A treatment method and system for wastewater containing methyldiethanolamine

Abstract

The present invention relates to the field of wastewater treatment, and particularly to a method and system for treating wastewater containing methyldiethanolamine. A method for treating wastewater containing methyldiethanolamine provided by the present invention comprises the following steps: 1) filtering the wastewater containing methyldiethanolamine, and subjecting the filtrate to thermal cracking to obtain a thermal cracking gas; 2) mixing the thermal cracking gas with raw coal gas and then successively carrying out purification treatment through ammonia water spraying, water spraying and electrocatalytic tar removal to obtain purified coal gas. The method for treating wastewater containing methyldiethanolamine provided by the present invention can simply and efficiently treat the wastewater containing methyldiethanolamine, and can fully utilize its effective components, and convert it into purified coal gas after purification.

Description

Technical Field

[0001] The present invention relates to the field of wastewater treatment, and particularly to a method and a system for treating wastewater containing methyldiethanolamine. Background Art

[0002] N-methyldiethanolamine (MDEA) is a tertiary amine substance and a common desulfurizer, which is widely used in fields such as natural gas desulfurization, coal gasification desulfurization, and refinery gas desulfurization. MDEA is stable in nature, highly soluble in water, not easily absorbed, difficult to biodegrade, and has a certain toxicity to microorganisms. Wastewater containing MDEA has characteristics such as strong alkalinity and high chemical oxygen demand (COD) content, and it is difficult to treat using conventional wastewater treatment technologies such as adsorption, oxidation, flocculation, and biological methods.

[0003] In the prior art, MDEA wastewater treatment technologies mainly include enhanced biodegradation technology, advanced oxidation technology, and combinations of the two processes. However, enhanced biodegradation technology is mostly anaerobic biological treatment technology. This technology not only requires long-term anaerobic microorganism domestication to adapt to the quality of MDEA wastewater, but also has limited treatment efficiency and long treatment cycles, and is not suitable for large-scale development.

[0004] Advanced oxidation technology is a process of oxidizing and degrading refractory organic matter in MDEA wastewater into easily biodegradable small molecule organic matter or CO2 and water by using free radicals (such as hydroxyl radical -OH) with strong oxidizing property and no selectivity generated under different conditions. The above methods all have problems such as large dosage of chemicals and low oxidation efficiency.

[0005] In addition, the combination of advanced oxidation technology and biology is also a common means for treating MDEA wastewater. This process uses advanced oxidation technology as a pretreatment means to improve the biodegradability of MDEA wastewater, and mainly realizes the degradation of organic matter through the biological degradation unit. However, this process flow is long, inconvenient for management and operation, and complex in operation.

[0006] In summary, the prior art for treating wastewater containing methyldiethanolamine has a relatively complex process, low treatment efficiency, and cannot make full use of its effective components. Summary of the Invention

[0007] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the existing process for treating wastewater containing methyldiethanolamine, which is relatively complex, has low treatment efficiency, and cannot make full use of its effective components, so as to provide a method and a system for treating wastewater containing methyldiethanolamine.

[0008] The present invention provides a method for treating wastewater containing methyldiethanolamine, comprising the following steps:

[0009] 1) Filter the wastewater containing methyldiethanolamine, and pyrolyze the filtrate to obtain pyrolysis gas;

[0010] 2) The pyrolysis gas and raw gas are mixed and then successively purified through ammonia water spraying, water spraying, and electrocatalytic tar removal to obtain purified gas.

[0011] The thermal cracking reaction of methyldiethanolamine is as follows:

[0012] C5H 13 NO2 → H2 + CH3OH + NH3 + CO + CO2 + CH4 + other components. The other components refer to ethane, ethylene, and a small amount of propylene, propane, butene, etc.

[0013] Preferably, the filter screen aperture of the filter used in the filtration step in step 1) is 5 μm - 10 μm.

[0014] Preferably, the pyrolysis temperature is 650°C - 900°C, and the pyrolysis pressure is 80 KPa - 110 KPa; optionally, the pyrolysis temperature is 700°C - 800°C, and the pyrolysis pressure is 80 KPa - 90 KPa

[0015] Preferably, the concentration of methyldiethanolamine in the waste water containing methyldiethanolamine is 5 wt% - 25 wt%.

