A safe and environment-friendly device for realizing tail gas reabsorption and material cooling

Abstract

The utility model discloses a kind of safety environmental protection devices achieving tail gas recovery and material cooling, belong to chemical environmental protection equipment technical field.The device mainly includes gas ring vacuum pump, pulse dust collector, nitrogen supply equipment and closed unloader.By gas ring vacuum pump, tail gas recovery is realized, and the tail gas with entrained solvent is stably transported to absorption tower;Pulse dust collector uses antistatic film filter cartridge to carry out gas-solid separation, to ensure that material falls back to bunker;Nitrogen supply equipment inputs low-temperature nitrogen to buffer bunker, realizes tail gas replacement and material cooling, while balancing system pressure;Closed unloader prevents air from entering system.The utility model effectively solves the problems of tail gas unrecoverable, high material temperature and high safety risk in the original system, and has the advantages of stable operation, high processing efficiency, simple operation and maintenance, environmental protection and energy saving, and is suitable for cellulose production and related chemical field tail gas treatment and material cooling.

Description

Technical Field

[0001] This utility model relates to the field of chemical environmental protection equipment technology, and in particular to a safe and environmentally friendly device for realizing the reabsorption of exhaust gas and cooling of materials. Background Technology

[0002] In the production of cellulose products, after drying and before entering the pulverizing process, the product typically requires gas-solid separation and exhaust gas treatment in a buffer silo. The original drying exhaust gas absorption system mainly consists of a dryer, a buffer silo, and an absorption tower, such as... Figure 1 As shown. However, the original system has the following drawbacks: First, when the material enters the buffer silo, it carries a large amount of high-temperature exhaust gas. This exhaust gas contains unrecovered solvents. However, due to the lack of effective gas-solid separation equipment, the exhaust gas cannot enter the absorption tower for treatment, resulting in the direct discharge of solvents, which causes resource waste and environmental pollution.

[0003] Secondly, the mixing of high-temperature gas and materials in the buffer silo not only keeps the material temperature high, but also poses a risk of combustion and explosion, seriously affecting production safety.

[0004] In addition, the existing system is prone to creating negative pressure in the buffer hopper during exhaust gas extraction, which can cause air to be drawn into the system, further increasing safety risks and affecting the exhaust gas treatment effect.

[0005] While some exhaust gas treatment devices exist in the existing technology, most focus on a single function, such as only absorbing exhaust gas or only cooling materials. They lack integrated design and cannot simultaneously achieve efficient exhaust gas recovery, material cooling, and stable system pressure. Therefore, developing a device that integrates exhaust gas recovery, material cooling, and safety protection is of significant practical importance. Utility Model Content

[0006] Based on the problems existing in the above-mentioned background technology, this utility model proposes a safe and environmentally friendly device for realizing the reabsorption of tail gas and cooling of materials. In the process of cellulose production, it solves the problem that the drying tail gas absorption system cannot effectively recover the solvent in the tail gas, reduce the material temperature, and prevent air from entering.

[0007] To achieve the above-mentioned objectives, the technical solution adopted by this utility model is as follows: This utility model provides a safe and environmentally friendly device for realizing exhaust gas reabsorption and material cooling, which includes a buffer silo and an absorption tower; the buffer silo is connected to a dryer through a pipeline, and a sealed unloader is installed on the pipeline between the buffer silo and the dryer; the absorption tower is connected to the buffer silo and the dryer through pipelines respectively; a gas ring vacuum pump is installed on the pipeline between the absorption tower and the buffer silo. A pulse dust collector is installed at the top of the buffer silo, a discharge pipe is installed at the bottom of the buffer silo, a sealed unloader is installed on the discharge pipe, and a nitrogen supply device is installed on one side of the buffer silo.

[0008] Furthermore, the pulse dust collector includes an antistatic membrane filter cartridge with a filtration accuracy of 0.1 micrometers to 10 micrometers, which can effectively isolate solid materials while allowing gas to pass through.

