An intermittent production device breathing exhaust gas utilization process and system

Abstract

The application discloses an intermittent production device breathing exhaust gas utilization process and system, and belongs to the technical field of waste gas treatment. The system comprises an exhalation gas collecting main pipe, an inhalation return main pipe, a first buffer tank, a second buffer tank and a bottom communication pipe. The first buffer tank is filled with a buffer liquid and is provided with a sealable isolation piece that can move up and down, and the second buffer tank is a closed container and is filled with inert gas. When the production equipment feeds, the exhalation gas enters the first buffer tank, pushes the buffer liquid into the second buffer tank to compress the inert gas to realize energy storage. When the production equipment discharges, the compressed inert gas expands, pushes the buffer liquid back to the first buffer tank, and the stored exhalation gas is pushed back to the production equipment. The application utilizes the original power of the feeding pump to realize the non-powered recycling of the breathing gas, is suitable for positive pressure and negative pressure working conditions, has the advantages of zero emission, no additional energy consumption, wide application range, low investment and the like.

Description

Technical Field

[0001] This invention relates to the field of waste gas treatment and resource utilization technology, specifically to a recycling process and system for breathing waste gas during the feeding and unloading processes of intermittent production units. Background Technology

[0002] In the pharmaceutical, chemical, fine chemical, food processing, and brewing industries, batch production processes such as metering, batching, dissolving, mixing, reaction, and packaging are widely used. During operation, these production equipment (such as reaction vessels, storage tanks, metering tanks, batching tanks, and mixing tanks) experience changes in the volume of the internal gas phase space due to feeding and unloading operations, resulting in the exhalation and inhalation of gases. The specific mechanism is as follows: The cause of exhalation: When liquid or solid materials are added to a closed production device, the materials occupy the effective volume inside the device, causing the gas phase space inside the device to be compressed and the gas phase pressure to increase. To maintain pressure balance inside the device, the gas in the gas phase space above the device must be expelled; this process is called "exhalation." Exhaled gas usually contains volatile organic components, dust, or other pollutants from the materials, and direct emission would cause environmental pollution.

[0003] The cause of air intake: When production equipment discharges material, the volume of material inside the equipment decreases, the gas phase space increases, and the gas phase pressure decreases, creating a negative pressure. To maintain pressure balance inside the equipment, external gas must be drawn into the equipment; this process is called "air intake." If untreated air is drawn in, it may introduce oxygen, moisture, or impurities, which can adversely affect production safety (e.g., flammable and explosive materials) or product quality (e.g., oxidation, deterioration, moisture absorption, and agglomeration).

[0004] Characteristics of Breathing Gas: The exhaust or intake air that accompanies the alternating processes of feeding and unloading is collectively referred to as "breathing gas." The generation of breathing gas is directly related to production operations and is characterized by intermittency, periodicity, and a composition consistent with the materials within the equipment. Traditional treatment methods involve collecting the exhaled gas and processing it through environmental protection facilities such as activated carbon adsorption, carbon fiber adsorption and regeneration, and catalytic incineration before discharging it in compliance with standards. Intake gas, on the other hand, is directly introduced from outside air or inert gases.

[0005] Currently, the following technologies are mainly used for processing respiratory gases: (1) Activated carbon adsorption technology: This technology uses activated carbon as an adsorbent to adsorb harmful components in exhaled air, achieving harmless and compliant emissions. Most operating conditions employ a multi-stage activated carbon adsorber series connection process to ensure that the emitted gas meets emission standards. When a stage of the activated carbon adsorber becomes saturated, it is replaced with new activated carbon and then put back into operation. The saturated activated carbon is then sent to a qualified unit for incineration. This is currently the waste gas treatment method adopted by most enterprises. Activated carbon adsorption technology has the following drawbacks: a) Although compliant emissions are achieved after treatment, the emitted gas is still waste gas and still contains trace amounts of harmful substances; b) Activated carbon becomes saturated and needs frequent replacement. Saturated waste activated carbon needs to be outsourced for treatment, resulting in high operating costs; c) Activated carbon has a limited adsorption capacity and is easily saturated; if not detected in time, excessive emissions may occur.

[0006] (2) Carbon fiber adsorption / regeneration technology: A technology for treating "exhaled breath" by using carbon fiber as an adsorbent instead of activated carbon. Due to the high price of carbon fiber and the high operating temperature, it can be desorbed and regenerated by steam or electrically heated air. Therefore, an automatic switching process for adsorption and regeneration is generally adopted.

