System and method for treating gasified water

Abstract

The invention relates to the technical field of wastewater treatment, and discloses a treatment system and method for gasified water. The gasified water treatment system comprises a first conveying pipeline, a first dosing system, a sedimentation dehydration system, a second conveying pipeline, a second dosing system and a recovery storage tank, the first dosing system is arranged on the first conveying pipeline and is used for injecting an alkaline agent, a silicon removal agent, a hardness removal agent and a flocculating agent into the first conveying pipeline; the settling dehydration system comprises a settling tank and a sludge scraper arranged in the settling tank, the outlet end of the first conveying pipeline is communicated with the settling tank, and a sludge discharge port is formed in the bottom of the settling tank; the inlet end of the second conveying pipeline is communicated with the top of the settling tank and used for discharging clear water on the upper portion of the settling tank, and the outlet end of the second conveying pipeline is communicated with the recycling storage tank; and the second dosing system is used for adding an acid agent and a scale inhibition dispersant into the second conveying pipeline. The device can improve the quality of the gasified water, so that the gasified water can be reused in a gasification system.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment, and in particular to a system and method for treating gasified water. Background Art

[0002] As the leading technology of the coal chemical industry, the operation of coal gasification has a significant impact on the operating efficiency of the entire upstream and downstream systems. At present, scaling and blockage of pipelines and equipment on coal gasification devices have become important factors affecting the long-term stable operation of the devices. At the same time, the poor quality of black water increases the water consumption of the system, thereby bringing higher operating costs.

[0003] In view of this, the present invention is proposed. Summary of the invention

[0004] The object of the present invention is to provide a gasification water treatment system and method, which can reduce the solid content and suspended matter content of gasification water, while reducing the content of scaling ions such as silicon, calcium, and magnesium in the water, softening the water quality, and reducing the alkalinity and hardness of the water, which plays an important role in improving the water quality conditions of the water system of the coal gasification device and improving the stability of the operation of the gasification device.

[0005] The present invention is achieved in that:

[0006] In a first aspect, the present invention provides a gasified water treatment system, comprising:

[0007] A first delivery pipeline, a first dosing system, a sedimentation and dehydration system, a second delivery pipeline, a second dosing system, and a recovery tank;

[0008] The first delivery pipeline is used to deliver the vaporized water to the sedimentation and dehydration system, and the first dosing system is arranged on the first delivery pipeline to inject an alkali agent, a silicon removal agent, a hardness removal agent and a flocculant into the first delivery pipeline;

[0009] The sedimentation and dewatering system includes a sedimentation tank and a sludge scraper arranged in the sedimentation tank. The outlet end of the first conveying pipeline is connected to the sedimentation tank. A sludge discharge port is arranged at the bottom of the sedimentation tank. The sludge scraper is used to scrape the sludge in the sedimentation tank to the bottom of the tank.

[0010] The inlet end of the second delivery pipeline is connected to the top of the sedimentation tank for discharging clean water from the upper part of the sedimentation tank, and the outlet end of the second delivery pipeline is connected to the recovery tank;

[0011] The second dosing system is used for adding acid agent and scale inhibitor and dispersant into the second transmission pipeline.

[0012] In an optional embodiment, the first dosing system includes a first mixer, a second mixer, a third mixer, a fourth mixer, a first dosing device, a second dosing device, a third dosing device and a fourth dosing device;

[0013] The first mixer, the second mixer, the third mixer and the fourth mixer are arranged on the first conveying pipeline, the first dosing device is connected with the first mixer for adding an alkali agent thereto, the second dosing device is connected with the second mixer for adding a silicon removal agent into the second mixer, the third dosing device is connected with the third mixer for adding a hardness removal agent into the third mixer, and the fourth dosing device is connected with the fourth mixer for adding a flocculant into the fourth mixer;

[0014] Optionally, the first mixer, the second mixer, the third mixer and the fourth mixer are sequentially arranged on the first conveying pipeline, and the fourth mixer is closer to the sedimentation tank than the first mixer;

[0015] Alternatively, the second mixer and the third mixer are connected in parallel and are arranged on the pipeline between the first mixer and the fourth mixer, and the fourth mixer is closer to the sedimentation tank than the first mixer.

