Ventilation system and method for heat toxin separation and waste heat utilization of waste gas in spinning workshop

Abstract

The invention relates to the technical field of waste gas treatment of spinning workshops, and discloses a ventilation system and method for heat and toxicity separation and waste heat utilization of waste gas of a spinning workshop. High-temperature waste gas exhausted from an exhaust outlet of the spinning workshop is firstly purified through a waste gas biological purification treatment device, so that heat and toxicity separation is achieved; the temperature of the purified gas is increased by utilizing the oxidation exothermic effect of pollutant biodegradation in the waste gas biological purification treatment device, and then the treated gas is subjected to heat exchange by utilizing the heat exchange type heat exchanger, so that the waste heat is safely and efficiently recycled, and the energy consumption is reduced on the premise of thoroughly purifying the waste gas and ensuring the safety of the workshop environment. Waste heat resources are recycled to the maximum extent, workshop fresh air treatment energy consumption is reduced, and the overall energy efficiency and reliability of the system are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of waste gas treatment in spinning workshops, in particular to a ventilation system and method for heat-toxic separation and waste heat utilization of waste gas in spinning workshops. Background Art

[0002] Spinning workshops face significant energy consumption and emissions challenges during production, generating significant amounts of waste heat. This presents significant potential for energy conservation and emission reduction. Developing effective spinning workshop waste gas treatment and heat recovery technologies can not only replace or reduce traditional energy consumption for workshop ventilation or process preheating, but also efficiently remove pollutants and ensure environmental safety. These technologies offer significant economic and environmental benefits, reducing operational costs, minimizing carbon emissions, and achieving sustainable development.

[0003] However, for safety reasons, spinning workshops currently generally use a direct discharge method for high-temperature exhaust gases. This method results in a huge waste of waste heat resources and extremely low waste heat utilization. At the same time, the exhaust gas from spinning workshops exhibits the typical "heat-toxin coexistence" characteristic, meaning that high-temperature waste heat is deeply coupled with highly concentrated, complex pollutants. On the one hand, waste heat equipment is easily corroded and damaged by pollutants, which severely limits the recovery and utilization of waste heat. On the other hand, the coexistence of pollutants and waste heat makes it difficult to achieve safe and effective "heat-toxin separation," thus hindering the realization of efficient waste heat utilization. How to break through the constraints of "heat-toxin coexistence" and achieve efficient pollutant purification and safe and efficient waste heat recovery without compromising workshop environmental safety has become a key constraint to improving energy efficiency and promoting green development in spinning workshops. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a ventilation system and method for heat and poison separation and waste heat utilization of spinning workshop exhaust gas, which realizes an efficient "heat and poison separation" mechanism in the spinning workshop, utilizes the oxidative exothermic effect of pollutant biodegradation in the waste gas biological purification treatment device to increase the temperature of the purified gas, and at the same time ensures the continuous and safe operation of the system through the parallel device design, which not only realizes the efficient purification of pollutants, but also separates the waste heat from the pollutants, creating conditions for the subsequent waste heat utilization.

[0005] In order to achieve the above object, the present invention is implemented through the following technical solutions: In a first aspect, a ventilation system for separating heat and toxins from exhaust gas in a spinning workshop and utilizing waste heat comprises: The waste gas biological purification treatment device has an inlet end connected to the exhaust outlet of the spinning workshop through an exhaust pipe, an outlet end connected to one end of the supply air pipe, and the other end of the supply air pipe is connected to one end of the inlet air pipe; the other end of the inlet air pipe is connected to the air inlet of the spinning workshop; the supply air pipe is sequentially provided with a pollutant concentration detector, a circulating fan and a heat exchanger; the heat exchanger includes a direct heat exchanger and an indirect heat exchanger connected in parallel between the circulating fan and the inlet air pipe, and the high-temperature gas is sent to different heat exchangers according to the concentration data detected by the pollutant concentration detector; The fresh air fan is connected to the direct heat exchanger and the indirect heat exchanger respectively.

[0006] As a further implementation method, the exhaust duct is provided with a first temperature sensor for detecting the exhaust temperature near one end of the exhaust port, and a first heat exchange branch is also connected in parallel to the exhaust duct. The first heat exchange branch is provided with a first heat exchanger, and the first heat exchanger is connected to the first cooling tower through a circulation loop.

[0007] As a further implementation, a second heat exchange branch is connected in parallel to the air inlet pipe, a second heat exchanger is provided on the second heat exchange branch, a fifth temperature sensor is provided at the outlet end, and the second heat exchanger is connected to the second cooling tower through a circulation loop.

[0008] As a further implementation, the waste gas biological purification treatment device includes a main waste gas biological purification treatment device and a backup waste gas biological purification treatment device connected in parallel between the pollutant concentration detector and the exhaust pipe.

[0009] As a further implementation method, the outlet end of the direct heat exchanger is connected to the air inlet pipeline through two pipelines with solenoid valves to achieve direct mixing and heat exchange of high-temperature purified gas and fresh air before entering the air inlet pipeline. An exhaust port is provided on the pipeline for discharging the purified gas from the direct heat exchanger.

