Waste gas centralized treatment system suitable for electroplating environment-friendly industrial park

Abstract

The utility model discloses a waste gas centralized treatment system suitable for an electroplating environment-friendly industrial park. The waste gas centralized treatment system comprises a waste gas collecting device, a waste gas purifying device and a waste gas discharging device, according to the utility model, the waste gas collecting device is used for collecting acid-base waste gas generated by each electroplating enterprise in a centralized manner, then the chemical absorption tower is used for absorbing, degrading and purifying the acid-base waste gas, and finally the chimney is used for discharging the purified standard gas into the atmosphere, so that the high-efficiency centralized treatment of the waste gas of the electroplating environment-friendly industrial park is realized; the problem that waste gas emission of an electroplating environment-friendly industrial park exceeds the standard is solved; meanwhile, the waste gas centralized treatment system is small in equipment number, small in occupied area and light in self weight, and the problems that waste gas treatment equipment in an electroplating environment-friendly industrial park is scattered in distribution, large in occupied area and incapable of being managed in a unified and standard mode are solved; and finally, the waste gas of the electroplating environment-friendly industrial park is subjected to centralized treatment through the waste gas centralized treatment system, so that the environment-friendly investment of electroplating enterprises is reduced, and the investment cost of the enterprises is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of centralized waste gas treatment, and in particular to a centralized waste gas treatment system suitable for an electroplating environmental protection industrial park. Background Art

[0002] At present, the waste gas generated by the production enterprises in the electroplating park during the production process is treated by themselves through the waste gas treatment systems they have built. This waste gas treatment method has the following problems: (1) The quality of the waste gas treatment equipment installed by each enterprise is uneven, which leads to the problem of excessive waste gas emissions in the electroplating park; (2) There are too many types and quantities of waste gas treatment equipment in the electroplating park, which are scattered and occupy a large area, and cannot be managed in a unified and standardized manner; (3) It causes excessive and repeated environmental protection investment, increasing the investment cost of enterprises. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a centralized waste gas treatment system suitable for an electroplating environmental protection industrial park.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0005] A centralized waste gas treatment system suitable for an electroplating environmental protection industrial park, comprising: a waste gas collection device, comprising a waste gas collection and delivery pipeline and a plurality of workshop waste gas collection ports connected to the waste gas collection and delivery pipeline, the workshop waste gas collection port is connected to the acid and alkali waste gas generating process of the electroplating enterprise, and the workshop waste gas collection port is provided with a valve system; a waste gas purification device, comprising a chemical washing tower, a circulating water tank, a circulating water pipe and a circulating pump, the air inlet of the chemical washing tower is connected to the waste gas collection and delivery pipeline, the chemical washing tower is provided with a filler and a spray system, one end of the circulating water tank is connected to the chemical washing tower, the other end of the circulating water tank is connected to the circulating water pipe through the circulating pump, and the circulating water pipe is connected to the spray system; a waste gas discharge device, comprising an air duct, a fan and a chimney, the air outlet of the chemical washing tower and the air inlet of the fan are respectively connected to the air duct, and the air outlet of the fan is connected to the chimney.

[0006] Preferably, the centralized exhaust gas treatment system also includes a PLC controller, the valve system includes an electric air valve, a manual air valve and a fire damper, and the PLC controller is communicatively connected with the electric air valve, the fan and the circulation pump respectively.

[0007] Preferably, a check valve, a manual butterfly valve, a Y-type filter, a pressure gauge and a flow meter are provided in the circulating water pipe.

[0008] Preferably, a wire mesh demister is further provided in the chemical scrubbing tower, and the wire mesh demister is located between the filler and the air outlet of the chemical scrubbing tower.

[0009] Preferably, the circulating water tank is provided with a liquid level meter and a PH meter, the exhaust gas purification device also includes a dosing device for automatically adding chemical agents into the circulating water tank, and the PLC controller is communicatively connected with the liquid level meter, PH meter and dosing device respectively.

