Protein drying waste gas treatment system and method

Abstract

The invention discloses a protein drying waste gas treatment system and method. The system comprises a spraying water tank used for providing spraying water for a dust removal tower; the dust removal tower is used for spraying water to the internal waste gas so as to remove dust from the waste gas; the mash tank is used for collecting mash generated by the dust removal tower; the concentrated alkali tank is used for providing alkali liquor for the deodorization tower; the deodorization tower is used for deodorizing the dedusted waste gas through alkali liquor; the monitoring device is used for detecting the waste gas pressure of the currently-running dust removal tower and the waste gas temperature of the currently-running deodorization tower, if the waste gas pressure meets a preset first switching condition, the currently-running dust removal tower is controlled to stop running, a standby dust removal tower is started to run, and the standby dust removal tower is the dust removal tower except the currently-running dust removal tower; if the temperature of the waste gas meets a preset second switching condition, the currently-running deodorization tower is controlled to stop running, a standby deodorization tower is started to run, and the standby deodorization tower is the deodorization tower except the currently-running deodorization tower. The system can eliminate the odor of the waste gas.

Description

Technical Field

[0001] The present invention relates to the technical field of waste gas treatment, and in particular to a protein drying waste gas treatment system and method. Background Art

[0002] Industrial tail gas is usually recycled by burning for heating or power generation, but this method will emit a large amount of pollutants, such as CO2, SO2 and dust, which will cause serious harm to the environment. Using industrial tail gas as raw material to directly convert into liquid ethanol and bacterial protein can effectively reduce pollutant emissions and play a positive role in controlling haze weather and protecting the environment. Coal gas fermentation to ethanol technology is a new technology that uses carbon monoxide as a carbon source to produce ethanol through bacterial biofermentation, but its fermentation wastewater contains a large amount of bacterial protein, which increases the difficulty of sewage treatment.

[0003] Since the bacterial protein component in fermentation wastewater is single and the crude protein content is high, in the existing technology, protein is extracted from the fermentation wastewater and made into high-value-added protein feed for feeding aquatic products and livestock and poultry, which has high environmental value and economic significance.

[0004] However, the extracted protein needs to be concentrated by centrifugation and spray dried, and a large amount of waste gas will be generated during the spray drying process. These waste gases will pollute the environment and have a strong odor, which does not meet the emission standards. Therefore, how to make the waste gas meet the emission standards is a technical problem that needs to be solved urgently. Summary of the invention

[0005] In view of the above problems, the present invention is proposed to provide a protein drying waste gas treatment system and method for solving the above problems. Protein powder in the waste gas can be removed by a dust removal tower, and acidic gas in the waste gas can be removed by a deodorization tower, so that the waste gas can meet the emission standards. In addition, through the design of multiple dust removal towers and multiple deodorization towers that serve as backup for each other, if some dust removal towers or deodorization towers are blocked, they can be switched to other dust removal towers or deodorization towers for waste gas treatment, thereby ensuring the efficiency and effect of waste gas treatment.

[0006] In a first aspect, the present invention provides a protein drying waste gas treatment system, the system comprising a dust removal tower, a deodorization tower, a monitoring device, and a spray water tank connected to the dust removal tower and the spray water inlet of the deodorization tower, a mash tank connected to the waste liquid outlet of the dust removal tower, a concentrated alkali tank connected to the alkali liquid inlet of the deodorization tower, the gas phase outlet of the dust removal tower is connected to the first waste gas inlet of the deodorization tower, and the monitoring device is connected to the dust removal tower and the deodorization tower respectively;

[0007] The spray water tank is used to provide spray water for the dust removal tower;

[0008] The number of the dust removal towers is at least two, and the dust removal towers are used to spray water into the exhaust gas inside to remove dust from the exhaust gas;

[0009] The mash tank is used to collect the mash produced by the dust removal tower, wherein the mash includes water and protein powder; the concentrated alkali tank is used to provide alkali solution for the deodorization tower;

[0010] The number of the deodorizing towers is at least two, and they are used to deodorize the waste gas after dust removal by using the alkali solution;

[0011] The monitoring device is used to detect the exhaust gas pressure of the currently operating dust removal tower and the exhaust gas temperature of the currently operating deodorizing tower. If the exhaust gas pressure meets the preset first switching condition, the currently operating dust removal tower is controlled to stop running and the standby dust removal tower is started to run, and the standby dust removal tower is a dust removal tower other than the currently operating dust removal tower; if the exhaust gas temperature meets the preset second switching condition, the currently operating deodorizing tower is controlled to stop running and the standby deodorizing tower is started to run, and the standby deodorizing tower is a deodorizing tower other than the currently operating deodorizing tower.

[0012] Optionally, the dust removal tower includes a first shell, in which a swirl plate layer, a first spray device, a first baffle plate layer and a second spray device are arranged from bottom to top in sequence, the first spray device and the second spray device are connected to the spray water tank through the spray water inlet, the swirl plate layer includes at least two layers of swirl plates, and the swirl plates are used to make the exhaust gas generate a swirl;

[0013] The first spraying device is used to spray water to the cyclone plate layer at a first flow rate;

[0014] The second spraying device is used to spray water toward the first baffle at the first flow rate.

[0015] Optionally, the first spray device is connected to the monitoring device, and the monitoring device is further used for:

[0016] If the exhaust gas pressure satisfies the first switching condition, controlling the second spraying device to spray water toward the first baffle at a second flow rate;

[0017] Wherein, the first flow rate is smaller than the second flow rate.

[0018] Optionally, the monitoring device is also used to control the rotation speed of the swirl plate according to the exhaust gas pressure.

