A coal chemical gasification wastewater ammonia nitrogen treatment device

Abstract

The utility model discloses a coal chemical gasification wastewater ammonia nitrogen treatment device, and the utility model relates to the technical field of wastewater treatment equipment. The coal chemical gasification wastewater ammonia nitrogen treatment device comprises a high-efficiency clarifier, a gas collecting component, an open cooling tower, a regulating tank, a washing tower 1, a washing tower 2, a washing tower 3, a chimney, a fan, a circulating water pump and a chiller; the high-efficiency clarifier is connected to the open cooling tower, the gas collecting component is arranged outside the open cooling tower, the gas collecting component is connected to the washing tower 1, the washing tower 1 is connected to the washing tower 2, the washing tower 2 is connected to the washing tower 3, the utility model utilizes the high temperature of the wastewater, the conditions of hardness removal and stripping treatment, effectively and stably reduces the subsequent biochemical unit ammonia nitrogen treatment load, and the ammonia nitrogen in the wastewater is resourced, and the gasification and desulfurization production equipment in the coal chemical field can be used to realize on-site resource recovery.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment equipment, in particular to a coal chemical industry gasification wastewater ammonia nitrogen treatment device. Background Art

[0002] Coal gasification process is a good way to achieve clean and efficient use of coal, and is also one of the main ways to produce chemical products using coal as raw material. In recent years, with the large number of new and expanded projects mainly based on coal-to-oil, coal-to-ethylene glycol, and coal-to-olefins, coal chemical technology has developed rapidly. Coal gasification is widely used in coal-to-gas, synthetic ammonia, coal-to-power generation, production of various coal-based chemicals and coal-based low-carbon olefins, etc., and is one of the core technologies of coal chemical industry.

[0003] A large amount of coal gasification wastewater will be generated during the coal gasification process. The wastewater contains ammonia nitrogen, sulfide, cyanide, etc. If it is discharged directly without treatment, it will cause serious environmental pollution, cause algae and microorganisms in the water to multiply in large numbers, and lead to eutrophication. In industry, ammonia nitrogen and other pollutants are generally removed by a stripping device before entering a biochemical treatment device for further treatment. Due to the problems of stripping tower plate blockage, poor heat exchange effect of heat exchanger, mixer blockage and high water vapor consumption in the stripping device, the operation effect is not good, the operation is difficult, the operation cost is high, and the effluent ammonia nitrogen content is high, which has an adverse effect on the biochemical treatment process. The ammonia nitrogen load is high, and the effluent ammonia nitrogen is not easy to meet the standard. At the same time, the impact of high ammonia nitrogen wastewater on the environment has attracted attention in the field of environmental protection and the world. my country has formulated more stringent emission standards for ammonia nitrogen emissions. Research on economical and efficient deammonification technology has become the focus and hotspot in the field of industrial waste gas and wastewater pollution control engineering. Therefore, we propose a coal chemical gasification wastewater ammonia nitrogen treatment device to solve the above-mentioned problems. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a coal chemical industry gasification wastewater ammonia nitrogen treatment device to solve the problem of gasification wastewater ammonia nitrogen treatment.

[0005] To achieve the above purpose, the utility model is implemented through the following technical solutions: a coal chemical gasification wastewater ammonia nitrogen treatment device, including a high-efficiency clarification tank, a gas collection component, an open cooling tower, a regulating tank, a washing tower 1, a washing tower 2, a washing tower 3, a chimney, a fan, a circulating water pump and a chiller;

[0006] The high-efficiency clarification tank is conductively connected to the open cooling tower, the gas collecting assembly is arranged outside the open cooling tower, the gas collecting assembly is conductively connected to the first washing tower, the first washing tower is conductively connected to the second washing tower, the second washing tower is conductively connected to the third washing tower, and the third washing tower is conductively connected to the chimney through a fan;

[0007] The regulating tank is arranged below the open cooling tower.