[0010] Preferably, the circulating water tank is also provided with an electric drain valve and an electric water replenishment valve, and the PLC controller is communicatively connected with the electric drain valve and the electric water replenishment valve respectively.

[0011] Preferably, the exhaust gas purification device includes two fans, the air inlet of each fan is connected to the air duct, the air outlet of each fan is connected to the chimney, and the fans are made of fiberglass.

[0012] Preferably, the exhaust gas emission device further includes a plurality of air duct brackets and a chimney tower, the air ducts are installed and fastened through the air duct brackets, and the chimney is fixedly installed in the chimney tower.

[0013] Preferably, a sampling port is provided on the chimney, and the sampling port is provided with a sensor group for detecting the composition, concentration, gas volume and temperature of the exhaust gas, the sensor group is communicatively connected to the PLC controller, the distance from the sampling port to the air outlet of the fan is L1, and the distance from the sampling port to the emission port of the chimney is L2, L1≥6*d1, L2≥3*d2, wherein d1 represents the outlet diameter of the fan, and d1 represents the emission diameter of the chimney.

[0014] Preferably, the centralized waste gas treatment system also includes an alarm device communicatively connected to the PLC controller. When a failure or abnormal accident occurs in the waste gas purification device, the PLC controller controls the alarm device to sound an alarm and uploads the failure information or abnormal accident information to the factory main control console.

[0015] Preferably, the exhaust gas purification device includes two circulating pumps, one end of the circulating water tank is connected to the chemical washing, and the other end of the circulating water tank is connected to the circulating water pipe through the two circulating pumps.

[0016] The beneficial technical effect of the utility model is that the utility model utilizes a waste gas collection device to centrally collect the acid and alkali waste gas generated by each electroplating enterprise, and then utilizes a chemical absorption tower to absorb and degrade the acid and alkali waste gas, thoroughly purifies the acid and alkali waste gas, and finally utilizes a chimney to discharge the purified qualified gas into the atmosphere, thereby realizing efficient centralized treatment of waste gas in the electroplating environmental protection industrial park, and solving the problem of excessive waste gas emissions in the electroplating environmental protection industrial park; at the same time, the centralized waste gas treatment system has a small number of equipment, a small footprint, and a light weight, which solves the problem that the waste gas treatment equipment in the electroplating environmental protection industrial park is scattered, occupies a large area, and cannot be uniformly and standardizedly managed; finally, the waste gas in the electroplating environmental protection industrial park is centrally treated by the centralized waste gas treatment system, thereby reducing the environmental protection investment of each electroplating enterprise, thereby reducing the investment cost of the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the exhaust gas collection device of the utility model;

[0018] Figure 2 This is a schematic diagram of the structure of the workshop exhaust gas collection port of the utility model;

[0019] Figure 3 A top view of the exhaust gas purification device and the exhaust gas emission device of the utility model;

[0020] Figure 4 It is a side view of the exhaust gas emission device of the present utility model.

[0021] Explanation of the reference numerals: 1-waste gas collection and transportation pipeline; 2-workshop waste gas collection port; 3-manual air valve; 4-electric air valve; 5-fire damper; 6-chemical washing tower; 61-air inlet of the chemical washing tower; 7-circulating water tank; 8-circulating pump; 9-dosing device; 10-air duct; 11-fan; 12-chimney; 13-chimney tower; 14-sampling port; 15-air duct bracket. DETAILED DESCRIPTION

[0022] In order to enable ordinary technicians in the field to more clearly understand the purpose, technical solutions and advantages of the utility model, the utility model is further explained below in conjunction with the accompanying drawings and embodiments.

[0023] The utility model provides a centralized waste gas treatment system suitable for an electroplating environmental protection industrial park.

[0024] like Figure 1-3 As shown, in one embodiment of the utility model, the centralized waste gas treatment system includes a waste gas collection device, a waste gas purification device and a waste gas emission device.

