A ventilation system and method for heat and poison separation and waste heat utilization of spinning plant exhaust gas

Abstract

The present application relates to the technical field of waste gas treatment in spinning workshop, and discloses a ventilation system and method for heat and toxin separation and waste heat utilization of waste gas in spinning workshop, wherein the high-temperature waste gas discharged from the exhaust port of the spinning workshop is first purified by a waste gas biological purification treatment device to realize heat and toxin separation, the temperature of the purified gas is raised by using the oxidation exothermic effect of the biological degradation of pollutants in the waste gas biological purification treatment device, and then the treated gas is heat-exchanged by a heat-exchange heat exchanger to realize safe and efficient recycling of waste heat, so that the waste heat resources are maximizedly recycled, the energy consumption of fresh air treatment in the workshop is reduced, and the overall energy efficiency and reliability of the system are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of spinning workshop waste gas treatment, and particularly relates to a ventilation system and method for heat-toxic separation and waste heat utilization of spinning workshop waste gas. BACKGROUND

[0002] In the production and operation of a spinning workshop, energy consumption and emission problems are highlighted, and a large amount of process waste heat is generated in the production process, which makes the spinning workshop have great potential in energy saving and emission reduction. Developing effective spinning workshop waste gas treatment and heat recovery technology can not only replace or reduce traditional energy consumption for workshop ventilation or process preheating, but also efficiently remove pollutants to protect environmental safety, which has significant economic benefits and environmental value for reducing enterprise operating costs, reducing carbon emissions and realizing green and sustainable development.

[0003] However, at present, the spinning workshop generally adopts the mode of directly discharging high-temperature waste gas for safety consideration, which causes great waste of waste heat resources and extremely low waste heat utilization rate. At the same time, the waste gas of the spinning workshop has the typical characteristics of "heat-toxic coexistence", that is, high-temperature waste heat and high-concentration and complex pollutants are deeply coupled. On the one hand, the waste heat equipment is easily eroded and damaged by pollutants, which seriously limits the recovery and utilization of waste heat. On the other hand, due to the coexistence of pollutants and waste heat, it is difficult to realize safe and effective "heat-toxic separation", thereby hindering the realization of efficient waste heat utilization. How to break through the shackles of "heat-toxic coexistence" without affecting the environmental safety of the workshop and realize efficient purification of pollutants and safe and efficient recovery and utilization of waste heat has become the key to restricting the energy efficiency improvement and green development of the spinning workshop. SUMMARY

[0004] In view of the deficiencies in the prior art, the purpose of the present application is to provide a ventilation system and method for heat-toxic separation and waste heat utilization of spinning workshop waste gas, which realizes an efficient "heat-toxic separation" mechanism of the spinning workshop, utilizes the oxidation exothermic effect of biological degradation of pollutants in the waste gas biological purification treatment device to improve the temperature of the purified gas, and ensures the continuous and safe operation of the system through the design of the parallel device, which not only realizes efficient purification of pollutants, but also separates waste heat from pollutants, creating conditions for subsequent waste heat utilization.

[0005] In order to achieve the above-mentioned purpose, the present application is realized by the following technical scheme:

[0006] In the first aspect, a ventilation system for heat-toxic separation and waste heat utilization of spinning workshop waste gas comprises:

[0007] The exhaust gas biological purification treatment device is characterized in that: an inlet end of the device is connected to an exhaust outlet of a spinning workshop through an exhaust pipeline, and an outlet end of the device is connected to one end of an air supply pipeline; the other end of the air supply pipeline is connected to one end of an air inlet pipeline; the other end of the air inlet pipeline is connected to an air inlet of the spinning workshop; a pollutant concentration detector, a circulating fan and a heat exchange type heat exchanger are sequentially arranged on the air supply pipeline; the heat exchange type heat exchanger comprises a direct heat exchange type heat exchanger and an indirect heat exchange type heat exchanger which are connected in parallel between the circulating fan and the air inlet pipeline; and the high-temperature gas is sent into different heat exchange type heat exchangers according to the concentration data detected by the pollutant concentration detector.

[0008] A fresh air machine is connected to the direct heat exchange type heat exchanger and the indirect heat exchange type heat exchanger, respectively.

[0009] As a further implementation, the exhaust pipeline is provided with a first temperature sensor for detecting the exhaust temperature at one end close to the exhaust outlet; a first heat exchange branch is further connected in parallel to the exhaust pipeline; a first heat exchanger is arranged on the first heat exchange branch; and the first heat exchanger is connected to a first cooling tower through a circulating loop.

[0010] As a further implementation, a second heat exchange branch is connected in parallel to the air inlet pipeline; a second heat exchanger is arranged on the second heat exchange branch; a fifth temperature sensor is arranged at the outlet end; and the second heat exchanger is connected to a second cooling tower through a circulating loop.