[0008] Preferably, the high-efficiency clarification tank is combined with an open cooling tower treatment process, and the open cooling tower integrates cooling and air stripping functions.

[0009] Preferably, the washing tower 1 and the washing tower 2 use water washing.

[0010] Preferably, the washing tower three adopts sulfuric acid pickling.

[0011] Preferably, the gas collecting assembly comprises a gas collecting hood, a mounting frame is arranged on one side of the outer wall of the gas collecting hood, a fixing ring is arranged at the bottom of the gas collecting hood and outside the opening end, and the bottom end of the fixing ring is connected to a supporting ring through an accordion cover;

[0012] Adjustment parts are arranged on both sides of the fixing ring, and the two adjustment parts are respectively connected to the two side walls of the supporting ring.

[0013] Preferably, the adjustment part comprises a first positioning block arranged on the outer wall of the support ring and a second positioning block arranged on the fixing ring, a square hole is opened on one side of the top surface of the second positioning block, a square rod is inserted into the inner cavity of the square hole, and the bottom end of the square rod is connected to the top surface of the first positioning block;

[0014] A screw hole is provided in the middle of one end of the first positioning block, and a limiting screw rod is rotatably connected to the inner cavity of the screw hole.

[0015] Preferably, an anti-drop plate is fixedly provided on the top end of the square rod.

[0016] Beneficial Effects

[0017] The utility model provides a device for treating ammonia nitrogen in coal chemical gasification wastewater. Compared with the prior art, it has the following beneficial effects:

[0018] The coal chemical gasification wastewater ammonia nitrogen treatment device dissociates the ammonia nitrogen in the water into ammonia gas by utilizing the high temperature characteristics of the gasification wastewater and the high pH value that must be adjusted for softening. While using the open cooling tower for air cooling, the air can carry away the ammonia nitrogen, which can achieve softening and cooling, and can effectively reduce the ammonia nitrogen in the water.

[0019] The gasification wastewater softened by the high-efficiency clarifier can effectively reduce scaling of subsequent process equipment and pipelines. By washing the ammonia-containing air twice with water and once with acid, ammonia water and ammonium sulfate products are generated. The equipment in the coal chemical plant area can be used to achieve on-site resource recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 System principle diagram of the utility model device;

[0021] Figure 2 This is a schematic diagram of the structure of the gas collection assembly of the utility model;

[0022] Figure 3 This is a schematic diagram of the bottom structure of the utility model;

[0023] Figure 4 It is a structural schematic diagram of the adjustment part of the utility model.

[0024] In the figure: 1. High-efficiency clarification tank; 2. Gas collecting assembly; 21. Gas collecting hood; 22. Mounting frame; 23. Fixing ring; 24. Organ cover; 25. Support ring; 26. Adjustment part; 261. First positioning block; 262. Second positioning block; 263. Square hole; 264. Square rod; 265. Screw hole; 266. Limit screw; 267. Anti-slip plate; 3. Open cooling tower; 4. Regulating tank; 5. Washing tower one; 6. Washing tower two; 7. Washing tower three; 8. Chimney; 9. Fan; 10. Circulating water pump; 11. Chiller. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] See also Figure 1 The utility model provides a technical solution: a coal chemical gasification wastewater ammonia nitrogen treatment device, including a high-efficiency clarification tank 1, a gas collection component 2, an open cooling tower 3, a regulating tank 4, a washing tower 1 5, a washing tower 2 6, a washing tower 3 7, a chimney 8, a fan 9, a circulating water pump 10 and a chiller 11; the high-efficiency clarification tank 1 is connected to the open cooling tower 3, the gas collection component 2 is arranged outside the open cooling tower 3, the gas collection component 2 is connected to the washing tower 1 5, the washing tower 1 5 is connected to the washing tower 2 6, the washing tower 2 6 is connected to the washing tower 3 7, and the washing tower 3 7 is connected to the chimney 8 through the fan 9; the regulating tank 4 is arranged below the open cooling tower 3;

[0027] The gasified wastewater enters the high-efficiency clarification tank 1 at high temperature, and after being softened by desuspension, enters the open cooling tower 3 for cooling. At the same time, the ammonia in the water is taken away by air, and the ammonia nitrogen and temperature in the water are effectively reduced before entering the regulating tank 4. Then, the air taking away the ammonia is collected by the air collecting component 2 and the fan 9, and the ammonia in the air is absorbed through two-stage water washing and one-stage acid washing to generate ammonia water and ammonium sulfate for recovery, and the auxiliary circulating water pump 10 and the chiller 11 are used to increase the concentration of ammonia water.

