TW201912236A - VOC processing system, controller thereof and operating method thereof - Google Patents

Abstract

The invention provides an operation method of a volatile organic compound (VOC) processing system. The processing system comprises an adsorption roller, a heater, a driving fan, a plurality of gas pipelines connected to different areas on the adsorption roller, and at least one valve of the gas pipeline located at an upstream or downstream of the heater. The operation method of the VOC processing system comprises a first working stage and a second working stage, wherein the first working stage and the second working stage are alternately circulated, The gas to be treated is introduced into the adsorption region of the adsorption roller in the first working stage, and the valve is turned off or reduced so that no or only a small amount of air flow flows through the heater. The power inputted into the heater is a first power so that the internal temperature of the heater is lower than the desorption temperature and is higher than the standby temperature. The gas to be treated in the second working stage is continuously introduced into the adsorption region of the adsorption roller, and the valve is opened so as to enable the air flow to flow into the heater and flow into a desorption area on the adsorption roller. The power inputted into the heater is a second power so that the gas flow outputted by the heater is capable of removing volatile organic compounds (VOC) adsorbed in the desorption area, wherein the second power is greater than the first power. The time length of the first working stage is larger than the time length of the second working stage.

Description

VOC processing system, its controller and operation method

The present invention relates to gas cleaning equipment and methods, and in particular, to a technology for cleaning volatile organic gases during processing, which can greatly save energy consumption while maintaining efficient purification of gases.

In a coating factory, a semiconductor factory, or a printing factory, a large amount of organic solvents are used, and the organic solvents easily volatilize gaseous volatile organic compounds (VOCs) into the air. As we all know, the VOC discharged from the factory into the atmosphere reacts with sunlight and ozone to form harmful organic particles and increase the ozone concentration in the atmosphere, which has a bad impact on the atmospheric environment. At the same time, It can adversely affect the physical health of workers exposed to VOCs in the factory. Therefore, VOCs produced in industrial production must be treated before they can be discharged into the atmosphere or recycled into the plant's workshop.

VOC-containing gases are widely used in conventional technologies to treat the VOC-containing gas. The porous nature of the adsorbent can be used to physically adsorb volatile organic gases, odors, or toxic gases in industrial exhaust, and adsorb them to the adsorbent. In order to purify the exhaust gas in the industry. However, after the adsorbent is saturated, it must be re-used through the regeneration process to remove the adsorbed substances (such as volatile organic molecules, high-boiling chemical substances, etc.) filled in the adsorbent. The adsorption roller adsorption system is a continuous online regeneration operating system that has been successfully developed in recent years. As shown in Fig. 1a, the conventional VOC gas treatment system includes an adsorption roller and a plurality of isolated gas supply pipes to realize the adsorption purification of exhaust gas and the concentration and treatment of VOC components. The VOC gas processing system includes a processing gas inlet pipe F0, which passes the gas to be processed containing VOC components into the adsorption area 20 in the roller, and after passing through the adsorption roller, it is transported to the gas requiring purification gas through the processing gas exhaust pipe F1. space. A processing fan 10 is connected in series to the processing gas inlet pipe F0, and is used to drive a large amount of gas into the adsorption roller. The cooling gas inlet pipe F2a shunts part of the gas from the processing gas inlet pipe F0 through the cooling area 24 of the adsorption roller, and flows into the heater through the cooling gas outlet pipe F2b to be heated, so that the cooling gas is heated enough to desorb the roller. If the temperature is above 200 ° C, a desorption gas is formed. The desorption gas flows into the desorption region 22 of the adsorption roller through the desorption inlet pipe F3b, so that the VOC components adsorbed on the roller are desorbed and become exhaust gas containing high concentration of VOC. These exhaust gases pass through the desorption exhaust pipe F3a and are connected in series with the desorption The driving fan 30 attached to the exhaust duct is sent to the next processing equipment. Figure 1b is a side view of the adsorption roller in Figure 1a. As shown in the figure, the adsorption roller is cylindrical. The roller is divided into three regions by a plurality of isolated gas pipes. The largest area is connected with the processing gas pipe. The adsorption region 20 is in communication with the cooling gas duct as a cooling region 24 and in communication with the desorption gas duct is a desorption region 22. By driving the adsorption roller to rotate at a certain speed, when the industrial exhaust gas containing volatile organic components or toxic compounds passes through the adsorption area of the adsorption roller, the adsorbent on the adsorption roller adsorbs volatile organic substances or toxic substances to achieve exhaust gas purification. purpose. When the adsorption roller is turned into the desorption regeneration region (also known as the desorption region), the heating device heats a regeneration airflow and transports it to the desorption regeneration region for desorbing the volatile organic substances on the surface of the adsorption roller. To regenerate the adsorption area for continued use, the desorbed concentrated exhaust gas is led to the next step of the incinerator for combustion and decomposition, or introduced into the condenser for condensation recovery. In order to heat the regeneration gas to a temperature capable of desorbing volatile organic substances, the heating device usually needs to provide a large heating power (such as several tens of kilowatts), and because the factory's volatile organic substances are generated throughout the day, A continuously heated heating device consumes a large amount of electricity, increasing the cost of the plant.

