Efficient energy-saving purification system for intermittent fluctuating type soluble granulation tail gas

Abstract

The utility model provides a high-efficiency energy-saving purification system for intermittent fluctuating type soluble granulation tail gas, which comprises a waste gas treatment system, a waste gas purification system, a waste gas purification system and a waste gas purification system, the waste gas treatment system comprises a first-stage spray tower, a second-stage spray tower, a third-stage spray tower, a fourth-stage spray tower and a fifth-stage spray tower, and water tanks of the first-stage spray tower, the second-stage spray tower, the third-stage spray tower, the fourth-stage spray tower and the fifth-stage spray tower are sequentially connected in series; the circulating liquid replacement system comprises a VOCs concentration detector, a water replenishing valve, a drain valve and a waste gas inlet pipeline, the water replenishing valve is arranged on the water tank of the five-stage spray tower, the drain valve is arranged on the water tank of the first-stage spray tower, and the waste gas inlet pipeline is connected with the VOCs concentration detector; when the VOCs concentration detector detects that the inlet gas concentration exceeds a set value, the control device controls the drain valve and the water replenishing valve to be opened; and when the VOCs concentration detector detects that the concentration is lower than a set value, the control device controls to close the drain valve and the water replenishing valve. The system disclosed by the utility model has the advantages of high efficiency, energy conservation, simplicity in installation, good treatment effect, strong pertinence and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of pharmaceutical and chemical organic waste gas treatment, and in particular to a high-efficiency energy-saving purification system for intermittent undulating soluble granulation tail gas. Background Art

[0002] Granulation is a technology that processes materials in the state of powder, melt, aqueous solution, etc. into granules with a certain shape and size. Among them, wet granulation is the most widely used in pharmaceutical production. Wet granulation is a method of wetting the surface of drug powder particles with liquid to produce adhesion between powder particles, and then forming particles of a certain shape and size under the action of liquid bridging and external mechanical force. After drying, it is finally solidified in the form of a solid bridge. In wet granulation, solvents with good water solubility are the most widely used. However, when using such solvents, the drying section presents intermittent emissions, large concentration fluctuations, and extremely high peak-to-valley differences, which brings great difficulty to the selection of subsequent waste gas treatment processes. If incineration or adsorption-desorption and other treatment processes are used, the equipment investment is high and the operating energy consumption is high.

[0003] If the traditional process of multi-stage spray tower absorption is adopted, there are two disadvantages. On the one hand, it is impossible to monitor the fluctuation of the exhaust gas inlet concentration, resulting in saturation of the spray tower circulating liquid and excessive exhaust gas outlet. On the other hand, the spray tower has a large discharge volume, resulting in serious waste of tap water and increased water treatment costs.

[0004] After searching, the Chinese utility model patent with the authorization announcement number CN216703788U discloses a water-saving environmentally friendly waste gas tower, including a first spray tower, a second spray tower and a third spray tower. The exhaust gas from the production line is introduced into the air inlet of the first spray tower, and then passes through the second spray tower and the third spray tower to complete three spray purifications. The first spray tower is provided with a first spray pipeline, an external discharge pipeline is led out from the first spray pipeline, and a first electromagnetic overflow valve is provided on the external discharge pipeline. The second spray tower is provided with a second Spray pipeline, the second spray tower is provided with a raw water pipeline, the raw water pipeline is provided with a flow regulating valve, the bottom of the second spray tower leads to a purification pipeline connected to the RO equipment, the purification pipeline is provided with a second electromagnetic overflow valve, the concentrated water outlet of the RO equipment is connected to the first spray tower, the pure water outlet of the RO equipment is connected to the third spray tower, the third spray tower is provided with a third spray pipeline, the third spray pipeline leads to a return liquid pipeline connected to the first spray tower, and the return liquid pipeline is provided with a third electromagnetic overflow valve. However, the equipment has a complex structure, is inconvenient to install, and the exhaust gas treatment effect needs to be further improved.