[0010] As a further implementation method, a second temperature sensor is provided at the outlet end of the first heat exchange branch; a third temperature sensor is provided at the two pipes on the air inlet pipe close to the outlet end of the direct heat exchange heat exchanger, for detecting the temperature of the mixture of high-temperature purified gas and fresh air.

[0011] As a further implementation method, the fresh air fan is connected to the cold side channel of the indirect heat exchanger, and the circulating fan is connected to the heat source side channel of the indirect heat exchanger. The purified gas after heat exchange is directly discharged into the atmosphere, and the preheated fresh air enters the air inlet pipe. A fourth temperature sensor is provided on the pipe between the outlet end of the cold side channel and the air inlet pipe.

[0012] As a further implementation, a solenoid valve is provided on the exhaust pipe between the two ends of the first heat exchange branch, and a solenoid valve is provided on the air inlet pipe between the two ends of the second heat exchange branch.

[0013] As a further implementation, both the first heat exchange branch and the second heat exchange branch are provided with variable frequency water pumps.

[0014] In a second aspect, a ventilation method for separating heat and toxins from exhaust gas in a spinning workshop and utilizing waste heat, employing any of the ventilation systems described above, comprises the following steps: Detect the high-temperature gas temperature discharged from the exhaust port into the exhaust pipe. If it is higher than the set value, the high-temperature gas in the exhaust pipe enters the first parallel heat exchange branch on the exhaust pipe to cool down and then enters the exhaust gas biological purification treatment device for purification. If it is lower than the set value, it directly enters the exhaust gas biological purification treatment device for purification; The waste gas biological purification treatment device purifies the high-temperature gas and then discharges it into the air supply pipe. The pollutant concentration in the gas is detected by the pollutant concentration detector. If the concentration meets the standard, the purified high-temperature gas will be discharged into the direct heat exchanger. If the concentration does not meet the standard, the purified high-temperature gas will be discharged into the indirect heat exchanger. The fresh air fan will pass the outdoor fresh air into the corresponding heat exchanger for heat exchange; The temperature of the gas entering the air inlet pipeline after heat exchange is detected. If it is higher than the set value, the gas in the air inlet pipeline enters the second heat exchange branch connected in parallel on the air inlet pipeline for cooling and then enters the spinning workshop. If it is lower than the set value, it enters the spinning workshop directly.

[0015] The beneficial effects of the present invention are as follows: 1. The present invention first purifies the high-temperature exhaust gas discharged from the exhaust port of the spinning workshop through a waste gas biological purification treatment device to achieve "heat-toxin separation", and uses the oxidative exothermic effect of the biodegradation of pollutants in the waste gas biological purification treatment device to increase the temperature of the purified gas. The treated gas is then subjected to heat exchange using a heat exchange heat exchanger to achieve safe and efficient recovery and utilization of waste heat, ensuring that while thoroughly purifying the exhaust gas and ensuring the safety of the workshop environment, the waste heat resources are maximized and utilized, reducing the energy consumption of fresh air treatment in the workshop and improving the overall energy efficiency and reliability of the system.

[0016] 2. The present invention sets up parallel direct heat exchangers and indirect heat exchangers. The gas is passed into the corresponding heat exchanger according to the concentration of pollutants after purification. For gases that meet the standards, heat can be directly exchanged in the direct heat exchanger to improve the heat exchange efficiency. In addition, the waste gas biological purification treatment devices are set in parallel. When one of them fails, the other can be switched to the system. The parallel device design ensures continuous and safe operation of the system, which not only achieves efficient purification of pollutants, but also separates waste heat from pollutants, creating conditions for subsequent waste heat utilization.

[0017] 3. The ventilation method for heat and toxic separation and waste heat utilization of spinning workshop waste gas proposed in the present invention is designed with a dual-mode waste heat cascade utilization, which can efficiently recover waste heat while ensuring safety. The system is powerful, has a strong energy-saving effect, and is highly practical. Multi-condition judgment and feedback adjustment based on real-time monitoring parameters ensures that the waste heat resources are maximized while thoroughly purifying the waste gas and ensuring the safety of the workshop environment. It has good operational reliability and strong applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0019] Figure 1 Is a schematic structural diagram of the ventilation system for separating heat and toxic waste gas from a spinning workshop and utilizing waste heat in an embodiment of the present invention; Figure 2 It is a flow chart of a ventilation method for separating heat and toxins from exhaust gas in a spinning workshop and utilizing waste heat in an embodiment of the present invention.

[0020] In the figure: the distances or sizes between parts are exaggerated to show the positions of various parts, and the schematic diagram is for reference only.