[0028] See also Figure 1, the high-efficiency clarification tank 1 is combined with the open cooling tower 3 treatment process, and the open cooling tower 3 integrates the cooling and stripping functions.

[0029] See also Figure 1 , washing tower 1 5 and washing tower 2 6 adopt water washing.

[0030] See also Figure 1 , washing tower 37 uses sulfuric acid for pickling.

[0031] See also Figure 1-Figure 4 The gas collecting assembly 2 includes a gas collecting cover 21, a mounting frame 22 is provided on one side of the outer wall of the gas collecting cover 21, a fixing ring 23 is provided at the bottom of the gas collecting cover 21 and outside the opening end, and the bottom end of the fixing ring 23 is connected to the supporting ring 25 through the accordion cover 24; adjustment parts 26 are provided on both sides of the fixing ring 23, and the two adjustment parts 26 are respectively connected to the two side walls of the supporting ring 25, and the adjustment part 26 includes a first positioning block 261 provided on the outer wall of the supporting ring 25 and a second positioning block 262 provided on the fixing ring 23, a square hole 263 is provided on one side of the top surface of the second positioning block 262, a square rod 264 is inserted into the inner cavity of the square hole 263, and the bottom end of the square rod 264 is connected to the top surface of the first positioning block 261, a screw hole 265 is provided in the middle of one end of the first positioning block 261, and the inner cavity of the screw hole 265 is rotatably connected to a limiting screw 266, and an anti-slip plate 267 is fixedly provided on the top of the square rod 264;

[0032] The gas collecting hood 21 in the gas collecting assembly 2 can be installed at a designated position through the mounting frame 22, and can also cover the open cooling tower 3, so that the ammonia can be easily introduced into the washing tower 5, and then the accordion cover 24 can be fixed to the bottom of the gas collecting hood 21 through the fixing ring 23, and can also be installed on the support ring 25, so that the effect of ammonia collection can be ensured under the shielding of the accordion cover 24, thereby reducing the outward diffusion of ammonia, and then the first positioning block 261 can be fixed to the outside of the support ring 25. The wall can be installed and fixed to the bottom end of the opposite rod 264, and then the second positioning block 262 can be fixed to the outer wall of the fixing ring 23, and can be plugged and installed to the opposite rod 264 through the square hole 263, and then the limiting screw 266 in the rotating screw hole 265 can be used to adjust the position of the square rod 264 in the square hole 263, and then the position of the first positioning block 261 can be adjusted synchronously, so that the accordion cover 24 can cover the split cooling tower 3, and at the same time prevent the accordion cover 24 from shaking during use.

[0033] During operation, the first step is: the gasified wastewater first enters the high-efficiency clarification tank, in which lime or sodium hydroxide is added to adjust the pH to about 11, and flocculants, coagulants and soda ash are added to treat the suspended matter and hardness in the water through coagulation, flocculation, softening reaction and clarification precipitation.

[0034] Step 2: The effluent from the efficient clarification tank does not need to adjust the pH. Ammonia nitrogen is dissociated under high temperature and high pH conditions to form ammonia gas, which then directly enters the open cooling tower for cooling. While cooling, the air is used to carry away the dissolved ammonia in the water to achieve efficient reduction of the ammonia nitrogen content in the wastewater.

[0035] Step 3: The gasified wastewater after cooling in the cooling tower and ammonia nitrogen treatment enters the regulating tank.