Therefore, the operation effect of the VOC gas treatment system in the conventional technology can be guaranteed. The most serious problem is that the energy consumption is too high. How to achieve the adsorption and desorption of VOC components in the air with less energy consumption is the core that the industry needs to solve urgently technical challenge.

Because the conventional technology has the above-mentioned problems, the present invention proposes to use a VOC purification device that is regenerated on demand and can be intermittently heated, which can effectively solve a large number of serious problems of high energy consumption in the conventional technology.

The present invention solves the above-mentioned problem by the following technical solution: The energy-saving technology mentioned firstly proposes the use of discontinuous operation mode in continuous operation and strict heat recovery VOC removal equipment, and a method and device for implementing this mode. On-demand regeneration and energy saving are achieved through effective and timely control of the wind speed of the regenerative fan and the temperature of the regenerative heater. Not all existing VOC devices have the capabilities to start up and run. The key of the on-demand regeneration technology is to continuously monitor the operating efficiency and energy consumption of the equipment by using a VOC detector with online monitoring. The device controller must be able to efficiently process the parameters collected by the VOC detector and various detectors, and adjust and control the start-up, working time and frequency of the regeneration device in a timely manner, so that the entire VOC removal device is highly intelligent. The various valves (V3, V4) of the heater air inlet and air outlet, and the bypass three-way valve V3 that may be used when switching between the first working phase and the second working phase, will play a role in controlling borrowing at different stages. The regenerative air volume of the heater can be used to heat the regenerative air volume as required and control the heat energy loss of the heater in the non-regeneration phase. The temperature of the heater is not constant for all existing VOC removal equipment after starting the equipment, but can be regular according to the set value in a complete regeneration cycle, that is, a cycle including heating, constant temperature and cooling. Change to reach the most effective regeneration and the most effective energy saving. The air volume of the regenerative fan is not that all the existing VOC-removing equipment is always the same after starting the equipment, but can be regular according to the set value in a complete regeneration cycle, that is, a cycle including heating, constant temperature and cooling. Change to reach the most effective regeneration and the most effective energy saving.

It should be understood that these summary are only used to illustrate the present invention and not to limit the scope of the present invention. In addition, it should be understood that after reading the disclosure of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope of the patent application attached to this application.

The device and method of the present invention will be described below with reference to specific embodiments and drawings. It should be emphasized that this is only an exemplary description and does not exclude other embodiments using the present invention.

The inventor found through research that the conventional technology needs to continuously heat the air with a heater to desorb the VOC components on the desorption area 22 in order to prevent the excessive accumulation of VOC components adsorbed on the adsorption roller to reach saturation, leading to a decrease in the adsorption rate. That is, a part of the VOC components in the gas to be processed flows through the adsorption region 20 of the adsorption roller and is not effectively adsorbed, but flows through the processing gas exhaust pipe F1 to a space requiring clean air. The research by the inventors found that, in fact, in the case where the concentration of the gas to be treated is very low and the adsorption and storage capacity of the adsorption roller is high, the desorption region 22 will not be desorbed for a certain period of time and will not cause the adsorption rate to decrease. Because the VOC concentration in the gas to be processed will change, the thicker the adsorption roller, although it can increase the storage capacity of the adsorption roller, it will also increase the resistance of the air flow. A larger volume VOC processing system and a higher power processing fan 10 are required. And the thicker the roller, the greater the temperature difference between the inflow end and the outflow end of the high-temperature gas in the desorption area during the desorption process, which will cause the temperature of the inflow end of the adsorption roller near the desorption inlet pipe F3b to quickly reach the target temperature of 200 However, the temperature of the outflow end of the adsorption roller near the desorption exhaust pipe F3a is still below 150 degrees and cannot be completely desorbed. Based on the above reasons, the thickness of the adsorption roller, that is, the adsorption and storage capacity of the adsorption roller is limited. The rotation speed of the adsorption roller in the conventional technology is about 5 revolutions / hour, that is, the entire adsorption roller is desorbed every 12 minutes. This desorption period is a parameter calculated based on the theoretical maximum VOC concentration and the minimum roller adsorption capacity. It can ensure that the adsorption rate does not decrease in the normal parameter range. However, in practical use, the VOC concentration contained in the gas to be treated is far below the theoretical maximum in most applications. The adsorption roller can also be selected to have a larger thickness. Therefore, in the conventional technology, continuous heating is used to obtain high-temperature gas for degassing. Attached will cause great energy waste.