[0007] Adsorption process: Industrially, a three-stage carbon fiber adsorption tank series connection is generally used. The treated waste gas meets emission standards. When the first-stage adsorption tank becomes saturated, it automatically switches to the regeneration process. The second and third-stage adsorption tanks operate in series to ensure that the treated waste gas meets emission standards. The first stage then enters the regeneration process to regenerate the adsorbent.

[0008] Regeneration process: The carbon fibers in the carbon fiber adsorption tank are heated and desorbed using electrically heated hot air or superheated steam. The desorbed waste gas is then incinerated at high temperature in a catalytic incinerator. The incinerated waste gas is discharged together with the qualified waste gas after normal adsorption treatment. After regeneration, the first adsorption tank switches back to the adsorption system as a new third stage.

[0009] Although carbon fiber adsorbents have achieved online automatic monitoring, automatic operation, and automatic regeneration processes, they still have the following drawbacks: a) the regeneration process requires electrically heated air or superheated steam, resulting in high costs; b) a narrow range of applications. Because catalytic combustion catalysts are selective, their selectivity for some components is not high, leading to incomplete combustion and emissions failing to meet standards.

[0010] (3) Atmospheric Pressure Recovery Technology: For example, patent CN220647864U discloses a method for storing "breathing gas" generated during intermittent production under atmospheric pressure in an expandable inner liner (such as a large plastic bag) inside a gas storage tank after passing through a collection pipe and a washing tower. This gas is used as intake gas when the equipment unloads. When the production equipment is fed, the "breathing gas" fills the inner liner of the gas storage tank, the inner liner expands, and the air between the gas storage tank and the inner liner is squeezed out through the breather valve of the gas storage tank to expel the atmosphere. When the equipment unloads, the "breathing gas" is "inhaled," and the stored "breathing gas" returns from the inner liner to the equipment. The inner liner shrinks accordingly, the pressure between the gas storage tank and the inner liner decreases, and the atmosphere naturally enters from the breather valve between the gas storage tank and the inner liner to replenish the pressure, automatically achieving pressure balance inside and outside the inner liner. The "breathing gas" is recycled throughout the process, achieving zero emissions of waste gas. However, this technology is only applicable to atmospheric pressure conditions and cannot be applied to production equipment under positive or negative pressure conditions.

[0011] In summary, existing technologies lack a recycling solution that can achieve zero emissions, low energy consumption, and wide applicability for the breathing gas of intermittent production devices under pressure conditions (positive or negative pressure). Summary of the Invention

[0012] The technical solution adopted by this invention to solve the technical problem is as follows: The present invention aims to solve the technical problems of high cost, high energy consumption and inability to achieve zero emissions in the treatment of breathing gas in intermittent production devices under pressure conditions in the prior art, and provides a breathing waste gas recycling process and system that does not require additional power and is suitable for positive and negative pressure conditions. Technical solution

[0013] To achieve the above objectives, the present invention provides the following technical solution: A system for utilizing breathing exhaust gas from an intermittent production unit, comprising: The exhalation collection manifold is connected to the exhalation branch of at least one intermittent production equipment to receive the exhaled gas (waste gas) discharged when the production equipment is fed. The inspiratory return manifold is connected to the inspiratory branch of at least one intermittent production device to return stored expiratory air to the production device. The first buffer tank is connected at its top to the exhalation collection manifold and the inhalation return manifold, respectively, and is used to store exhaled air; the first buffer tank is filled with buffer solution, and a sealing isolator that can move up and down is provided above the buffer solution. The second buffer tank is a sealed container filled with inert gas; the bottom of the second buffer tank is connected to the bottom of the first buffer tank through a connecting pipe, allowing the buffer solution to flow bidirectionally between the two buffer tanks. It also includes: an exhalation branch valve installed on the exhalation branch of each production device, and an inhalation branch valve installed on the inhalation branch of each production device, used to realize the switching control of exhalation collection and inhalation return; that is, an exhalation branch valve is provided between the exhalation branch of each production device and the exhalation collection main pipe, so that "exhalation" can flow unidirectionally between the production device and the exhalation collection main pipe; an inhalation branch valve is provided between the inhalation branch of each production device and the inhalation return main pipe, so that "inhalation" can flow unidirectionally between the inhalation return main pipe and the production device.