[0025] The waste gas collection device includes a waste gas collection and transportation pipeline 1 and a plurality of workshop waste gas collection ports 2 connected to the waste gas collection and transportation pipeline 1. The workshop waste gas collection ports 2 are connected to the acid and alkali waste gas generating process of the electroplating enterprise. The workshop waste gas collection ports 2 are provided with a valve system.

[0026] The exhaust gas purification device includes a chemical washing tower 6, a circulating water tank 7, a circulating water pipe and a circulating pump 8. The air inlet 61 of the chemical washing tower 6 is connected to the exhaust gas collection and transportation pipeline 1. The chemical washing tower 6 is provided with a filler and a spray system. One end of the circulating water tank 7 is connected to the chemical washing tower 6, and the other end of the circulating water tank 7 is connected to the circulating water pipe through the circulating pump 8. The circulating water pipe is connected to the spray system. A check valve, a manual butterfly valve, a Y-type filter, a pressure gauge and a flow meter are provided in the circulating water pipe.

[0027] The exhaust gas discharge device includes an air duct 10 , a fan 11 and a chimney 12 . The air outlet of the chemical scrubbing tower 6 and the air inlet of the fan 11 are respectively connected to the air duct 10 , and the air outlet of the fan 11 is connected to the chimney 12 .

[0028] The specific steps of using the centralized waste gas treatment system of the utility model to centrally treat the acid and alkali waste gas generated by the enterprises in the electroplating environmental protection industrial park are as follows:

[0029] A1. Use waste gas collection devices to centrally collect the acid and alkali waste gas generated by each electroplating enterprise;

[0030] A2. Use the fan to provide exhaust power for the entire exhaust gas centralized treatment system;

[0031] A3. Use chemical absorption tower to thoroughly absorb and degrade acid and alkali waste gas, and thoroughly purify acid and alkali waste gas;

[0032] A4. Use chimneys to discharge purified gases that meet standards into the atmosphere.

[0033] Among them, in step A1, the valve system of the corresponding workshop waste gas collection port 2 needs to be opened and closed according to the specific production situation of the electroplating enterprise, that is, the valve system of the workshop waste gas collection port 2 corresponding to the electroplating enterprise in production is opened to collect the acid and alkali waste gas generated by the electroplating enterprise in production, and the valve system of the workshop waste gas collection port 2 corresponding to the electroplating enterprise that has stopped production is closed. The acid and alkali waste gas contains harmful substances such as hydrochloric acid mist, sulfuric acid mist, ammonia, nitrogen oxides, fluorides, cyanides, chromic acid mist, etc.

[0034] In step A3, the chemical absorption liquid in the circulating water tank 7 is continuously sprayed onto the filler with a large specific surface area inside the chemical scrubbing tower 6 by the circulating pump 8. At the same time, the chemical absorption liquid inside the chemical scrubbing tower 6 is also continuously circulated into the circulating water tank 7. The chemical agents contained in the chemical absorption liquid are generally sulfuric acid and sodium hydroxide. The acid-base waste gas entering the chemical scrubbing tower 6 fully contacts and reacts with the chemical absorption liquid, and finally produces inorganic salt solutions such as sodium chloride and sodium sulfate. The reaction principle is as follows:

[0035] H2SO4+NH3→NH4HSO4;

[0036] HCl+2NaOH→NaCl+H2O;

[0037] H2SO4+2NaOH→Na SO4+2H2O;

[0038] HCN + NaOH → NaCN + H2O;

[0039] NaCN+NaClO→NaCO3+NaCl+N2;

[0040] K2Cr2O7+3Na2SO3+4H2SO4===Cr2(SO4)3+4H2O+3Na2SO4+K2SO4.