Based on the above findings, the inventors propose a VOC processing system capable of intermittent desorption, and a corresponding VOC processing system operation method. FIG. 2 shows the VOC processing system of the present invention. The VOC processing system of the present invention includes a cooling gas outlet pipe F2b and VOC concentration sensors 41 and 43. The cooling gas outlet pipe F2b includes two branch pipes F41 and F42. The branch pipe F41 is connected to a three-way valve V3 on the desorption inlet pipe F3b. A valve V4 is connected in series to the branch pipe F42. The valve V4 is connected to the heater downstream. . The heater heats the gas from the branch pipe F42 and outputs a high-temperature desorption gas, and enters the desorption region 22 of the adsorption roller through the valve V3. The concentration sensor 41 of the two concentration sensors is provided in the processing gas inlet pipe F0, and can detect the concentration of the VOC component in the input gas to be processed. The concentration sensor 43 is provided in the processing gas exhaust pipe F1, and is used for Detect the VOC component concentration in the output gas.

The operation process of the VOC processing system of the present invention includes a first working phase and a second working phase. In the first working phase, the VOC processing system only adsorbs VOC components and does not perform desorption. In the second working phase, the adsorption roller is desorbed. The desorption of the VOC component by the attachment area and the adsorption of the VOC component by the adsorption area are performed simultaneously. In the first working stage, the processing fan 10 drives a large amount of the gas to be processed into the adsorption region 20 of the adsorption roller. Two VOC concentration sensors detect the concentration of VOC components flowing into and out of the adsorption region 20 of the adsorption roller, and at the same time, it is turned off as shown in FIG. 2 The valves V3 and V4 in the VOC processing system make no gas flow in the cooling gas inlet pipe F2a, the cooling gas outlet pipe F2b, the desorption exhaust pipe F3a, and the desorption inlet pipe F3b. At this time, there is no cooling gas in the cooling area 24 Flowing through, the heater does not need to input high power to heat the flowing gas. The two valves V3 and V4 at both ends of the heater are closed to form a closed space in the heater. Only a small amount of power Pl is required. It can ensure that the heating wire in the heater maintains a sufficient hot-start standby temperature (such as 210 degrees). As long as the high heating power Ph is transmitted at the standby temperature, the heating wire can quickly reach 300 degrees to 400 degrees, The desorption gas is heated to about 200 degrees. If the small input power Pl is not maintained during the long standby period, the heating wire will naturally cool to room temperature, and it will take more than half an hour to reach the required high temperature with high power heating. If the response speed is too slow, it will cause partial adsorption and saturation of the roller area. Can not be desorbed in time, and the adsorption rate is reduced.

When the VOC concentration in the gas to be processed is higher, the time for the adsorption roller to saturate will be shorter. When the saturation time is as short as 1 hour to 2 hours, the heating wire in the heater is naturally cooled even if the heating power is not input. The temperature can still be maintained at the required hot-start standby temperature (such as 210 degrees), so the input power P1 in the first working stage can be zero. When the adsorption roller in the VOC processing system reaches saturation, the adsorption rate of the roller will slowly decrease, even if the heater is cold-started from room temperature to the desorption temperature of about 300 to 400 degrees, which takes half an hour, The quality of the VOC components leaked during the process is not great, and it is acceptable for applications with less demanding environmental requirements. Even if some of the VOC components are leaked due to the saturation of the roller adsorption, after desorption in the second working stage, these gases containing a small amount of VOC components can be sent to the VOC processing system again for adsorption, so the standby temperature can also include The cold-start standby temperature is close to room temperature, and the input power Pl is zero. The standby temperature is set to the cold start standby temperature (20 degrees to 100 degrees). Due to the slow heating speed in the second working stage, although a small amount of VOC components leaked, the heating power in the first working stage is greatly reduced, and the energy saving effect is better. Moreover, the leaked part can be completely adsorbed in the subsequent adsorption process. Therefore, the short-term adsorption saturation does not cause serious impact, so the invention can also achieve the object of the invention, and belongs to the embodiments of the invention.

After the first stage is carried out long enough, it can be known from the detection or calculation data that the adsorption amount of the adsorption roller has reached or is about to reach saturation. When the absorption efficiency drops to a certain value, it is necessary to switch to the second working stage. The above detection can be achieved by two VOC concentration sensors 41, 43. For example, only the concentration sensor 41 is used to obtain the VOC concentration of the inflowing gas to be processed. The known flow rate of the inflowing gas is calculated by integrating the VOC concentration or Accumulation can be used to calculate the mass of the VOC component adsorbed on the adsorption roller after a certain period of time (ta) in the first stage of operation. If it is close to (70% to 90% of the saturated adsorption mass) the saturation adsorption amount of the adsorption roller, it can be controlled by The controller controls each valve and heater to start working and switch the working mode. The adsorption ratio (1-value of the concentration sensor 43 / value of the concentration sensor 41) can also be calculated by the concentration ratio of the two concentration sensors 41 and 43. When the adsorption ratio is lower than a preset value, for example, less than 95 % Indicates that some adsorption saturation occurs on the adsorption roller, and the adsorption rate begins to decrease to affect the adsorption effect, so it is also necessary to switch the working mode at this time. During the transition from the first working phase to the second working phase, the valve V4 needs to be opened, a high heating power Ph is input to the heater, and the state of the valve V3 is switched so that the high-temperature gas from the heater flows through the valve V3, and is closed and branched. The connection of the pipeline F41 turns on the driving fan 30 to allow the desorption gas to circulate, thereby realizing the desorption of the desorption region on the roller. In addition, the roller needs to be driven to rotate slowly, so that the desorption area can make the entire roller uniformly regenerate during the rotation process.