[0011] As a further implementation, the exhaust gas biological purification treatment device comprises a main exhaust gas biological purification treatment device and a standby exhaust gas biological purification treatment device which are connected in parallel between the pollutant concentration detector and the exhaust pipeline.

[0012] As a further implementation, the outlet end of the direct heat exchange type heat exchanger is connected to the air inlet pipeline through two pipelines provided with electromagnetic valves, so that the high-temperature purified gas and the fresh air are directly mixed and heat-exchanged before entering the air inlet pipeline; and an exhaust outlet is arranged on the pipeline through which the purified gas is discharged from the direct heat exchange type heat exchanger.

[0013] As a further implementation, a second temperature sensor is arranged at the outlet end of the first heat exchange branch; and a third temperature sensor is arranged at two pipelines close to the outlet end of the direct heat exchange type heat exchanger on the air inlet pipeline, for detecting the temperature of the mixed high-temperature purified gas and fresh air.

[0014] As a further implementation, the fresh air machine is connected to a cold side channel of the indirect heat exchange type heat exchanger; the circulating fan is connected to a heat source side channel of the indirect heat exchange type heat exchanger; the purified gas after heat exchange is directly discharged to the atmosphere; the preheated fresh air enters the air inlet pipeline; and a fourth temperature sensor is arranged on the pipeline between the outlet end of the cold side channel and the air inlet pipeline.

[0015] As a further implementation manner, an electromagnetic valve is arranged on the exhaust air pipeline between the two ends of the first heat exchange branch, and an electromagnetic valve is arranged on the intake air pipeline between the two ends of the second heat exchange branch.

[0016] As a further implementation manner, a variable frequency water pump is arranged on each of the first heat exchange branch and the second heat exchange branch.

[0017] In a second aspect, a ventilation method for heat and toxin separation of waste gas and waste heat utilization in a spinning workshop, using the ventilation system as described above, comprises the following steps:

[0018] The temperature of the high-temperature gas discharged from the exhaust air outlet into the exhaust air pipeline is detected, and if the temperature is higher than a set value, the high-temperature gas in the exhaust air pipeline enters the first heat exchange branch connected in parallel on the exhaust air pipeline to be cooled and then enters the waste gas biological purification treatment device for purification, and if the temperature is lower than the set value, the high-temperature gas directly enters the waste gas biological purification treatment device for purification.

[0019] After the waste gas biological purification treatment device purifies the high-temperature gas, the purified high-temperature gas is discharged into the air supply pipeline, and the pollutant concentration in the gas is detected by a pollutant concentration detector, and if the concentration meets the standard, the purified high-temperature gas is discharged into the direct heat exchange heat exchanger, and if the concentration does not meet the standard, the purified high-temperature gas is discharged into the indirect heat exchange heat exchanger, and the outdoor fresh air is introduced into the corresponding heat exchange heat exchanger by the fresh air machine for heat exchange.

[0020] The temperature of the gas in the intake air pipeline after heat exchange is detected, and if the temperature is higher than a set value, the gas in the intake air pipeline enters the second heat exchange branch connected in parallel on the intake air pipeline to be cooled and then enters the spinning workshop, and if the temperature is lower than the set value, the gas directly enters the spinning workshop.

[0021] The beneficial effects of the present application are as follows:

[0022] 1. The present application first purifies the high-temperature waste gas discharged from the exhaust air outlet of the spinning workshop by the waste gas biological purification treatment device, realizes "heat and toxin separation", uses the oxidation heat release effect of the biological degradation of pollutants in the waste gas biological purification treatment device to improve the temperature of the purified gas, and then uses the heat exchange heat exchanger to exchange heat, realizes safe and efficient recycling of waste heat, ensures complete purification of waste gas and safety of the workshop environment, maximizes recycling of waste heat resources, reduces energy consumption of fresh air treatment in the workshop, and improves the overall energy efficiency and reliability of the system.

[0023] 2. The application sets up parallel direct heat exchange heat exchanger and indirect heat exchange heat exchanger, according to the concentration of purified pollutants to determine the gas into the corresponding heat exchanger, for the gas, can be directly heat exchange in direct heat exchange heat exchanger, improve the heat exchange efficiency; in addition, the waste gas biological purification treatment device is arranged in parallel, when one of them fails, the other one is switched to work in the system; through the parallel device design to ensure the continuous and safe operation of the system, not only realizes the efficient purification of pollutants, but also separates the waste heat from the pollutants, creating conditions for subsequent waste heat utilization.

[0024] 3. The spinning workshop waste gas heat and poison separation and waste heat utilization ventilation method provided by the application designs a double-mode waste heat cascade utilization, which recovers waste heat efficiently while ensuring safety, has powerful system functions, strong energy-saving effect and strong practicality; multi-condition judgment and feedback regulation based on real-time monitoring parameters ensure that waste heat resources are maximized recovered and utilized under the premise of completely purifying waste gas and ensuring the safety of the workshop environment, and the operation reliability is good and the applicability is strong. BRIEF DESCRIPTION OF DRAWINGS

[0025] The drawings accompanying the specification of this application form a part of this application and serve to further understand the application. The schematic embodiments of the application and the description thereof are used to explain the application and do not constitute an improper limitation on the application.