[0041] The valve system installed on the workshop waste gas collection port 2 includes a manual air valve 3, an electric air valve 4 and a fire damper 5, wherein the electric air valve 4 is connected to the PLC controller for communication. The PLC controller controls the opening and closing of the electric air valve 4 of the corresponding workshop waste gas collection port 2 according to the production situation of the electroplating enterprise. If the electroplating enterprise is in production, the electric air valve 4 of the corresponding workshop waste gas collection port 2 is controlled to be opened; if the electroplating enterprise stops production, the electric air valve 4 of the corresponding workshop waste gas collection port 2 is controlled to be closed.

[0042] The PLC controller is also communicatively connected to the fan 11, and the PLC controller adjusts the working efficiency of the fan 11 according to the number of electric air valves 4 opened (the greater the number of electric air valves 4 opened, the greater the working efficiency of the fan 11), thereby achieving energy-saving operation of the fan 11 and reducing energy consumption: the greater the number of electric air valves 4 opened, the greater the working efficiency of the fan 11.

[0043] The exhaust gas collection device is made of PP flame-retardant material, which is flame-retardant and corrosion-resistant, thus solving the problem of safety risks.

[0044] The spray system includes a plurality of spiral nozzles with large flow rates, through which the chemical absorption liquid is continuously sprayed onto the filler with a large specific surface area inside the chemical washing tower 6, thereby increasing the contact area between the acid-base waste gas and the chemical absorption liquid, and ensuring that the acid-base waste gas and the chemical absorption liquid are fully contacted and reacted. In order to ensure continuous and efficient purification of the acid-base waste gas, the chemical absorption liquid needs to be replaced regularly to avoid the accumulation of too many inorganic salts and other impurities, which will affect the purification effect. The replacement cycle of the chemical absorption liquid is generally no more than 5 days, for example, 3 days or 4 days.

[0045] A wire mesh demister is also provided in the chemical scrubber 6, and the wire mesh demister is located between the filler and the air outlet of the chemical scrubber 6. After the acid and alkali waste gas reacts with the chemical absorption liquid, it is defogged by the wire mesh demister and then discharged into the atmosphere through the fan 11, which can avoid the chemical absorption liquid being sprayed into the atmosphere and near the equipment installation area to cause environmental pollution and unnecessary consumption of reagents.

[0046] The wire mesh demister and spiral nozzle are made of PP flame-retardant material, which is flame-retardant and corrosion-resistant, thus solving the problem of safety risks.

[0047] The centralized waste gas treatment device also includes a dosing device 9 for automatically adding chemical agents into the circulating water tank. The circulating water tank 7 is provided with a PH meter, which is used to monitor the PH value of the chemical absorption liquid in the circulating water tank 7 and feed back to the PLC controller. The PLC controller controls the amount of chemical agents added to the circulating water tank by the dosing device 9 according to the PH value of the chemical absorption liquid.

[0048] The circulating water tank 7 is also provided with a liquid level meter, an electric drain valve and an electric water supply valve, and the PLC controller is respectively connected to the circulating pump 8, the liquid level meter, the electric drain valve and the electric water supply valve for communication. The PLC controller controls the electric water supply valve to automatically supply water or controls the electric drain valve to automatically drain water according to the data displayed by the liquid level meter; the PLC controller controls the circulating pump 8 to stop working when the liquid level is low, so as to realize low liquid level protection.

[0049] The exhaust gas purification device includes two circulating pumps 8, one end of the circulating water tank 7 is connected to the chemical scrubber 6, and the other end of the circulating water tank 7 is connected to the circulating water pipe through the two circulating pumps 8. One of the two circulating pumps 8 works normally, and the other is reserved for standby, and is automatically switched according to the operating conditions of the circulating pump 8.

[0050] The centralized waste gas treatment device includes two fans 11, the air inlet of each fan 11 is connected to the air duct 10, and the air outlet of each fan 11 is connected to the chimney 12. When working, one fan 11 works to provide exhaust kinetic energy, and the other fan 11 is on standby, ensuring that exhaust power can be provided 24 hours a day to achieve sustainable production of electroplating enterprises.