[0016] Preferably, the concentration of the ammonia water in step 2) is 0.05 wt% - 0.5 wt%, and the temperature is 50°C - 100°C; the temperature of the water is 50 - 100°C; the voltage of the electrocatalytic tar remover is 5000 V - 15000 V, and the current is 10 A - 30 A.

[0017] Optionally, the concentration of the ammonia water in step 2) is 0.05 wt% - 0.3 wt%, and the temperature is 50°C - 80°C; the temperature of the water is 50°C - 80°C; the voltage of the electrocatalytic tar remover is 8000 V - 15000 V, and the current is 10 A - 25 A.

[0018] Preferably, the volume ratio of the pyrolysis gas to the raw gas is 1 - 2000:1 - 3000;

[0019] Optionally, the volume ratio of the pyrolysis gas to the raw gas is 1 - 2000:1 - 2600.

[0020] The raw gas components in the present invention are conventional raw gas components in the art, which can be generated by the pyrolysis of coal in a carbonization furnace. Its effective components include: 10% - 15% carbon monoxide, 25% - 30% hydrogen, 5% - 10% methane; in addition, it also contains 10% - 15% carbon dioxide, 40% - 48% nitrogen, and trace amounts of ethylene, ethane, oxygen and other gases.

[0021] The present invention also provides a treatment system for waste water containing methyldiethanolamine, including: a filtration device, a carbonization furnace, an ammonia water spraying system, a water spraying system, and an electrocatalytic tar remover;

[0022] The carbonization furnace includes a thermal cracking section and a raw gas generation section; the liquid outlet of the filtering device is connected to the liquid inlet of the thermal cracking section; the gas outlet of the thermal cracking section and the gas outlet of the raw gas generation section are connected to the gas inlet of the ammonia water spraying system; the gas outlet of the ammonia water spraying system is connected to the gas inlet of the water spraying system; the gas outlet of the water spraying system is connected to the gas inlet of the electrocatcher.

[0023] Preferably, the filtering device is a filter, and the mesh aperture of the filter screen is 5 μm - 10 μm.

[0024] Preferably, the filter also has an impurity discharge port.

[0025] Preferably, the ammonia water spraying system includes an ammonia water storage tank, an ammonia water spraying device, and a sprayed ammonia water waste recovery tank; the liquid outlet of the ammonia water storage tank is connected to the liquid inlet of the ammonia water spraying device, and the liquid outlet of the ammonia water spraying device is connected to the liquid inlet of the sprayed ammonia water waste recovery tank;

[0026] The gas inlet of the ammonia water spraying device is connected to the gas outlet of the thermal cracking section and the gas outlet of the raw gas generation section;

[0027] The water spraying system includes a water storage tank, a water spraying device, and a sprayed wastewater recovery tank; the liquid outlet of the water storage tank is connected to the liquid inlet of the water spraying device, and the liquid outlet of the water spraying device is connected to the liquid inlet of the wastewater recovery tank;

[0028] The gas inlet of the water spraying device is connected to the gas outlet of the ammonia water spraying device;

[0029] The gas outlet of the water spraying device is connected to the gas inlet of the electrocatcher;

[0030] Preferably, the ammonia water storage tank also has an ammonia water heating device and an ammonia water temperature detection device;

[0031] Preferably, the water storage tank also has a water heating device and a water temperature detection device.

[0032] Preferably, the ammonia water heating device is a resistance wire heater;

[0033] Preferably, the water heating device is a resistance wire heater;

[0034] Preferably, the ammonia water temperature detection device is a thermocouple temperature sensor;

[0035] Preferably, the water temperature detection device is a thermocouple temperature sensor.

[0036] The technical solution of the present invention has the following advantages:

[0037] 1. The present invention provides a method for treating wastewater containing methyldiethanolamine, comprising the following steps:

[0038] 1) Filter the wastewater containing methyldiethanolamine, and subject the filtrate to thermal cracking to obtain thermal cracking gas; 2) Mix the thermal cracking gas and raw coal gas, and then successively carry out purification treatment through ammonia water spraying, water spraying and electrocatalytic tar removal to obtain purified coal gas.