[0005] Therefore, it is necessary to improve the existing waste gas treatment system using multi-stage spray tower absorption to solve the above problems. Utility Model Content

[0006] In view of the defects in the prior art, the purpose of the utility model is to provide a high-efficiency and energy-saving purification system for intermittent undulating soluble granulation tail gas.

[0007] The utility model is realized by the following technical solutions:

[0008] According to one aspect of the utility model, there is provided a high-efficiency and energy-saving purification system for intermittent undulating soluble granulation tail gas, the system comprising:

[0009] The exhaust gas treatment system comprises a first-stage spray tower, a second-stage spray tower, a third-stage spray tower, a fourth-stage spray tower and a fifth-stage spray tower which are arranged in sequence, wherein the bottom heights of the first-stage spray tower to the fifth-stage spray tower are raised in sequence, and the water tanks of the first-stage spray tower to the fifth-stage spray tower are connected in series in sequence;

[0010] A circulating liquid replacement system, comprising a VOCs concentration detector, a water supply valve, a drain valve, and an exhaust gas inlet pipe, wherein the water supply valve is arranged on the water tank of the five-stage spray tower, the drain valve is arranged on the water tank of the first-stage spray tower, the VOCs concentration detector is arranged in front of the first-stage spray tower, and the exhaust gas inlet pipe is connected to the VOCs concentration detector;

[0011] The control device is respectively connected to the VOCs concentration detector, the water supply valve and the drain valve. When the VOCs concentration detector detects that the intake air concentration exceeds a set value, the control device controls the drain valve and the water supply valve to be opened; when the VOCs concentration detector detects that the concentration is lower than a set value, the control device controls the drain valve and the water supply valve to be closed.

[0012] Optionally, the bottom heights of the first-stage spray tower to the fifth-stage spray tower are raised by 20 cm step by step.

[0013] Optionally, the water tank of the first-stage spray tower and the water tank of the fifth-stage spray tower are connected in series through an overflow pipe.

[0014] Optionally, the water tank of the first-stage spray tower is connected to one end of the drainage pneumatic valve, the other end of the drainage pneumatic valve is connected to the drainage pipe, and the water tank of the five-stage spray tower is connected to one end of the water replenishment pneumatic valve, the other end of the water replenishment pneumatic valve is connected to the water replenishment pipe.

[0015] Optionally, the VOCs concentration detector includes an alarm device, which sends out an alarm when the intake air concentration exceeds a set value.

[0016] Optionally, the exhaust gas treatment system further includes a defogger tower, the air inlet of the defogger tower is connected to the air outlet of the five-stage spray tower, and the defogger tower is used to remove water vapor in the exhaust gas after being treated by the spray tower.

[0017] Optionally, the exhaust gas treatment system further comprises an activated carbon adsorber, and an air inlet of the activated carbon adsorber is connected to an air outlet of the demister tower.

[0018] Optionally, the system further comprises a waste gas emission system, and the waste gas emission system is connected to the activated carbon adsorber.

[0019] Optionally, the exhaust gas emission system includes a centrifugal fan and an exhaust pipe, the centrifugal fan is connected to the air outlet of the activated carbon adsorber, and the centrifugal fan discharges the treated exhaust gas into the exhaust pipe.

[0020] Compared with the prior art, the utility model has at least one of the following beneficial effects:

[0021] 1. The utility model adopts multi-stage spray tower absorption. The tap water inlet is from the fifth-stage spray tower as the import, and the circulating liquid overflows to the first-stage spray tower in turn. According to the concentration of the front-end exhaust gas source, if the exhaust gas is higher than the VOCs online concentration setting value, the sewage replacement of the circulating water is enhanced to ensure that the circulating liquid of the 5-stage spray tower is in a relatively clean state, and prevent the high-concentration exhaust gas from being desorbed from the circulating liquid, resulting in the exhaust gas outlet concentration exceeding the standard, thereby effectively removing the exhaust gas and saving the energy consumption of tap water.