After entering the second working stage, the heater outputs high-temperature desorption gas. These high-temperature gases cause the VOC components accumulated on the desorption region 22 of the entire adsorption roller to be desorbed. At the same time, the adsorption region 20 is still continuing to adsorb and wait for the flow through. Process the VOC components in the gas, so the second working stage is close to the working mode of the VOC processing system in the conventional technology, and adsorption and desorption are performed on the roller at the same time. The execution time of the second working phase is very short. It only needs to rotate the suction roller for at least one week, or 2 to 3 weeks, so that the desorption can be achieved on the entire roller, and then the first working phase can be switched again. In the second working stage, the rotation speed of the adsorption roller can be as long as it can ensure complete desorption, but too slow rotation speed will also cause the high power input time period in the heater to be too long, and the energy saving effect will be weakened, so the optimal rotation speed is 3 revolutions / Hour to 8 rpm.

During the transition from the second working stage to the first working stage, since the desorption region 22 in the second working stage will be heated to a high temperature (greater than 180 degrees) by high-temperature gas, it cannot be directly adsorbed, so it needs to be in a short time. The cooling gas flows through the area that has just completed desorption, so the three-way valve V3 needs to be controlled so that the cooling gas flows through the cooling gas inlet pipe F2a, the cooling gas outlet pipe F2b, the branch pipe F41, and the valve V3. The air duct F3a and the desorption air duct F3b are exhausted, and the valve V4 is closed at the same time, so that the two ends of the heater are closed again to form a closed space, and the power input to the heater is reduced or completely cut off so that the temperature in the heater gradually decreases. To standby temperature. In this way, as long as the adsorption roller rotates through a small angle, so that the high-temperature desorption region 22 is sufficiently cooled, the adsorption can be performed normally. At this time, the communication between the valve V3 and the branch pipe F41 can be closed, the driving fan 30 can be closed, and then enter again. The first working phase.

As shown in FIG. 3, each parameter change pattern of the present invention in the first work phase, the second work phase, and the conversion step from the second work phase to the first work phase is shown. The driving fan 30 is turned on at time ta to supply a high heating power Ph to the heater, and the communication valve V4 causes the desorption gas to flow through the heater to the desorption region of the adsorption roller, and the connection between the valve V3 and the branch pipe F41 is maintained disconnected. Stop the supply of heating power to the heater at time tb, disconnect valve V4, open valve V3, so that the desorption inlet pipe F3b and branch pipe F41 are connected, and the driving fan 30 is maintained, until valve t3 and the driving fan are closed at time tc 30. The rotation speed of the adsorption roller in the first working stage can be arbitrarily selected as long as it is greater than zero, and the rotation speed of the second working stage cannot be too fast. It is preferable to be able to completely desorb the VOC components accumulated on the adsorption roller.

The duration of the first working stage in the present invention is affected by the concentration of the gas to be processed and the adsorption amount of the adsorption roller, but because there are two VOC concentration sensors, the length of the first working stage can reach the maximum, that is, extremely The time for maintaining the standby temperature of the low power Pl reaches the maximum, which can usually reach several hours, or even more than 5 hours. The second working stage, that is, the length of time for heating and desorption with high heating power Ph, only needs about 10 minutes to 30 minutes to achieve complete desorption of the entire adsorption roller. The power Pl that maintains the standby temperature is affected by the thermal conductivity parameters of the heater casing. The heater is usually made of heat-insulating material on the outside, so there is little outward diffusion, and there is no large amount of gas flowing in to take away the heat. At standby temperature, the power Pl can be very low, and the power Pl can be lower than 1/4 or even 1/10 of the high heating power Ph. Therefore, the VOC processing system and operation mode of the present invention can obtain extremely significant energy-saving effects compared with the conventional technology.

Fig. 4 is a schematic diagram of another embodiment of the present invention. The basic structure is the same as that shown in Fig. 2 of the present invention. The main difference is that there is no branch pipe F41, and the valve V3 'connected to the desorption intake pipe F3b It does not need to be a three-way valve, a two-way valve can achieve the purpose of the invention. The VOC processing system of this structure does not have a conversion step in the work. During the working process shown in FIG. 3, the drive fan 30, the valve V3, the valve V4, and the heater power input are simultaneously turned off at time tb. At tb The adsorption roller desorption area 22, which is at a high temperature at all times, is not cooled by the cooling air flow during subsequent rotation through the cooling pipe, and the adsorption rate is extremely low for a short period of time when it reaches the adsorption area, but the gas to be processed is also Can take away a lot of heat, so this period of time is short, the amount of leaked VOC is small, the disadvantage of leaking a small amount of VOC components is negligible compared to the technical advantage of extremely large energy saving.