[0014] The feed valve of each production unit and the exhalation branch valve on the exhalation branch of the same unit form an interlocked control that opens and closes simultaneously; the discharge valve of each production unit and the inhalation branch valve on the inhalation branch of the same unit form an interlocked control that opens and closes simultaneously.

[0015] As an optional optimization, when processing powder or fragile solid granular materials, a gas-solid separation device is installed at the front end of the exhalation collection manifold; when processing gas containing mist, a gas-liquid separation device is installed at the front end of the exhalation collection manifold; when processing gases that are prone to self-aggregation or sticking to the wall, a gas scrubbing device is installed at the front end of the exhalation collection manifold.

[0016] Based on the above system, the present invention also provides a process for utilizing respiratory waste gas, comprising the following steps: Exhalation collection and energy storage steps: When the production equipment is fed, the feed valve of the production equipment and the exhalation branch valve on the exhalation branch pipe of the equipment are opened simultaneously. The exhaled air in the production equipment enters the top of the first buffer tank through the exhalation collection main pipe, pushing the sealing isolation component downward. At the same time, part of the buffer solution is forced into the second buffer tank through the bottom connecting pipe, compressing the inert gas in the second buffer tank and increasing the pressure. After the feeding is completed, the exhaled air is stored in the upper part of the first buffer tank, and the system pressure reaches the highest point. Inhalation return and energy release steps: When the production equipment unloads, the unloading valve and the inhalation branch valve on the equipment's inhalation branch pipe open simultaneously. The compressed inert gas in the second buffer tank expands, pushing the buffer solution back to the first buffer tank through the bottom connecting pipe. At the same time, it pushes the sealing isolation component upward, pushing the exhaled air stored at the top of the first buffer tank back to the production equipment through the inhalation return main pipe. After unloading is completed, the system returns to the initial pressure.

[0017] In the above process, the exhalation collection and compression process utilizes the power of the feed pump of the production equipment as the energy source, requiring no additional power input; the inhalation return process utilizes the expansion energy of the compressed inert gas in the second buffer tank, also requiring no additional power. When there are several production processes with different pressure levels within the same production unit, by installing a system described in this invention at each pressure level process, zero emissions of "breathing gas" from the entire production unit can be achieved during the production process. When the breath gas composition of multiple production units does not affect each other, the exhalation branch pipes of multiple units are connected in parallel to the same exhalation collection main pipe, and the inhalation branch pipes are connected in parallel to the same inhalation return main pipe, sharing a single buffer tank system; when the breath gas composition of multiple production units affects each other, multiple systems described in this invention can be set up to treat waste gas with different compositions separately; in this process, the exhalation branch pipes of multiple units with the same composition can be connected in parallel to the same exhalation collection main pipe, and the inhalation branch pipes can be connected in parallel to the same inhalation return main pipe, forming a single buffer tank system, achieving zero emissions of "breathing gas" from the entire production unit during the production process.

[0018] 1. Achieve zero emissions: All breathing gas generated during the production process is collected and recycled, completely eliminating waste gas emissions and meeting green environmental protection requirements.

[0019] 2. No additional energy consumption: The gas is compressed and stored using the original power of the feed pump. When the gas is drawn in, the expansion energy of the compressed inert gas is used to return the exhaust gas. The whole process requires no additional power input, resulting in significant energy saving.

[0020] 3. Wide range of applications: Applicable to both positive and negative pressure conditions (except atmospheric pressure), with a design pressure range of ≥0MPa (excluding atmospheric pressure) and a design temperature range of -50℃ to 200℃; It can handle breathing gases generated by various materials such as liquids and solid powders, and buffer solutions and inert gases can be flexibly selected according to specific working conditions.

[0021] 4. Automatic operation: The system is interlocked with the feeding and unloading actions of the production equipment through valves, and can automatically complete the collection and reuse of breathing gas without manual operation or complicated instrument control system.

[0022] 5. Low investment and no operating costs: Compared with technologies such as activated carbon adsorption and carbon fiber adsorption and regeneration, this system only requires the addition of pipelines, buffer tanks and valves, resulting in low investment costs and no operating costs such as adsorbent replacement and catalyst regeneration.