[0026] Figure 1 is a structural schematic diagram of the ventilation system for waste gas heat and poison separation and waste heat utilization in the spinning workshop in the embodiment of the application;

[0027] Figure 2 is a flow chart of the ventilation method for waste gas heat and poison separation and waste heat utilization in the spinning workshop in the embodiment of the application.

[0028] In the drawings, the mutual distance or size is exaggerated to show the positions of various parts, and the schematic diagram is only illustrative.

[0029] In the drawings: 1. Spinning workshop, 2. Exhaust port, 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 waste gas biological purification treatment device, 12. Backup waste 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 port, 27. Solenoid valve, 28. Exhaust port, 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

[0030] It should be noted that the following detailed description is exemplary and is intended to provide further description of the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0031] Example One

[0032] In one exemplary embodiment of the present application, referring to Figures 1-2 As shown in the drawings, a ventilation system for heat and toxic separation and waste heat utilization of a spinning workshop, which is connected between the air inlet and air outlet of the spinning workshop 1 by corresponding purification structure, heat exchange structure and pipeline, and a machine room is arranged in the spinning workshop 1, and the corresponding structure of the ventilation system mainly comprises a waste 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.

[0033] The spinning workshop 1 is provided with an air inlet and an air outlet 2, and high-temperature gas carrying pollutants is discharged from the air outlet 2. The ventilation system purifies and cools the high-temperature gas carrying pollutants, so that the gas meeting the air inlet requirements reenters the spinning workshop 1 through the air inlet.

[0034] As shown in the drawings, the specific structure of the ventilation system for heat and toxic separation and waste heat utilization of the spinning workshop is arranged according to the gas flow direction, and the specific structure is arranged as follows: Figure 1

[0035] The air outlet 2 is connected to the waste gas biological purification treatment device through an air outlet pipeline; the waste gas biological purification treatment device is connected to the heat exchange heat exchanger through an air supply pipeline, and the heat exchange heat exchanger is connected to the air inlet of the spinning workshop 1 through an air inlet pipeline, thereby forming a circulating ventilation system.

[0036] Specifically, a first heat exchange branch is also connected in parallel at a position close to the air outlet 2 at the front end of the air outlet pipeline, the inlet end of the first heat exchange branch is provided with a solenoid valve 4, the outlet end is provided with a solenoid valve 5, and the air outlet pipeline between the inlet end and the outlet end of the first heat exchange branch is provided with a solenoid valve 6.

[0037] A first heat exchanger is arranged on the first heat exchange branch between the inlet end and the outlet end of the first heat exchange branch, and the first heat exchanger is specifically a first air-water heat exchanger 8, and the first air-water heat exchanger 8 is connected to the first cooling tower 3 through a first circulating cooling circuit with a first variable frequency water pump 7.

[0038] Further, the air outlet pipeline is connected to the waste gas biological purification treatment device at the end, and the waste gas biological purification treatment device comprises a main waste gas biological purification treatment device 11 and a standby waste gas biological purification treatment device 12 arranged in parallel with each other. ​

[0039] As Figure 1 shown, the exhaust pipe end and the main exhaust gas biological purification treatment device 11 inlet are provided with electromagnetic valve 9, the exhaust pipe end and the spare exhaust gas biological purification treatment device 12 inlet are provided with electromagnetic valve 10.

[0040] As Figure 1 shown, the exhaust gas biological purification treatment device is connected with the heat exchange type heat exchanger through the air supply pipeline:

[0041] The front end of the air supply pipeline is connected with the pipeline of the main exhaust gas biological purification treatment device 11 and the spare exhaust gas biological purification treatment device 12 outlet end, the pipeline of the main exhaust gas biological purification treatment device 11 outlet end is provided with electromagnetic valve 13, and the pipeline of the spare exhaust gas biological purification treatment device 12 outlet end is provided with electromagnetic valve 14.

[0042] In the normal state, electromagnetic valve 9 and electromagnetic valve 13 are opened, and electromagnetic valve 10 and electromagnetic valve 14 are closed, and the gas enters the main exhaust gas biological purification treatment device 11 for purification and removal. When the main exhaust gas biological purification treatment device 11 fails, electromagnetic valve 9 and electromagnetic valve 13 are closed, and electromagnetic valve 10 and electromagnetic valve 14 are opened, and the spare exhaust gas biological purification treatment device 12 participates in work, so the main exhaust gas biological purification treatment device 11 and the spare exhaust gas biological purification treatment device 12 are the same structure, and the purpose of parallel connection of the two is to prevent one of the exhaust gas biological purification treatment devices from failing.