In addition, the valve V4 can be provided on the cooling gas outlet pipe F2b or the cooling gas inlet pipe F2a. As long as the supply of air to the heater can be stopped in the first working stage, the heat dissipation in the heater can be avoided, saving Standby heating power. The valve V3 can also be omitted. Only by controlling the valve V4 and the driving fan 30, the air flow in the heater can be controlled. When the first working stage is entered, the valve V4 and the driving fan 30 are closed. Heat and high-temperature gas are closed at one end by valve V4 and there is no driving force at the other end, which will only slowly diffuse and the heat dissipation is small, so only a small amount of power is needed to maintain a sufficient standby temperature in the heater during the first working stage of standby, Relatively familiar technologies still have great energy-saving effects.

The valve in the present invention may be a manually opened or closed valve, or a motor or pneumatic / hydraulic driven valve. It can also be a flap that can be turned up. When the air flow is large, the flap is pushed up by the air flow, and the air flows through the heater to the adsorption roller. When the driving fan 30 stops driving, the flap automatically falls due to gravity. The airflow pipe is blocked, so when the flap is used, there is no need to drive the valve, and only the driving force of the driving fan 30 can be controlled to automatically control the flow / shutdown or flow of the airflow in the heater.

In addition to the embodiments shown in FIG. 2 and FIG. 4, the present invention includes a cooling gas inlet pipe F2a and a cooling gas outlet pipe F2b, which can also be omitted. The heater directly extracts a small amount from the processing gas exhaust pipe F1. The desorption gas, or direct extraction from the process gas inlet pipe F0, does not need to flow through the cooling zone 24. At this time, the adsorption roller only retains the adsorption region 20 and the desorption region 22, and there is no longer a cooling region 24. Because the adsorption roller in the present invention only performs adsorption and does not perform heating and desorption for most of the time, the desorption operation is performed only within a short time in the second working stage, and the adsorption roller is not sufficiently cooled in a short time, resulting in The desorption area that has just completed heating and desorption is turned to the adsorption area corresponding to the processing gas pipeline. Due to the high temperature, effective adsorption cannot be performed, and eventually VOC components are leaked, but during the entire working cycle (first working phase + second working phase) The proportion of these leaks is very low in terms of the flow of air flowing through them, so it is acceptable and is also an effective embodiment of the present invention.

The cooling gas inlet pipe F2a of the present invention can also be connected to the processing gas exhaust pipe F1. In this way, the cooling gas inlet pipe F2a is located on the right side of the adsorption roller in Figs. 2 and 4 and from the processing gas exhaust pipe F1. The cooling gas flows through the cooling area 24 in the adsorption roller, and then reaches the cooling gas outlet pipe F2b located on the left side of the adsorption roller, and then passes through the desorption inlet pipe F3b and enters the heater also located on the left side of the adsorption roller. The desorption area on the left side finally flows into the desorption exhaust duct F3a from the right side of the adsorption roller. Therefore, the cooling gas pipe and the desorption gas pipe of the present invention can be optionally installed on either side of the adsorption roller, and are not limited to the structures shown in FIG. 2 and FIG. 4, as long as they can be effective in the first working stage. Turn off the air flow in the heater, and accurately determine the working state switching signal after a period of time in the first working phase, and turn on the heater in the second working phase, so that VOC components are adsorbed and desorbed simultaneously in different areas on the adsorption roller. In addition, the purpose of energy saving and consumption reduction of the present invention can be achieved. In addition, in the first working stage, the valve may not be completely closed, but the opening degree of the valve needs to be set very small. Only a small amount of air will flow through the valve and the heater. Very little power is input into the heater, making the heater A small amount of high-temperature gas is output in the medium. Therefore, the embodiment in which the valve opening is kept at a very small state can also save a lot of energy compared with the conventional technology. When the second working phase is entered, the valve opening is adjusted to the maximum, and at the same time, high power is input into the heater to heat the air flow to fully desorb the adsorption roller.