[0023] 6. Provide a complete solution for the "breathing gas" generated by various equipment operating intermittently under pressure conditions. Applicable equipment includes various towers, tanks, vessels, and other container equipment and the pipelines connecting them. Examples include: reactors, batching tanks, metering tanks, buffer tanks, mixing tanks, washing towers, and operating tanks, as well as batch intermittent, feed-discharge equipment. Attached Figure Description

[0024] Figure 1 Schematic diagram of the structure of the intermittent production unit's breathing waste gas utilization system of the present invention In the picture: 1-Production equipment; 2-Exhalation gas collection main pipe; 3-Inhalation return main pipe; 4-First buffer tank; 5-Sealing isolation component; 6-Buffer solution; 7-Second buffer tank; 8-Inert gas; 9-Bottom connecting pipe; 10-Exhalation branch pipe; 11-Exhalation branch pipe valve; 12-Inhalation branch pipe; 13-Inhalation branch pipe valve. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0026] like Figure 1 As shown, a system for utilizing breathing exhaust gas from an intermittent production unit includes: Production equipment 1 is a batch reactor with a design pressure of 0.6 MPa (gauge pressure) and a design temperature of 80℃, used for the production of organic chemical products; The exhalation collection main pipe 2 is connected to the exhalation branch pipe 10 at the top of the reactor. The exhalation branch pipe 10 is equipped with an exhalation branch valve 11. The exhalation branch valve 11 is interlocked with the feed valve of the reactor to form a simultaneous opening and closing mechanism. The intake return main pipe 3 is connected to the intake branch pipe 12 at the top of the reactor. The intake branch pipe 12 is equipped with an intake branch valve 13. The intake branch valve 13 is interlocked with the discharge valve of the reactor to form a simultaneous opening and closing mechanism. The first buffer tank 4 has a volume of 5m³ and a design pressure of 1.0MPa. Its top is connected to the exhalation collection manifold 2 and the inhalation return manifold 3, respectively. The first buffer tank 4 is filled with a buffer solution 6. In this embodiment, the buffer solution is methyl silicone oil (with moderate viscosity, chemical inertness, and pressure resistance). A vertically movable sealing isolation component 5 is provided above the buffer solution. The sealing isolation component 5 is a stainless steel floating plate with a sealing ring on the edge. The second buffer tank 7 has a volume of 3m³ and a design pressure of 1.0MPa. It is a sealed container with a nitrogen port at the top and is filled with an inert gas 8. In this embodiment, the inert gas is nitrogen. The initial charging pressure is the same as the operating pressure of the reactor, which is 0.6MPa. The bottom connecting pipe 9 is a U-shaped pipe structure that connects the bottom of the first buffer tank 4 and the bottom of the second buffer tank 7, allowing the buffer solution 6 to flow freely in both directions between the two buffer tanks; a maintenance valve is provided on the connecting pipe.

[0027] In this embodiment, the exhalation bronchus valve 11 and the feed valve are controlled by solenoid valve linkage, and are opened or closed simultaneously; the inhalation bronchus valve 13 and the discharge valve are also controlled by solenoid valve linkage.

[0028] Process Flow Exhaled gas collection and storage stage: When the reactor needs to be fed, the feed pump is started, and the feed valve and exhaled gas branch valve 11 of the reactor open simultaneously. As the material enters the reactor, the gas phase space inside the reactor is compressed, and the exhaled gas (mainly composed of organic gases volatilized from the material) enters the top of the first buffer tank 4 through the exhaled gas branch pipe 10 and the exhaled gas collection main pipe 2. After the exhaled gas enters, it pushes the sealing isolation element 5 downward, and at the same time, it pushes part of the buffer solution 6 into the second buffer tank 7 through the bottom connecting pipe 9. The nitrogen in the second buffer tank 7 is compressed, and the pressure gradually increases from the initial 0.6 MPa to about 0.8 MPa. After the feeding is completed, the feed valve and the exhaled gas branch valve 11 close simultaneously, and the exhaled gas is stored in the upper part of the first buffer tank 4, and the system pressure reaches its highest point.

[0029] Inhalation return and energy release stage: When the reactor needs to be unloaded, the unloading valve and the inhalation branch valve 13 of the reactor open simultaneously. The compressed nitrogen in the second buffer tank 7 expands, pushing the buffer solution 6 back to the first buffer tank 4 through the bottom connecting pipe 9. At the same time, it pushes the sealing isolator 5 upward, pushing the exhaled gas stored at the top of the first buffer tank 4 back to the reactor through the inhalation return main pipe 3 and the inhalation branch pipe 12, to replenish the increased gas phase space inside the reactor during unloading. After unloading is completed, the unloading valve and the inhalation branch valve 13 close simultaneously, and the system pressure returns to the initial 0.6 MPa, completing a full breathing gas recycling process.

