Ammonia three-stage liquid separation system for semi-coke wastewater treatment

Abstract

An ammonia three-stage liquid separation system for semi-coke wastewater treatment is characterized in that an inlet A of a first-stage fractional condenser is connected with a crude ammonia gas conveying pipe, an outlet A of the first-stage fractional condenser is connected with a feeding hole of a first-stage liquid separation tank, an inlet B of the first-stage fractional condenser is connected with a raw material water conveying pipe, and an outlet B of the first-stage fractional condenser is connected with a raw material water inlet of a deamination tower; a bottom drain pipe of the first-stage liquid separation tank is connected with an inlet of the ammonia condensate cooler, a top exhaust pipe is connected with a feed port of the second-stage liquid separation tank through the second-stage fractional condenser, a bottom drain pipe of the second-stage liquid separation tank is connected with an inlet of the ammonia condensate cooler, and a top exhaust pipe is connected with a feed port of the third-stage liquid separation tank through the third-stage fractional condenser; a liquid discharge pipe at the bottom of the third-stage liquid separation tank is connected with an outlet of the ammonia condensate cooler in parallel and is connected with an inlet of the ammonia condensate oil separation tank, an exhaust pipe is arranged at the top of the third-stage liquid separation tank, an oil discharge port of the ammonia condensate oil separation tank is connected with a light oil collection tank, and a liquid discharge port is output through an ammonia condensate pump. According to the device, a three-stage liquid separation structure is adopted, and the recovery rate of ammonia can be effectively improved through fractional condensation and liquid separation step by step.

Description

Technical Field

[0001] This utility model belongs to the technical field of semi-coke wastewater treatment equipment, specifically relating to a three-stage ammonia separation system for semi-coke wastewater treatment. Background Technology

[0002] The production of semi-coke generates a large amount of wastewater containing high concentrations of pollutants such as ammonia nitrogen. Direct discharge without treatment would cause serious environmental pollution and waste ammonia resources. Currently, various methods exist for treating semi-coke wastewater, with ammonia recovery and utilization being a key component.

[0003] Traditional semi-coke wastewater treatment systems have several shortcomings in ammonia recovery. For example, systems using single condensation or separation devices have low ammonia recovery efficiency, failing to fully separate ammonia from the wastewater, resulting in significant ammonia loss and increasing the burden on subsequent treatment processes. Furthermore, some systems lack effective automated control methods, making it difficult to accurately control operating parameters such as liquid level, pressure, and temperature. This affects system stability and treatment effectiveness, easily leading to problems such as excessively high or low liquid levels, large pressure fluctuations, and substandard temperatures, ultimately resulting in incomplete ammonia recovery or unstable equipment operation. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a three-stage ammonia separation system for treating semi-coke wastewater with improved ammonia recovery and utilization rate, reduced wastewater treatment costs, and reduced environmental pollution.

[0005] The technical solution adopted to solve the above-mentioned technical problems is as follows: a three-stage ammonia separation system for treating semi-coke wastewater, wherein the inlet A of the first-stage condenser is connected to the crude ammonia gas transmission pipe, and the outlet A is connected to the feed inlet of the first-stage separation tank; the inlet B of the first-stage condenser is connected to the raw water transmission pipe, and the outlet B is connected to the raw water inlet of the deammoniation tower; the bottom drain pipe of the first-stage separation tank is connected to the inlet of the ammonia condensate cooler, and the top exhaust pipe is connected to the feed inlet of the second-stage separation tank through the second-stage condenser; the bottom drain pipe of the second-stage separation tank is connected to the inlet of the ammonia condensate cooler, and the top exhaust pipe is connected to the feed inlet of the third-stage separation tank through the third-stage condenser; the bottom drain pipe of the third-stage separation tank and the outlet of the ammonia condensate cooler are connected in parallel to the inlet of the ammonia condensate oil separation tank; an exhaust pipe is provided at the top of the third-stage separation tank; the oil outlet of the ammonia condensate oil separation tank is connected to the light oil collection tank, and the drain outlet is connected to the ammonia condensate transmission pipe through the ammonia condensate pump.