The present invention provides another embodiment. In the first working stage, both ends of the heater are cut off by valves, and the desorption air inlet pipe F3b is connected to the process gas air inlet pipe F0 through other pipes, so that the desorption air pipe is desorbed. The gas to be processed is input in F3b, and these gas to be processed flow into the desorption area of the adsorption roller. At this time, the desorption area can adsorb the flowing VOC component, so the actual function of the desorption area 22 at this time is to adsorb VOC. Similarly, the cooling gas inlet pipe F2a and the cooling gas outlet pipe F2b can also flow into the gas to be processed for a long period of time in the first working stage, so that the actual effect of the cooling zone 24 is also the adsorption of VOC gas. Because the inlet and outlet ducts at both ends of the heater can be cut off by valves during the first working stage of the invention, the three desorption regions 22, cooling region 24, and adsorption region 20 on the entire adsorption roller can be simultaneously used as The adsorption area, that is, the present invention has a larger adsorption area. Compared with the conventional technology, it can only adsorb in the adsorption area 20, and the present invention can process more gas per unit time. The air processed through the cooling region 24 and the desorption region 22 flows through the independent pipes to the processing gas exhaust pipe F1, and is finally discharged to a space requiring clean air.

In the above embodiment of the present invention, the valves V4, V3 upstream or downstream of the heater are used to close the air flow in the heater in the first working stage. The same valve can also be integrated directly inside the heater, as long as it can be Reducing or completely turning off the heater airflow during a working phase can achieve the goal of substantial energy savings of the present invention.

In order to reduce the air flow in the heater, the present invention may not be provided with a valve, and the air pressure downstream of the heater is controlled by controlling the rotation speed of the driving fan 30 in the desorption gas exhaust pipe, so that the heater affected by the processing fan 10 The pressure in the upstream air intake duct is close to the air pressure in the desorption air intake duct F3b downstream of the heater, so that the airflow flowing through the heater is small, and the heat dissipation rate in the heater is slowed down. In the second working stage, the driving fan 30 has a relatively large rotational speed, so that the pressure in the desorption exhaust pipe F3a and the desorption inlet pipe F3b is lower than that in the intake pipe upstream of the heater. The air flow is discharged through the heater, the adsorption roller, and the desorption gas exhaust pipe. In the first working stage, the rotational speed of the driving fan 30 is small, and the low pressure it generates is close to the pressure in the intake duct upstream of the heater, so only a small flow of gas will flow through the heater, so without a valve The heat dissipation in the heater can also be small, and the purpose of energy saving of the present invention can also be achieved.

The controller in the present invention can monitor the adsorption state of the adsorption roller according to a VOC concentration sensor provided in the VOC processing system. Once it is found that the adsorption rate of the VOC gas has decreased, it indicates that the adsorption roller has started to saturate, and the VOC processing system is to start One working phase is switched to the second working phase. During the conversion between the two working phases, the controller needs to output a first control signal to control the heating power in the heater from the standby power in the first working phase to the desorption power in the second working phase to increase the power in the second working phase. The desorption of the adsorption roller is completed in the working phase. The controller also outputs a second control signal to control the airflow in the heater. The airflow in the first working phase can be small or almost no airflow. In the second working phase, there must be sufficient airflow to complete the adsorption of the adsorption roller. Desorption. The second control signal can control the valve located in the pipeline upstream or downstream of the heater, or the integrated valve of the heater itself, so that the air flow through the heater changes greatly. The second control signal can also control the rotation speed of a driving fan located in the upstream or downstream pipeline of the heater. By controlling the driving fan, the flap valve in the upstream or downstream pipeline of the heater is automatically opened or closed, or the heater is upstream and downstream. The air pressure is close, and this way of controlling the driving fan can also indirectly control the air flow in the heater.

Although the content of the present invention has been described in detail through the above-mentioned preferred embodiments, it should be recognized that the above description should not be considered as limiting the present invention. Various modifications and alternatives to the present invention will be apparent to those skilled in the art after reading the foregoing. Therefore, the protection scope of the present invention should be defined by the scope of the attached patent application.

10‧‧‧ Handling Fan

30‧‧‧driven fan

20‧‧‧ Adsorption area

22‧‧‧ Desorption area

24‧‧‧ Cooling area

41, 43‧‧‧ concentration sensor

F0‧‧‧Processing gas inlet pipe

F1‧‧‧Processing gas exhaust pipe

F2a‧‧‧Cooling gas inlet duct

F2b‧‧‧Cooling gas outlet pipe

F3a‧‧‧ Desorption exhaust pipe

F3b‧‧‧ Desorption Intake Duct

F41, F42‧‧‧ branch pipeline

Ph‧‧‧High heating power

Pl‧‧‧ Power

ta, tb, tc‧‧‧time

V3, V3 ’, V4‧‧‧ valves

Other features, objects, and advantages of the present invention will become more apparent by reading the detailed description of the non-limiting embodiments with reference to the following drawings:

FIG. 1a is a schematic structural diagram of a conventional technology VOC processing system.

Figure 1b is a schematic diagram of the area division in the side view of the adsorption roller in the conventional technology.

FIG. 2 shows a schematic structural diagram of a VOC processing system according to the first embodiment of the present invention.

FIG. 3 is a schematic diagram of changes in flow rate, heating power, and temperature in a heater in each pipeline in the first embodiment of the present invention.

