) used in the process into a heat exchange unit for waste heat recovery. This waste heat is used to preheat fresh nitrogen or other process gases. At the same time, gases containing volatile organic solvents are guided to a concentration and condensation unit. Through efficient condensation, the solvents are effectively recovered or centrally treated, reducing the environmental emission burden.

This invention can be configured with automatic switching valves, concentration sensors and energy-saving control algorithms according to process requirements to achieve the dual benefits of dynamic thermal energy management and pollution source control. It is suitable for gas treatment applications in industries such as electronics, chemicals, coating and drying.

Based on the aforementioned advantages, and in order to enable the review committee to further understand this work, the preferred implementation method is disclosed below, with accompanying diagrams and figures, to explain in detail the composition of this work and the effects it achieves.

The following are specific examples illustrating the implementation of this invention. Those familiar with this technique can easily understand the other advantages and effects of this invention from the content revealed in this manual. In addition, this invention can also be implemented or applied through other different specific examples, with various modifications and changes made without departing from the spirit of this invention.

As shown in Figure 1, this invention provides a gas heat recovery and solvent interception system, which includes a high-temperature gas waste heat recovery module 10, a solvent-containing gas collection, concentration and condensation module 20, at least one gas delivery pipe 30, and a filtration unit 40, which will be described in detail below.

The high-temperature gas waste heat recovery module 10 includes a gas inlet 11 and a heat exchange unit 12. The gas inlet 11 is connected to a process equipment 111 to introduce the high-temperature gas discharged from the process equipment 111. One side of the heat exchange unit 12 can introduce cold gas and perform heat exchange to form preheated gas. The preheated gas can be discharged from the other side of the heat exchange unit 12 and introduced into a gas heater 121 to be heated to the target temperature, and then introduced into the process equipment 111.

The solvent-containing gas collection and concentration/condensation module 20 is disposed on one side of the high-temperature gas waste heat recovery module 10. The solvent-containing gas collection and concentration/condensation module 20 includes a concentration/condensation unit 21 and a solvent-containing gas collection unit 22. The concentration/condensation unit 21 can be introduced with cooling water and discharged after the high-temperature gas is concentrated and condensed. The solvent contained in the high-temperature gas after concentration and condensation is collected by the solvent-containing gas collection unit 22.

At least one gas delivery pipe 30 is disposed in the heat exchange unit 12, the concentration and condensation unit 21, and the solvent-containing gas collection unit 22. One end of the gas delivery pipe 30 is connected to the gas inlet 11, and the other end of the gas delivery pipe 30 is connected to the solvent-containing gas collection unit 22. The gas delivery pipe 30 is used to transport the high-temperature gas discharged from the process equipment 111.

One end of the filtration unit 40 is connected to the other end of the gas supply pipe 30, and the other end of the filtration unit 40 is connected to a vacuum pump 50, which uses the vacuum pump 50 to return the cooling gas discharged from the other end of the gas supply pipe 30 to the process.

In one embodiment of this invention, the high-temperature gas waste heat recovery module 10, the solvent-containing gas collection, concentration and condensation module 20, and the gas transmission pipe 30 are made of stainless steel or high-temperature alloy pipe.

This ensures gas purity and meets dust-free requirements.

In one embodiment of this invention, the heat exchange unit 12 has a detachable structure.

Therefore, it is beneficial for cleaning and maintenance.

In one embodiment of this invention, a control unit is further included, which is connected to a concentration sensor and an automatic switching valve to automatically adjust the airflow path and operating mode based on gas concentration data.

The above is an introduction to the implementation examples of this invention. The features and effects of this invention will then be introduced as follows:

High-temperature gas waste heat recovery module 10:

1. Installed at the exhaust end of the process equipment 111 to guide out high-temperature nitrogen or other gases.

2. Heat energy is transferred to fresh nitrogen inlet route a (for preheating) through heat exchange unit 12, or to air inlet preheating zone b of process equipment 111, reducing the heating burden.