[0022] 2. The high-efficiency and energy-saving purification system of the utility model, after VOCs are collected and transported to the treatment equipment, can ensure automatic interlocking control in high-concentration or low-concentration VOCs waste gas conditions through the mutual cooperation of VOCs concentration detectors, control devices, etc. The system has a simple structure, convenient control, easy operation, and stable operation. The system provided by the embodiment of the utility model can efficiently treat the water-soluble VOCs waste gas generated by the granulation process, and has the advantages of high treatment efficiency, low operating energy consumption, low operating costs, and simple operation and management. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0024] Figure 1 It is a structural schematic diagram of a high-efficiency energy-saving purification system in one embodiment of the utility model.

[0025] The corresponding numbers in the figure are: 1-first-stage spray tower, 2-second-stage spray tower, 3-third-stage spray tower, 4-fourth-stage spray tower, 5-fifth-stage spray tower, 6-defog tower, 7-activated carbon adsorber, 8-centrifugal fan, 9-exhaust pipe, 10-water supply valve, 11-drain valve, 12-VOCs concentration detector, 13-waste gas inlet pipe, 14-water supply pipe, 15-drainage pipe. DETAILED DESCRIPTION

[0026] The utility model is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the utility model, but do not limit the utility model in any form. It should be pointed out that for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the utility model. These all fall within the scope of protection of the utility model.

[0027] Reference Figure 1 As shown, an embodiment of the utility model provides an efficient and energy-saving purification system for intermittent undulating soluble granulation tail gas to solve the problem of large VOCs emission in wet granulation waste gas, and the system includes a waste gas treatment system, a circulating liquid replacement system and a control device. Taking into account the waste gas treatment effect and cost, the waste gas treatment system includes a first-stage spray tower 1, a second-stage spray tower 2, a third-stage spray tower 3, a fourth-stage spray tower 4 and a fifth-stage spray tower 5 arranged in sequence to achieve the effect of reducing the concentration of waste gas. The bottom heights of the first-stage spray tower 1 to the fifth-stage spray tower 5 are raised in sequence, and the water tanks of the first-stage spray tower 1 to the fifth-stage spray tower 5 are connected in series in sequence to realize the overflow of the circulating liquid; the circulating liquid replacement system includes a VOCs concentration detector 12, a water supply valve 10, a drain valve 11, and an exhaust gas inlet pipe 13. The water supply valve 10 is arranged on the water tank of the fifth-stage spray tower 5, and the drain valve 11 is arranged on the water tank of the first-stage spray tower 1. The tap water enters from the water tank of the fifth-stage spray tower 5, and the circulating liquid overflows to the first-stage spray tower 1 in sequence. The VOCs concentration detector 12 is arranged on the first-stage spray tower 1, the exhaust gas inlet pipe 13 is connected to the VOCs concentration detector 12; the control device is respectively connected to the VOCs concentration detector 12, the water supply valve 10 and the drain valve 11. When the VOCs concentration detector 12 detects that the intake concentration exceeds the set value, the control device controls to open the drain valve 11 and the water supply valve 10; when the VOCs concentration detector 12 detects that the concentration is lower than the set value, the control device controls to close the drain valve 11 and the water supply valve 10. The specific implementation method of the control device controlling the drain valve 11 and the water supply valve 10 is realized by the existing technology. The embodiment of the utility model adopts multi-stage spray tower absorption, the tap water enters from the five-stage spray tower 5, and the circulating liquid overflows to the first-stage spray tower 1 in turn. The circulation of the circulating liquid is controlled according to the intake concentration, and the circulating liquid of the five-stage spray tower is maintained in a relatively clean state. It is suitable for the treatment of soluble granulation tail gas with intermittent discharge and concentration fluctuation. While ensuring the waste gas treatment efficiency, it can also save water energy consumption. The system structure is simple and the operation is stable.