[0039] In the present invention, through the thermal cracking reaction, the methyldiethanolamine in the wastewater containing methyldiethanolamine can be thermally cracked into hydrogen, methanol, methane, ammonia, carbon monoxide, ethane, ethylene, propylene, propane and butene in one step; ammonia water and water can separate some tar and gases soluble in ammonia water and water in the gas generated by the thermal cracking of methyldiethanolamine and raw coal gas, and the electrocatalytic tar remover can capture the tar in the raw coal gas. The cracking rate of the wastewater containing methyldiethanolamine is relatively fast, and the subsequent treatment process is a cooling, absorption and adsorption process, and the process is relatively simple. In summary, the method for treating the wastewater containing methyldiethanolamine can simply and efficiently treat the wastewater containing methyldiethanolamine, and can make full use of its effective components, and convert it into purified coal gas after purification.

[0040] At the same time, in the process of treating the wastewater containing methyldiethanolamine in the present invention, the raw coal gas is treated together, and the raw coal gas is subjected to purification treatment through ammonia water spraying, water spraying and electrocatalytic tar removal together. While treating the wastewater containing methyldiethanolamine, the raw coal gas is purified to obtain purified coal gas, which improves the production efficiency of purified coal gas while saving costs.

[0041] 2. The treatment system for wastewater containing methyldiethanolamine provided by the present invention comprises the following steps: a filtration device, a carbonization furnace, an ammonia water spraying system, a water spraying system, and an electrostatic tar precipitator; the carbonization furnace includes a thermal cracking section and a raw gas generating section; the liquid outlet of the filtration device is connected to the liquid inlet of the thermal cracking section; the gas outlet of the thermal cracking section and the gas outlet of the raw gas generating section are connected to the gas inlet of the ammonia water spraying system; the gas outlet of the ammonia water spraying system is connected to the gas inlet of the water spraying system; the gas outlet of the water spraying system is connected to the gas inlet of the electrostatic tar precipitator. After the wastewater containing methyldiethanolamine is filtered by the filtration device, the thermal cracking section of the carbonization furnace can thermally crack methyldiethanolamine in the wastewater into hydrogen, methanol, methane, ammonia, carbon monoxide, ethane, ethylene, propylene, propane, and butene in one step; meanwhile, the raw gas generated by the raw gas generating section and the thermal cracking gas generated by the thermal cracking section are introduced into the ammonia water spraying system, the water spraying system, and the electrostatic tar precipitator together; the ammonia water spraying system and the water spraying system can separate part of the tar and the gases soluble in ammonia water and water in the gas generated by the thermal cracking of methyldiethanolamine and the raw gas, and the electrostatic tar precipitator can capture the remaining tar in the raw gas. The thermal cracking rate of the wastewater containing methyldiethanolamine in the carbonization furnace is relatively fast, and the subsequent treatment process is an absorption and adsorption reaction, and the process is relatively simple. In summary, the treatment system for the wastewater containing methyldiethanolamine can simply and efficiently treat the wastewater containing methyldiethanolamine, and can make full use of its effective components, and after purification, it is converted into purified gas.

[0042] 3. Further, the treatment method of the present invention recovers ammonia, methanol in the gas generated by the cracking reaction and coal tar in the raw gas through spraying ammonia water, spraying water, and a direct current electric field, which can further reduce the treatment cost of the wastewater containing methyldiethanolamine. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0044] Figure 1 is the treatment system for the wastewater containing methyldiethanolamine in Embodiment 1 of the present invention;

[0045] Figure 2 is the schematic diagram of the ammonia water spraying system in Embodiment 1 of the present invention;

[0046] Figure 3 is the schematic diagram of the water spraying system in Embodiment 1 of the present invention.

[0047] Reference numerals:

[0048] 100 - Filter device; 200 - Carbonization furnace; 300 - Ammonia water spraying system; 400 - Water spraying system; 500 - Electrostatic tar precipitator; 301 - Ammonia water spraying device, 302 - Ammonia water storage tank, 303 - Sprayed ammonia water wastewater recovery tank; 401 - Water spraying device, 402 - Water storage tank, 403 - Sprayed wastewater recovery tank. Detailed implementation manners

[0049] The following embodiments are provided to better understand the present invention further, and are not limited to the best implementation manners, and do not constitute limitations on the content and protection scope of the present invention. Any product identical or similar to the present invention obtained by anyone under the inspiration of the present invention or by combining the features of the present invention with those of other prior arts falls within the protection scope of the present invention.

[0050] For those not specifying specific experimental steps or conditions in the embodiments, the operations or conditions of the conventional experimental steps described in the literature in this field can be followed. For the reagents or instruments not specifying the manufacturers, they are all conventional reagent products that can be obtained through commercial purchase.