[0043] The exhaust gas biological purification treatment device uses the domesticated and screened complex microbial flora to biodegrade the characteristic pollutants in the exhaust gas by constructing an environment suitable for microbial metabolism. The exhaust gas is first dissolved in the liquid phase or adsorbed on the surface of the biological membrane carrier through the gas-liquid / gas-solid mass transfer process in the exhaust gas biological purification treatment device, and then the microorganisms oxidize and decompose the pollutants as carbon source, nitrogen source or sulfur source, and convert them into carbon dioxide, water, inorganic salt and biomass, while generating heat, realizing efficient mineralization of pollutants and elimination of odor, and further improving the grade of waste heat.

[0044] The air supply pipeline is provided with pollutant concentration detector 15, circulating fan 16 and heat exchange type heat exchanger from front to back, wherein the circulating fan 16 can adopt a centrifugal circulating fan, which is used to provide power for gas circulation in the system and provide high air pressure to ensure effective circulation of air in the spinning workshop 1. The pollutant concentration detector 15 is used to detect the concentration of pollutants (mainly H2S and CS2) in the gas discharged to the air supply pipeline after being treated by the exhaust gas biological purification treatment device and passing through electromagnetic valve 13 or electromagnetic valve 14, so as to control the system operation mode.

[0045] The heat exchanger on the air supply pipeline includes a direct heat exchanger 20 and an indirect heat exchanger 23 arranged in parallel. The pollutant concentration detector 15 detects the pollutant concentration in the gas purified by the exhaust gas biological purification device, and determines whether the gas is introduced into the direct heat exchanger 20 or the indirect heat exchanger 23 according to the comparison between the detected concentration data and the set concentration.

[0046] Specifically, the circulating fan 16 is connected to the inlet end of the direct heat exchanger 20 through an air supply pipeline with an electromagnetic valve 17. It is also connected to the inlet end of the heat source side channel of the indirect heat exchanger 23 through a branch pipeline with an electromagnetic valve 21.

[0047] 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, and the fresh air fan 18 is connected to the inlet end of the direct heat exchanger 20 through a pipeline with an electromagnetic 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 an electromagnetic valve 22.

[0048] The purpose of the fresh air fan 18 is to introduce outdoor fresh air into the system to ensure that the amount of fresh air meets the national standard requirements to meet the needs of indoor air quality and personnel health.

[0049] The outlet end of the direct heat exchanger 20 is provided with an exhaust port 26 for discharging a set proportion of gas.

[0050] The indirect heat exchanger 23 is provided with an exhaust port 28, and the exhaust gas biological purification device processes the gas that does not meet the standard, i.e. the gas with a pollutant concentration higher than the set value, into the indirect heat exchanger 23 for indirect heat exchange, and the heat-exchanged gas is discharged from the exhaust port 28 without entering the system.

[0051] The gas that meets the standard is controlled by the corresponding valve and enters the direct heat exchanger 20 to be directly mixed and heat-exchanged with the outdoor fresh air introduced by the fresh air fan 18, greatly improving the heat exchange efficiency. After heat exchange, part of the treated gas enters the system, and part of the treated gas is discharged from the exhaust port 26.

[0052] The outlet end of the direct heat exchanger 20 is connected to the air inlet pipeline through a pipeline with an electromagnetic valve 25, and is also connected to the air inlet pipeline through a pipeline with an electromagnetic valve 24. The pipeline with the exhaust port 26 is connected to the pipeline with the electromagnetic valve 24.

[0053] The outlet end of the indirect heat exchange heat exchanger 23 is connected to the front end of the air inlet pipeline by a pipeline, the fresh air fan 18 drives the fresh air to enter the indirect heat exchange heat exchanger 23 through the electromagnetic valve 22, and the fresh air is in contactless heat exchange with the high-temperature gas that does not meet the treatment through the circulating fan 16 and the electromagnetic valve 21 entering the indirect heat exchange heat exchanger 23, the heat-exchanged gas is discharged from the air outlet 28, and the heat-exchanged fresh air enters the air inlet pipeline. The indirect heat exchange heat exchanger 23 can adopt a plate heat exchanger or a tube heat exchanger.

[0054] The electromagnetic valve 27 is arranged on the air inlet pipeline between the outlet end of the indirect heat exchange heat exchanger 23 and the pipeline with the electromagnetic valve 25. When the electromagnetic valve 27 is closed, the indirect heat exchange heat exchanger 23 does not participate in the circulation.

[0055] Further, the heat exchange structure is also arranged on the air inlet pipeline close to the air inlet of the spinning workshop 1. Specifically, a second heat exchange branch is also connected in parallel at the position close to the air inlet of the spinning workshop 1 at the end of the air inlet pipeline, the air inlet end of the second heat exchange branch is provided with the electromagnetic valve 30, the air outlet end is provided with the electromagnetic valve 31, and the electromagnetic valve 29 is arranged on the air inlet pipeline between the air inlet end and the air outlet end of the second heat exchange branch.