[0009] Furthermore, the nitrogen supply equipment includes a nitrogen source, a cooler, and a pressure regulating valve, which can provide cryogenic nitrogen and control its flow rate and pressure.

[0010] Furthermore, the safety and environmental protection device for realizing exhaust gas reabsorption and material cooling also includes a control system; the buffer silo is equipped with temperature sensors and pressure sensors; the air ring vacuum pump, pulse dust collector, nitrogen supply equipment, sealed unloader, temperature sensor and pressure sensor are all electrically connected to the control system, and the entire safety and environmental protection device is automated through the control system, realizing automatic monitoring and control, reducing manual operation, and improving operating efficiency and reliability.

[0011] Furthermore, the sealed unloader is a rotary valve or a double gate valve with a sealing rating of not less than IP65, which can effectively prevent air backflow.

[0012] Compared with existing drying exhaust gas absorption systems, the advantages of this invention are: This invention provides a safe and environmentally friendly device for reabsorbing exhaust gas and cooling materials. It uses a ring vacuum pump to stably extract exhaust gas and a pulse dust collector for gas-solid separation, ensuring effective recovery of solvents from the exhaust gas, reducing environmental pollution, and improving resource utilization. A nitrogen supply device introduces low-temperature nitrogen into the buffer silo, not only displacing the high-temperature exhaust gas but also rapidly reducing the material temperature due to nitrogen's low-temperature properties, eliminating the risk of combustion and explosion, and improving production safety. Simultaneously, the nitrogen supplied balances the negative pressure generated by the ring vacuum pump during exhaust gas extraction, preventing air from entering and avoiding the formation of an explosive mixture of oxygen and solvent vapors, ensuring stable system operation. This solves the problems of drying exhaust gas absorption systems failing to effectively recover solvents from exhaust gas, reduce material temperature, and prevent air ingress. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. The above and other objects, features, and advantages of this utility model will become clearer through the drawings. The same reference numerals indicate the same parts in all the drawings. The drawings are not intentionally drawn to scale to actual dimensions; the focus is on illustrating the main idea of ​​this utility model.

[0014] Figure 1 This is a schematic diagram of the original drying exhaust gas absorption system.

[0015] Figure 2 This invention relates to a safe and environmentally friendly device for achieving exhaust gas reabsorption and material cooling.

[0016] The components include: 1. Dryer; 2. Buffer silo; 3. Absorption tower; 4. Pulse dust collector; 5. Gas ring vacuum pump; 6. Nitrogen supply equipment; and 7. Sealed unloader. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0019] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0020] like Figure 2As shown, this utility model provides a safe and environmentally friendly device for realizing exhaust gas reabsorption and material cooling, including a buffer silo 2 and an absorption tower 3; the buffer silo 2 is connected to a dryer 1 through a pipeline, and a sealed unloader 7 is installed on the pipeline between the buffer silo 2 and the dryer 1; the absorption tower 3 is connected to the buffer silo 2 and the dryer through pipelines respectively; a gas ring vacuum pump 5 is installed on the pipeline between the absorption tower 3 and the buffer silo 2; a pulse dust collector 4 is installed at the top of the buffer silo 2, a discharge pipe is installed at the bottom of the buffer silo 2, a sealed unloader 7 is installed on the discharge pipe, and a nitrogen supply device 6 is installed on one side of the buffer silo 2.

[0021] The pulse dust collector 4 includes an anti-static membrane filter cartridge with a filtration accuracy of 0.1 micrometers to 10 micrometers.

[0022] The nitrogen supply equipment 6 includes a nitrogen source, a cooler, and a pressure regulating valve.

[0023] The sealed unloader 7 is a rotary valve or a double gate valve with a sealing rating of not less than IP65, which can effectively prevent air backflow.