FIG. 4 is a schematic structural diagram of a VOC processing system according to a second embodiment of the present invention.

Claims (22)

A volatile organic compound (VOC) processing system includes: an adsorption roller, which is rotatable and includes an adsorption area, a desorption area, and a cooling area; a processing fan, which is a processing gas containing a VOC component through a processing gas inlet pipe It is delivered to the first end of the adsorption area, and the process gas exhaust pipe is connected to the second end of the adsorption area, and the purified process gas is output; the heater includes an airflow input end connected to the intake pipe, and the heater It further includes an airflow output end, which is connected to one end of the desorption area by a desorption gas inlet pipe, and a desorption gas exhaust pipe is connected to the other end of the desorption area, for discharging a desorption gas having a high concentration of VOCs. The first VOC concentration sensor is provided in the processing gas intake pipe or the processing gas exhaust pipe; and the controller receives the concentration signal from the first VOC concentration sensor and controls the concentration signal according to the concentration signal The heater has different heating power in the first working phase and the second working phase, wherein the second heating power input in the second working phase can make the The airflow output from the heater flows into the desorption area and desorbs the VOC component on the adsorption roller. The first heating power input in the first working stage is lower than the second heating power, so that the temperature in the heater is maintained. At standby temperature. The VOC processing system according to item 1 of the scope of patent application, wherein at least a first of the intake duct upstream of the heater, the desorbed gas intake duct downstream of the heater, and the desorbed gas exhaust duct is provided. A valve, the controller controls the first valve to have a first opening degree during the second working phase, so that the gas flowing through the first valve has a first flow rate and has a second opening degree during the first working phase, So that the desorption gas stops flowing or the flow rate is smaller than the first flow rate. The VOC processing system according to item 2 of the scope of patent application, wherein the intake duct upstream of the heater includes a cooling gas intake duct connected to one end of the cooling area of the adsorption roller, and the cooling gas exhaust duct is connected to the Between the other end of the cooling area of the adsorption roller and the airflow input end of the heater. The VOC processing system according to item 3 of the scope of patent application, wherein the first valve is disposed on the cooling gas inlet pipe or the cooling gas exhaust pipe, and the controller controls the first valve in the first working stage Shut off so that the heater has no airflow during the first working phase. The VOC processing system according to item 4 of the patent application scope, further comprising a second valve located on the desorption gas inlet pipe, and the first valve located on the cooling gas inlet pipe or the cooling gas exhaust pipe In the first working phase, the first valve and the second valve that are closed make a closed space inside the heater. The VOC processing system according to item 5 of the scope of patent application, wherein the cooling gas exhaust pipe further includes a branch pipe connected to the second valve, and the second valve is a three-way valve. The VOC treatment system according to item 1 of the scope of patent application, wherein the desorption gas exhaust pipe is further provided with a driving fan for discharging the desorption gas, and the driving fan is controlled to have a first rotation speed in the first working stage Having a second speed in the second working phase, wherein the first speed is lower than the second speed, so that in the first working phase, the desorption gas inlet pipe downstream of the heater and the upstream of the heater The intake duct has a close air pressure. The VOC processing system according to item 7 of the scope of patent application, wherein at least a first valve is provided in the intake pipe upstream of the heater or the desorption gas intake pipe and the desorption gas exhaust pipe downstream, The first valve is a flap. In the second working phase, the flap is pushed up by the air flow driven by the driving fan. In the first working phase, the driving fan closes the flap and closes the air flow duct. The VOC processing system according to item 1 of the scope of patent application, further comprising a second VOC concentration sensor, one of the first VOC concentration sensor and the second VOC concentration sensor is disposed in the processing gas inlet pipe, Another is disposed in the processing gas exhaust pipe, and the controller receives concentration information from the first VOC concentration sensor and the second VOC concentration sensor, and according to the first VOC concentration sensor and the second VOC concentration The concentration information of the sensor determines the execution time length of the first working phase. A method for operating a VOC processing system. The processing system includes: an adsorption roller, a heater, a driving fan, a controller, and a plurality of gas pipes connected to different regions of the adsorption roller. The gas pipe includes at least one valve. The operating method of the VOC processing system includes: a first working phase and a second working phase of an alternating cycle; in the first working phase, the gas to be processed is passed into the adsorption area of the adsorption roller, and the valve is controlled to make the heater No air current flows through or flows at a first flow rate, and the power input to the heater is the first power, so that the internal temperature of the heater is lower than the desorption temperature and higher than the standby temperature; The processing gas continues to flow into the adsorption area of the adsorption roller, and the valve is controlled so that a gas flow having a second flow rate flows into the heater and into the desorption area on the adsorption roller, and the power input to the heater is the second power, The airflow output by the heater can desorb the VOC components adsorbed in the desorption area, wherein the second power is greater than the first power. Rate, the time length of the first work phase is greater than the time length of the second work phase, and the first flow rate is less than the second flow rate. The operating method according to item 10 of the patent application scope, wherein the VOC processing system further includes a VOC