[0006] As a preferred technical solution, the primary, secondary, and tertiary separating tanks are respectively equipped with a first liquid level indicator and control alarm, a second liquid level indicator and control alarm, and a third liquid level indicator and control alarm. A first liquid level control valve is installed on the bottom drain pipe of the primary separating tank, a second liquid level control valve is installed on the bottom drain pipe of the secondary separating tank, and a third liquid level control valve is installed on the bottom drain pipe of the tertiary separating tank. The first liquid level indicator and control alarm is electrically connected to the first liquid level control valve, the second liquid level indicator and control alarm is electrically connected to the second liquid level control valve, and the third liquid level indicator and control alarm is electrically connected to the third liquid level control valve.

[0007] As a preferred technical solution, the top of the primary separator and the tertiary separator are respectively equipped with a first pressure indication and control alarm, a second pressure indication and control alarm, and a third pressure indication and control alarm. A first pressure control valve is installed on the exhaust pipe at the top of the primary separator, and the first pressure control valve is electrically connected to the first pressure indication and control alarm. A second pressure control valve is installed on the exhaust pipe at the top of the tertiary separator, and the second pressure control valve is electrically connected to the third pressure indication and control alarm.

[0008] As a preferred technical solution, a first temperature control valve is installed on the cooling water outlet pipe of the secondary condenser, and a first temperature indication and control alarm is installed on the pipe between the secondary condenser and the feed inlet of the secondary separator, and the first temperature indication and control alarm is electrically connected to the first temperature control valve.

[0009] As a preferred technical solution, a second temperature control valve is installed on the cooling water outlet pipe of the three-stage condenser, and a second temperature indication and control alarm is installed on the pipe between the three-stage condenser and the feed inlet of the three-stage separator. The second temperature indication and control alarm is electrically connected to the second temperature control valve.

[0010] As a preferred technical solution, the ammonia condensate oil separator is equipped with a fourth pressure indicator control alarm, a third temperature indicator control alarm, and a fourth liquid level indicator control alarm, and the ammonia condensate conveying pipe is equipped with a fourth liquid level control valve, which is electrically connected to the fourth liquid level indicator control alarm.

[0011] The beneficial effects of this utility model are as follows:

[0012] This invention employs a three-stage liquid-liquid separation structure, which effectively improves the ammonia recovery rate through stepwise condensation and liquid separation. Compared with traditional single liquid-liquid separation systems, the ammonia recovery efficiency is significantly improved, ammonia loss is reduced, and efficient resource utilization is achieved.

[0013] This invention incorporates level, pressure, and temperature indicator alarms in each stage of the liquid separator, electrically connected to the corresponding control valves, achieving automated and precise control of level, pressure, and temperature. This ensures stable system operation, preventing equipment malfunctions and reduced ammonia recovery efficiency caused by level fluctuations, excessive pressure, or abnormal temperatures. It allows the system to operate under optimal conditions, reducing energy consumption and equipment wear.

[0014] This invention can effectively separate and recover ammonia from semi-coke wastewater. The efficient ammonia recovery reduces the load on subsequent wastewater treatment, lowers the overall treatment cost, and reduces the environmental pollution caused by ammonia emissions. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] The components include: 1. Crude ammonia gas transmission pipe; 2. Primary condenser; 3. First pressure indicator and control alarm; 4. First pressure control valve; 5. Secondary condenser; 6. First temperature control valve; 7. First temperature indicator and control alarm; 8. Secondary pressure indicator and control alarm; 9. Secondary separator; 10. Tertiary condenser; 11. Third pressure indicator and control alarm; 12. Secondary pressure control valve; 13. Tertiary separator; 14. Third liquid level indicator and control alarm; 15. Third liquid level control valve; 16. Secondary temperature indicator and control alarm; 17. ... 17. Second temperature control valve, 18. Second liquid level indicator and control alarm, 19. First liquid level indicator and control alarm, 20. Fourth pressure indicator and control alarm, 21. Third temperature indicator and control alarm, 22. Fourth liquid level indicator and control alarm, 23. Ammonia condensate conveying pipe, 24. Fourth liquid level control valve, 25. Ammonia condensate pump, 26. Ammonia condensate oil separator, 27. Light oil collection tank, 28. Ammonia condensate cooler, 29. First liquid level control valve, 30. Primary separator, 31. Raw material water conveying pipe, 32. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments, but the present invention is not limited to the following embodiments.