[0019] Optionally, a mash trough is provided on the inner wall of the first shell and is arranged below the cyclone plate layer for collecting the mash; the discharge port of the mash trough is connected to the mash tank, and the discharge port of the mash trough is used to discharge the collected mash into the mash tank.

[0020] Optionally, the monitoring device is also used to detect the pH of the deodorization tower. If the pH is less than a preset pH threshold, the concentrated alkali tank is controlled to transport alkali solution to the deodorization tower.

[0021] Optionally, the monitoring device is also used to detect the liquid level of the concentrated alkali tank. If the liquid level is lower than a preset liquid level threshold, the supply of alkali solution to the deodorization tower is stopped.

[0022] Optionally, the deodorizing tower comprises a second shell, in which a filling bin, a third spray device, a second baffle and a fourth spray device are arranged in sequence from bottom to top, the third spray device and the fourth spray device are connected to the spray water tank through the spray water inlet, the filling bin comprises a plurality of filling areas and a stainless steel wire mesh, two adjacent filling areas are separated by a partition, a filling ring is arranged in each filling area, and the stainless steel wire mesh covers the top of each filling area;

[0023] The third spraying device is used to spray water to the filling bin at a first flow rate;

[0024] The fourth spraying device is used to spray water toward the second baffle at the first flow rate.

[0025] Optionally, the fourth spray device is connected to the monitoring device, and the monitoring device is further used for:

[0026] If the exhaust gas temperature satisfies the second switching condition, controlling the fourth spray device to spray water toward the second baffle at a second flow rate;

[0027] Wherein, the first flow rate is smaller than the second flow rate.

[0028] In a second aspect, the present invention provides a method for treating protein drying waste gas, the method comprising:

[0029] Obtain the exhaust gas pressure of the currently operating dust removal tower and the exhaust gas temperature of the currently operating deodorization tower;

[0030] If the exhaust gas pressure meets the preset first switching condition, the currently running dust removal tower is controlled to stop running and the standby dust removal tower is started to run, and the standby dust removal tower is a dust removal tower other than the currently running dust removal tower;

[0031] If the exhaust gas temperature meets the preset second switching condition, the currently running deodorizing tower is controlled to stop running and the standby deodorizing tower is started to run, and the standby deodorizing tower is a deodorizing tower other than the currently running deodorizing tower.

[0032] The technical solution provided in the embodiments of the present invention has at least the following technical effects or advantages:

[0033] A protein drying waste gas treatment system and method provided by an embodiment of the present invention comprises a dust removal tower, a deodorization tower, a monitoring device, and a spray water tank connected to the spray water inlet of the dust removal tower and the deodorization tower, a mash tank connected to the waste liquid outlet of the dust removal tower, a concentrated alkali tank connected to the alkali solution inlet of the deodorization tower, a gas phase outlet of the dust removal tower is connected to the first waste gas inlet of the deodorization tower, and the monitoring device is connected to the dust removal tower and the deodorization tower respectively; the spray water tank is used to provide water for spraying to the dust removal tower; the number of dust removal towers is at least two, and they are used to spray water to the internal waste gas to remove dust from the waste gas; the mash tank is used to collect the mash produced by the dust removal tower, and the mash includes water and protein powder; the concentrated alkali tank is used to provide alkali solution to the deodorization tower; the number of deodorization towers is at least two, and they are used to deodorize the waste gas after dust removal by alkali solution, thereby eliminating the odor of the waste gas to meet the emission standards.

[0034] At the same time, the monitoring device is used to detect the exhaust gas pressure of the currently operating dust removal tower and the exhaust gas temperature of the currently operating deodorizing tower. If the exhaust gas pressure meets the preset first switching condition, the currently operating dust removal tower is controlled to stop running and the standby dust removal tower is started to run. The standby dust removal tower is a dust removal tower other than the currently operating dust removal tower. If the exhaust gas temperature meets the preset second switching condition, the currently operating deodorizing tower is controlled to stop running and the standby deodorizing tower is started to run. The standby deodorizing tower is a deodorizing tower other than the currently operating deodorizing tower. The main and standby switching can be realized to ensure the efficiency and effect of exhaust gas treatment.

[0035] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0037] Figure 1 It is a structural schematic diagram of a protein drying waste gas treatment system provided in an embodiment of the present application;

[0038] Figure 2 It is a structural schematic diagram of a dust removal tower provided in an embodiment of the present application;

[0039] Figure 3 It is a structural schematic diagram of a mash tank provided in an embodiment of the present application;

[0040] Figure 4 It is a structural schematic diagram of a deodorizing tower provided in an embodiment of the present application;

[0041] Figure 5 It is a flow chart of a method for treating protein drying waste gas provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the present application clearer, the implementation mode of the present application will be further described in detail below in conjunction with the accompanying drawings. It should be understood that the embodiments of the present disclosure and the specific features in the embodiments are detailed descriptions of the technical solutions of the present application, rather than limitations on the technical solutions of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other.

[0043] Figure 1 is a structural schematic diagram of a protein drying waste gas treatment system provided in an embodiment of the present application, such as Figure 1 As shown, the system includes: a dust removal tower 002, a deodorization tower 003, a monitoring device (not shown in the figure), and a spray water tank 004 connected to the spray water inlets of the dust removal tower 002 and the deodorization tower 003 respectively, a mash tank connected to the waste liquid outlet of the dust removal tower 002, a concentrated alkali tank 005 connected to the alkali liquid inlet of the deodorization tower 003, the gas phase outlet of the dust removal tower 002 is connected to the first waste gas inlet of the deodorization tower 003, and the monitoring device is connected to the dust removal tower 002 and the deodorization tower 003 respectively.