[0016] In an optional embodiment, a circle of overflow weir is provided at the top edge of the sedimentation tank, and the inlet end of the second delivery pipeline is connected to the overflow weir;

[0017] Optionally, a liquid inlet cylinder is provided in the sedimentation tank, the liquid inlet cylinder is located in the middle of the sedimentation tank, and extends from the top of the sedimentation tank to the bottom of the sedimentation tank;

[0018] Optionally, the bottom of the liquid inlet cylinder is in the shape of an inverted funnel.

[0019] In an optional embodiment, the sedimentation and dewatering system also includes a sludge discharge pipe, a sludge pump and a sludge dewatering device, one end of the sludge discharge pipe is connected to the sludge discharge port of the sedimentation tank, the sludge pump is arranged on the sludge discharge pipe, and the other end of the sludge discharge pipe is connected to the sludge dewatering device.

[0020] In an optional embodiment, the alkaline agent is selected from at least one of sodium hydroxide, potassium hydroxide and ferric hydroxide; preferably sodium hydroxide;

[0021] Optionally, the silicon removal agent is selected from at least one of magnesium chloride and magnesium oxide;

[0022] Optionally, the de-hardening agent is selected from at least one of sodium carbonate, calcium hydroxide and sodium hydroxide; preferably sodium carbonate;

[0023] Optionally, the flocculant is selected from at least one of polyacrylamide, sodium polyacrylate, polyaluminum and polyiron; preferably polyacrylamide.

[0024] In an optional embodiment, the second dosing system includes a fifth mixer, a fifth dosing device, and a sixth dosing device;

[0025] The fifth dosing device is used for adding scale inhibitor and dispersant into the fifth mixer, and the sixth dosing device is used for adding acid agent into the fifth mixer;

[0026] Optionally, the acid agent is selected from at least one of hydrochloric acid, nitric acid and citric acid; preferably hydrochloric acid.

[0027] In an alternative embodiment, the treatment system includes a first pH detector and a second pH detector;

[0028] The first pH detector is arranged at a position of the second delivery pipeline close to the sedimentation tank, and is used to detect the pH of the effluent of the sedimentation tank. The first pH detector is connected to the first dosing system for communication, and the target pH value of the first pH detector is set to 9-11. When the first pH detector detects that the pH value is lower than the target pH value, the first dosing system is controlled to increase the dosage of the alkali agent. When the first pH detector detects that the pH value is higher than the target pH value, the first dosing system is controlled to reduce the dosage of the alkali agent.

[0029] The second pH detector is arranged at a position capable of detecting the pH value of the liquid in the recovery tank, and is used to detect the pH value of the liquid in the recovery tank. The second pH detector is communicatively connected with the sixth dosing device, and the target pH value of the second pH detector is set to 6.5-8. When the second pH detector detects that the pH value is lower than the target pH value, the sixth dosing device is controlled to reduce the dosage of the acid agent. When the second pH detector detects that the pH value is higher than the target pH value, the sixth dosing device is controlled to increase the dosage of the acid agent.

[0030] In an optional embodiment, the treatment system further comprises a circulation pipeline, one end of which is connected to the water outlet of the recovery tank, and the other end of which is connected to the gasification system.

[0031] In a second aspect, the present invention provides a method for treating gasified water, using a treatment system as described in any one of the above embodiments to treat gasified water, comprising:

[0032] The gasified water discharged from the gasification system is transported to the settling tank through the first transport pipeline, and during the transport process, an alkali agent, a silicon removal agent, a hardness removal agent and a flocculant are added to the gasified water;

[0033] The vaporized water reaches the sedimentation tank, where the impurities contained in it settle. Under the action of the mud scraper, the sediment is scraped to the bottom of the tank and discharged from the mud outlet;

[0034] The upper clean water of the sedimentation tank is discharged from the top of the sedimentation tank, and is transported to the recovery tank through the second delivery pipe for storage. Acid agent and scale inhibitor dispersant are added to the upper clean water during transportation through the second delivery pipe.

[0035] In an optional embodiment, the amount of alkali added to the gasified water is adjusted to a pH of 9 to 11 at the outlet of the sedimentation tank;

[0036] Optionally, the acid added to the second delivery pipe is used to adjust the pH of the liquid in the pipe to 6.5-8.

