Low-energy-consumption liquid ammonia recovery system for semi-coke wastewater treatment

Abstract

A low-energy-consumption liquid ammonia recovery system for semi-coke wastewater treatment is characterized in that an inlet A of an ammonia rectification heat exchanger is connected with a dilute ammonia water conveying pipe, an outlet A is connected with a liquid inlet of an ammonia rectification tower, an inlet B is connected with a bottom kettle liquid outlet of the ammonia rectification tower, and an outlet B is connected with a liquid inlet of an ammonia rectification kettle liquid cooler; a liquid outlet of the ammonia rectification still liquid cooler is connected with a waste liquid conveying pipe, a gas outlet in the top of the ammonia rectification tower is connected with a gas inlet of the ammonia rectification cooler through a gas conveying pipeline, and a liquid outlet of the ammonia rectification cooler is connected with a liquid inlet of the liquid ammonia storage tank through a pipeline. A liquid outlet A of the liquid ammonia storage tank is connected with a liquid ammonia inlet of the ammonia rectifying tower through a liquid ammonia reflux pump set, and a liquid outlet B of the liquid ammonia storage tank is connected with a liquid ammonia delivery pump set. Heat exchange between dilute ammonia water and kettle liquid is achieved through the ammonia rectification heat exchanger, waste heat in the system is fully utilized, and energy consumption needed by external heating is reduced. And the preheated dilute ammonia water enters the rectifying tower, so that the heating load in the tower is reduced, and the energy consumption of the system is obviously reduced.

Description

Technical Field

[0001] This utility model belongs to the technical field of wastewater treatment equipment, specifically relating to a low-energy liquid ammonia recovery system for treating semi-coke wastewater. Background Technology

[0002] With the acceleration of industrialization, the wastewater treatment of semi-coke production, as an important energy and chemical industry, has received increasing attention. Semi-coke wastewater has a complex composition, containing large amounts of pollutants such as ammonia nitrogen, phenols, and cyanides. If not effectively treated, it can cause serious environmental pollution. Among these, the recovery and treatment of ammonia nitrogen is one of the key aspects of semi-coke wastewater treatment.

[0003] In traditional liquid ammonia recovery systems, dilute ammonia water is preheated by a preheater equipped with a steam coil before entering the distillation column for distillation. The high-temperature waste liquid discharged from the distillation column directly exchanges heat with cooling water to reduce the temperature of the waste liquid. Therefore, traditional liquid ammonia recovery systems are energy-intensive and economical. There is an urgent need for a low-energy liquid ammonia recovery system. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a low-energy liquid ammonia recovery system for treating semi-coke wastewater with high treatment efficiency.

[0005] The technical solution adopted to solve the above-mentioned technical problems is: a low-energy liquid ammonia recovery system for treating semi-coke wastewater, wherein the inlet A of the ammonia distillation heat exchanger is connected to a dilute ammonia water conveying pipe, the outlet A is connected to the liquid inlet of the ammonia distillation tower, the inlet B is connected to the bottom liquid outlet of the ammonia distillation tower, the outlet B is connected to the liquid inlet of the ammonia distillation tank cooler, the liquid outlet of the ammonia distillation tank cooler is connected to a waste liquid conveying pipe, the gas outlet at the top of the ammonia distillation tower is connected to the gas inlet of the ammonia distillation cooler through a gas conveying pipe, the liquid outlet of the ammonia distillation cooler is connected to the liquid inlet of the liquid ammonia storage tank through a pipe, the liquid outlet A of the liquid ammonia storage tank is connected to the liquid ammonia inlet of the ammonia distillation tower through a liquid ammonia reflux pump group, and the liquid outlet B is connected to the liquid ammonia external delivery pump group.

[0006] As a preferred technical solution, a liquid level indicator and control alarm is installed on the lower side wall of the ammonia distillation column, and a liquid level control valve is installed on the waste liquid conveying pipe. The liquid level control valve is electrically connected to the liquid level indicator and control alarm.

[0007] As a preferred technical solution, a pressure indicator and control alarm is installed at the top of the ammonia distillation tower, and a pressure control valve is installed on the gas transmission pipeline. The pressure control valve is electrically connected to the pressure indicator and control alarm.

[0008] As a preferred technical solution, a temperature indicator and control alarm is installed on the pipeline between the outlet of the ammonia distillation cooler and the inlet of the liquid ammonia storage tank, and a temperature control valve is installed on the cooling water output pipe of the ammonia distillation cooler. The temperature indicator and control alarm is electrically connected to the temperature control valve.

[0009] The beneficial effects of this utility model are as follows:

[0010] This invention utilizes an ammonia distillation heat exchanger to achieve heat exchange between dilute ammonia water and the reactor liquid, fully utilizing the waste heat within the system and reducing the energy consumption required for external heating. The preheated dilute ammonia water enters the distillation column, reducing the heating load within the column and thus significantly reducing the system's energy consumption.

[0011] The installation of level indicator control alarm, pressure indicator control alarm, and temperature indicator control alarm enables real-time monitoring of key system parameters and linkage with level control valve, pressure control valve, and temperature control valve respectively, ensuring the stability and safety of system operation, reducing manual intervention, and lowering operational risks.

[0012] This invention reduces energy consumption and improves resource recovery rate, thereby reducing equipment operating costs and bringing significant economic benefits to enterprises. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] The components include: 1. Ammonia distillation heat exchanger; 2. Pressure control valve; 3. Pressure indicator and control alarm; 4. Ammonia distillation cooler; 5. Temperature control valve; 6. Temperature indicator and control alarm; 7. Liquid ammonia storage tank; 8. Liquid ammonia external pump group; 9. Liquid ammonia reflux pump group; 10. Ammonia distillation tower; 11. Liquid level indicator and control alarm; 12. Waste liquid conveying pipe; 13. Ammonia distillation kettle liquid cooler; 14. Dilute ammonia water conveying pipe; and 15. Liquid level control valve. Detailed Implementation

[0015] 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.