[0024] The working principle of the safe and environmentally friendly device for exhaust gas reabsorption and material cooling is as follows: Buffer silo 2 receives materials from dryer 1 and performs temporary storage and gas-solid separation. Pulse dust collector 4 is installed at the exhaust gas outlet at the top of buffer silo 2, and its interior is equipped with an anti-static membrane filter cartridge with a filtration accuracy of 1 micron. When materials carrying exhaust gas enter buffer silo 2, the solid materials are isolated by the filter cartridge and fall back to the bottom of the silo due to gravity, while the gas passes through the filter cartridge into the clean air chamber of pulse dust collector 4.

[0025] A ring vacuum pump 5 is connected to the clean air chamber of the pulse dust collector 4 via a pipeline, drawing in the exhaust gas and conveying it to the absorption tower 3. The ring vacuum pump 5 is made of corrosion-resistant stainless steel, and its pumping rate can be adjusted according to operating conditions to ensure the stability of exhaust gas recovery. The nitrogen supply equipment 6 includes a liquid nitrogen storage tank, a vaporizer, and a pressure regulating valve. Liquid nitrogen is vaporized into cryogenic nitrogen (approximately 0°C) by the vaporizer and fed into the bottom of the buffer silo 2 via a pipeline. The cryogenic nitrogen fully contacts the material inside the buffer silo 2, achieving exhaust gas replacement and material cooling. Simultaneously, the nitrogen input is controlled by the pressure regulating valve to balance the negative pressure generated when the ring vacuum pump 5 draws in the exhaust gas. A sealed unloader 7, using a rotary valve structure, is installed at the discharge pipe of the buffer silo 2. When the material accumulates to a certain amount, the sealed unloader 7 opens, conveying the material to the downstream process; its high sealing performance effectively prevents air from entering the system.

[0026] Preferably, but not limited to, the existing safety and environmental protection device for exhaust gas reabsorption and material cooling also includes a control system, which can be connected to a PLC control system; the buffer silo 2 is equipped with temperature and pressure sensors; the air ring vacuum pump 5, pulse dust collector 4, nitrogen supply equipment 6, sealed unloader 7, temperature sensor and pressure sensor are all electrically connected to the control system. The system automatically adjusts the pumping rate of the air ring vacuum pump 5 and the nitrogen flow rate of the nitrogen supply equipment 6 according to the sensor data, so as to realize intelligent operation, realize the automated operation of the entire safety and environmental protection device, realize automatic monitoring and control, reduce manual operation, and improve operating efficiency and reliability.

[0027] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A safe and environmentally friendly device for achieving exhaust gas reabsorption and material cooling, characterized in that, It includes a buffer silo and an absorption tower; the buffer silo is connected to a dryer via a pipeline, and a sealed discharge device is installed on the pipeline between the buffer silo and the dryer; the absorption tower is connected to both the buffer silo and the dryer via pipelines; a gas ring vacuum pump is installed on the pipeline between the absorption tower and the buffer silo. A pulse dust collector is installed at the top of the buffer silo, a discharge pipe is installed at the bottom of the buffer silo, a sealed unloader is installed on the discharge pipe, and a nitrogen supply device is installed on one side of the buffer silo.

2. The safe and environmentally friendly device for realizing exhaust gas reabsorption and material cooling according to claim 1, characterized in that, The pulse dust collector includes an anti-static membrane filter cartridge with a filtration accuracy of 0.1 micrometers to 10 micrometers.

3. The safe and environmentally friendly device for realizing exhaust gas reabsorption and material cooling according to claim 1, characterized in that, The nitrogen supply equipment includes a nitrogen source, a cooler, and a pressure regulating valve.

4. The safe and environmentally friendly device for realizing exhaust gas reabsorption and material cooling according to claim 1, characterized in that, It also includes a control system; the buffer silo is equipped with a temperature sensor and a pressure sensor; the air ring vacuum pump, pulse dust collector, nitrogen supply equipment, sealed unloader, temperature sensor and pressure sensor are all electrically connected to the control system.

5. The safe and environmentally friendly device for realizing exhaust gas reabsorption and material cooling according to claim 1, characterized in that, The sealed unloader is a rotary valve or a double gate valve, and its sealing rating is not lower than IP65.

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