[0037] The present invention has the following beneficial effects:

[0038] The gasified water treatment system and treatment method provided in this embodiment can treat gasified water. By adding an alkali agent, a silicon removal agent, a hardness removal agent, and a flocculant to the gasified water, silicon, calcium, and magnesium ions in the gasified water are precipitated, the alkalinity and hardness of the gasified water are reduced, and the water quality is softened; after precipitation, by adding an acid to the supernatant to adjust the pH value to a suitable range and adding a scale inhibitor dispersant at the same time, the treated water can be prevented from scaling in the pipeline. Therefore, the gasified water treatment system and treatment method provided by the present invention can improve the water quality, and the treated water has better water quality conditions and can be reused in the gasification system. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 A schematic structural diagram of a gasified water treatment system provided in the first embodiment;

[0041] Figure 2 A schematic structural diagram of a gasified water treatment system provided for the second embodiment.

[0042] Icons: 1-first dosing device; 2-second dosing device; 3-third dosing device; 4-fourth dosing device; 5-sludge scraper; 6-first pH detector; 7-sixth dosing device; 8-fifth dosing device; 9-second pH detector; 10-first mixer; 11-second mixer; 12-third mixer; 13-fourth mixer; 14-fifth mixer; 15-sedimentation tank; 16-liquid inlet cylinder; 17-recovery tank; 18-sludge pump; 19-circulating water pump; 20-sludge dewatering device; 21-gasification system. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be described clearly and completely below. If the specific conditions are not specified in the embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturer of the reagents or instruments used is not specified, they are all conventional products that can be purchased commercially.

[0044] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0045] First embodiment

[0046] like Figure 1 As shown, this embodiment provides a gasified water processing system, comprising:

[0047] A first delivery pipeline, a first dosing system, a sedimentation and dehydration system, a second delivery pipeline, a second dosing system and a recovery tank 17;

[0048] The first delivery pipeline is used to deliver the vaporized water to the sedimentation and dehydration system, and the first dosing system is arranged on the first delivery pipeline to inject an alkali agent, a silicon removal agent, a hardness removal agent and a flocculant into the first delivery pipeline;

[0049] The sedimentation and dewatering system includes a sedimentation tank 15 and a sludge scraper 5 arranged in the sedimentation tank 15. The outlet end of the first conveying pipeline is connected to the sedimentation tank 15. A sludge discharge port is arranged at the bottom of the sedimentation tank 15. The sludge scraper 5 is used to scrape the sludge in the sedimentation tank 15 to the bottom of the tank.

[0050] The inlet end of the second delivery pipeline is connected to the top of the sedimentation tank 15, and is used to discharge the clean water on the upper part of the sedimentation tank 15. The outlet end of the second delivery pipeline is connected to the recovery tank 17;

[0051] The second dosing system is used for adding acid agent and scale inhibitor and dispersant into the second transmission pipeline.

[0052] This embodiment also provides a method for treating gasified water, and the treatment system provided in this embodiment is used to treat the gasified water, including:

[0053] The gasified water discharged from the gasification system 21 is transported to the settling tank 15 through the first transport pipeline. During the transport process, an alkali agent, a silicon removal agent, a hardness removal agent and a flocculant are added to the gasified water.

[0054] The vaporized water reaches the sedimentation tank 15, where the impurities contained therein settle. Under the action of the mud scraper 5, the sediment is scraped to the bottom of the tank and discharged from the mud discharge port;

[0055] The upper clean water of the sedimentation tank 15 is discharged from the top of the sedimentation tank 15, and is transported to the recovery tank 17 through the second delivery pipe for storage. Acid agent and scale inhibitor dispersant are added to the upper clean water during the transportation process of the second delivery pipe.

[0056] The gasified water treatment system and treatment method provided in this embodiment can treat gasified water. By adding an alkali agent, a silicon removal agent, a hardness removal agent, and a flocculant to the gasified water, the silicon, calcium, and magnesium ions in the gasified water are precipitated, the hardness of the gasified water is reduced, and the water quality is softened. After precipitation, by adding an acid to the supernatant to adjust the pH value to a suitable range and adding a scale inhibitor dispersant at the same time, the treated water can be prevented from scaling in the pipeline. Therefore, the gasified water treatment system and treatment method provided by the present invention can improve the water quality, and the treated water has better water quality conditions and can be reused in the gasification system 21.