[0044] The spray water tank 004 is used to provide spray water for the dust removal tower 002;

[0045] There are at least two dust removal towers 002, which are used to spray water into the exhaust gas inside to remove dust from the exhaust gas;

[0046] The mash tank is used to collect the mash produced by the dust removal tower 002, and the mash includes water and protein powder; the concentrated alkali tank 005 is used to provide alkali solution for the deodorization tower 003;

[0047] The number of deodorizing towers 003 is at least two, and they are used to deodorize the waste gas after dust removal by using alkaline solution;

[0048] The monitoring device is used to detect the exhaust gas pressure of the currently operating dust removal tower and the exhaust gas temperature of the currently operating deodorizing tower. If the exhaust gas pressure meets the preset first switching condition, the currently operating dust removal tower is controlled to stop running and the standby dust removal tower is started to run. The standby dust removal tower is a dust removal tower other than the currently operating dust removal tower. If the exhaust gas temperature meets the preset second switching condition, the currently operating deodorizing tower is controlled to stop running and the standby deodorizing tower is started to run. The standby deodorizing tower is a deodorizing tower other than the currently operating deodorizing tower.

[0049] In the embodiment of the present application, the system also includes an induced draft fan 001, which is connected to the second exhaust gas inlet 201 of the dust removal tower 002, and is used to introduce the exhaust gas after the ethanol Clostridium protein is dried into the dust removal tower 002. The exhaust gas in the dust removal tower 002 is fully in contact with the sprayed water, and the water absorbs the protein powder and other dust in the exhaust gas, and the water and dust are mixed to form a mash. Among them, the protein powder and other dust collide, adhere, condense, centrifuge and other comprehensive effects with the atomized spray water, and the centrifugal force causes the mash that absorbs the protein powder and other dust to be thrown onto the tower wall, and flows to the waste liquid outlet at the bottom of the tower with the water film on the tower wall, and is discharged into the mash tank through the waste liquid outlet.

[0050] Next, the waste gas after dust removal in the dust removal tower 002 flows into the deodorization tower 003 from the gas phase outlet through the first waste gas inlet at the bottom of the deodorization tower 003. The alkali solution in the deodorization tower 003 fully contacts the waste gas, and "acid-base neutralization" occurs, removing the acid gas in the waste gas and eliminating the odor of the waste gas. Finally, the waste gas after dust removal and deodorization is freed of protein powder and acid gas, thereby eliminating the odor of the waste gas and making it meet the standards. It flows from the top of the deodorization tower 003 through the chimney to the volatile organic compounds (VOCs) monitoring system, and is discharged after the VOC system detects and confirms that it meets the standards.

[0051] In an embodiment of the present application, the mash in the mash tank can be pumped to a centrifugal system for concentration by a mash pump, and then spray-dried into protein powder by a drying system after concentration. The waste gas generated during the drying process can be introduced into the dust removal tower 002 through the induced draft fan 001 for circulation treatment.

[0052] The monitoring device may include a detection module and a control module that are interconnected. The detection module may include a sensor for detecting the working status signal of the system, such as the exhaust gas pressure of the currently running dust removal tower 002 and the exhaust gas temperature of the currently running deodorization tower, and sending the working status signal to the control module. The control module is used to control the start and stop and opening and closing of each device of the system according to the working status signal. For example, according to the received exhaust gas pressure and exhaust gas temperature, the start and stop of the dust removal tower 002 and the deodorization tower 003 are controlled, specifically for:

[0053] If the exhaust gas pressure meets the preset first switching condition, it means that the currently running dust removal tower is blocked, then the currently running dust removal tower is controlled to stop running and the standby dust removal tower is started, and the standby dust removal tower is a dust removal tower other than the currently running dust removal tower; if the exhaust gas temperature meets the preset second switching condition, it means that the currently running deodorization tower is blocked, then the currently running deodorization tower is controlled to stop running and the standby deodorization tower is started, and the standby deodorization tower is a deodorization tower other than the currently running deodorization tower. Among them, the first switching condition is that the exhaust gas pressure is greater than the preset pressure threshold, and the second switching condition is that the exhaust gas temperature is greater than the preset temperature threshold. Exemplarily, the pressure threshold is 1000Pa and the temperature threshold is 80°C.

[0054] That is to say, multiple dust removal towers 002 serve as backup for each other, and multiple deodorization towers 003 also serve as backup for each other. When the currently operating dust removal tower or deodorization tower is blocked, the waste gas treatment is switched to other dust removal towers or deodorization towers, thereby ensuring the efficiency and effect of the waste gas treatment.

[0055] In the embodiment of the present application, in order to save costs, there can be two dust removal towers 002 and two deodorization towers 003. Figure 1 As shown, the induced draft fan 001 can be connected to the two dust removal towers 002 through the three-way reversing valve XV001, and the gas phase outlets of the two dust removal towers 002 are respectively connected to the first exhaust gas inlets of the two deodorization towers 003. The two dust removal towers 002 are standby for each other, and the two deodorization towers 003 are also standby for each other.

[0056] In an embodiment of the present application, a dust removal tower and a deodorization tower may constitute a combination tower, and multiple combination towers may be obtained, and the multiple combination towers serve as backup for each other. When the monitoring device detects that the exhaust gas pressure in the currently running combination tower is greater than the pressure threshold and the exhaust gas temperature is greater than the temperature threshold, the currently running combination tower is controlled to stop running and the backup combination tower is controlled to run. Among them, the main and backup switching can be achieved by controlling the opening and closing of the two air outlets of the three-way reversing valve XV001. For example, the piston valve of the three-way reversing valve XV001 is controlled to drive the central axis to move, and the central flap is directed to one side of the currently running dust removal tower, so that the exhaust gas no longer flows to the currently running dust removal tower, but flows to the backup dust removal tower, thereby switching the blocked combination tower to the backup combination tower for operation.