[0051] Embodiment 1

[0052] This embodiment provides a treatment system for wastewater containing methyldiethanolamine. Refer to Figure 1 , including: a filter device 100, a carbonization furnace 200, an ammonia water spraying system 300, a water spraying system 400, and an electrostatic tar precipitator 500; the carbonization furnace 200 includes a pyrolysis section 201 and a raw gas generation section 202; the liquid outlet of the filter device 100 is connected to the liquid inlet of the pyrolysis section 201; the gas outlet of the pyrolysis section 201 and the gas outlet of the raw gas generation section 202 are connected to the gas inlet of the ammonia water spraying system 300; the gas outlet of the ammonia water spraying system 300 is connected to the gas inlet of the water spraying system 400; the gas outlet of the water spraying system 400 is connected to the gas inlet of the electrostatic tar precipitator 500.

[0053] After the wastewater containing methyldiethanolamine is filtered by the filtration device 100, the pyrolysis section 201 of the carbonization furnace 200 can directly pyrolyze methyldiethanolamine in the wastewater into hydrogen, methanol, methane, ammonia, carbon monoxide, ethane, ethylene, propylene, propane, and butene in one step. Meanwhile, the raw gas generated by the raw gas generation section 202 and the pyrolysis gas generated by the pyrolysis section are introduced into the ammonia water spraying system 300, the water spraying system 400, and the electrostatic tar precipitator 500 together. The ammonia water spraying system 300 and the water spraying system 400 can separate part of the tar and the gases soluble in ammonia water and water in the gas generated by the pyrolysis of methyldiethanolamine and the raw gas, and the electrostatic tar precipitator 500 can capture the remaining tar in the raw gas. The gas discharged from the treatment system of the wastewater containing methyldiethanolamine can be used downstream to produce hydrogen or as fuel. The pyrolysis rate of the wastewater containing methyldiethanolamine in the pyrolysis section 201 is relatively fast, and the subsequent treatment process is a cooling, absorption, and adsorption process, which is relatively simple. In summary, the treatment system for the wastewater containing methyldiethanolamine can simply and efficiently treat the wastewater containing methyldiethanolamine.

[0054] In this embodiment, the pyrolysis section 201 can provide a pyrolysis reaction temperature of 650°C - 900°C, for example: 650°C, 700°C, 800°C, or 900°C; in this embodiment, the pyrolysis section 201 can provide a pyrolysis reaction pressure of 80 KPa - 110 KPa, for example: 80 KPa, 90 KPa, 100 KPa, or 110 KPa.

[0055] In this embodiment, the filtration device 100 is a filter, and the mesh aperture of the filter is 5 μm - 10 μm, for example: 5 μm, 6 μm, 7 μm, or 10 μm. If the mesh aperture is greater than 10 μm, the insoluble solids in the wastewater containing methyldiethanolamine are likely to precipitate and block the subsequent treatment system; if the mesh aperture is less than 5 μm, the filter itself is likely to be blocked. In other embodiments, the filtration device 100 can be other filtration devices.

[0056] In this embodiment, the filter further has an impurity discharge port. The impurity discharge port can discharge the filtered insoluble substances from the filter mesh to avoid blocking the filter mesh of the filter.

[0057] In this embodiment, the ammonia water spraying system 300, as Figure 2 shown: includes an ammonia water storage tank 302, an ammonia water spraying device 301, and a sprayed ammonia water wastewater recovery tank 303; the liquid outlet of the ammonia water storage tank 302 is connected to the liquid inlet of the ammonia water spraying device 301, and the liquid outlet of the ammonia water spraying device 301 is connected to the liquid inlet of the sprayed ammonia water wastewater recovery tank 303.

[0058] In this embodiment, the gas inlet of the ammonia water spraying device 301 is connected to the gas outlet of the pyrolysis section 201 and the gas outlet of the raw gas generation section 202.

[0059] The ammonia water storage tank 302 also has an ammonia water heating device and an ammonia water temperature detection device. The ammonia water heating device can heat the ammonia water in the ammonia water storage tank 302, and raising the temperature of the ammonia water can increase the absorption rate of the ammonia water for the pyrolysis gas of methyldiethanolamine and the soluble gas in the raw coal gas; the ammonia water temperature detection device detects the temperature of the ammonia water in the ammonia water storage tank 302.