[0018] exist Figure 1 In this embodiment, the ammonia three-stage separation system for treating semi-coke wastewater has the following connections: the inlet A of the first-stage condenser 2 is connected to the crude ammonia gas transmission pipe 1, and the outlet A is connected to the feed inlet of the first-stage separation tank 31; the inlet B of the first-stage condenser 2 is connected to the raw water transmission pipe 32, and the outlet B is connected to the raw water inlet of the deammoniation tower.

[0019] The crude ammonia gas generated during the semi-coke wastewater treatment process enters the primary condenser 2 through the crude ammonia gas transmission pipe 1. The raw material wastewater to be deammoniated enters the primary condenser 2 through the raw material water transmission pipe 32. In the primary condenser 2, the crude ammonia gas and the raw material wastewater undergo initial contact and cooling. Due to the temperature decrease, some of the ammonia gas condenses into liquid ammonia, forming ammonia condensate. The condensed ammonia condensate and ammonia gas mixture flow into the primary separator tank 31 through outlet A of the primary condenser 2.

[0020] The bottom drain pipe of the primary separator 31 is connected to the inlet of the ammonia condensate cooler 29, and the top exhaust pipe is connected to the inlet of the secondary separator 9 via the secondary condenser 5. A first liquid level indicator and control alarm 20 is installed on the side wall of the primary separator 31, and a first pressure indicator and control alarm 3 is installed on the top. A first liquid level control valve 30 is installed on the bottom drain pipe of the primary separator 31. The first liquid level control valve 30 and the first liquid level indicator and control alarm 20 are electrically connected. When the first liquid level indicator and control alarm 20 detects that the liquid level in the primary separator 31 has reached the preset high liquid level, the first liquid level control valve 30 automatically opens, discharging the ammonia condensate to the ammonia condensate cooler 29 for cooling to prevent liquid overflow. When the liquid level drops to the preset low liquid level, the first liquid level control valve 30 automatically closes, stopping the discharge and ensuring that the liquid in the tank is maintained within a safe liquid level range.

[0021] A first pressure control valve 4 is installed on the vent pipe at the top of the primary separator 31. The first pressure control valve 4 is electrically connected to the first pressure indicator and control alarm 3. When the first pressure indicator and control alarm 3 detects that the pressure inside the primary separator 31 exceeds the preset safety upper limit, the first pressure control valve 4 automatically opens to discharge excess gas and ensure stable pressure inside the tank. When the pressure drops to the preset safety lower limit, the first pressure control valve 4 automatically closes to stop venting and ensure that the pressure inside the tank is maintained within a safe range.

[0022] In the primary separator 31, the ammonia condensate enters the ammonia condensate cooler 29, and the gas is further cooled by the secondary separator 5. During this process, more ammonia gas condenses into liquid, forming secondary ammonia condensate. The mixture of secondary ammonia condensate and uncooled ammonia gas flows into the secondary separator 9.

[0023] The bottom drain pipe of the secondary separator 9 is connected to the inlet of the ammonia condensate cooler 29, and the top exhaust pipe is connected to the feed port of the tertiary separator 13 through the tertiary condenser 10.

[0024] In the secondary separator 9, the ammonia condensate enters the ammonia condensate cooler 29, and the gas undergoes final cooling treatment through the tertiary condenser 10. At this stage, almost all the remaining ammonia gas is condensed into liquid to form tertiary ammonia condensate. The mixture of tertiary ammonia condensate and uncooled gas (mainly inert gas) flows into the tertiary separator 13.

[0025] A second liquid level indicator and control alarm 18 is installed on the side wall of the secondary liquid separator 9, and a second pressure indicator and control alarm 8 is installed on the top. A second liquid level control valve 19 is installed on the bottom drain pipe of the secondary liquid separator 9. The second liquid level control valve 19 and the second liquid level indicator and control alarm 18 are electrically connected. When the second liquid level indicator and control alarm 18 detects that the liquid level in the secondary liquid separator 9 reaches the preset high liquid level, the second liquid level control valve 19 automatically opens to discharge the liquid and prevent liquid overflow. When the liquid level drops to the preset low liquid level, the second liquid level control valve 19 automatically closes to stop discharging the liquid and ensure that the liquid in the tank is maintained within a safe liquid level range.