[0057] It should be noted that the gasified water to be treated in the present invention is not limited to the gasified water produced by the coal gasification process, but also includes similar water sources with high solid content, alkalinity and high hardness, whose solid content can be between 3% and 20%, alkalinity is above 300 mg / L, and hardness is above 500 mg / L.

[0058] Optionally, the first dosing system includes a first mixer 10, a second mixer 11, a third mixer 12, a fourth mixer 13, a first dosing device 1, a second dosing device 2, a third dosing device 3 and a fourth dosing device 4;

[0059] The first mixer 10, the second mixer 11, the third mixer 12 and the fourth mixer 13 are arranged on the first conveying pipeline, the first dosing device 1 is connected to the first mixer 10 for adding alkali agent therein, the second dosing device 2 is connected to the second mixer 11 for adding silicon removal agent into the second mixer 11, the third dosing device 3 is connected to the third mixer 12 for adding hardening removal agent into the third mixer 12, and the fourth dosing device 4 is connected to the fourth mixer 13 for adding flocculant into the fourth mixer 13.

[0060] Optionally, the first mixer 10 , the second mixer 11 , the third mixer 12 and the fourth mixer 13 are sequentially arranged on the first conveying pipeline, and the fourth mixer 13 is closer to the sedimentation tank 15 than the first mixer 10 .

[0061] The vaporized water is transported in the first conveying pipeline. When the vaporized water reaches the first mixer 10, the alkali agent added by the first dosing device 1 is mixed with the vaporized water to adjust the pH of the vaporized water; when the vaporized water reaches the second mixer 11, the silicon removal agent added by the second dosing device 2 is mixed with the vaporized water to precipitate the silicon therein; when the vaporized water reaches the third mixer 12, the hardness removal agent added by the third dosing device 3 is mixed with the vaporized water to fully precipitate the metal ions therein to achieve the hardness removal effect; when the vaporized water reaches the fourth mixer 13, the flocculant added by the fourth dosing device 4 is mixed with the vaporized water to flocculate the precipitate generated in the vaporized water into large flocs, which finally enter the sedimentation tank 15 and are finally discharged from the device through the mud discharge port.

[0062] Optionally, the alkali agent is added in the form of a solution. The main function of the alkali agent addition is to adjust the pH of the gasified water to a suitable range. The alkali agent is selected from at least one of sodium hydroxide, potassium hydroxide and ferric hydroxide; preferably sodium hydroxide.

[0063] Optionally, the silicon removal agent is selected from at least one of magnesium chloride and magnesium oxide. Silicon exists in the form of aluminosilicate in the gasified water, and the addition of magnesium salt can precipitate silicon. Preferably, the silicon removal agent is magnesium chloride.

[0064] Optionally, the de-hardening agent is selected from at least one of sodium carbonate, calcium hydroxide and sodium hydroxide. The de-hardening agent is preferably sodium carbonate, which can react with magnesium ions, calcium ions and the like in the gasified water to form a precipitate, thereby achieving a de-hardening effect. Although sodium hydroxide is added to the gasified water before adding sodium carbonate, and sodium hydroxide can precipitate most of the calcium and magnesium ions, since calcium hydroxide and magnesium hydroxide still have a certain solubility in the gasified water, sodium carbonate is continued to be added to react with calcium and magnesium ions to form calcium carbonate and magnesium carbonate with lower solubility, so as to further reduce the content of calcium and magnesium ions in the gasified water.

[0065] Optionally, the flocculant is selected from polyacrylamide, sodium polyacrylate, polyaluminum (PAC, 聚合氯化铝 ) and polyferric sulfate (PAFC, polyferric sulfate). Polyacrylamide flocculant is preferred, which can achieve better flocculation effect.

[0066] Optionally, a circle of overflow weir is provided at the top edge of the sedimentation tank 15, and the inlet end of the second conveying pipeline is connected to the overflow weir.

[0067] Optionally, a liquid inlet cylinder 16 is provided in the sedimentation tank 15 , and the liquid inlet cylinder 16 is located in the middle of the sedimentation tank 15 and extends from the top of the sedimentation tank 15 to the bottom of the sedimentation tank 15 .