concentration sensor, and switches from the first working phase to the second working phase according to an output concentration signal of the VOC concentration sensor. The operating method according to item 11 of the scope of the patent application, wherein the VOC concentration sensor measures the VOC concentration value of the inflow gas in the adsorption area on the adsorption roller and the VOC concentration value of the outflow gas in the adsorption area. When the ratio between the concentration value and the VOC concentration value of the inflow gas is greater than a preset value, the process is switched to the second working phase. According to the operating method described in item 11 of the scope of patent application, the conversion process from the second working phase to the first working phase further includes a conversion step, which closes the valve or reduces the valve opening so that the heater There is no air flow or the flow is less than or equal to the second flow. The power input to the heater is less than or equal to the first power. At the same time, the air flows through the cooling area on the adsorption roller, so that the adsorption roller is cooled to a temperature capable of adsorbing VOC components. . The operating method as described in item 11 of the scope of patent application, wherein the time length of the first working phase is greater than twice the time length of the second working phase. The operating method according to item 11 of the scope of patent application, wherein the second power is 4 times greater than the first power. The operating method according to item 11 of the scope of patent application, wherein in the first working phase, the driving fan is controlled to stop running, or is lower than the operating speed in the first working phase, so that the heater is in the upstream or downstream pipeline. The valve closes automatically, and the valve is flap-shaped. According to the operating method described in item 11 of the scope of patent application, in the first working stage, the valve is closed so that no air flows through the heater, and at the same time, the gas to be processed continues to flow into the desorption of the adsorption roller Zone or cooling zone. A method for operating a VOC processing system. The VOC processing system includes: an adsorption roller, a heater, a process gas-driven fan, a desorption gas-driven fan, a controller, and a plurality of gas pipes connected to different regions of the adsorption roller. The VOC The operating method of the processing system includes: a first working phase and a second working phase of an alternating cycle; in the first working phase, the processing gas drives a fan to drive the gas to be processed, so that the gas to be processed passes into the adsorption of the adsorption roller Area, controlling the desorption gas-driven fan to have a first rotation speed, the first rotation speed causes the airflow in the heater to have a first flow rate, and the power input to the heater is the first power, so that the internal temperature of the heater is lower than the desorption The temperature is higher than the standby temperature; and in the second working phase, the gas to be processed is continuously passed into the adsorption area of the adsorption roller, and the desorption gas-driven fan is controlled to have a second rotation speed, which is caused to have a second rotation speed The flow of air flows into the heater and into the desorption area on the adsorption roller. The power input to the heater is Two power, the airflow output by the heater has a desorption temperature, which can desorb the VOC components adsorbed in the desorption area, wherein the second power is greater than the first power, and the length of the first working phase is longer than the first For the length of the two working phases, the first flow rate is less than the second flow rate, and the first speed is less than the second speed. A controller for a VOC processing system. The VOC processing system includes an adsorption roller, a heater, a driving fan, a VOC concentration sensing device, and a plurality of gas pipes connected to different regions of the adsorption roller. The controller includes at least A signal input terminal for receiving a VOC concentration signal from the VOC concentration sensing device in the VOC processing system, and the controller controls the VOC processing system to work between the first working phase and the second working phase according to the VOC concentration signal. The controller further includes a first control signal output terminal and a second control signal output terminal in an alternating cycle: the first control signal output terminal is used to output a heater power signal, and the heater is based on the heater power signal at the first A first heating power and a second heating power are respectively output in the working phase and the second working phase; and the second control signal output terminal is used to output a heater flow signal, and the heater flow signal is used to control a heater in the heater. Air flow, so that the air flow through the heater has a first flow in the first working phase and the second working phase, respectively And a second flow rate, wherein the first heating power is less than the second heating power and the first flow rate is less than the second flow rate. The controller as described in claim 19, wherein the heater flow control signal is output to a valve in the VOC processing system, so that the valve opening degree is changed, and the valve is located in a pipeline upstream or downstream of the heater or the Heater. The controller according to item 19 of the scope of patent application, wherein the adsorption roller includes an adsorption region and a desorption region, a desorption pipe is connected to the desorption region of the adsorption roller, and a heater flow control signal is output to the desorption pipe In the driving fan, the driving fan has a first speed and a second speed in the first working phase and the second working phase, wherein the first speed is less than the second speed. The controller as described in claim 19, wherein the VOC processing system includes a processing gas inlet pipe and a processing gas exhaust pipe, and the VOC concentration sensing device includes a processing gas inlet pipe and the processing gas exhaust pipe. The first VOC concentration sensor and the second VOC concentration sensor in the pipeline, the controller judges the saturation degree of the adsorption roller according to the VOC concentration signal input by the first VOC concentration sensor and the second VOC concentration sensor, and determines The VOC processing system switches the time from the first working phase to the second working phase.