[0060] In this embodiment, the ammonia water heating device is a resistance wire heater, and the ammonia water temperature detection device is a thermocouple temperature sensor.

[0061] In this embodiment, the concentration of the ammonia water is 0.05 wt% - 0.3 wt%, for example: 0.05 wt%, 0.1 wt%, 0.2 wt% or 0.3 wt%; the temperature of the ammonia water is 50°C - 100°C, for example: 50°C, 60°C, 70°C or 80°C.

[0062] In this embodiment, the water spray system 400, as Figure 3 shown, includes a water storage tank 402, a water spray device 401, and a spray waste water recovery tank 403; the liquid outlet of the water storage tank 402 is connected to the liquid inlet of the water spray device 401, and the liquid outlet of the water spray device 401 is connected to the liquid inlet of the spray waste water recovery tank 403.

[0063] In this embodiment, the air inlet of the water spray device 401 is connected to the air outlet of the ammonia water spray device 301; the air outlet of the water spray device 401 is connected to the air inlet of the electric tar precipitator 500.

[0064] The water storage tank 402 also has a water heating device and a water temperature detection device. The water heating device can heat the water in the water storage tank 402, and the temperature detection device can detect the temperature of the water in the water storage tank 402.

[0065] In this embodiment, the water heating device is a resistance wire heater, and the water temperature detection device is a thermocouple temperature sensor.

[0066] In this embodiment, the temperature of the water is 50°C - 100°C, for example: 50°C, 60°C, 70°C or 80°C.

[0067] In this embodiment, the waste liquid in the spray ammonia water recovery tank 303 and the spray waste water recovery tank 403 enriches tar and ammonia, and useful substances can be further utilized through other processes.

[0068] In this embodiment, the electric tar precipitator 500 can adsorb the tar in the pyrolysis gas of methyldiethanolamine and the raw coal gas, so that the gas passing through the air outlet of the electric tar precipitator 500 can be directly used downstream for hydrogen production or as fuel.

[0069] In this embodiment, the voltage of the electrostatic tar precipitator is 5000V - 15000V, for example: 5000V, 7000V, 10000V or 14000V; the current is 10A - 30A, for example: 10A, 15A, 20A or 25A.

[0070] Example 2

[0071] This embodiment provides a method for treating wastewater containing methyldiethanolamine. The treatment method uses the wastewater treatment system for methyldiethanolamine provided in Example 1. The specific steps are as follows:

[0072] 0.4t / h of wastewater containing methyldiethanolamine (where the concentration of methyldiethanolamine is 10wt%) is filtered through a filter (the filter mesh aperture is 10μm), and then introduced into the high-temperature part of the carbonization furnace for thermal cracking reaction at 750°C and 85KPa. After that, the gas generated by the thermal cracking reaction and the raw gas are mixed at a volume ratio of 1:3000 and then sequentially pass through ammonia water spraying, water spraying and electrostatic tar precipitation to obtain purified gas. The concentration of ammonia water in the ammonia water spraying is 0.1wt%, the temperature of the ammonia water is 60°C, the temperature of the water in the water spraying is 60°C, and the voltage of the electrostatic tar precipitator is 12000V and the current is 20A.

[0073] Example 3

[0074] This embodiment provides a method for treating wastewater containing methyldiethanolamine. The treatment method uses the wastewater treatment system for methyldiethanolamine provided in Example 1. The specific steps are as follows:

[0075] 0.4t / h of wastewater containing methyldiethanolamine (where the concentration of methyldiethanolamine is 15wt%) is filtered through a filter (the filter mesh aperture is 5μm), and then introduced into the high-temperature part of the carbonization furnace for thermal cracking reaction at 760°C and 88KPa. After that, the gas generated by the thermal cracking reaction and the raw gas are mixed at a volume ratio of 1:2000 and then sequentially pass through ammonia water spraying, water spraying and electrostatic tar precipitation to obtain purified gas. The concentration of ammonia water in the ammonia water spraying is 0.2wt%, the temperature of the ammonia water is 70°C, the temperature of the water in the water spraying is 70°C, and the voltage of the electrostatic tar precipitator is 8000V and the current is 25A.