[0056] The second air-water heat exchanger 33 is arranged on the second heat exchange branch between the air inlet end and the air outlet end of the second heat exchange branch, and the first air-water heat exchanger 33 is connected with the second cooling tower 34 through the second circulating cooling circuit with the second variable frequency water pump 32.

[0057] The temperature sensor is also arranged in the embodiment, wherein the first temperature sensor is arranged on the air outlet pipeline close to the air outlet 2 to monitor the temperature of the exhaust gas discharged from the air outlet of the spinning workshop in real time, and the temperature at this position is represented as Tn.

[0058] The second temperature sensor is arranged downstream of the electromagnetic valve 5 at the outlet end of the first heat exchange branch, and the temperature detected at this position is represented as the temperature Tz of the exhaust gas cooled by the first cooling tower 3.

[0059] The third temperature sensor is arranged at the mixing point of the fresh air and the purified high-temperature exhaust gas downstream of the direct heat exchange heat exchanger 20, specifically at the position downstream of the electromagnetic valve 24 at the hot side outlet end of the direct heat exchange heat exchanger 20 and the air inlet pipeline. The temperature at this position is represented as Th.

[0060] The fourth temperature sensor is arranged on the outlet pipeline of the cold side channel of the indirect heat exchange heat exchanger 23, and the temperature at this position is represented as Tm. The fifth temperature sensor is arranged downstream of the electromagnetic valve 31 at the outlet end of the second heat exchange branch, and the temperature at this position is represented as Tv.

[0061] In addition, Tx is set as the temperature threshold value of the inactivation of the bacterial colony in the exhaust gas biological purification treatment device, and Ty is set as the comfortable supply air temperature of the workshop.

[0062] Specifically, by acquiring the temperature Tn, it is judged according to Tx whether the first air-water heat exchanger 8 on the first heat exchange branch needs to participate in heat exchange, to cool the 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 population in the exhaust 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 exhaust gas is reasonably cooled by the closed first cooling tower 3, and then sent into the exhaust gas biological purification treatment device for treatment and purification.

[0063] According to the temperature Tz of the exhaust gas cooled by the first cooling tower 3, the frequency conversion water pump is adjusted to adjust the temperature of the exhaust gas cooled by the cooling tower.

[0064] Similarly, the temperature Tv detected on the second heat exchange branch is used to judge whether the temperature of the treated gas can enter the spinning workshop.

[0065] In this embodiment, the high-temperature exhaust gas discharged from the exhaust port 2 of the spinning workshop is first purified by the exhaust gas biological purification treatment device to realize heat and poison separation, and then the treated gas is heat-exchanged by the heat-exchange heat exchanger to realize safe and efficient recycling of waste heat, so as to maximize the recycling of waste heat resources, reduce the new air treatment energy consumption of the workshop, and improve the overall energy efficiency and reliability of the system.

[0066] The heat-exchange heat exchanger includes a direct heat-exchange heat exchanger 20 and an indirect heat-exchange heat exchanger 23 arranged in parallel, when the concentration of pollutants in the purified exhaust gas meets the standard, the direct heat-exchange mixed air supply can be used; when the concentration of pollutants in the purified exhaust gas does not meet the standard, the indirect heat-exchange fresh air can be used.

[0067] Specifically, the system has two operating modes of direct heat-exchange mixed air supply 20 and indirect heat-exchange fresh air 23 according to the concentration of pollutants in the purified gas.

[0068] The system flow of the direct heat-exchange mixed air supply mode is that the high-temperature process exhaust gas discharged from the exhaust port 2 of the spinning workshop 1 is first treated and purified by the exhaust gas biological purification treatment device, 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 population in the exhaust 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 exhaust gas is reasonably cooled by the closed first cooling tower 3, and then sent into the exhaust gas biological purification treatment device for treatment and purification.

[0069] The temperature of the purified gas is significantly increased by using the oxidation exothermic effect accompanying the biodegradation of pollutants, and the gas is sent to the direct heat exchanger 20. Outdoor fresh air is introduced into the system by the fresh air fan 18, and is used as a cold source to enter the same direct heat exchanger 20, and is mixed and exchanged with the high-temperature purified gas. The preheated outdoor fresh air and the purified gas after heat exchange are mixed at the outlet end of the direct heat exchanger 20, and form a mixed gas. Part of the mixed gas is discharged into the atmosphere according to the workshop exhaust ratio, and the other part is sent into the workshop. If the temperature of the mixed gas sent into the workshop cannot meet the comfort temperature requirement of the workshop, the mixed gas is first sent through the second air-water heat exchanger 33, and is cooled by the closed second cooling tower 34 before being sent into the workshop. If a failure is detected in the running waste gas biological purification treatment device, the system is switched to another running device.