[0026] The second pressure indicator control alarm 8 is used to collect the pressure inside the secondary separator 9 in real time. When the pressure exceeds the set upper limit, an alarm is issued.

[0027] A first temperature control valve 6 is installed on the cooling water outlet pipe of the secondary condenser 5, and a first temperature indicator and control alarm 7 is installed on the pipe between the inlet of the secondary condenser 5 and the secondary separator 9. The first temperature indicator and control alarm 7 is electrically connected to the first temperature control valve 6. When the first temperature sensor detects that the cooling water temperature exceeds the preset upper limit, the opening of the first temperature control valve 6 automatically increases, increasing the cooling water flow rate and decreasing the cooling water temperature; when the temperature drops to the preset lower limit, the opening of the first temperature control valve 6 automatically decreases, reducing the cooling water flow rate and ensuring that the cooling water temperature is maintained within the set range.

[0028] The bottom drain pipe of the three-stage separator 13 and the outlet of the ammonia condensate cooler 29 are connected in parallel to the inlet of the ammonia condensate oil separator 27. The top exhaust pipe of the three-stage separator 13 is connected to the ammonia purification system. The oil outlet of the ammonia condensate oil separator 27 is connected to the light oil collection tank 28, and the drain outlet is connected to the ammonia condensate delivery pipe 24 through the ammonia condensate pump 26.

[0029] Uncondensed gas (mainly inert gas) in the three-stage separator 13 enters the ammonia purification system for further treatment through the top exhaust pipe of the three-stage separator 13. The ammonia condensate enters the ammonia condensate oil separator 27, where oil and water are separated. The separated light oil enters the light oil collection tank 28 through the oil drain for recycling. The ammonia condensate is then transported to the ammonia condensate delivery pipe 24 by the ammonia condensate pump 26 for use in subsequent processes.

[0030] A third liquid level indicator and control alarm 14 is installed on the side wall of the three-stage liquid separator 13, and a third pressure indicator and control alarm 11 is installed on the top. A third liquid level control valve 15 is installed on the bottom drain pipe of the three-stage liquid separator 13. The third liquid level control valve 15 is electrically connected to the third liquid level indicator and control alarm 14. When the third liquid level indicator and control alarm 14 detects that the liquid level in the three-stage liquid separator 13 reaches the preset high liquid level, the third liquid level control valve 15 automatically opens to discharge the liquid and prevent liquid overflow. When the liquid level drops to the preset low liquid level, the third liquid level control valve 15 automatically closes to stop discharging the liquid and ensure that the liquid in the tank is maintained within a safe liquid level range.

[0031] A second pressure control valve 12 is installed on the top vent pipe of the three-stage separator 13. The second pressure control valve 12 is electrically connected to the third pressure indicator and control alarm 11. When the third pressure indicator and control alarm 11 detects that the internal pressure of the three-stage separator 13 exceeds the preset safety upper limit, the second pressure control valve 12 automatically opens to discharge excess gas and ensure stable internal pressure. When the pressure drops to the preset safety lower limit, the second pressure control valve 12 automatically closes to stop venting and ensure that the internal pressure is maintained within a safe range.

[0032] A second temperature control valve 17 is installed on the cooling water outlet pipe of the tertiary condenser 10, and a second temperature indicator and control alarm 16 is installed on the pipe between the tertiary condenser 10 and the feed inlet of the tertiary separator 13. The second temperature indicator and control alarm 16 is electrically connected to the second temperature control valve 17. When the second temperature sensor detects that the cooling water temperature exceeds the preset upper limit, the opening of the second temperature control valve 17 automatically increases, increasing the cooling water flow rate and decreasing the cooling water temperature; when the temperature drops to the preset lower limit, the opening of the second temperature control valve 17 automatically decreases, reducing the cooling water flow rate and ensuring that the cooling water temperature is maintained within the set range.