[0051] The fan 11 is made of glass fiber reinforced plastic, which is corrosion-resistant and solves the problem of safety risks.

[0052] The exhaust gas discharge device further includes a plurality of air duct brackets 15 and a chimney tower 13. The air duct 10 is installed and fastened through the air duct brackets 15, and the chimney 12 is fixedly installed in the chimney tower 13, which can ensure stability under any circumstances.

[0053] The chimney 12 is provided with a sampling port 14, and the distance from the sampling port 14 to the air outlet of the fan 11 is L1, and the distance from the sampling port 14 to the discharge port of the chimney 12 is L2, L1≥6*d1, L2≥3*d2, wherein d1 represents the diameter of the air outlet of the fan 11, and d2 represents the diameter of the discharge port 121 of the chimney 12. The sampling port 14 is provided with a sensor group for detecting the composition, concentration, gas volume and temperature of the exhaust gas, and the sensor group is communicatively connected with the PLC controller. The PLC controller can control the dosage of the dosing device 9, the operating power of the fan 11 and other parameters according to the composition, concentration, gas volume and temperature of the exhaust gas, so as to realize the automatic regulation and control of the centralized exhaust gas treatment system to achieve the best purification treatment effect.

[0054] The centralized waste gas treatment system also includes an alarm device that is communicatively connected to the PLC controller. When a failure or abnormal accident occurs in the waste gas purification device, the PLC controller controls the alarm device to sound an alarm and uploads the failure information or abnormal accident information to the factory main control console.

[0055] The beneficial effects of the utility model are:

[0056] (1) The waste gas collection device is used to centrally collect the acid and alkali waste gas generated by each electroplating enterprise, and then the acid and alkali waste gas is absorbed and degraded by a chemical absorption tower to completely purify the acid and alkali waste gas. Finally, the purified waste gas is discharged into the atmosphere through a chimney, thus realizing efficient centralized treatment of waste gas in the electroplating environmental protection industrial park and solving the problem of excessive waste gas emissions in the electroplating environmental protection industrial park;

[0057] (2) The acid and alkali waste gas purification efficiency is high, which can reach more than 99%;

[0058] (3) The centralized waste gas treatment system has a small number of equipment, small footprint, and light weight, which solves the problem of scattered distribution, large footprint, and inability to conduct unified and standardized management of waste gas treatment equipment in the electroplating environmental protection industrial park;

[0059] (4) The waste gas from the electroplating environmental protection industrial park is centrally treated through the waste gas centralized treatment system, which reduces the environmental protection investment of each electroplating enterprise, thereby reducing the investment cost of the enterprise;

[0060] (5) The centralized waste gas treatment system is made of high-quality anti-corrosion materials, which are flame retardant and corrosion-resistant, thus solving the safety risk problem;

[0061] (6) A dosing device 9 is provided, which can automatically add chemical agents into the circulating water tank, and can control the amount of chemical agents added into the circulating water tank by the dosing device 9 according to the pH value of the chemical absorption liquid, thereby realizing automatic dosing, highly intelligent operation, and reducing human operation.

[0062] (7) The PLC controller can control the dosage of the dosing device 9, the operating power of the fan 11 and other parameters according to the composition, concentration, gas volume and temperature of the exhaust gas, so as to realize automatic regulation of the centralized exhaust gas treatment system to achieve the best purification treatment effect.

[0063] (8) An alarm device is included. When a fault or abnormal accident occurs in the exhaust gas purification device, the PLC controller controls the alarm device to sound an alarm and uploads the fault information or abnormal accident information to the factory main control station, thereby realizing online monitoring with the factory main control station. There is no need for dedicated personnel to be on duty, saving labor costs.

[0064] The above description is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Those skilled in the art can make various equivalent changes and improvements based on the above embodiments, and all equivalent changes or modifications made within the scope of the claims should fall within the protection scope of the utility model.