[0070] In the indirect heat exchange all-fresh air mode system, the high-temperature process waste gas discharged from the spinning workshop is first sent to 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 population in the waste gas biological purification treatment device, the high-temperature process waste gas is first sent through the first air-water heat exchanger 8, and is cooled by the closed first cooling tower 3 before being sent to the waste gas biological purification treatment device for treatment and purification. The temperature of the purified gas is significantly increased by using the oxidation exothermic effect accompanying the biodegradation of pollutants, and the gas is sent to the heat source side channel of the indirect heat exchanger 23. Outdoor fresh air is introduced into the system by the fresh air fan 18, and is used as a cold source to enter the same indirect heat exchanger, and is indirectly exchanged with the high-temperature purified gas in the hot side channel. The purified gas after heat exchange is directly discharged into the atmosphere. The preheated outdoor fresh air is directly sent into the workshop. If the temperature of the fresh air sent into the workshop cannot meet the comfort temperature requirement of the workshop, the fresh air is first sent through the second air-water heat exchanger 33, and is cooled by the closed second cooling tower 34 before being sent into the workshop. If a failure is detected in the running waste gas biological purification treatment device, the system is switched to another running device.

[0071] Example Two

[0072] In a typical embodiment of the present application, referring to Figures 1-2 A ventilation method for separating waste gas and heat from a spinning workshop and utilizing waste heat, which uses the ventilation system of Example One, includes the following steps:

[0073] (1) First, set the target temperatures Tx and Ty (Tx is the temperature threshold value of the inactivation of the bacterial population in the waste gas biological purification treatment device, and Ty is the comfort temperature of the workshop) (for example, Tx = 46°C and Ty = 24°C).

[0074] (2) Real-time monitoring of the temperature Tn of the high-temperature gas discharged from the spinning workshop exhaust port 2, the temperature Tz of the exhaust gas cooled by the first cooling tower 3, 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 detected by the pollutant concentration detector 15 , the temperature Th of the mixing point of the fresh air and the purified high-temperature exhaust gas downstream of the direct heat exchange heat exchanger 20, the temperature Tv of the supply air cooled by the second cooling tower 34, and the temperature Tm of the fresh air outlet of the indirect heat exchange heat exchanger 23.

[0075] (3) According to the temperature Tn of the exhaust gas discharged from the spinning workshop exhaust port 2, if a buffer value set to ensure the activity of the bacterial colony determined according to experiments) (for example, Tn = 45℃, = 5), the first cooling tower 3 and the corresponding first variable frequency water pump 7, electromagnetic valve 4, and electromagnetic valve 5 are opened, and the electromagnetic valve 6 is closed, so that the discharged high-temperature exhaust gas first enters the first air-water heat exchanger 8, and the first cooling tower 3 is used to cool the high-temperature exhaust gas. According to the exhaust gas temperature Tz cooled by the first cooling tower 3, if (for example, Tz = 40℃), the exhaust gas temperature cooled by the first cooling tower 3 will not cause the bacterial colony in the main exhaust gas biological purification treatment device 11 to be inactivated, the corresponding electromagnetic valve 9 and electromagnetic valve 13 are opened, and the electromagnetic valve 10 and electromagnetic valve 14 are closed, so that the exhaust gas cooled by the first cooling tower 3 enters the exhaust gas biological purification treatment device 11 for treatment. If it is monitored that the exhaust gas biological purification treatment device 11 fails, the corresponding electromagnetic valve 10 and electromagnetic valve 14 are opened, and the electromagnetic valve 9 and electromagnetic valve 13 are closed, so that the exhaust gas cooled by the first cooling tower 3 enters the standby exhaust gas biological purification treatment device 12 for treatment. If (for example, Tz = 44℃), the exhaust gas temperature cooled by the first cooling tower 3 may also cause the bacterial colony in the exhaust gas biological purification treatment device 11 to be inactivated, and the exhaust gas temperature Tz cooled by the first cooling tower 3 is adjusted by adjusting the first variable frequency water pump 7. If (for example, Tn = 40℃), the temperature of the exhaust gas discharged from the spinning workshop will not cause the bacterial colony in the main exhaust gas biological purification treatment device 11 to be inactivated, the corresponding electromagnetic valve 6, electromagnetic valve 9, and electromagnetic valve 13 are opened, and the electromagnetic valve 4, electromagnetic valve 5, electromagnetic valve 10, and electromagnetic valve 14 are closed, so that the exhaust gas is directly sent to 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 fails, the corresponding electromagnetic valve 10 and electromagnetic valve 14 are opened, and the electromagnetic valve 9 and electromagnetic valve 13 are closed, so that the exhaust gas enters the standby exhaust gas biological purification treatment device 12 for treatment.