[0021] Among them: 1. Spinning workshop, 2. Exhaust vent, 3. First cooling tower, 4. Solenoid valve, 5. Solenoid valve, 6. Solenoid valve, 7. First variable frequency water pump, 8. First air-water heat exchanger, 9. Solenoid valve, 10. Solenoid valve, 11. Main exhaust gas biological purification treatment device, 12. Backup exhaust gas biological purification treatment device, 13. Solenoid valve, 14. Solenoid valve, 15. Pollutant concentration detector, 16. Circulating fan, 17. Solenoid valve, 18. Fresh air fan, 19. Solenoid valve, 20. Direct heat exchange heat exchanger, 21. Solenoid valve, 22. Solenoid valve, 23. Indirect heat exchange heat exchanger, 24. Solenoid valve, 25. Solenoid valve, 26. Exhaust vent, 27. Solenoid valve, 28. Exhaust vent, 29. Solenoid valve, 30. Solenoid valve, 31. Solenoid valve, 32. Second variable frequency water pump, 33. Second air-water heat exchanger, 34. Second cooling tower. DETAILED DESCRIPTION

[0022] It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0023] Example 1 In a typical embodiment of the present invention, referring to Figure 1-Figure 2As shown, a ventilation system for separating heat and toxins from exhaust gas and utilizing waste heat in a spinning workshop is composed of corresponding purification structures, heat exchange structures and pipelines connected between the air inlet and exhaust outlet of the spinning workshop 1. A machine room is provided in the spinning workshop 1. The corresponding structure of the ventilation system mainly includes an exhaust gas biological purification treatment device, an air-water heat exchanger, a pollutant concentration detector 15, a circulating fan 16, a heat exchange heat exchanger, a fresh air fan 18 and corresponding temperature sensors and solenoid valves.

[0024] The spinning workshop 1 is provided with an air inlet and an air exhaust 2. The high-temperature gas carrying pollutants is discharged from the air exhaust 2. The ventilation system purifies and cools the high-temperature gas carrying pollutants so that the gas meeting the air intake requirements re-enters the spinning workshop 1 through the air inlet.

[0025] like Figure 1 As shown in the figure, the specific structure of the ventilation system for heat and toxic separation and waste heat utilization of the spinning workshop exhaust gas is set according to the gas flow direction: The exhaust port 2 is connected to the waste gas biological purification treatment device through the exhaust pipe; the waste gas biological purification treatment device is connected to the heat exchanger through the air supply pipe, and the heat exchanger is connected to the air inlet of the spinning workshop 1 through the air inlet pipe, thereby forming a circulating ventilation system.

[0026] Specifically, a group of first heat exchange branches are connected in parallel at the front end of the exhaust duct near the exhaust port 2. A solenoid valve 4 is provided at the inlet end of the first heat exchange branch, and a solenoid valve 5 is provided at the outlet end. A solenoid valve 6 is provided on the exhaust duct between the inlet end and the outlet end of the first heat exchange branch.

[0027] A first heat exchanger is provided on the first heat exchange branch between the inlet and outlet ends of the first heat exchange branch. The first heat exchanger is specifically a first air-water heat exchanger 8. The first air-water heat exchanger 8 is connected to the first cooling tower 3 through a first circulation cooling circuit with a first variable frequency water pump 7.

[0028] Furthermore, the end of the exhaust pipe is connected to a waste gas biological purification treatment device, which includes a main waste gas biological purification treatment device 11 and a backup waste gas biological purification treatment device 12 that are arranged in parallel with each other.

[0029] like Figure 1 As shown, a solenoid valve 9 is provided between the end of the exhaust pipe and the air inlet of the main exhaust gas biological purification treatment device 11, and a solenoid valve 10 is provided between the end of the exhaust pipe and the air inlet of the backup exhaust gas biological purification treatment device 12.

[0030] like Figure 1 As shown, the waste gas biological purification treatment device is connected to the heat exchanger through the air supply pipeline: The front end of the air supply pipeline is connected to the pipelines at the outlet ends of the main exhaust gas biological purification treatment device 11 and the backup exhaust gas biological purification treatment device 12. A solenoid valve 13 is provided on the pipeline at the outlet end of the main exhaust gas biological purification treatment device 11, and a solenoid valve 14 is provided on the pipeline at the outlet end of the backup exhaust gas biological purification treatment device 12.

[0031] Under normal conditions, solenoid valves 9 and 13 are open, and solenoid valves 10 and 14 are closed, allowing gas to enter the main biological exhaust gas purification treatment device 11 for purification and discharge. If a failure occurs in the main biological exhaust gas purification treatment device 11, solenoid valves 9 and 13 are closed, and solenoid valves 10 and 14 are opened, allowing the backup biological exhaust gas purification treatment device 12 to take over. Therefore, the main biological exhaust gas purification treatment device 11 and the backup biological exhaust gas purification treatment device 12 have the same structure, and their parallel arrangement is intended to prevent failure of either biological exhaust gas purification treatment device.

[0032] The waste gas biological purification treatment device creates an environment suitable for microbial metabolism and utilizes a tamed and screened composite microbial community to biodegrade characteristic pollutants in the waste gas. The waste gas first dissolves into the liquid phase or adsorbs onto the surface of a biofilm carrier through a gas-liquid / gas-solid mass transfer process. The microorganisms then oxidize and decompose the pollutants, using them as a carbon, nitrogen, or sulfur source, converting them into carbon dioxide, water, inorganic salts, and biomass. This simultaneous generation of heat allows for efficient mineralization of the pollutants, odor elimination, and further enhances the quality of the waste heat.