[0057] In an embodiment of the present application, the dust removal tower 002 and the deodorization tower 003 can share a spray water tank 004, or each can be configured with a spray water tank 004, that is, the spray water tank 004 includes a first spray water tank and a second spray water tank, the first spray water tank is connected to the spray water inlet of the dust removal tower 002, and the second spray water tank is connected to the spray water inlet of the deodorization tower 003. At this time, the concentrated alkali tank 005 can be connected to the alkali solution inlet of the deodorization tower 003 through the second spray water tank, and the alkali solution inlet and the spray water inlet are the same port. After the alkali solution in the concentrated alkali tank 005 enters the second spray water tank, it is mixed with the water therein and then sprayed into the deodorization tower 003. The first spray water tank includes a first water replenishment valve XV006. When the first water replenishment valve XV006 is opened, the first spray water tank can be replenished with water. The second spray water tank includes a second water replenishment valve XV007. When the second water replenishment valve XV007 is opened, the second spray water tank can be replenished with water.

[0058] Optionally, the dust removal tower 002 includes a first shell, in which a swirl plate layer 202, a first spray device, a first baffle layer and a second spray device are arranged from bottom to top, and the first spray device and the second spray device are connected to the spray water tank 004 through a spray water inlet. The swirl plate layer includes at least two layers of swirl plates, and the swirl plates are used to make the exhaust gas produce a swirl; the first spray device is used to spray water to the swirl plate layer at a first flow rate; the second spray device is used to spray water to the first baffle at a first flow rate.

[0059] Among them, the dust removal tower 002 can be a cyclone dust removal tower.

[0060] Figure 2 Schematic diagram of the structure of a dust removal tower provided in the embodiment of the present application. Figure 2 As shown, the dust removal tower 002 includes a second exhaust gas inlet 201, a cyclone plate layer 202, a water inlet 203 of a first spray device, a first baffle 204, a water inlet 205 of a second spray device, a gas phase outlet 206 of the dust removal tower 002, a dust removal tower water outlet 207, a dust removal tower manhole 208, and a first spray device 209 and a second spray device 210.

[0061] It can be understood that the exhaust gas introduced by the induced draft fan 001 enters the first shell tangentially through the three-way reversing valve XV001 and the second exhaust gas inlet 201, and the exhaust gas rotates to a certain extent under the action of the swirl plate, and fully contacts with the water sprayed downward by the first spray device 209. The exhaust gas and water move relative to each other in the tower. This relative movement forms a large water film on the swirl plate, which greatly enhances the effect of water in absorbing dust such as protein powder.

[0062] The size of the dust removal tower 002 is Φ4600*7800mm. There are 6 manholes in the dust removal tower 002, which is not only convenient for the process personnel to check the operation after parking, but also improves the efficiency of later maintenance, such as the maintenance of the spray device blockage. There are at least two layers of swirl plates in the swirl plate layer 202 to improve the swirl effect of the swirl layer and increase the strength of water adsorption of protein powder and other dust. A first spray device 209 is provided on the top of the top swirl plate.

[0063] In the embodiment of the present application, the spray water inlet of the dust removal tower 002 is connected to the spray water tank 004 through a circulating water pump and a spray pneumatic valve, and the spray pneumatic valve is electrically connected to a monitoring device, which is used to control the switch of the spray pneumatic valve. Figure 1 As shown, the dust removal tower 002 includes a first dust removal tower and a second dust removal tower, the circulating water pump includes a first circulating water pump 401A and a second circulating water pump 401B, and the spray pneumatic valve includes a first spray pneumatic valve XV002 and a second spray pneumatic valve XV003, the spray water outlet of the first dust removal tower is connected to the first spray water tank through the first spray pneumatic valve XV002 and the first circulating water pump 401A, and the spray water outlet of the second dust removal tower is connected to the first spray water tank through the second spray pneumatic valve XV003 and the second circulating water pump 401B.

[0064] After the monitoring device opens the first spray pneumatic valve XV002 (or the second spray pneumatic valve XV003) and starts the first circulating water pump 401A (or the second circulating water pump 401B), the first circulating water pump 401A (or the second circulating water pump 401B) will introduce the circulating water of the spray water tank 004 into the first spray device 209 and the second spray device 210. The first spray device 209 and the second spray device 210 both include a spray water distributor, on which spiral nozzles are evenly distributed. The spiral nozzles atomize the circulating water and spray it out to wash and cool the exhaust gas; the water flowing to the bottom of the first shell flows back to the spray water tank 004 from the dust removal tower outlet 207, and then is recycled. In order to ensure the quality of the circulating water, the circulating water can also be regularly discharged from the sewage valve at the bottom of the spray water tank 004 and sent to sewage treatment to prevent the accumulation and fermentation of impurities to produce odor.

[0065] The circulating water pump can be started with one button or manually. In the one-button start, the circulating water pump will slowly increase the frequency from the initial frequency to the target frequency. The initial frequency is 32HZ and the target frequency is 36HZ. The initial frequency and target frequency can be modified and set according to the actual situation. The flow rate is controlled by controlling the frequency. The frequency corresponding to the first flow rate is the target frequency.

[0066] Optionally, the first spray device 209 is connected to a monitoring device, and the monitoring device is also used for:

[0067] If the exhaust gas pressure satisfies the first switching condition, the second spray device 210 is controlled to spray water toward the first baffle 204 at a second flow rate.

[0068] It can be understood that if the exhaust gas pressure meets the first switching condition, it means that the dust collector is blocked, and the blockage of the dust collector is basically the blockage of the baffle, so the first baffle 204 can be flushed by the second spray device 210 to eliminate the blockage. The duration and interval of flushing are controlled by the control module, and the duration and interval can be modified and set according to actual conditions. For example, the duration of flushing is 3 hours.