[0016] exist Figure 1 In this embodiment, the low-energy liquid ammonia recovery system for treating semi-coke wastewater has a dilute ammonia water delivery pipe 14 connected to the inlet A of the ammonia distillation heat exchanger 1, an outlet A connected to the liquid inlet of the ammonia distillation column 10, an inlet B connected to the bottom liquid outlet of the ammonia distillation column 10, and an outlet B connected to the liquid inlet of the ammonia distillation bottom liquid cooler 13.

[0017] Dilute ammonia water exchanges heat with the bottom liquid discharged from the bottom of the ammonia distillation column 10 in the ammonia distillation heat exchanger 1, absorbing heat from the bottom liquid to achieve preheating. After preheating, the dilute ammonia water enters the inlet of the ammonia distillation column 10 through outlet A, ready for distillation separation. The increased temperature of the preheated dilute ammonia water reduces the energy required for subsequent heating. The pre-cooled waste liquid enters the ammonia distillation bottom liquid cooler 13 for further cooling.

[0018] The outlet of the ammonia distillation kettle liquid cooler 13 is connected to the waste liquid conveying pipe 12. A liquid level control valve 15 is installed on the waste liquid conveying pipe 12. A liquid level indicator and control alarm 11 is installed on the lower side wall of the ammonia distillation column 10 to monitor the liquid level in the column in real time. The liquid level control valve 15 is electrically connected to the liquid level indicator and control alarm 11. The waste liquid discharge is automatically adjusted according to the signal of the liquid level indicator and control alarm 11 to prevent the liquid level in the column from being too high or too low.

[0019] The outlet at the top of the ammonia distillation column 10 is connected to the inlet of the ammonia distillation cooler 4 via a gas pipeline. The ammonia gas escaping from the top of the ammonia distillation column 10 is cooled and liquefied in the ammonia distillation cooler 4 to form liquid ammonia. A pressure control valve 2 is installed on the gas pipeline, and a pressure indicating and control alarm 3 is installed at the top of the ammonia distillation column 10 to collect the pressure inside the ammonia distillation column 10 in real time. The pressure control valve 2 is electrically connected to the pressure indicating and control alarm 3, and the ammonia gas discharge is automatically adjusted according to the signal from the pressure indicating and control alarm 3 to ensure the safe operation of the system.

[0020] The outlet of the ammonia distillation cooler 4 is connected to the inlet of the liquid ammonia storage tank 7 via a pipe. Liquid ammonia enters the liquid ammonia storage tank 7 through the pipe. A temperature indicator and control alarm 6 is installed on this pipe. A temperature control valve 5 is installed on the cooling water output pipe of the ammonia distillation cooler 4. The temperature indicator and control alarm 6 is electrically connected to the temperature control valve 5. This is used to automatically adjust the cooling water temperature to ensure the cooling effect of the liquid ammonia.

[0021] The outlet A of the liquid ammonia storage tank 7 is connected to the liquid ammonia inlet of the ammonia distillation column 10 through the liquid ammonia reflux pump group 9. Part of the liquid ammonia is refluxed back to the distillation column to adjust the liquid level or temperature in the column and optimize the distillation process.

[0022] The liquid ammonia outlet B of the liquid ammonia storage tank 7 outputs liquid ammonia through the liquid ammonia external pump group 8 for subsequent use.

Claims

1. A low-energy-consumption liquid ammonia recovery system for treating semi-coke wastewater, characterized in that: The ammonia distillation heat exchanger has a dilute ammonia water delivery pipe connected to inlet A, an outlet A connected to the liquid inlet of the ammonia distillation column, an inlet B connected to the bottom liquid outlet of the ammonia distillation column, an outlet B connected to the liquid inlet of the ammonia distillation kettle cooler, a liquid outlet of the ammonia distillation kettle cooler connected to a waste liquid delivery pipe, a gas outlet at the top of the ammonia distillation column connected to the gas inlet of the ammonia distillation cooler via a gas delivery pipe, a liquid outlet of the ammonia distillation cooler connected to the liquid inlet of the liquid ammonia storage tank via a pipe, a liquid outlet A of the liquid ammonia storage tank connected to the liquid ammonia inlet of the ammonia distillation column via a liquid ammonia reflux pump set, and a liquid outlet B connected to a liquid ammonia external delivery pump set.

2. The low-energy liquid ammonia recovery system for semi-coke wastewater treatment according to claim 1, characterized in that: A liquid level indicator and control alarm is installed on the lower side wall of the ammonia distillation column, and a liquid level control valve is installed on the waste liquid conveying pipe. The liquid level control valve is electrically connected to the liquid level indicator and control alarm.

3. The low-energy liquid ammonia recovery system for semi-coke wastewater treatment according to claim 1, characterized in that: A pressure indicator and control alarm is installed at the top of the ammonia distillation tower, and a pressure control valve is installed on the gas transmission pipeline. The pressure control valve is electrically connected to the pressure indicator and control alarm.

4. The low-energy liquid ammonia recovery system for semi-coke wastewater treatment according to claim 1, characterized in that: A temperature indicator and control alarm is installed on the pipeline between the outlet of the ammonia distillation cooler and the inlet of the liquid ammonia storage tank. A temperature control valve is installed on the cooling water output pipe of the ammonia distillation cooler. The temperature indicator and control alarm is electrically connected to the temperature control valve.

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