[0028] In the embodiment of the utility model, the VOCs waste gas to be treated is a waste gas that is miscible with water. When the VOCs concentration detector 12 detects that the intake concentration exceeds the set value, the drain valve 11 on the water tank of the first-stage spray tower 1 is opened, and the water replenishment valve 10 on the water tank of the five-stage spray tower 5 is opened. The circulating liquid in the water tank flows from the five-stage spray tower 5 to the first-stage spray tower 1 in turn, and is finally discharged from the discharge port of the first-stage spray tower 1. The water in the spray tower water tank is in a continuous flow state. Through the effect of the five-stage spray tower circulating spray, the waste gas with good water solubility is absorbed, the waste gas concentration can be reduced, and the effect of removing VOCs can be achieved. Since the five-stage spray is set, and the circulating liquid overflows to the first-stage spray tower 1 in turn, the concentration of the water-soluble VOCs waste gas can be effectively reduced, so that the water-soluble VOCs waste gas generated by the granulation process can be efficiently treated, and the operating energy consumption is low.

[0029] In some embodiments, the bottom heights of the first-stage spray tower 1 to the fifth-stage spray tower 5 are raised by 20 cm step by step. Considering the pressure drop in the spray tower, the negative pressure in the first-stage spray tower 1 to the fifth-stage spray tower 5 is increased step by step, and the height difference between each stage of the tower is controlled at about 20 cm.

[0030] In some embodiments, the water tank of the first-stage spray tower 1 and the water tank of the fifth-stage spray tower 5 are connected in series through an overflow pipe, and the circulating liquid flows from the fifth-stage spray tower 5 to the first-stage spray tower 1. In this way, the circulating liquid of the five-stage spray tower can be ensured to be relatively clean, and high-concentration exhaust gas is prevented from being desorbed from the circulating liquid, resulting in the exhaust gas outlet concentration exceeding the standard, thereby effectively removing the exhaust gas and saving the energy consumption of tap water.

[0031] To achieve automatic control of the system, for example, the water supply valve 10 adopts a water supply pneumatic valve, the drain valve 11 adopts a drain pneumatic valve, the water tank of the first-stage spray tower 1 is connected to one end of the drain pneumatic valve, and the other end of the drain pneumatic valve is connected to the drain pipe 15, the water tank of the five-stage spray tower 5 is connected to one end of the water supply pneumatic valve, and the other end of the water supply pneumatic valve is connected to the water supply pipe 14, the tap water enters the five-stage spray tower 5 from the water supply pipe 14, and the circulating liquid flows from the discharge port of the first-stage spray tower 1 through the drain pipe 15 to the wastewater collection tank.

[0032] In the above embodiment, the spray tower absorbs the waste gas with good water solubility through the effect of circulating spraying, reduces the concentration of the waste gas, and achieves the effect of removing VOCs. A VOCs concentration detector 12 is provided in front of the first-level spray tower 1 to monitor the VOCs concentration of the waste gas, thereby achieving the measure of automatically replacing the waste water discharged from the spray tower. When the VOCs concentration is greater than the set value, the system starts to replace the circulating liquid of the spray tower, controls the concentration of the VOCs outlet, and prevents the water-soluble waste gas from being desorbed from the circulating liquid. In some embodiments, the VOCs concentration detector 12 includes an alarm device, which sounds an alarm when the intake concentration exceeds the set value, and the intake concentration setting value for the alarm is adjusted according to factors such as the type of exhaust gas.

[0033] To further improve the effect of exhaust gas treatment, in some embodiments, the exhaust gas treatment system also includes a defogger 6, the air inlet of the defogger 6 is connected to the air outlet of the five-stage spray tower 5, and the defogger 6 is used to remove water vapor carried in the exhaust gas after treatment by the spray tower.

[0034] In some embodiments, the exhaust gas treatment system also includes an activated carbon adsorber 7, the air inlet of the activated carbon adsorber 7 is connected to the air outlet of the defogger 6. Exemplarily, the activated carbon adsorber 7 is in the shape of a box, and activated carbon particles are arranged in the box to absorb the residual exhaust gas after spraying, thereby ensuring that the exhaust gas outlet can stably meet the emission standards.