[0069] The first flow rate is less than the second flow rate, so that the second spray device 210 performs flushing with a greater water pressure, thereby improving the flushing effect. The frequency corresponding to the second flow rate is the flushing frequency, for example, the flushing frequency is 47 Hz, and the maximum frequency is 50 Hz. After the flushing time is reached, the flushing is stopped, and the frequency of the circulating water pump corresponding to the first spray device 209 is controlled to drop from the flushing frequency to 0.

[0070] Optionally, the monitoring device is also used to control the rotation speed of the swirl plate according to the exhaust gas pressure.

[0071] In the embodiment of the present application, in order to ensure the swirl effect caused by the swirl plate, the rotation speed of the swirl plate can be adjusted, and different rotation speeds cause different swirl effects. However, how strong the swirl effect is required can be determined according to the exhaust gas pressure, so the rotation speed of the swirl plate is controlled according to the exhaust gas pressure.

[0072] Optionally, a mash trough is provided on the inner wall of the first shell and arranged below the cyclone plate layer 202 for collecting mash; the drain outlet of the mash trough is connected to the mash tank, and the drain outlet of the mash trough is used to discharge the collected mash into the mash tank.

[0073] Figure 3 is a schematic diagram of the structure of a mash tank provided in an embodiment of the present application, such as Figure 3 As shown, the first mash tank 006-1 of the first dust removal tower and the second mash tank 006-2 of the second dust removal tower both include a drain port 601 and a sewage port 602. The drain port 601 is connected to the mash tank 007 for discharging the mash, and the sewage port 602 is used to discharge the water used for flushing the first baffle 204. When the waste gas is treated, the drain port 601 is opened and the sewage port 602 is closed; when flushing the first baffle 204, the drain port 601 is closed and the sewage port 602 is opened.

[0074] like Figure 3As shown, the drain outlets 601 of the first mash tank 006-1 and the second mash tank 006-2 are connected to the mash tank 007 through the first mash pneumatic valve XV011-1 and the second mash pneumatic valve XV011-2, respectively. The mash tank is connected to the mash pump 701, and the mash is drained and stopped by opening and closing the first mash pneumatic valve XV011-1 and the second mash pneumatic valve XV011-2. The sewage outlets 602 of the first mash tank 006-1 and the second mash tank 006-2 are connected to the first spray water tank through the first sewage pneumatic valve XV010-1 and the second sewage pneumatic valve XV010-2, respectively, so that the water used for flushing can flow back to the first spray water tank for recycling.

[0075] It can be understood that, through the rotation of the cyclone plate in the first shell, the protein powder and other dust undergo a comprehensive effect of collision, adhesion, agglomeration, centrifugal separation, etc. with the atomized circulating water. These effects cause the protein powder to be thrown to the tower wall, flow to the bottom of the tower along the water film on the tower wall, and be collected by the mash tank and discharged to the mash tank 007 through the drainage outlet.

[0076] Optionally, the monitoring device is also used to detect the pH value of the deodorization tower 003 . If the pH value is less than a preset pH value threshold value, the concentrated alkali tank 005 is controlled to transport alkali solution to the deodorization tower 003 .

[0077] In the embodiment of the present application, if the pH value is less than the preset pH value threshold value, it means that the alkali solution in the deodorization tower 003 is insufficient to neutralize the acidic gas in the exhaust gas, and the concentrated alkali tank 005 is controlled to transport alkali solution to the deodorization tower 003 to ensure that there is enough alkali solution to neutralize the acidic gas in the exhaust gas. The pH value of the deodorization tower 003 can be recorded as the first pH value, and the corresponding pH value threshold value is recorded as the first pH value threshold value.

[0078] like Figure 1 As shown, the deodorizing tower 003 includes a first deodorizing tower and a second deodorizing tower, the concentrated alkali tank 005 is connected to the second spray water tank through the alkali replenishing pump 501 and the alkali replenishing valve XV009 in turn, the second spray water tank is connected to the first deodorizing tower through the third circulating water pump 402A and the third pneumatic valve XV004 in turn, and the second spray water tank is connected to the second deodorizing tower through the fourth circulating water pump 402B and the fourth pneumatic valve XV005 in turn. The alkali solution in the concentrated alkali tank 005 enters the second spray water tank and mixes with the water therein to become alkaline water, which is sprayed into the deodorizing tower 003. Therefore, the monitoring device is also used to detect the second pH value of the second spray water tank. If the second pH value is less than the preset second pH value threshold, the concentrated alkali tank 005 is controlled to transport the alkali solution to the second spray water tank, that is, the alkali replenishing pump is controlled to operate, the alkali replenishing valve is opened, and the alkali solution in the concentrated alkali tank 005 is added to the second spray water tank. The second pH value threshold can be 6.

[0079] Optionally, the monitoring device is also used to detect the liquid level of the concentrated alkali tank 005. If the liquid level is lower than a preset liquid level threshold, the delivery of alkali solution to the deodorization tower 003 is stopped.

[0080] In the embodiment of the present application, when the pH is low, alkali is replenished; when the liquid level is low, alkali replenishment is stopped. The concentrated alkali tank 005 includes an alkali replenishing pneumatic valve XV008. If the monitoring device detects that the liquid level is lower than the preset liquid level threshold, the alkali replenishing pneumatic valve is controlled to open to replenish alkali into the concentrated alkali tank 005; if the liquid level is higher than the preset maximum threshold, the alkali replenishing pneumatic valve is controlled to close, and alkali replenishment into the concentrated alkali tank 005 is stopped. Among them, the liquid level threshold can be 0.1m, and the maximum threshold is 1m. The concentrated alkali storage tank is used to replenish alkali for the concentrated alkali tank 005. Due to the height difference between the concentrated alkali storage tank and the concentrated alkali tank 005, the alkali replenishing method is gravity flow.