[0036] Step 4: In the open cooling tower, the wastewater is cooled and the gas that carries away the ammonia is collected through the gas collecting hood and the negative pressure of the fan. The collected air containing ammonia passes through the washing tower 1 for the first-level water washing. Water is used as the ammonia absorption liquid to absorb the ammonia in the gas into the water to generate ammonia water. The gas after the first-level water washing enters the washing tower 2 for the second-level water washing, and the circulating pump and the chiller are used to increase the concentration of the ammonia water. The chiller is used to reduce the temperature of the absorption liquid. The collected ammonia water can be sent to the gasification device in the re-site for recycling.

[0037] Step 5: The air after two-stage water washing enters washing tower three. The absorption liquid of washing tower three uses sulfuric acid to absorb ammonia in the air to generate ammonium sulfate. The air washed with absorption liquid three times is discharged through the chimney in compliance with the standards. The collected ammonium sulfate can be sent to the desulfurization device area of ​​the site for recycling.

[0038] In summary, the device utilizes the high temperature of wastewater, hardness removal and stripping treatment conditions in a combined manner to effectively and stably reduce the ammonia nitrogen treatment load of subsequent biochemical units, and transform the ammonia nitrogen in the wastewater into resources. The gasification and desulfurization production equipment in the coal chemical plant can be used to achieve on-site resource recovery.

[0039] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

Claims

1. A coal chemical gasification wastewater ammonia nitrogen treatment device, characterized by: It comprises a high-efficiency clarifier (1), a gas collecting assembly (2), an open cooling tower (3), a regulating tank (4), a washing tower 1 (5), a washing tower 2 (6), a washing tower 3 (7), a chimney (8), a fan (9), a circulating water pump (10) and a chiller (11); The high-efficiency clarification tank (1) is conductively connected to the open cooling tower (3), the gas collecting assembly (2) is arranged outside the open cooling tower (3), the gas collecting assembly (2) is conductively connected to the washing tower 1 (5), the washing tower 1 (5) is conductively connected to the washing tower 2 (6), the washing tower 2 (6) is conductively connected to the washing tower 3 (7), and the washing tower 3 (7) is conductively connected to the chimney (8) via a fan (9); The regulating tank (4) is arranged below the open cooling tower (3).

2. A coal chemical gasification wastewater ammonia nitrogen treatment device according to claim 1, characterized in that: The high-efficiency clarification tank (1) is combined with an open cooling tower (3) for treatment, and the open cooling tower (3) integrates the functions of cooling and blowing off.

3. A coal chemical gasification wastewater ammonia nitrogen treatment device according to claim 1, characterized in that: The gas collecting assembly (2) comprises a gas collecting hood (21), a mounting frame (22) is arranged on one side of the outer wall of the gas collecting hood (21), a fixing ring (23) is arranged at the bottom of the gas collecting hood (21) and outside the opening end, and the bottom end of the fixing ring (23) is connected to a supporting ring (25) via an accordion cover (24); Adjustment parts (26) are provided on both sides of the fixing ring (23), and the two adjustment parts (26) are respectively connected to the two side walls of the supporting ring (25).

4. A coal chemical gasification wastewater ammonia nitrogen treatment device according to claim 3, characterized in that: The adjusting portion (26) comprises a first positioning block (261) arranged on the outer wall of the supporting ring (25) and a second positioning block (262) arranged on the fixing ring (23); a square hole (263) is provided on one side of the top surface of the second positioning block (262); a square rod (264) is inserted into the inner cavity of the square hole (263), and the bottom end of the square rod (264) is connected to the top surface of the first positioning block (261); A screw hole (265) is provided in the middle of one end of the first positioning block (261), and the inner cavity of the screw hole (265) is rotatably connected to a limiting screw rod (266).

5. A coal chemical gasification wastewater ammonia nitrogen treatment device according to claim 4, characterized in that: An anti-drop plate (267) is fixedly provided on the top end of the square rod (264).

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