[0076] (4) According to the pollutant concentration of the exhaust gas discharged from the exhaust gas biological purification treatment device monitored by the pollutant concentration detector 15​ , if < α (α is the threshold value of the concentration of pollutants contained in the gas that can be directly sent to the workshop, which can be obtained by consulting the specification) (for example, α = 5 mg / m 3 ), the gas purified from the main waste gas biological purification treatment device 11 can meet the air quality requirements of the workshop exhaust air reuse, enter the direct heat mixing air supply mode, open the fresh air fan 18 and the corresponding electromagnetic valve 17, electromagnetic valve 19, close the electromagnetic valve 21, electromagnetic valve 22, electromagnetic valve 27, and make the high-temperature purified waste gas and outdoor fresh air enter the direct heat exchanger 20 for direct mixing and heat exchange.

[0077] (5) Adjust the opening of the electromagnetic valve at the corresponding exhaust port 26 so that part of the purified gas after waste heat recovery is discharged, and at the same time open the corresponding electromagnetic valve 24, electromagnetic valve 25, so that the remaining purified gas mixes with the preheated outdoor fresh air downstream of the direct heat exchanger 20, and enters the air inlet pipeline.

[0078] (6) According to the temperature Th of the mixing point of the fresh air downstream of the direct heat exchanger 20 and the purified high-temperature waste gas, if Th-Ty > c (c is a buffer value set to avoid frequent start and stop of the cooling tower, which is determined according to experiments, for example, Th = 30°C, c = 1.5°C), the mixed air supply temperature does not meet the requirements of the workshop comfortable air supply temperature, open the second cooling tower 34 and the corresponding second variable frequency water pump 32 and electromagnetic valve 30, electromagnetic valve 31, close the electromagnetic valve 29, make the mixed air first enter the second air-water heat exchanger 33, and use the second cooling tower 34 to cool the mixed air appropriately, according to the temperature Tv of the mixed air cooled by the second cooling tower 34, if Tv-Ty < c (for example, Tv = 25°C), the temperature of the mixed air cooled by the second cooling tower 34 meets the requirements of the workshop comfortable air supply temperature, and is directly sent to the spinning workshop 1, if Tv-Ty > c (for example, Tv = 28°C), the temperature of the mixed air cooled by the second cooling tower 34 does not meet the requirements of the workshop comfortable air supply temperature, adjust the temperature Tv of the mixed air cooled by the second cooling tower through the second adjusting variable frequency water pump 32, so that it meets the requirement of Tv-Ty < c, and then enters the spinning workshop 1; if Th-Ty < c (for example, Th = 24°C), the mixed air supply temperature meets the requirements of the workshop comfortable air supply temperature, open the corresponding electromagnetic valve 29, close the electromagnetic valve 30, electromagnetic valve 31, and directly make the mixed gas enter the spinning workshop 1.

[0079] (7) if > α (α is the threshold value of the concentration of pollutants contained in the gas that can be directly sent to the workshop, which can be obtained by consulting the specification, for example, α = 5 mg / m 3If the gas purified from the waste gas biological purification treatment device does not meet the air quality requirement of the workshop exhaust air recycling, enters the indirect heat exchange fresh air mode, opens the fresh air fan 18 and the corresponding electromagnetic valve 21, electromagnetic valve 22, closes the electromagnetic valve 17, electromagnetic valve 19, electromagnetic valve 24, electromagnetic valve 25, and makes the high-temperature purified waste gas and outdoor fresh air enter the indirect heat exchange heat exchanger 23 for indirect heat exchange, the waste gas after heat exchange is directly discharged into the atmosphere from the exhaust port 28, and at the same time, the corresponding electromagnetic valve 27 is opened, so that the fresh air after heat exchange enters the air supply channel.

[0080] (8) According to the fresh air outlet temperature Tm of the indirect heat exchange heat exchanger, if Tm-Ty>c (c is a buffer value set to avoid frequent start and stop of the cooling tower, which is determined according to experiments) (for example, Tm=30℃, c=1.5℃), the fresh air supply temperature does not meet the workshop comfortable air supply temperature requirement, the second cooling tower 34 and the corresponding second variable frequency water pump 32 and electromagnetic valve 30, electromagnetic valve 31 are opened, and the electromagnetic valve 29 is closed, so that the preheated fresh air first enters the second air-water heat exchanger 33, and the second cooling tower 34 is used to cool the preheated fresh air. According to the supply air temperature Tv after cooling of the cooling tower, if Tv-Ty<c (for example, Tv=25℃), the mixed air temperature after cooling by the second cooling tower 34 meets the workshop comfortable air supply temperature requirement, and is directly sent to the spinning workshop 1. If Tv-Ty>c (for example, Tv=28℃), the supply air temperature after cooling by the second cooling tower 34 does not meet the workshop comfortable air supply temperature requirement, and the second cooling tower cooling supply air temperature Tv is adjusted by the second adjusting variable frequency water pump 32, so that it meets Tv-Ty<c and is then sent to the spinning workshop 1. If Tm-Ty<c (for example, Tm=24℃), the fresh air supply temperature meets the workshop comfortable air supply temperature requirement, the corresponding electromagnetic valve 29 is opened, and the electromagnetic valves 30 and 31 are closed, so that the fresh air after heat exchange is directly sent into the spinning workshop 1.