[0033] The air supply duct is equipped, from front to back, with a pollutant concentration detector 15, a circulating fan 16, and a heat exchanger. Circulating fan 16 can be a centrifugal circulating fan, providing power for gas circulation within the system and high air pressure to ensure effective air circulation within spinning workshop 1. The pollutant concentration detector 15 is used to detect the concentration of pollutants (primarily H2S and CS2) in the gas after treatment by the exhaust gas biological purification device and discharge into the air supply duct through solenoid valve 13 or solenoid valve 14, thereby controlling the system's operating mode.

[0034] The heat exchangers in the air supply duct include a direct heat exchanger 20 and an indirect heat exchanger 23, which are connected in parallel. The pollutant concentration detector 15 detects the pollutant concentration in the gas after purification by the exhaust gas biological purification device and compares the detected concentration data with the set concentration to determine whether the gas should be passed through the direct heat exchanger 20 or the indirect heat exchanger 23.

[0035] Specifically, the circulating fan 16 is connected to the inlet of the direct heat exchanger 20 via an air supply pipeline with a solenoid valve 17 and is also connected to the inlet of the heat source side channel of the indirect heat exchanger 23 via a branch pipeline with a solenoid valve 21.

[0036] It also includes a fresh air fan 18. The inlet ends of the two groups of heat exchangers are connected to the fresh air fan 18. The fresh air fan 18 is connected to the inlet end of the direct heat exchanger 20 through a pipeline with a solenoid valve 19, and is also connected to the inlet end of the cold side channel of the indirect heat exchanger 23 through a pipeline with a solenoid valve 22.

[0037] The purpose of the fresh air fan 18 is to introduce outdoor fresh air into the system to ensure that the fresh air volume meets the national standards to meet the indoor air quality and personnel health needs.

[0038] An exhaust port 26 is provided at the outlet end of the direct heat exchanger 20 for discharging a set proportion of gas.

[0039] The indirect heat exchanger 23 is provided with an exhaust port 28. The waste gas biological purification treatment device processes substandard gas, that is, gas with a dirt concentration higher than the set value, which enters the indirect heat exchanger 23 for indirect heat exchange and is discharged from the exhaust port 28 after heat exchange without entering the system.

[0040] The treated gas that meets the standards is controlled by the corresponding valve and enters the direct heat exchange heat exchanger 20 to be directly mixed with the outdoor fresh air introduced by the fresh air fan 18 for heat exchange, which greatly improves the heat exchange efficiency. After the heat exchange of this part of the treated gas, part of the gas enters the system and part of the gas is discharged from the exhaust port 26.

[0041] The outlet end of the direct heat exchanger 20 is connected to the air inlet pipeline through a pipeline with a solenoid valve 25, and is also connected to the air inlet pipeline through a pipeline with a solenoid valve 24. The pipeline with the exhaust port 26 is connected to the pipeline with the solenoid valve 24.

[0042] The outlet of the indirect heat exchanger 23 is connected to the front end of the air inlet pipeline via a pipeline. The fresh air blower 18 drives fresh air through the solenoid valve 22 into the indirect heat exchanger 23, where it undergoes non-contact heat exchange with the high-temperature gas that has not yet reached the standard after passing through the circulating fan 16 and the solenoid valve 21. The heat-exchanged gas is discharged from the exhaust port 28, and the fresh air enters the air inlet pipeline. The indirect heat exchanger 23 can be a plate heat exchanger or a tube heat exchanger.

[0043] A solenoid valve 27 is provided on the air inlet pipeline between the outlet end of the indirect heat exchanger 23 and the pipeline with the solenoid valve 25. When the solenoid valve 27 is closed, the indirect heat exchanger 23 does not participate in the circulation.

[0044] Furthermore, a heat exchange structure is also provided on the air inlet duct near the air inlet of spinning workshop 1. Specifically, a second heat exchange branch is connected in parallel at the end of the air inlet duct near the air inlet of spinning workshop 1. The air inlet end of the second heat exchange branch is provided with a solenoid valve 30, and the air outlet end is provided with a solenoid valve 31. A solenoid valve 29 is provided on the air inlet duct between the air inlet and air outlet ends of the second heat exchange branch.

[0045] A second air-water heat exchanger 33 is provided on the second heat exchange branch between the air inlet and the air outlet of the second heat exchange branch. The first air-water heat exchanger 33 is connected to the second cooling tower 34 through a second circulation cooling circuit with a second variable frequency water pump 32.

[0046] This embodiment further provides a temperature sensor, wherein a first temperature sensor is provided on the exhaust duct near the exhaust port 2 to monitor the temperature of the exhaust gas discharged from the exhaust port of the spinning workshop in real time. The temperature therein is represented as Tn.

[0047] A second temperature sensor is provided downstream of the solenoid valve 5 at the outlet end of the first heat exchange branch, and the temperature detected therein is represented as the exhaust gas temperature Tz after being cooled by the first cooling tower 3 .