[0068] The arrangement of the liquid inlet cylinder 16 can separate the vaporized water after the addition of the reagent from the clear liquid after the sedimentation, ensuring that the water discharged from the top of the sedimentation tank 15 does not contain sediment.

[0069] Optionally, in this embodiment, the bottom of the liquid inlet cylinder 16 is in an inverted funnel shape. This structure can better prevent the floccules at the bottom from moving upward, and further prevent the presence of sediment in the discharged clean water.

[0070] Furthermore, the sedimentation and dewatering system also includes a sludge discharge pipe, a sludge pump 18 and a sludge dewatering device 20, one end of the sludge discharge pipe is connected to the sludge discharge port of the sedimentation tank 15, the sludge pump 18 is arranged on the sludge discharge pipe, and the other end of the sludge discharge pipe is connected to the sludge dewatering device 20.

[0071] The settled flocs are concentrated at the bottom of the sedimentation tank by the scraper, and are pumped out to the sludge dewatering device 20 by the sludge pump 18, where they are dehydrated.

[0072] Optionally, the second dosing system includes a fifth mixer 14, a fifth dosing device 8 and a sixth dosing device 7;

[0073] The fifth dosing device 8 is used for adding anti-scaling dispersant into the fifth mixer 14 , and the sixth dosing device 7 is used for adding acid agent into the fifth mixer 14 .

[0074] The pH value of the supernatant discharged from the sedimentation tank 15 is high, and it is easy to cause scaling when entering the pipeline. Therefore, an acid is added to the supernatant by the fifth mixer 14 to adjust the pH value to neutral or close to neutral, and a scale inhibitor is added to prevent the treated water from scaling easily.

[0075] Optionally, the acid is selected from at least one of hydrochloric acid, nitric acid and citric acid, preferably hydrochloric acid. The acid is used to adjust the pH of water to be neutral or weakly alkaline, and the scale inhibitor dispersant can be selected from at least one of hydroxyethylidene diphosphonic acid, 2-phosphonic acid butane-1,2,4-tricarboxylic acid, acrylic acid-2-acrylamide-2-methylpropane sulfonic acid copolymer, polymaleic acid and other similar functional substances (prepared according to water quality conditions), which plays a role in alleviating scaling of the water system and deposition of insoluble substances in the water. Further, the gasification water treatment system also includes a first pH detector 6 and a second pH detector 9.

[0076] The first pH detector 6 is arranged at a position of the second delivery pipeline close to the sedimentation tank 15, and is used to detect the pH of the effluent of the sedimentation tank 15. The first pH detector 6 is connected to the first dosing device 1 for communication, and the target pH value of the first pH detector 6 is set to 9-10. When the first pH detector 6 detects that the pH value is lower than the target pH value, the first dosing device 1 is controlled to increase the dosage of the alkali agent. When the first pH detector 6 detects that the pH value is higher than the target pH value, the first dosing device 1 is controlled to reduce the dosage of the alkali agent.

[0077] The second pH detector 9 is arranged at a position capable of detecting the pH value of the liquid in the recovery tank 17, and is used to detect the pH value of the liquid in the recovery tank 17. The second pH detector 9 is connected to the sixth dosing device 7 for communication, and the target pH value of the second pH detector 9 is set to 6.5-7. When the second pH detector 9 detects that the pH value is lower than the target pH value, the sixth dosing device 7 is controlled to reduce the dosage of the acid agent. When the second pH detector 9 detects that the pH value is higher than the target pH value, the sixth dosing device 7 is controlled to increase the dosage of the acid agent.

[0078] By providing the first pH detector 6 and the second pH detector 9, and setting them to communicate with the first dosing device 1 and the sixth dosing device 7 respectively, the automatic dosing of the reagent is realized to control the pH within the appropriate range. Setting the target value of the first pH detector to 9 to 10 can ensure that the pH value added at the front end is within the appropriate range, and ensure that the impurity elements in the gasified water are fully removed.

[0079] Optionally, the treatment system further includes a circulation pipeline, one end of which is connected to the water outlet of the recovery tank 17, and the other end of which is connected to the gasification system 21. The circulation pipeline is provided with a circulation water pump 19 for pumping the water in the recovery tank 17 into the gasification system 21. The second pH detector 9 is provided at a position close to the recovery tank 17 on the circulation pipeline.