Claims

1. A centralized waste gas treatment system suitable for an electroplating environmental protection industrial park, characterized in that: The centralized waste gas treatment system comprises: An exhaust gas collection device, comprising an exhaust gas collection and delivery pipeline and a plurality of workshop exhaust gas collection ports connected to the exhaust gas collection and delivery pipeline, wherein the workshop exhaust gas collection ports are connected to the acid and alkali exhaust gas generation process of the electroplating enterprise, and the workshop exhaust gas collection ports are provided with a valve system; An exhaust gas purification device, comprising a chemical scrubber, a circulating water tank, a circulating water pipe and a circulating pump, wherein the air inlet of the chemical scrubber is connected to the exhaust gas collection and delivery pipeline, the chemical scrubber is provided with a filler and a spray system, one end of the circulating water tank is connected to the chemical scrubber, the other end of the circulating water tank is connected to the circulating water pipe through the circulating pump, and the circulating water pipe is connected to the spray system; The waste gas discharge device comprises an air duct, a fan and a chimney. The air outlet of the chemical scrubbing tower and the air inlet of the fan are respectively connected to the air duct, and the air outlet of the fan is connected to the chimney.

2. The centralized waste gas treatment system according to claim 1, characterized in that: The centralized waste gas treatment system also includes a PLC controller, the valve system includes an electric air valve, a manual air valve and a fire damper, and the PLC controller is communicatively connected with the electric air valve, the fan and the circulation pump respectively.

3. The centralized waste gas treatment system according to claim 2, characterized in that: The circulating water pipe is provided with a check valve, a manual butterfly valve, a Y-type filter, a pressure gauge and a flow meter.

4. The centralized waste gas treatment system according to claim 2, characterized in that: A wire mesh demister is also provided in the chemical scrubbing tower, and the wire mesh demister is located between the filler and the air outlet of the chemical scrubbing tower.

5. The centralized waste gas treatment system according to claim 2, characterized in that: The circulating water tank is provided with a liquid level meter and a PH meter. The exhaust gas purification device also includes a dosing device for automatically adding chemical agents into the circulating water tank. The PLC controller is communicatively connected with the liquid level meter, the PH meter and the dosing device respectively.

6. The centralized waste gas treatment system according to claim 5, characterized in that: The circulating water tank is also provided with an electric drain valve and an electric water replenishment valve, and the PLC controller is communicatively connected with the electric drain valve and the electric water replenishment valve respectively.

7. The centralized waste gas treatment system according to claim 2, characterized in that: The exhaust gas purification device includes two fans, the air inlet of each fan is connected to the air duct, the air outlet of each fan is connected to the chimney, and the fans are made of glass fiber reinforced plastics.

8. The centralized waste gas treatment system according to claim 2, characterized in that: The exhaust gas discharge device also includes a plurality of air duct brackets and a chimney tower. The air ducts are installed and fastened through the air duct brackets, and the chimney is fixedly installed in the chimney tower.

9. The centralized waste gas treatment system according to claim 8, characterized in that: The chimney is provided with a sampling port, and the sampling port is provided with a sensor group for detecting the composition, concentration, gas volume and temperature of the exhaust gas. The sensor group is communicatively connected with the PLC controller. The distance from the sampling port to the air outlet of the fan is L1, and the distance from the sampling port to the exhaust port of the chimney is L2. L1≥6*d1, L2≥3*d2, wherein d1 represents the outlet diameter of the fan, and d1 represents the exhaust port diameter of the chimney.

10. The centralized waste gas treatment system according to claim 9, characterized in that: The centralized waste gas treatment system also includes an alarm device that is communicatively connected to the PLC controller. When a failure or abnormal accident occurs in the waste gas purification device, the PLC controller controls the alarm device to sound an alarm and uploads the failure information or abnormal accident information to the factory main control console.

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