[0035] In the above embodiment, since the activated carbon adsorber 7 is arranged at the rear end of the multi-stage spray tower, the water vapor carried in the exhaust gas is removed by the demister 6, which helps to improve the adsorption effect of the rear activated carbon adsorber 7. Specifically, the exhaust gas dehumidified by the demister 6 enters the activated carbon adsorber 7, which can effectively reduce the processing load of the activated carbon adsorber 7, thereby ensuring that the organic matter at the outlet is fully removed.

[0036] In addition, the activated carbon adsorber 7 is arranged at the rear end of the multi-stage spray tower. When a spray tower of a certain stage fails temporarily, or when the instantaneous concentration of the exhaust gas is high, the activated carbon adsorber 7 is arranged as the terminal adsorption treatment, which can be used as a safeguard measure to effectively ensure that the exhaust gas is stably discharged in compliance with the standards.

[0037] In some embodiments, the system further includes a waste gas emission system, which is connected to the activated carbon adsorber 7 .

[0038] Exemplarily, the exhaust gas emission system includes a centrifugal fan 8 and an exhaust pipe 9 . The centrifugal fan 8 is connected to the air outlet of the activated carbon adsorber 7 , and the centrifugal fan 8 discharges the treated exhaust gas into the exhaust pipe 9 .

[0039] The high-efficiency energy-saving purification system provided in the above embodiment has a process flow for treating water-soluble waste gas as follows:

[0040] The exhaust gas enters the first-level spray tower 1 for spray absorption through the conveying pipeline, then enters the second-level spray tower 2 for spray absorption, then enters the third-level spray tower 3 for spray absorption, then enters the fourth-level spray tower 4 for spray absorption, and finally enters the fifth-level spray tower 5 for absorption and then enters the demisting tower 6 for dehumidification. After most of the water vapor in the exhaust gas is intercepted, it enters the activated carbon adsorber 7 for adsorption. The exhaust gas contacts with the activated carbon particles and is adsorbed by the activated carbon particles. The exhaust gas is discharged into the exhaust pipe 9 through the gravity of the centrifugal fan 8 (induced draft fan) to meet the emission standards.

[0041] When the system detects that the VOCs concentration in the exhaust gas exceeds the set value, the drain valve 11 on the water tank of the first-stage spray tower 1 is opened, and the water replenishment valve 10 on the water tank of the fifth-stage spray tower 5 is opened. The circulating liquid in the water tank flows from the fifth-stage spray tower 5 to the first-stage spray tower 1 in turn, and is finally discharged from the drain port of the first-stage spray tower 1. The circulating liquid in the spray tower water tank is in a continuous flow state. When the VOCs concentration detector 12 detects that the concentration is lower than the set value, the drain valve 11 on the water tank of the first-stage spray tower 1 is closed, and the water replenishment valve 10 on the water tank of the fifth-stage spray tower 5 is closed, thereby improving the stability of organic waste gas treatment and having better impact resistance to waste gas with large concentration fluctuations.

[0042] The embodiment of the utility model adopts multi-stage spray tower absorption, the tap water inlet is from the fifth-stage spray tower 5 as the import, the circulating liquid overflows to the first-stage spray tower 1 in sequence, according to the strength and concentration of the front-end exhaust gas source, if the exhaust gas is higher than the VOCs online concentration setting value, the sewage replacement measures of the circulating water are strengthened to ensure that the circulating liquid of the five-stage spray tower is in a relatively clean state, to prevent the high-concentration exhaust gas from being desorbed from the circulating liquid and causing the exhaust gas outlet concentration to exceed the standard, thereby being able to effectively remove the exhaust gas and save the energy consumption of tap water. The system is suitable for the treatment of soluble granulation tail gas with intermittent emissions and concentration fluctuations.