[0030] After continuous operation testing, the reactor achieved a breathing gas collection and reuse efficiency of over 98% in 20 batches of production, with no waste gas emissions. The material quality and reaction yield in the reactor were no different from those without the system, proving that the system has no adverse effects on production.

[0031] Example 2: Application under negative pressure conditions This embodiment is applicable to intermittent production equipment operating under negative pressure conditions, such as vacuum dryers and vacuum concentrators. The design pressure of the production equipment is -0.08 MPa (gauge pressure).

[0032] The system structure is basically the same as that of Example 1, except that: (1) The initial charging pressure of the inert gas 8 in the second buffer tank 7 is set to be consistent with the operating pressure of the production equipment (-0.08MPa), that is, the inert gas is in a negative pressure state; (2) A vacuum pump is added between the exhalation collection manifold 2 and the exhalation branch pipe 10 of the production equipment. The suction end of the vacuum pump is connected to the production equipment, and the exhaust end is connected to the exhalation collection manifold 2. It is used to extract the exhaled air in the production equipment and send it into the first buffer tank 4.

[0033] Working principle: During feeding, the vacuum pump starts, drawing out the exhaled air from the production equipment and sending it into the first buffer tank 4, pushing the sealing isolator 5 downwards. The buffer solution 6 enters the second buffer tank 7, compressing the inert gas (pressure increases from -0.08MPa to decrease from negative pressure). During unloading, the vacuum pump stops, and the compressed inert gas in the second buffer tank 7 expands, pushing the buffer solution 6 back into the first buffer tank 4, and pressing the stored exhaled air back into the production equipment. This embodiment also achieves the non-powered (no additional power except for the vacuum pump) recycling of breathing gas under negative pressure conditions.

[0034] Example 3: Parallel Application of Multiple Devices When there are multiple intermittent production devices in the same production unit, and the respiratory gas composition of each device does not affect each other, the expiratory branch pipes of multiple devices can be connected in parallel to the same expiratory gas collection main pipe, and the inspiratory branch pipes can be connected in parallel to the same inspiratory return main pipe, sharing a single buffer tank system.

[0035] In this embodiment, three reactors are used in parallel. Each reactor has a solenoid valve on its exhalation branch pipe, which is interlocked with its respective feed valve, and a solenoid valve on its inhalation branch pipe, which is interlocked with its respective discharge valve. When any reactor is feeding, its exhaled gas enters the first buffer tank through the exhaled gas collection manifold; when any reactor is discharging, the system automatically returns the stored exhaled gas to that reactor. By connecting multiple devices in parallel, the system's utilization rate and economy are further improved.

[0036] Example 4: Powder Processing Conditions When the production equipment processes powdered or fragile solid granular materials, the exhaled gas contains solid dust. To protect the buffer tank and pipelines, this embodiment adds a cyclone separator as a gas-solid separation device at the front end of the exhaled gas collection main pipe. This separator separates and collects the dust from the exhaled gas, while the clean gas enters the first buffer tank. A dust collection tank is located at the bottom of the cyclone separator for periodic discharge. The remaining structure is the same as in Embodiment 1.

[0037] Alternative solutions explained: In this invention, the sealing and isolation components inside the first buffer tank can be made of stainless steel floating panels, or organic materials such as synthetic resin, rubber, polytetrafluoroethylene, or polyester, depending on the working conditions.

[0038] The shapes of the first and second buffer tanks are not limited to vertical cylindrical shapes; they can be horizontal or other suitable shapes depending on the site space conditions.

[0039] The bottom connecting tube is preferably a U-shaped tube, but a straight tube with a compensating bend or other forms can also be used, as long as the buffer solution can flow freely in both directions.

[0040] The buffer solution can be selected according to the properties of the material: for organic material systems, methyl silicone oil, hydraulic oil, and siloxane liquids can be selected; for inorganic material systems, water or inorganic salt aqueous solution can be selected; for highly corrosive media, corrosion-resistant fluorinated oils, etc., can be selected.

[0041] Inert gases can be selected from nitrogen, carbon dioxide, argon, etc., depending on safety requirements.