[0048] A third temperature sensor is provided at the mixing point of fresh air and purified high-temperature exhaust gas downstream of the direct heat exchanger 20. Specifically, it is located at the junction of the air inlet pipe and the downstream of the solenoid valve 24 at the hot-side outlet of the direct heat exchanger 20. The temperature at this point is denoted as Th.

[0049] A fourth temperature sensor is provided at the outlet of the cold side channel of the indirect heat exchanger 23, i.e., the fresh air outlet pipe. The temperature there is denoted as Tm. A fifth temperature sensor is provided downstream of the solenoid valve 31 at the outlet end of the second heat exchange branch. The temperature there is denoted as Tv.

[0050] In addition, Tx is set as the temperature threshold for bacterial inactivation in the waste gas biological purification treatment device, and Ty is the comfortable air supply temperature of the workshop.

[0051] Specifically, by obtaining the temperature Tn, according to Tx, it is determined whether the first air-water heat exchanger 8 on the first heat exchange branch needs to participate in the heat exchange to cool the discharged high-temperature exhaust gas. If the temperature of the high-temperature exhaust gas discharged from the spinning workshop is higher than the threshold value of the inactivation temperature of the bacterial flora in the waste gas biological purification treatment device, the high-temperature process exhaust gas discharged from the spinning workshop is first passed through the first air-water heat exchanger 8, and the closed first cooling tower 3 is used to reasonably cool the exhaust gas before it is sent to the waste gas biological purification treatment device for treatment and purification.

[0052] According to the temperature Tz of the exhaust gas after being cooled by the first cooling tower 3, the variable frequency water pump is adjusted to adjust the temperature of the exhaust gas after cooling by the cooling tower.

[0053] Similarly, the temperature Tv detected on the second heat exchange branch is used to determine whether the temperature of the treated gas is suitable for entering the spinning workshop.

[0054] In this embodiment, the high-temperature exhaust gas discharged from the exhaust port 2 of the spinning workshop is first purified by a waste gas biological purification treatment device to achieve heat and toxic separation, and then the treated gas is heat exchanged using a heat exchange heat exchanger to achieve safe and efficient recovery and utilization of waste heat, ensuring that under the premise of thoroughly purifying the exhaust gas and ensuring the safety of the workshop environment, the waste heat resources are maximized and utilized, reducing the energy consumption of fresh air treatment in the workshop, and improving the overall energy efficiency and reliability of the system.

[0055] The heat exchange type heat exchanger includes a direct heat exchange type heat exchanger 20 and an indirect heat exchange type heat exchanger 23 arranged in parallel. When the concentration of the exhaust gas pollutants after purification meets the standard, it can directly exchange heat with mixed air for supply; when the concentration of the exhaust gas pollutants after purification does not meet the standard, it can indirectly exchange heat with fresh air.

[0056] Specifically, the system is divided into two operating modes according to the concentration of gas pollutants after purification: direct heat exchange mixed air supply 20 and indirect heat exchange fresh air 23.

[0057] The system process of the direct heat exchange mixed air supply mode is as follows: the high-temperature process waste gas discharged from the exhaust port 2 of the spinning workshop 1 first enters the waste gas biological purification treatment device for treatment and purification. If the temperature of the high-temperature waste gas discharged from the spinning workshop is higher than the threshold value of the bacterial inactivation temperature in the waste gas biological purification treatment device, the high-temperature process waste gas discharged from the spinning workshop is first passed through the first air-water heat exchanger 8, and the closed first cooling tower 3 is used to reasonably cool the waste gas before it is sent to the waste gas biological purification treatment device for treatment and purification.

[0058] Utilizing the exothermic oxidation effect associated with the biodegradation of pollutants, the temperature of the purified gas is significantly raised before it is fed into a direct heat exchanger 20. Simultaneously, fresh outdoor air is introduced into the system by a fresh air blower 18 and enters the same direct heat exchanger 20 as a cooling source, where it undergoes efficient mixing and heat exchange with the high-temperature purified gas. The preheated fresh outdoor air and the purified gas, after heat exchange, are mixed at the downstream outlet of the direct heat exchanger 20 to form a mixed gas. Part of the mixed gas is discharged into the atmosphere, while the remaining part is fed into the workshop, according to the workshop's supply and exhaust air ratio. If the temperature of the mixed gas entering the workshop fails to meet the workshop's comfortable supply air temperature requirements, the mixed gas entering the workshop is first passed through a second air-water heat exchanger 33 and cooled using a closed second cooling tower 34 before being fed back into the workshop. If a failure is detected in the operating biological waste gas purification treatment unit, an emergency switch to another unit is performed.