[0081] In the embodiment of the present application, the monitoring device is also used to: if the concentrated alkali tank 005 is connected to the second spray water tank and the liquid level is lower than a preset liquid level threshold, then control the concentrated alkali tank 005 to stop transporting alkali solution to the second spray water tank.

[0082] Optionally, the deodorization tower 003 includes a second shell, in which a filling bin, a third spray device, a second baffle and a fourth spray device are arranged from bottom to top in sequence, the third spray device and the fourth spray device are connected to the spray water tank 004 through a spray water inlet, the filling bin includes multiple filling areas and stainless steel wire mesh, two adjacent filling areas are separated by a partition, a filling ring is arranged in each filling area, and a stainless steel wire mesh covers the top of each filling area.

[0083] The third spray device is used for spraying water toward the filling bin at a first flow rate; the fourth spray device is used for spraying water toward the second baffle at a first flow rate.

[0084] Figure 4 Schematic diagram of a deodorizing tower provided in the embodiment of the present application. Figure 4 As shown, the deodorizing tower 003 includes a first exhaust gas inlet 301, a filling bin 302, a water inlet 303 of a third spraying device, a second baffle 304, a water inlet 305 of a fourth spraying device, a gas phase outlet 306 of the deodorizing tower 003, a deodorizing tower circulating water outlet 307 and a deodorizing tower manhole 308, as well as a third spraying device 309 and a fourth spraying device 310.

[0085] Among them, the packing bin is divided into four packing areas, and each packing area is arranged with packing rings in a stepped manner. After the packing rings are filled in the packing area, they are covered with a detachable stainless steel wire mesh, which can effectively divide the packing rings, ensure gas-liquid contact, and better neutralize the acid and alkali. The alkaline spray water will form a certain water film on the packing rings. When the waste gas passes through the packing bin, it is not only fully neutralized with the alkali solution, but also undergoes secondary dust removal. The waste gas after acid and alkali neutralization is defogged by the baffle and discharged from the top of the deodorization tower 003. A stainless steel mesh is provided at the bottom of the deodorization tower 003 to effectively intercept falling impurities (such as aging and broken packing ring slag) to avoid the jamming of valves or pump bodies and the blockage of pipelines; the deodorization tower 003 is provided with 6 manholes, which not only facilitates the operation inspection of process personnel after parking, but also improves the efficiency of later maintenance, such as the maintenance of spray head blockage.

[0086] A circulating water pump and a spray pneumatic valve are provided between the spray water inlet of the deodorizing tower 003 and the spray water tank 004, and the timer, the detection module, and the control module can realize the online timing spraying of the second baffle and the offline spraying when blocked. For example, the size of the deodorizing tower 003 is Φ4600*7800mm.

[0087] like Figure 1 As shown, the deodorizing tower 003 includes a first deodorizing tower and a second deodorizing tower, the circulating water pump includes a third circulating water pump 402A and a fourth circulating water pump 402B, the spray pneumatic valve includes a third spray pneumatic valve XV004 and a fourth spray pneumatic valve XV005, the spray water outlet of the first dust removal tower is connected to the second spray water tank through the third spray pneumatic valve XV0042 and the third circulating water pump 4021A, and the spray water outlet of the second dust removal tower is connected to the second spray water tank through the fourth spray pneumatic valve XV005 and the fourth circulating water pump 405B.

[0088] Optionally, the fourth spray device is connected to a monitoring device, and the monitoring device is further used for:

[0089] If the exhaust gas temperature meets the second switching condition, the fourth spray device is controlled to spray water toward the second baffle at a second flow rate.

[0090] In an embodiment of the present application, if the exhaust gas temperature meets the second switching condition, it means that the deodorization tower 003 is blocked, resulting in the exhaust gas temperature being too high. The fourth spray device is controlled to spray water to the second baffle at a second flow rate to flush the second baffle and eliminate the blockage of the deodorization tower 003.

[0091] The first flow rate is smaller than the second flow rate so as to flush the second baffle plate with a larger water pressure, thereby eliminating the blockage of the deodorization tower 003 as soon as possible.

[0092] In the embodiment of the present application, the monitoring device is connected to each valve to realize the opening and closing control of each valve. The system not only achieves the effect of dust removal and deodorization, recovers protein powder in the exhaust gas to increase revenue, but also realizes automatic control. When the running tower is blocked, it switches to the spare tower in time, and sprays the blocked tower offline, thereby improving production efficiency.

[0093] Exemplarily, when the detection module detects that the exhaust gas pressure of the first dust removal tower is greater than 1000Pa and the exhaust gas temperature of the first deodorization tower is greater than 80°C, the control module starts the spraying device of the second dust removal tower and the second deodorization tower, and controls the three-way reversing valve XV001 to switch the blocked first dust removal tower and the first deodorization tower to the spare second dust removal tower and the second deodorization tower to continue to treat the exhaust gas. After the detection module detects that the spraying device of the second dust removal tower and the second deodorization tower is started, the control module controls the piston valve of the three-way reversing valve XV001 to drive the central axis to move, and guide the central flap to one side of the first dust removal tower, so that the exhaust gas no longer flows to the first dust removal tower but flows to the second dust removal tower, and successfully switches the blocked combination tower to the spare combination tower for operation.