[0080] A circulation pipeline is set up so that the treated gasified water can be circulated in the gasification device, which plays a role in recycling and saving water resources.

[0081] Second embodiment

[0082] like Figure 2 As shown, this embodiment is basically the same as the first embodiment, and the parts not described refer to the first embodiment, and the only difference is that:

[0083] On the first conveying pipeline, the second mixer and the third mixer 12 are connected in parallel and are arranged on the pipeline between the first mixer 10 and the fourth mixer 13 . The fourth mixer 13 is closer to the sedimentation tank 15 than the first mixer 10 .

[0084] After the alkali agent is added to the first mixer 10, the vaporized water is divided into two paths. One path reaches the second mixer 11, and the desiliconizing agent is added under the action of the second feeding device; the other path reaches the third mixer 12, and the desiliconizing agent is added under the action of the third feeding device. After that, they are mixed into one path that passes through the fourth mixer 13 and finally enters the sedimentation tank 15.

[0085] In this embodiment, the liquid inlet cylinder 16 is a straight cylinder structure.

[0086] In this embodiment, the target pH value of the first pH detector 6 is set to 10-11; the target pH value of the second pH detector 9 is set to 7-8.

[0087] In summary, the gasified water treatment system and treatment method provided in this embodiment have the following characteristics:

[0088] (1) The system integrates the process technologies of optimizing the pH value of gasified water (water neutralization), reducing silicon and hardness (water softening), and flocculation and sedimentation (reducing solid content and suspended matter), changing the traditional single treatment method of gasified water, which only has flocculation and sedimentation;

[0089] (2) The technical solution of the present invention improves the traditional complex water neutralization and softening process. The technical solution of the present invention can be used to transform and implement both newly built devices and existing old gasification water treatment systems. The requirements and costs for implementing the solution are also much lower than the current conventional technical means.

[0090] (3) The system optimizes various water quality indicators, especially reduces the content of scaling ions in the water, effectively alleviates scaling of the system and equipment, and is conducive to the long-term stable operation of the gasification device;

[0091] (4) It improves the water reuse rate of the device, reduces the water consumption and operating costs of the system, and has economic and social benefits.

[0092] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A gasified water treatment system, characterized in that: include: A first delivery pipeline, a first dosing system, a sedimentation and dehydration system, a second delivery pipeline, a second dosing system, and a recovery tank; The first delivery pipeline is used to deliver the vaporized water to the sedimentation and dehydration system, and the first dosing system is arranged on the first delivery pipeline to inject an alkali agent, a silicon removal agent, a hardness removal agent and a flocculant into the first delivery pipeline; The sedimentation and dehydration system comprises a sedimentation tank and a sludge scraper arranged in the sedimentation tank, the outlet end of the first conveying pipeline is connected to the sedimentation tank, a sludge discharge port is arranged at the bottom of the sedimentation tank, and the sludge scraper is used to scrape the sludge in the sedimentation tank to the bottom of the tank; The inlet end of the second delivery pipeline is communicated with the top of the sedimentation tank for discharging clean water from the upper part of the sedimentation tank, and the outlet end of the second delivery pipeline is communicated with the recovery tank; The second dosing system is used for adding an acid agent and a scale inhibitor and dispersant into the second delivery pipeline.

2. The processing system according to claim 1, characterized in that The first dosing system includes a first mixer, a second mixer, a third mixer, a fourth mixer, a first dosing device, a second dosing device, a third dosing device and a fourth dosing device; The first mixer, the second mixer, the third mixer and the fourth mixer are arranged on the first conveying pipeline, the first dosing device is connected to the first mixer for adding an alkali agent thereto, the second dosing device is connected to the second mixer for adding a silicon remover into the second mixer, the third dosing device is connected to the third mixer for adding a hard remover into the third mixer, and the fourth dosing device is connected to the fourth mixer for adding a flocculant into the fourth mixer; Optionally, the first mixer, the second mixer, the third mixer and the fourth mixer are sequentially arranged on the first conveying pipeline, and the fourth mixer is closer to the sedimentation tank than the first mixer; Alternatively, the second mixer and the third mixer are connected in parallel and are arranged on a pipeline between the first mixer and the fourth mixer, and the fourth mixer is closer to the sedimentation tank than the first mixer.