[0033] The ammonia condensate oil separator 27 is equipped with a fourth pressure indicator and control alarm 21, a third temperature indicator and control alarm 22, and a fourth liquid level indicator and control alarm 23. The fourth pressure indicator and control alarm 21 and the third temperature indicator and control alarm 22 are used to collect the pressure within the ammonia condensate oil separator 27 in real time. When the pressure or temperature exceeds the set safety range, an alarm is triggered. A fourth liquid level control valve 25 is installed on the ammonia condensate delivery pipe 24, and the fourth liquid level control valve 25 is electrically connected to the fourth liquid level indicator and control alarm 23. The fourth liquid level indicator and control alarm 23 is used to collect the liquid level within the ammonia condensate oil separator 27 in real time. When the liquid level exceeds the set safety range, the fourth liquid level control valve 25 adjusts its opening, thereby adjusting the ammonia condensate delivery flow rate to ensure that the liquid level within the ammonia condensate oil separator 27 remains within the safe range.

Claims

1. A three-stage ammonia separation system for treating semi-coke wastewater, characterized in that: The inlet A of the primary condenser is connected to the crude ammonia gas transmission pipe, and the outlet A is connected to the feed inlet of the primary liquid separator. The inlet B of the primary condenser is connected to the raw water transmission pipe, and the outlet B is connected to the raw water inlet of the deammoniation tower. The bottom drain pipe of the primary liquid separator is connected to the inlet of the ammonia condensate cooler, and the top exhaust pipe is connected to the feed inlet of the secondary liquid separator through the secondary condenser. The bottom drain pipe of the secondary liquid separator is connected to the inlet of the ammonia condensate cooler, and the top exhaust pipe is connected to the feed inlet of the tertiary liquid separator through the tertiary condenser. The bottom drain pipe of the tertiary liquid separator and the outlet of the ammonia condensate cooler are connected in parallel to the inlet of the ammonia condensate oil separator. An exhaust pipe is installed at the top of the tertiary liquid separator. The oil outlet of the ammonia condensate oil separator is connected to the light oil collection tank, and the drain outlet is connected to the ammonia condensate transmission pipe through the ammonia condensate pump.

2. The ammonia three-stage separation system for treating semi-coke wastewater according to claim 1, characterized in that: The primary, secondary, and tertiary separating tanks are respectively equipped with a first liquid level indicator and control alarm, a second liquid level indicator and control alarm, and a third liquid level indicator and control alarm. A first liquid level control valve is installed on the bottom drain pipe of the primary separating tank, a second liquid level control valve is installed on the bottom drain pipe of the secondary separating tank, and a third liquid level control valve is installed on the bottom drain pipe of the tertiary separating tank. The first liquid level indicator and control alarm is electrically connected to the first liquid level control valve, the second liquid level indicator and control alarm is electrically connected to the second liquid level control valve, and the third liquid level indicator and control alarm is electrically connected to the third liquid level control valve.

3. The ammonia three-stage separation system for treating semi-coke wastewater according to claim 1, characterized in that: The top of the primary and tertiary separation tanks are respectively equipped with a first pressure indicator and control alarm, a second pressure indicator and control alarm, and a third pressure indicator and control alarm. A first pressure control valve is installed on the exhaust pipe at the top of the primary separation tank, and the first pressure control valve is electrically connected to the first pressure indicator and control alarm. A second pressure control valve is installed on the exhaust pipe at the top of the tertiary separation tank, and the second pressure control valve is electrically connected to the third pressure indicator and control alarm.

4. The ammonia three-stage separation system for treating semi-coke wastewater according to claim 1, characterized in that: A first temperature control valve is installed on the cooling water outlet pipe of the secondary condenser, and a first temperature indication and control alarm is installed on the pipe between the secondary condenser and the feed inlet of the secondary separator. The first temperature indication and control alarm is electrically connected to the first temperature control valve.

5. The ammonia three-stage separation system for treating semi-coke wastewater according to claim 1, characterized in that: A second temperature control valve is installed on the cooling water outlet pipe of the three-stage condenser, and a second temperature indicator and control alarm is installed on the pipe between the three-stage condenser and the feed inlet of the three-stage separator. The second temperature indicator and control alarm is electrically connected to the second temperature control valve.

6. The ammonia three-stage separation system for treating semi-coke wastewater according to claim 1, characterized in that: The ammonia condensate oil separator is equipped with a fourth pressure indicator and control alarm, a third temperature indicator and control alarm, and a fourth liquid level indicator and control alarm. The ammonia condensate delivery pipe is equipped with a fourth liquid level control valve, which is electrically connected to the fourth liquid level indicator and control alarm.

Images