[0059] The indirect heat exchange fresh air mode system process is that the high-temperature process waste gas discharged from the spinning workshop first enters the waste gas biological purification treatment device for treatment and purification. If the temperature of the high-temperature waste gas discharged from the spinning workshop is higher than the threshold value of the inactivation temperature of the bacterial flora in the waste gas biological purification treatment device, the high-temperature process waste gas discharged from the spinning workshop will first pass through the first air-water heat exchanger 8, and the closed first cooling tower 3 will be used to reasonably cool the waste gas, and then it will be sent to the waste gas biological purification treatment device for treatment and purification. The oxidation exothermic effect accompanied by the biodegradation process of pollutants is used to reduce the temperature of the purified gas. After the temperature is significantly increased, it is sent to the heat source side channel of the indirect heat exchanger 23. At the same time, outdoor fresh air is introduced into the system by the fresh air fan 18 and enters the cold side channel of the same indirect heat exchanger as a cold source. It indirectly exchanges heat with the high-temperature purified air in the hot side channel. After the heat exchange is completed, the purified gas is directly discharged into the atmosphere. The preheated outdoor fresh air is directly sent to the workshop. If the temperature of the fresh air sent to the workshop cannot meet the workshop's comfortable air supply temperature requirements, the fresh air sent to the workshop will first pass through the second air-water heat exchanger 33 and be appropriately cooled by the closed second cooling tower 34 before being sent to the workshop. If a failure is detected in the operating exhaust gas biological purification treatment device, emergency switching to another operation is carried out.

[0060] Example 2 In a typical embodiment of the present invention, referring to Figure 1-Figure 2 As shown, a ventilation method for separating heat and toxins from exhaust gas in a spinning workshop and utilizing waste heat, adopts the ventilation system of Example 1, and includes the following steps: (1) The first step is to set target temperatures such as Tx and Ty (Tx is the temperature threshold for bacterial inactivation in the waste gas biological purification treatment device, and Ty is the comfortable air supply temperature in the workshop) (e.g., Tx = 46°C, Ty = 24°C).

[0061] (2) Real-time monitoring of the high-temperature gas temperature Tn discharged from the spinning workshop exhaust port 2, the exhaust gas temperature Tz after cooling through the first cooling tower 3, and the pollutant concentration detector 15 detecting the pollutant concentration of the purified gas discharged from the main exhaust gas biological purification treatment device 11 or the standby exhaust gas biological purification treatment device 12 , the temperature Th at the mixing point of the fresh air and the purified high-temperature exhaust gas downstream of the direct heat exchanger 20, the supply air temperature Tv after cooling through the second cooling tower 34, and the fresh air outlet temperature Tm of the indirect heat exchanger 23.

[0062] (3) According to the exhaust gas temperature Tn discharged from the spinning workshop exhaust port 2, if ( To ensure the activity of the colony, the buffer value is set according to the experiment (for example, Tn = 45 ° C, =5), then open the first cooling tower 3 and the corresponding first variable frequency water pump 7 and solenoid valve 4, solenoid valve 5, close the solenoid valve 6, so that the discharged high-temperature exhaust gas first enters the first air-water heat exchanger 8, and uses the first cooling tower 3 to properly cool the high-temperature exhaust gas. According to the exhaust gas temperature Tz after cooling by the first cooling tower 3, if (For example, Tz = 40 ° C), the temperature of the exhaust gas after being cooled by the first cooling tower 3 will not inactivate the bacteria in the main exhaust gas biological purification treatment device 11, open the corresponding solenoid valve 9, solenoid valve 13, close the solenoid valve 10, solenoid valve 14, so that the exhaust gas cooled by the first cooling tower 3 enters the exhaust gas biological purification treatment device 11 for treatment. If a failure of the exhaust gas biological purification treatment device 11 is detected, open the corresponding solenoid valve 10, solenoid valve 14, close the solenoid valve 9, solenoid valve 13, so that the exhaust gas cooled by the first cooling tower 3 enters the spare exhaust gas biological purification treatment device 12 for treatment. (For example, Tz = 44 ° C), the temperature of the exhaust gas after cooling through the first cooling tower 3 may also inactivate the bacteria in the exhaust gas biological purification treatment device 11. By adjusting the first variable frequency water pump 7, the temperature Tz of the exhaust gas after cooling through the first cooling tower 3 is adjusted; if (For example, Tn=40℃), the temperature of the exhaust gas discharged from the workshop will not inactivate the bacteria in the main exhaust gas biological purification treatment device 11, open the corresponding solenoid valve 6, solenoid valve 9, solenoid valve 13, close the solenoid valves 4, solenoid valve 5, solenoid valve 10, and solenoid valve 14, and directly send the exhaust gas into the main exhaust gas biological purification treatment device 11 for treatment. If it is monitored that the main exhaust gas biological purification treatment device 11 has a fault, open the corresponding solenoid valve 10 and solenoid valve 14, close the solenoid valve 9 and solenoid valve 13, and let the exhaust gas enter the standby exhaust gas biological purification treatment device 12 for treatment.

[0063] (4) Pollutant concentration of the exhaust gas from the waste gas biological purification treatment device monitored by the pollutant concentration detector 15 ,like <α (α is the pollutant concentration threshold of the gas that can be directly sent into the workshop, obtained from the specification) (for example, α=5mg / m 3 ), the gas purified from the main exhaust gas biological purification treatment device 11 can meet the workshop exhaust reuse air quality requirements, enter the direct heat exchange mixed air supply mode, turn on the fresh air fan 18 and the corresponding solenoid valve 17, solenoid valve 19, close the solenoid valve 21, solenoid valve 22, solenoid valve 27, so that the high-temperature purified exhaust gas and outdoor fresh air enter the direct heat exchange heat exchanger 20 for direct mixed heat exchange.