[0076] The treatment method provided by the present invention pyrolyzes the wastewater containing methyldiethanolamine by high-temperature pyrolysis method. Compared with conventional wastewater treatment technologies such as adsorption method, oxidation method, flocculation method, and biological method, it has the advantages of simple process, high-efficiency treatment of wastewater containing methyldiethanolamine, and no generation of secondary pollutants.

[0077] Obviously, the above embodiments are merely examples for clear illustration and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom still fall within the protection scope of the present invention.

Claims

1. A treatment method for wastewater containing methyldiethanolamine, characterized in that, It includes the following steps: 1) Filter the wastewater containing methyldiethanolamine, and pyrolyze the filtrate to obtain pyrolysis gas; 2) Mix the pyrolysis gas and raw coal gas, and then successively carry out purification treatment through ammonia water spraying, water spraying and electrocatalytic tar removal to obtain purified coal gas.

2. The treatment method for wastewater containing methyldiethanolamine according to claim 1, characterized in that, In step 1), the filter screen aperture of the filter used in the filtering step is 5μm - 10μm.

3. The treatment method for wastewater containing methyldiethanolamine according to claim 1 or 2, characterized in that, The pyrolysis temperature is 650°C - 900°C, and the pyrolysis pressure is 80KPa - 110KPa.

4. The treatment method for wastewater containing methyldiethanolamine according to claim 1, characterized in that, The concentration of methyldiethanolamine in the wastewater containing methyldiethanolamine is 5wt% - 25wt%.

5. The treatment method for wastewater containing methyldiethanolamine according to claim 1, characterized in that, In step 2), the concentration of the ammonia water is 0.05wt% - 0.5wt%, and the temperature is 50°C - 100°C; the temperature of the water is 50°C - 100°C; the voltage of the electrocatalytic tar remover is 5000V - 15000V, and the current is 10A - 30A.

6. The treatment method for wastewater containing methyldiethanolamine according to claim 1, characterized in that, The volume ratio of the pyrolysis gas to the raw coal gas is 1:2000 - 1:3000.

7. A treatment system for wastewater containing methyldiethanolamine, characterized in that, It includes: A filtering device, a carbonization furnace, an ammonia water spraying system, a water spraying system and an electrocatalytic tar remover; The carbonization furnace includes a pyrolysis part and a raw coal gas generation part; the liquid outlet of the filtering device is connected to the liquid inlet of the pyrolysis part; the gas outlet of the pyrolysis part and the gas outlet of the raw coal gas generation part are connected to the gas inlet of the ammonia water spraying system; the gas outlet of the ammonia water spraying system is connected to the gas inlet of the water spraying system; the gas outlet of the water spraying system is connected to the gas inlet of the electrocatalytic tar remover.

8. The treatment system for wastewater containing methyldiethanolamine according to claim 7, characterized in that, The filtering device is a filter, and the filter screen aperture of the filter is 5μm - 10μm.

9. The treatment system for wastewater containing methyldiethanolamine according to claim 8, characterized in that, The filter also has an impurity discharge port.

10. The treatment system for wastewater containing methyldiethanolamine according to claim 7, characterized in that, The ammonia water spraying system includes an ammonia water storage tank, an ammonia water spraying device, and a sprayed ammonia water wastewater recovery tank; the liquid outlet of the ammonia water storage tank is connected to the liquid inlet of the ammonia water spraying device, and the liquid outlet of the ammonia water spraying device is connected to the liquid inlet of the sprayed ammonia water wastewater recovery tank; The gas inlet of the ammonia water spraying device is connected to the gas outlet of the pyrolysis part and the gas outlet of the raw coal gas generation part; The water spraying system includes a water storage tank, a water spraying device, and a sprayed wastewater recovery tank; the liquid outlet of the water storage tank is connected to the liquid inlet of the water spraying device, and the liquid outlet of the water spraying device is connected to the liquid inlet of the wastewater recovery tank; The gas inlet of the water spraying device is connected to the gas outlet of the ammonia water spraying device; The gas outlet of the water spraying device is connected to the gas inlet of the electrocatalytic tar remover.

11. The treatment system for wastewater containing methyldiethanolamine according to claim 10, characterized in that, The ammonia water storage tank also has an ammonia water heating device and an ammonia water temperature detection device.

12. The treatment system for wastewater containing methyldiethanolamine according to claim 10, characterized in that, The water storage tank also has a water heating device and a water temperature detection device.

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