[0094] Next, the control module opens the second spray pneumatic valve XV003 and the fourth spray pneumatic valve XV005, controls the drain outlet 601 to be closed and the sewage outlet 602 to be opened (water is discharged to sewage treatment and purification), controls the frequency of the circulating water pump 401A of the first dust removal tower and the circulating water pump 402A of the first deodorization tower to slowly increase from 36HZ to 47HZ (maximum frequency 50HZ), and the timer sets the flushing time for 3h. The control module controls the flushing to be completed when the timer reaches the timing time, controls the frequency of the circulating water pump 401A of the first dust removal tower and the circulating water pump 402A of the first deodorization tower to slowly decrease from 47HZ to 0HZ (the main motor of the circulating water pump is automatically turned off after 15 minutes of heat dissipation), controls the second spray pneumatic valve XV003, the fourth spray pneumatic valve XV005 and the sewage outlet 602 to be closed, and after the offline flushing of the blocked combination tower is completed, the flushing end signal is fed back to the detection module, waiting for the next startup operation.

[0095] Based on the same inventive concept, the embodiment of the present invention also provides a protein drying waste gas treatment method, which is applicable to a protein drying waste gas treatment system. Figure 5 is a flow chart of a method for treating protein drying waste gas provided by an embodiment of the present invention, such as Figure 5 As shown, the method includes:

[0096] Step S510, obtaining the exhaust gas pressure of the currently operating dust removal tower and the exhaust gas temperature of the currently operating deodorization tower;

[0097] Step S520: If the exhaust gas pressure meets the preset first switching condition, the currently running dust removal tower is controlled to stop running and the standby dust removal tower is started to run, where the standby dust removal tower is a dust removal tower other than the currently running dust removal tower;

[0098] Step S530: If the exhaust gas temperature meets the preset second switching condition, the currently running deodorizing tower is controlled to stop running and the standby deodorizing tower is started to run. The standby deodorizing tower is a deodorizing tower other than the currently running deodorizing tower.

[0099] An embodiment of the present invention further provides an electronic device, which may include a processor and a memory, wherein the processor and the memory may be communicatively connected to each other via a bus or other means.

[0100] The processor may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiments of the present application, or may also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components and other chips, or a combination of the above-mentioned chips.

[0101] The memory may include a large capacity memory for data or instructions. By way of example and not limitation, the memory may include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive or a combination of two or more of these. Where appropriate, the memory may include a removable or non-removable (or fixed) medium. Where appropriate, the memory may be inside or outside the electronic device. In a particular embodiment, the memory may be a non-volatile solid-state memory.

[0102] In one example, the memory may be a read-only memory (ROM). In one example, the ROM may be a mask-programmed ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), an electrically rewritable ROM (EAROM), or a flash memory, or a combination of two or more of these.

[0103] The processor implements any one of the protein drying waste gas treatment methods in the above embodiments by reading and executing computer program instructions stored in the memory.

[0104] In one example, the electronic device may further include a communication interface and a bus. Among them, the processor, memory, and communication interface are connected through a bus and communicate with each other. The communication interface is mainly used to realize the communication between the modules, devices, units and / or devices in the embodiment of the present application. Where appropriate, the bus may include one or more buses.

[0105] In addition, in combination with the protein drying waste gas treatment method in the above embodiment, the embodiment of the present invention can provide a computer-readable storage medium for implementation. The computer-readable storage medium stores computer program instructions; when the computer program instructions are executed by a processor, any one of the protein drying waste gas treatment methods in the above embodiment is implemented.

[0106] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program, and the program can be stored in a computer-readable storage medium, and when the program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, the storage medium can be a read-only memory (ROM), a random access memory (RAM), a flash memory, a hard disk drive (HDD) or a solid-state drive (SSD), etc.; the storage medium can also include a combination of the above-mentioned types of memory.

[0107] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0108] A protein drying waste gas treatment system and method provided by an embodiment of the present invention comprises a dust removal tower, a deodorization tower, a monitoring device, and a spray water tank connected to the spray water inlet of the dust removal tower and the deodorization tower, a mash tank connected to the waste liquid outlet of the dust removal tower, a concentrated alkali tank connected to the alkali liquid inlet of the deodorization tower, a gas phase outlet 206 of the dust removal tower is connected to the first waste gas inlet of the deodorization tower, and the monitoring device is connected to the dust removal tower and the deodorization tower respectively; the spray water tank is used to provide spray water for the dust removal tower; the number of dust removal towers is at least two, and they are used to spray water to the internal waste gas to remove dust from the waste gas; the mash tank is used to collect the mash produced by the dust removal tower, and the mash includes spray water and protein powder; the concentrated alkali tank is used to provide alkali liquid for the deodorization tower; the number of deodorization towers is at least two, and they are used to deodorize the waste gas after dust removal by alkali liquid, thereby eliminating the odor of the waste gas to meet the emission standards.

[0109] At the same time, the monitoring device is used to detect the exhaust gas pressure of the currently operating dust removal tower and the exhaust gas temperature of the currently operating deodorizing tower. If the exhaust gas pressure meets the preset first switching condition, the currently operating dust removal tower is controlled to stop running and the standby dust removal tower is started to run. The standby dust removal tower is a dust removal tower other than the currently operating dust removal tower. If the exhaust gas temperature meets the preset second switching condition, the currently operating deodorizing tower is controlled to stop running and the standby deodorizing tower is started to run. The standby deodorizing tower is a deodorizing tower other than the currently operating deodorizing tower. The main and standby switching can be realized to ensure the efficiency and effect of exhaust gas treatment.

[0110] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0111] Similarly, it should be understood that in order to streamline the present disclosure and aid in understanding one or more of the various inventive aspects, in the above description of exemplary embodiments of the present invention, various features of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, this disclosed method should not be interpreted as reflecting the intention that the claimed invention requires more features than those explicitly recited in each claim. More specifically, as reflected in the claims below, inventive aspects lie in less than all the features of the individual embodiments disclosed above. Therefore, the claims that follow the specific embodiment are hereby expressly incorporated into the specific embodiment, with each claim itself serving as a separate embodiment of the present invention.