[0064] (5) Adjust the opening of the solenoid valve at the corresponding exhaust port 26 so that the purified gas after waste heat recovery is partially discharged. At the same time, open the corresponding solenoid valve 24 and solenoid valve 25 so that the remaining purified gas is mixed with the preheated outdoor fresh air downstream of the direct heat exchanger 20 and enters the air inlet pipe.

[0065] (6) According to the temperature Th of the mixing point of the fresh air and the purified high-temperature exhaust gas downstream of the direct heat exchanger 20, if Th-Ty>c (c is a buffer value set to avoid frequent start-up and shutdown of the cooling tower, determined according to experiments, for example, Th=30℃, c=1.5℃), the mixed air supply temperature does not meet the comfortable air supply temperature requirements of the workshop. Open the second cooling tower 34 and the corresponding second variable frequency water pump 32 and solenoid valve 30, solenoid valve 31, close the solenoid valve 29, and let the mixed air enter the second air-water heat exchanger 33 first. Use the second cooling tower 34 to properly cool the mixed air. According to the mixed air temperature Tv after cooling by the second cooling tower 34, if Tv-Ty<c (for example, Tv=25℃) , the temperature of the mixed air after cooling through the second cooling tower 34 meets the comfortable air supply temperature requirement of the workshop and is directly sent to the spinning workshop 1. If Tv-Ty>c (for example, Tv=28℃), the temperature of the mixed air after cooling through the second cooling tower 34 does not meet the comfortable air supply temperature requirement of the workshop. The second variable frequency water pump 32 is used to adjust the temperature Tv of the mixed air after cooling through the second cooling tower to meet Tv-Ty<c and then send it to the spinning workshop 1; if Th-Ty<c (for example, Th=24℃), the mixed air supply temperature meets the comfortable air supply temperature requirement of the workshop, the corresponding solenoid valve 29 is opened, and the solenoid valve 30 and the solenoid valve 31 are closed, and the mixed gas is directly sent into the spinning workshop 1.

[0066] (7) If >α (α is the pollutant concentration threshold of the gas that can be directly sent into the workshop, which can be obtained by checking the specifications, for example, α=5mg / m 3 ), the gas purified from the waste gas biological purification treatment device does not meet the workshop exhaust reuse air quality requirements, and enters the indirect heat exchange fresh air mode, turns on the fresh air fan 18 and the corresponding solenoid valve 21 and solenoid valve 22, and closes the solenoid valve 17, solenoid valve 19, solenoid valve 24, and solenoid valve 25, so that the high-temperature purified waste gas and the outdoor fresh air enter the indirect heat exchange heat exchanger 23 for indirect heat exchange, and the waste gas after heat exchange is directly discharged into the atmosphere from the exhaust port 28. At the same time, open the corresponding solenoid valve 27 to allow the fresh air after heat exchange to enter the air supply channel.

[0067] (8) According to the outlet temperature Tm of the indirect heat exchanger, if Tm-Ty>c (c is a buffer value set to avoid frequent start and stop of the cooling tower, determined according to experiments) (for example, Tm=30℃, c=1.5℃), the fresh air supply temperature does not meet the comfortable supply air temperature requirement of the workshop. Open the second cooling tower 34 and the corresponding second variable frequency water pump 32 and solenoid valve 30, solenoid valve 31, close the solenoid valve 29, and let the preheated fresh air enter the second air-water heat exchanger 33 first. Use the second cooling tower 34 to properly cool the preheated fresh air. According to the supply air temperature Tv after cooling by the cooling tower, if Tv-Ty<c (for example, Tv=25℃), then pass the second cooling tower 34. The temperature of the mixed air after cooling by the second cooling tower 34 meets the comfortable air supply temperature requirement of the workshop and is directly sent to the spinning workshop 1. If Tv-Ty>c (for example, Tv=28℃), the air supply temperature after cooling by the second cooling tower 34 does not meet the comfortable air supply temperature requirement of the workshop. The second variable frequency water pump 32 is used to adjust the air supply temperature Tv after cooling by the second cooling tower to meet Tv-Ty<c and then send it to the spinning workshop 1; if Tm-Ty<c (for example, Tm=24℃), the fresh air supply temperature meets the comfortable air supply temperature requirement of the workshop, the corresponding solenoid valve 29 is opened, and the solenoid valves 30 and 31 are closed, so that all the fresh air after heat exchange is directly sent into the spinning workshop 1.

[0068] The ventilation system operation control method for heat and toxic separation and efficient utilization of waste heat in spinning workshops proposed in this embodiment is based on multi-condition judgment and feedback adjustment of real-time monitoring parameters to ensure maximum recovery and utilization of waste heat resources under the premise of thoroughly purifying the waste gas and ensuring the safety of the workshop environment. It has good operation reliability and strong applicability.