3. The processing system according to claim 1, characterized in that A circle of overflow weir is arranged at the top edge of the sedimentation tank, and the inlet end of the second delivery pipeline is connected to the overflow weir; Optionally, a liquid inlet cylinder is provided in the sedimentation tank, and the liquid inlet cylinder is located in the middle of the sedimentation tank and extends from the top of the sedimentation tank to the bottom of the sedimentation tank; Optionally, the bottom of the liquid inlet cylinder is in the shape of an inverted funnel.

4. The processing system according to claim 1, characterized in that The sedimentation and dewatering system also includes a sludge discharge pipe, a sludge pump and a sludge dewatering device. One end of the sludge discharge pipe is connected to the sludge discharge port of the sedimentation tank. The sludge pump is arranged on the sludge discharge pipe. The other end of the sludge discharge pipe is connected to the sludge dewatering device.

5. The processing system according to claim 1, characterized in that The alkaline agent is selected from at least one of sodium hydroxide, potassium hydroxide and ferric hydroxide; preferably sodium hydroxide; Optionally, the silicon removal agent is selected from at least one of magnesium chloride and magnesium oxide; Optionally, the de-hardening agent is selected from at least one of sodium carbonate, calcium hydroxide and sodium hydroxide; preferably sodium carbonate; Optionally, the flocculant is selected from at least one of polyacrylamide, sodium polyacrylate, polyaluminum and polyiron; preferably polyacrylamide.

6. The processing system according to claim 1, characterized in that The second dosing system includes a fifth mixer, a fifth dosing device and a sixth dosing device; The fifth dosing device is used to add the scale inhibitor and dispersant into the fifth mixer, and the sixth dosing device is used to add the acid agent into the fifth mixer; Optionally, the acid agent is selected from at least one of hydrochloric acid, nitric acid and citric acid; preferably hydrochloric acid.

7. The processing system according to claim 6, characterized in that The treatment system includes a first pH detector and a second pH detector; The first pH detector is arranged at a position of the second delivery pipeline close to the sedimentation tank, and is used to detect the pH of the effluent of the sedimentation tank. The first pH detector is in communication connection with the first dosing system, and a target pH value of the first pH detector is set to 9-11. When the first pH detector detects that the pH value is lower than the target pH value, the first dosing system is controlled to increase the dosage of the alkali agent. When the first pH detector detects that the pH value is higher than the target pH value, the first dosing system is controlled to reduce the dosage of the alkali agent. The second pH detector is arranged at a position capable of detecting the pH value of the liquid in the recovery tank, and is used to detect the pH value of the liquid in the recovery tank. The second pH detector is communicatively connected with the sixth dosing device, and a target pH value of the second pH detector is set to 6.5-8. When the second pH detector detects that the pH value is lower than the target pH value, the sixth dosing device is controlled to reduce the dosage of the acid agent. When the second pH detector detects that the pH value is higher than the target pH value, the sixth dosing device is controlled to increase the dosage of the acid agent.

8. The processing system according to claim 1, characterized in that The treatment system further comprises a circulation pipeline, one end of which is in communication with the water outlet of the recovery tank, and the other end of which is in communication with the gasification system.

9. A method for treating gasified water, characterized in that: The gasified water is treated by using the treatment system according to any one of claims 1 to 8, comprising: The gasified water discharged from the gasification system is transported to the settling tank through the first transport pipeline, and during the transport process, an alkali agent, a silicon removal agent, a hardness removal agent and a flocculant are added to the gasified water; The gasified water reaches the sedimentation tank, where the impurities contained therein settle, and the sediment is scraped to the bottom of the tank by the scraper and discharged from the mud outlet; The upper clean water of the sedimentation tank is discharged from the top of the sedimentation tank, and is transported to the recovery tank through the second delivery pipe for storage. Acid agent and scale inhibitor and dispersant are added to the upper clean water during transportation through the second delivery pipe.

10. The processing method according to claim 9, characterized in that: The amount of the alkali added to the gasified water is adjusted to a pH of 9 to 11 at the outlet of the sedimentation tank; Optionally, the acid added to the second delivery pipe is used to adjust the pH of the liquid in the pipe to 6.5-8.

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