[0112] It should be noted that the above embodiments illustrate the present invention rather than limit it, and that those skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets shall not be construed as a limitation on the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claims. The word "one" or "an" preceding a component does not exclude the presence of a plurality of such components. The present invention may be implemented by means of hardware comprising a number of different components and by means of a suitably programmed computer. In a unit claim enumerating a number of devices, several of these devices may be embodied by the same hardware item. The use of the words first, second, and third, etc., does not indicate any order. These words may be interpreted as names.

Claims

1. A protein drying waste gas treatment system, characterized in that: The system comprises a dust removal tower, a deodorization tower, a monitoring device, and a spray water tank connected to the dust removal tower and the spray water inlet of the deodorization tower, a mash tank connected to the waste liquid outlet of the dust removal tower, a concentrated alkali tank connected to the alkali liquid inlet of the deodorization tower, a gas phase outlet of the dust removal tower is connected to the first waste gas inlet of the deodorization tower, and the monitoring device is connected to the dust removal tower and the deodorization tower respectively; The spray water tank is used to provide spray water for the dust removal tower; The number of the dust removal towers is at least two, and the dust removal towers are used to spray water into the exhaust gas inside to remove dust from the exhaust gas; The mash tank is used to collect the mash produced by the dust removal tower, wherein the mash includes water and protein powder; the concentrated alkali tank is used to provide alkali solution for the deodorization tower; The number of the deodorizing towers is at least two, and they are used to deodorize the waste gas after dust removal by using the alkali solution; The monitoring device is used to detect the exhaust gas pressure of the currently operating dust removal tower and the exhaust gas temperature of the currently operating deodorizing tower. If the exhaust gas pressure meets the preset first switching condition, the currently operating dust removal tower is controlled to stop running and the standby dust removal tower is started to run, and the standby dust removal tower is a dust removal tower other than the currently operating dust removal tower; if the exhaust gas temperature meets the preset second switching condition, the currently operating deodorizing tower is controlled to stop running and the standby deodorizing tower is started to run, and the standby deodorizing tower is a deodorizing tower other than the currently operating deodorizing tower.

2. The protein drying waste gas treatment system according to claim 1, characterized in that: The dust removal tower comprises a first shell, in which a swirl plate layer, a first spray device, a first baffle plate layer and a second spray device are arranged in sequence from bottom to top, the first spray device and the second spray device are connected to the spray water tank through the spray water inlet, the swirl plate layer comprises at least two layers of swirl plates, and the swirl plates are used to make the exhaust gas generate a swirl; The first spraying device is used to spray water to the cyclone plate layer at a first flow rate; The second spraying device is used to spray water toward the first baffle at the first flow rate.

3. The protein drying waste gas treatment system according to claim 2, characterized in that: The first spray device is connected to the monitoring device, and the monitoring device is also used for: If the exhaust gas pressure satisfies the first switching condition, controlling the second spraying device to spray water toward the first baffle at a second flow rate; Wherein, the first flow rate is smaller than the second flow rate.

4. The protein drying waste gas treatment system according to claim 2, characterized in that: The monitoring device is also used to control the rotation speed of the swirl plate according to the exhaust gas pressure.

5. The protein drying waste gas treatment system according to claim 2, characterized in that: A mash tank is provided on the inner wall of the first shell and is arranged below the cyclone plate layer for collecting the mash; The discharge port of the mash tank is communicated with the mash tank, and the discharge port of the mash tank is used to discharge the collected mash into the mash tank.

6. The protein drying waste gas treatment system according to claim 1, characterized in that: The monitoring device is also used to detect the pH of the deodorizing tower. If the pH is less than a preset pH threshold, the concentrated alkali tank is controlled to transport alkali solution to the deodorizing tower.

7. The protein drying waste gas treatment system according to claim 1, characterized in that: The monitoring device is also used to detect the liquid level of the concentrated alkali tank. If the liquid level is lower than a preset liquid level threshold, the alkali solution is stopped from being transported to the deodorization tower.

8. The protein drying waste gas treatment system according to claim 1, characterized in that: The deodorizing tower comprises a second shell, in which a packing bin, a third spray device, a second baffle and a fourth spray device are arranged in sequence from bottom to top, the third spray device and the fourth spray device are connected to the spray water tank through the spray water inlet, the packing bin comprises a plurality of packing areas and a stainless steel wire mesh, two adjacent packing areas are separated by a partition, a packing ring is arranged in each packing area, and the stainless steel wire mesh covers the top of each packing area; The third spraying device is used to spray water to the filling bin at a first flow rate; The fourth spraying device is used to spray water toward the second baffle at the first flow rate.

9. The protein drying waste gas treatment system according to claim 8, characterized in that: The fourth spray device is connected to the monitoring device, and the monitoring device is also used for: If the exhaust gas temperature satisfies the second switching condition, controlling the fourth spray device to spray water toward the second baffle at a second flow rate; Wherein, the first flow rate is smaller than the second flow rate.

10. A method for treating protein drying waste gas, characterized in that: Applicable to the protein drying waste gas treatment system according to any one of claims 1 to 9, the method comprising: Obtain the exhaust gas pressure of the currently operating dust removal tower and the exhaust gas temperature of the currently operating deodorization tower; If the exhaust gas pressure meets the preset first switching condition, the currently running dust removal tower is controlled to stop running and the standby dust removal tower is started to run, and the standby dust removal tower is a dust removal tower other than the currently running dust removal tower; If the exhaust gas temperature meets the preset second switching condition, the currently running deodorizing tower is controlled to stop running and the standby deodorizing tower is started to run, and the standby deodorizing tower is a deodorizing tower other than the currently running deodorizing tower.

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