[0081] The running control method of the spinning workshop waste gas heat and poison separation and waste heat efficient utilization ventilation system provided in the embodiment is based on multi-condition judgment and feedback regulation of real-time monitoring parameters, ensures that the waste gas is completely purified and the workshop environment safety is ensured, maximizes the recycling of waste heat resources, has good running reliability, and has strong applicability.

[0082] The above only describes the preferred embodiments of the present application and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A ventilation system for heat and toxic separation and waste heat utilization of spinning plant exhaust gas, characterized in that, include: The waste gas biological purification treatment device has an inlet end connected to the exhaust vent of the spinning workshop via an exhaust duct, an outlet end connected to one end of a supply duct, and the other end of the supply duct connected to one end of an inlet duct. The other end of the inlet duct is connected to the air inlet of the spinning workshop. The supply duct is sequentially equipped 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 duct. The high-temperature gas is sent to different heat exchangers based on the concentration data detected by the pollutant concentration detector. The exhaust duct is equipped with a first temperature sensor for detecting the exhaust temperature at one end near the exhaust outlet. A first heat exchange branch is also connected in parallel on the exhaust duct. A first heat exchanger is provided on the first heat exchange branch. The first heat exchanger is connected to the first cooling tower through a circulation loop. 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 duct. The fresh air unit is connected to a direct heat exchanger and an indirect heat exchanger respectively. The outlet end of the direct heat exchanger is connected to the air inlet pipe through two pipes with solenoid valves, so as to realize that the high temperature purified gas and fresh air are directly mixed and heat exchanged before entering the air inlet pipe. The pipe on which the purified gas is discharged from the direct heat exchanger is equipped with an exhaust port. The fresh air unit 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 duct.

2. The ventilation system for heat and fume separation and waste heat utilization in a spinning plant according to claim 1, characterized in that, A second heat exchange branch is connected in parallel on the air inlet duct. A second heat exchanger is installed on the second heat exchange branch, and a fifth temperature sensor is installed at the outlet end. The second heat exchanger is connected to the second cooling tower through a circulation loop.

3. The ventilation system for heat and fume separation and waste heat utilization in a spinning plant according to claim 2, characterized in that, A second temperature sensor is installed at the outlet end of the first heat exchange branch; a third temperature sensor is installed at the two pipelines on the air inlet pipeline near the outlet end of the direct heat exchanger, which is used to detect the temperature of the high-temperature purified gas and fresh air after mixing.

4. The ventilation system for heat and fume separation and waste heat utilization in a spinning plant according to claim 3, characterized in that, A fourth temperature sensor is installed on the pipe between the cold side channel outlet and the air inlet pipe.

5. The ventilation system for heat and fume separation and waste heat utilization in a spinning plant according to claim 2, characterized in that, A solenoid valve is installed on the exhaust pipe between the two ends of the first heat exchange branch, and a solenoid valve is installed on the inlet pipe between the two ends of the second heat exchange branch.

6. The ventilation system for heat and fume separation and waste heat utilization of spinning plant according to claim 5, characterized in that, Both the first heat exchange branch and the second heat exchange branch are equipped with variable frequency water pumps.

7. A ventilation method for heat and poison separation and waste heat utilization of spinning plant exhaust gas, characterized in that, The ventilation system as described in claim 4 includes the following steps: The temperature of the high-temperature gas discharged from the exhaust vent into the exhaust duct is detected. If it is higher than the set value, the high-temperature gas in the exhaust duct enters the first heat exchange branch connected in parallel in the exhaust duct to cool down and then enters the waste gas biological purification treatment device for purification. If it is lower than the set value, it directly enters the waste gas biological purification treatment device for purification. After the waste gas biological purification treatment device purifies the high-temperature gas, it is discharged into the air supply pipeline. The concentration of pollutants in the gas is detected by the pollutant concentration detector. If the concentration meets the standard, the purified high-temperature gas is discharged into the direct heat exchanger. If the concentration does not meet the standard, the purified high-temperature gas is discharged into the indirect heat exchanger. The fresh air unit introduces outdoor fresh air into the corresponding heat exchanger for heat exchange. The temperature of the gas after heat exchange is detected. If the temperature is higher than a set value, the gas in the air inlet pipeline enters a second heat exchange branch connected in parallel to the air inlet pipeline and then enters the spinning workshop after being cooled. If the temperature is lower than the set value, the gas directly enters the spinning workshop.

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