[0042] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A system for utilizing breathing waste gas from an intermittent production unit, characterized in that, include: The exhalation collection manifold is connected to the exhalation branch of at least one intermittent production device to receive the exhaled air discharged when the production device is fed. The inspiratory return manifold is connected to the inspiratory branch of at least one intermittent production device to return stored expiratory air to the production device. The first buffer tank is connected at its top to the exhalation collection manifold and the inhalation return manifold, respectively, and is used to store exhaled air; the first buffer tank is filled with buffer solution, and a sealing isolator that can move up and down is provided above the buffer solution. The second buffer tank is a sealed container filled with inert gas; the bottom of the second buffer tank is connected to the bottom of the first buffer tank through a connecting pipe, allowing the buffer solution to flow bidirectionally between the two buffer tanks. The exhalation branch valve on the exhalation branch of each production device and the inhalation branch valve on the inhalation branch of each production device are used to switch between exhalation collection and inhalation return. The feed valve of each production device and the exhalation branch valve on the exhalation branch of that device form an interlocked control that opens and closes simultaneously. The discharge valve of each production device and the inhalation branch valve on the inhalation branch of that device form an interlocked control that opens and closes simultaneously.

2. The intermittent production unit's breathing waste gas utilization system according to claim 1, characterized in that, The sealing and isolation component is a floating platform made of metallic or non-metallic materials, wherein the non-metallic materials are selected from organic materials such as synthetic resin, rubber, polytetrafluoroethylene, or polyester.

3. The intermittent production unit's exhaust gas utilization system according to claim 1, characterized in that, The buffer solution is selected from one of the following: hydraulic oil, siloxane liquid, water, inorganic salt aqueous solution, or corrosion-resistant fluorinated oil.

4. The intermittent production unit's breathing waste gas utilization system according to claim 1, characterized in that, The inert gas is selected from nitrogen, carbon dioxide, or argon.

5. The intermittent production unit's breathing waste gas utilization system according to claim 1, characterized in that, The connecting pipe has a U-shaped structure.

6. The intermittent production unit's breathing waste gas utilization system according to claim 1, characterized in that, It also includes a "gas-solid" or "gas-liquid" separation device, which is set at the front end of the exhalation collection manifold to process exhaled air containing mist or solid particles.

7. The intermittent production unit's breathing waste gas utilization system according to claim 1, characterized in that, It also includes a gas scrubbing device, which is installed at the front end of the exhalation collection manifold to treat exhaled air that is prone to self-aggregation or sticking to the wall.

8. A process for utilizing breathing exhaust gas from a system for utilizing breathing exhaust gas from an intermittent production unit according to any one of claims 1-7, characterized in that, Includes the following steps: Exhalation collection and energy storage steps: When the production equipment is fed, the feed valve of the production equipment and the exhalation branch valve on the exhalation branch pipe of the equipment are opened simultaneously. The exhaled air in the production equipment enters the top of the first buffer tank through the exhalation collection main pipe, pushing the sealing isolation component downward. At the same time, part of the buffer solution is forced into the second buffer tank through the bottom connecting pipe, compressing the inert gas in the second buffer tank and increasing the pressure. After the feeding is completed, the exhaled air is stored in the upper part of the first buffer tank, and the system pressure reaches the highest point. Inhalation return and energy release steps: When the production equipment unloads, the unloading valve and the inhalation branch valve on the equipment's inhalation branch pipe open simultaneously. The compressed inert gas in the second buffer tank expands, pushing the buffer solution back to the first buffer tank through the bottom connecting pipe. At the same time, it pushes the sealing isolation component upward, pushing the exhaled air stored at the top of the first buffer tank back to the production equipment through the inhalation return main pipe. After unloading is completed, the system returns to the initial pressure.

9. The process for utilizing respiratory waste gas according to claim 8, characterized in that, In the exhalation collection and energy storage step, the energy for exhalation entering the first buffer tank and compressing the inert gas comes from the power of the feed pump of the production equipment, requiring no additional power input; in the inhalation return and energy release step, the energy for exhalation returning to the production equipment comes from the expansion energy of the compressed inert gas in the second buffer tank, requiring no additional power input.

10. The process for utilizing respiratory waste gas according to claim 8, characterized in that, When the components of the exhaled gases from multiple production devices do not affect each other, the exhalation branch pipes of multiple devices are connected in parallel to the same exhalation collection manifold, and the inhalation branch pipes are connected in parallel to the same inhalation return manifold, sharing a single buffer tank system. When the components of the exhaled gases from multiple production devices affect each other, multiple systems as described in this invention can be set up to treat waste gases with different compositions. In this process, the exhalation branch pipes of multiple devices with the same composition can be connected in parallel to the same exhalation collection manifold, and the inhalation branch pipes can be connected in parallel to the same inhalation return manifold, forming a single buffer tank system.

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