Solvent-containing gas collection, concentration, and condensation module 20:

1. Nitrogen or other inert gases generated during the manufacturing process may contain volatile organic compounds (VOCs).

2. Guide to the condensation and cooling unit 21 for processing.

3. The concentrated and condensed organic solvent is then introduced into the solvent-containing gas collection unit 22 for centralized recovery, reducing external emissions.

This creation has at least the following advantages:

1. Energy efficiency: By recovering the heat energy of high-temperature nitrogen through heat exchange, the energy consumption for heating fresh nitrogen can be reduced, resulting in high energy efficiency.

2. Pollution control: Condensation and filtration can effectively recover solvents and remove solids, reducing the concentration of VOCs in exhaust gas.

3. Resource recycling: The closed-loop nitrogen design reduces nitrogen consumption and avoids direct emissions, meeting the requirements of green processes.

4. Intelligent control: The operating mode is dynamically switched according to the process requirements, taking into account both minimizing energy consumption and maximizing pollutant recovery.

5. Convenient maintenance: The modular structure allows for disassembly and maintenance, extending equipment life and reducing maintenance costs.

The above embodiments are merely illustrative examples for the purpose of explanation. The scope of the rights claimed in this work shall be based on the scope of the patent application, and not limited to the above embodiments.

10: High-temperature gas waste heat recovery module 11: Gas inlet 111: Process equipment 12: Heat exchange unit 121: Gas heater 20: Solvent-containing gas collection and concentration/condensation module 21: Concentration/condensation unit 22: Solvent-containing gas collection unit 30: Gas delivery pipe 40: Filtration unit 50: Vacuum pump a: Fresh nitrogen inlet route b: Inlet air preheating zone

Figure 1 is a schematic diagram of the composition of this work.

10: High-temperature gas waste heat recovery module

11: Gas Inlet

111: Process Equipment

12: Heat Exchanger Unit

121: Gas heater

20: Solvent-containing gas collection, concentration, and condensation module

21: Concentrated Condensation Unit

22: Solvent-containing gas collection unit

30: Gas pipe

40: Filtration Unit

50: Vacuum Pump

a: Fresh nitrogen intake route

b: Air intake preheating zone

Claims (4)

A gas heat recovery and solvent interception system includes: a high-temperature gas waste heat recovery module, comprising a gas inlet and a heat exchange unit. The gas inlet is connected to a process device for introducing high-temperature gas discharged from the process device. One side of the heat exchange unit can introduce cold gas and exchange heat with it to form preheated gas. The preheated gas can be discharged from the other side of the heat exchange unit and introduced into a gas heater for heating to a target temperature before being introduced into the process device. A solvent-containing gas collection and concentration/condensation module is configured on one side of the high-temperature gas waste heat recovery module. This module includes a concentration/condensation unit and a solvent-containing gas collection unit. The concentration/condensation unit can be supplied with cooling water and discharged after concentrating and condensing the high-temperature gas. The solvent contained in the high-temperature gas after concentration and condensation is collected by the solvent-containing gas collection unit. At least one gas delivery pipe is configured in the heat exchange unit, the concentration and condensation unit, and the solvent-containing gas collection unit. One end of the gas delivery pipe is connected to the gas inlet, and the other end of the gas delivery pipe is connected to the solvent-containing gas collection unit. The gas delivery pipe is used to transport the high-temperature gas discharged from the process equipment. A filtration unit is connected at one end to the other end of the gas delivery pipe. The other end of the filtration unit is connected to a vacuum pump, which returns the cooling gas discharged from the other end of the gas delivery pipe to the process unit. The gas heat recovery and solvent interception system as described in claim 1, wherein the high-temperature gas waste heat recovery module, the solvent-containing gas collection and concentration condensation module, and the gas transmission pipe are made of stainless steel or high-temperature alloy pipe. The gas heat recovery and solvent interception system as described in claim 1, wherein the heat exchange unit is a detachable structure. The gas heat recovery and solvent interception system as described in claim 1 further includes a control unit connected to a concentration sensor and an automatic switching valve to automatically adjust the gas flow path and operating mode based on gas concentration data.