[0043] The high-efficiency and energy-saving purification system provided by the embodiment of the utility model, after VOCs are collected and transported to the processing equipment, the VOCs concentration detector, the control device, etc. cooperate with each other to ensure that automatic interlocking control can be achieved in the case of high or low concentration of VOCs waste gas, and the system structure is simple, the control is convenient, the operation is easy, and the operation is stable. The system can efficiently process the water-soluble VOCs waste gas generated by the granulation process, with high processing efficiency, low operating costs, and simple operation and management. It has the advantages of high efficiency, energy saving, low operating costs, simple installation, good processing effect, and strong pertinence.

[0044] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various modifications or variations within the scope of the claims, which does not affect the essence of the present invention.

Claims

1. A high-efficiency and energy-saving purification system for intermittent undulating soluble granulation tail gas, characterized in that: include: The exhaust gas treatment system comprises a first-stage spray tower, a second-stage spray tower, a third-stage spray tower, a fourth-stage spray tower and a fifth-stage spray tower which are arranged in sequence, wherein the bottom heights of the first-stage spray tower to the fifth-stage spray tower are raised in sequence, and the water tanks of the first-stage spray tower to the fifth-stage spray tower are connected in series in sequence; A circulating liquid replacement system, comprising a VOCs concentration detector, a water supply valve, a drain valve, and an exhaust gas inlet pipe, wherein the water supply valve is arranged on the water tank of the five-stage spray tower, the drain valve is arranged on the water tank of the first-stage spray tower, the VOCs concentration detector is arranged in front of the first-stage spray tower, and the exhaust gas inlet pipe is connected to the VOCs concentration detector; The control device is respectively connected to the VOCs concentration detector, the water supply valve and the drain valve. When the VOCs concentration detector detects that the intake air concentration exceeds a set value, the control device controls the drain valve and the water supply valve to be opened; when the VOCs concentration detector detects that the concentration is lower than a set value, the control device controls the drain valve and the water supply valve to be closed.

2. The high-efficiency and energy-saving purification system for intermittent undulating soluble granulation tail gas according to claim 1 is characterized in that: The bottom heights of the first-stage spray tower to the fifth-stage spray tower are raised by 20 cm step by step.

3. The high-efficiency and energy-saving purification system for intermittent undulating soluble granulation tail gas according to claim 1 is characterized in that: The water tank of the first-stage spray tower and the water tank of the fifth-stage spray tower are connected in series through an overflow pipe.

4. The high-efficiency and energy-saving purification system for intermittent undulating soluble granulation tail gas according to claim 1 is characterized in that: The water tank of the first-stage spray tower is connected to one end of the drainage pneumatic valve, and the other end of the drainage pneumatic valve is connected to the drainage pipe. The water tank of the five-stage spray tower is connected to one end of the water replenishment pneumatic valve, and the other end of the water replenishment pneumatic valve is connected to the water replenishment pipe.

5. The high-efficiency and energy-saving purification system for intermittent undulating soluble granulation tail gas according to claim 1, characterized in that: The VOCs concentration detector includes an alarm device, which sends out an alarm when the intake air concentration exceeds a set value.

6. The high-efficiency and energy-saving purification system for intermittent undulating soluble granulation tail gas according to claim 1, characterized in that: The waste gas treatment system also includes a defogger tower, the air inlet of the defogger tower is connected to the air outlet of the five-stage spray tower, and the defogger tower is used to remove water vapor in the waste gas after being treated by the spray tower.

7. The high-efficiency and energy-saving purification system for intermittent undulating soluble granulation tail gas according to claim 6, characterized in that: The exhaust gas treatment system further comprises an activated carbon adsorber, and an air inlet of the activated carbon adsorber is connected to an air outlet of the demister tower.

8. The high-efficiency and energy-saving purification system for intermittent undulating soluble granulation tail gas according to claim 7, characterized in that: The system further comprises an exhaust gas emission system, which is connected to the activated carbon adsorber.

9. The high-efficiency and energy-saving purification system for intermittent undulating soluble granulation tail gas according to claim 8, characterized in that: The waste gas emission system comprises a centrifugal fan and an exhaust pipe. The centrifugal fan is connected to the air outlet of the activated carbon adsorber, and the centrifugal fan discharges the treated waste gas into the exhaust pipe.

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