[0069] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A ventilation system for separating heat and toxic substances from exhaust gas in a spinning workshop and utilizing waste heat, characterized in that: include: The waste gas biological purification treatment device has an inlet end connected to the exhaust outlet of the spinning workshop through an exhaust pipe, an outlet end connected to one end of the supply air pipe, and the other end of the supply air pipe is connected to one end of the inlet air pipe; the other end of the inlet air pipe is connected to the air inlet of the spinning workshop; the supply air pipe is sequentially provided with a pollutant concentration detector, a circulating fan and a heat exchanger; the heat exchanger includes a direct heat exchanger and an indirect heat exchanger connected in parallel between the circulating fan and the inlet air pipe, and the high-temperature gas is sent to different heat exchangers according to the concentration data detected by the pollutant concentration detector; The fresh air fan is connected to the direct heat exchanger and the indirect heat exchanger respectively.

2. A ventilation system for separating heat and toxic waste gas from spinning workshop and utilizing waste heat according to claim 1, characterized in that: The exhaust pipe is provided with a first temperature sensor for detecting the exhaust temperature at one end near the exhaust port. The exhaust pipe is also connected in parallel with a first heat exchange branch. The first heat exchange branch is provided with a first heat exchanger, and the first heat exchanger is connected to the first cooling tower through a circulation loop.

3. A ventilation system for separating heat and toxic waste gas from spinning workshop and utilizing waste heat according to claim 2, characterized in that: A second heat exchange branch is connected in parallel on the air inlet pipe. A second heat exchanger is provided on the second heat exchange branch. A fifth temperature sensor is provided at the outlet end. The second heat exchanger is connected to the second cooling tower through a circulation loop.

4. A ventilation system for separating heat and toxic waste gas from spinning workshop and utilizing waste heat according to claim 1, characterized in that: The waste gas biological purification treatment device comprises a main waste gas biological purification treatment device and a standby waste gas biological purification treatment device which are connected in parallel between the pollutant concentration detector and the exhaust pipe.

5. The ventilation system for separating heat and toxic substances from exhaust gas and utilizing waste heat in a spinning workshop according to claim 1 is characterized in that: The outlet end of the direct heat exchange heat exchanger is connected to the air inlet pipeline through two pipelines with solenoid valves to achieve direct mixing and heat exchange of high-temperature purified gas and fresh air before entering the air inlet pipeline. An exhaust port is provided on the pipeline for discharging purified gas from the direct heat exchange heat exchanger.

6. A ventilation system for separating heat and toxic waste gas from spinning workshop and utilizing waste heat according to claim 3, characterized in that: A second temperature sensor is provided at the outlet end of the first heat exchange branch; a third temperature sensor is provided at the two pipes on the air inlet pipe close to the outlet end of the direct heat exchange heat exchanger, for detecting the temperature of the mixture of high-temperature purified gas and fresh air.

7. A ventilation system for separating heat and toxic waste gas from spinning workshop and utilizing waste heat according to claim 6, characterized in that: The fresh air fan is connected to the cold side channel of the indirect heat exchanger, and the circulating fan is connected to the heat source side channel of the indirect heat exchanger. The purified gas after heat exchange is directly discharged into the atmosphere, and the preheated fresh air enters the air inlet pipe. A fourth temperature sensor is provided on the pipe between the outlet end of the cold side channel and the air inlet pipe.

8. The ventilation system for separating heat and toxic substances from exhaust gas and utilizing waste heat in a spinning workshop according to claim 3 is characterized in that: An electromagnetic valve is provided on the exhaust pipe between the two ends of the first heat exchange branch, and an electromagnetic valve is provided on the air inlet pipe between the two ends of the second heat exchange branch.

9. A ventilation system for separating heat and toxic substances from exhaust gas and utilizing waste heat in a spinning workshop according to claim 8, characterized in that: The first heat exchange branch and the second heat exchange branch are both provided with variable frequency water pumps.

10. A ventilation method for separating heat and toxic substances from exhaust gas in a spinning workshop and utilizing waste heat, characterized in that: The ventilation system according to claim 7 comprises the following steps: Detect the high-temperature gas temperature discharged from the exhaust port into the exhaust pipe. If it is higher than the set value, the high-temperature gas in the exhaust pipe enters the first parallel heat exchange branch on the exhaust pipe to cool down and then enters the exhaust gas biological purification treatment device for purification. If it is lower than the set value, it directly enters the exhaust gas biological purification treatment device for purification; The waste gas biological purification treatment device purifies the high-temperature gas and then discharges it into the air supply pipe. The pollutant concentration in the gas is detected by the pollutant concentration detector. If the concentration meets the standard, the purified high-temperature gas will be discharged into the direct heat exchanger. If the concentration does not meet the standard, the purified high-temperature gas will be discharged into the indirect heat exchanger. The fresh air fan will pass the outdoor fresh air into the corresponding heat exchanger for heat exchange; The temperature of the gas entering the air inlet pipeline after heat exchange is detected. If it is higher than the set value, the gas in the air inlet pipeline enters the second heat exchange branch connected in parallel on the air inlet pipeline for cooling and then enters the spinning workshop. If it is lower than the set value, it enters the spinning workshop directly.

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