Ammonia gas absorption system for semi-coke wastewater treatment

Abstract

An ammonia gas absorption system for semi-coke wastewater treatment is characterized in that an ammonia gas inlet of an ammonia gas absorber is connected with an ammonia gas inlet pipe, an absorption tower is connected with a nitrogen gas inlet pipe, a desalted water inlet pipe and an exhaust pipe, and a liquid outlet is connected with a liquid inlet of an ammonia water tank through a pipeline; a liquid outlet of the ammonia water tank is connected with an ammonia water pipe network through a dilute ammonia water pump group; a gas outlet pipe is connected with an absorption tower of an ammonia gas absorber; a first flow sensor is arranged on the ammonia gas inlet pipe, a second flow sensor and a flow control valve are sequentially arranged on the desalted water inlet pipe in the flowing direction, and the first flow sensor and the second flow sensor are electrically connected with the flow control valve; the ammonia absorber is provided with a pressure display interlocking alarm, the nitrogen inlet pipe is connected with a first pressure control valve, the exhaust pipe is connected with a second pressure control valve, and the first pressure control valve and the second pressure control valve are electrically connected with the pressure display interlocking alarm. The ammonia absorption system has the advantages of safe and reliable operation and high ammonia absorption efficiency.

Description

TECHNICAL FIELD

[0001] The utility model belongs to wastewater treatment technical field, specifically relates to a kind of ammonia gas absorption system for coking waste water treatment. BACKGROUND

[0002] Coking wastewater is mainly generated in the production process of coking wastewater, which contains high concentrations of organic matter, ammonia nitrogen, phenolic and other harmful substances. In order to effectively treat these wastewater, it is usually necessary to go through several steps such as pretreatment, biochemical treatment, advanced treatment, etc. One of the key tasks in the pretreatment stage is to remove ammonia nitrogen from wastewater, and one of the effective means to achieve this goal is to condense ammonia gas into ammonia water and collect it.

[0003] Chinese patent application No. 202122902789.8, entitled "Ammonia gas absorption device and ammonia gas absorption system for ammonia water storage tank" discloses an ammonia gas absorption device and ammonia gas absorption system for ammonia gas storage tank. The cylinder and ammonia distribution pipe group are composed of ammonia tail gas distribution main pipe and ammonia tail gas distribution branch pipe. The ammonia tail gas distribution main pipe is placed in the cylinder with the bottom of the ammonia liquid surface below, and the other end is the ammonia tail gas inlet. Several ammonia tail gas distribution branch pipes extend to the edge of the cylinder and form an ammonia tail gas discharge surface for discharging ammonia tail gas to the bottom of the cylinder. However, due to the location of the ammonia distribution pipe group in the cylinder and the involvement of multiple branch pipes, maintenance and repair may be difficult, and regular cleaning and inspection of the internal pipe are required to prevent blockage or corrosion. The device mainly addresses the problem of short-term large exhaust during ammonia water unloading, and may not be suitable for other types of ammonia gas discharge scenarios. For different concentrations of ammonia gas discharge, the concentration and discharge rate of ammonia liquid may need to be adjusted, which increases the complexity of operation. SUMMARY

[0004] The utility model overcomes the shortcomings of the prior art and provides an ammonia gas absorption system for coking wastewater treatment with low energy consumption and high treatment efficiency.

[0005] The technical scheme adopted to solve the above technical problems is: an ammonia gas absorption system for semi-coke wastewater treatment, an ammonia gas inlet pipe is connected to an ammonia gas inlet of an ammonia gas absorber, a nitrogen gas inlet pipe and a desalted water inlet pipe and an exhaust pipe are connected to an absorption tower of the ammonia gas absorber, a liquid outlet of the ammonia gas absorber is connected to an ammonia water tank through a pipeline, a liquid outlet of the ammonia water tank is connected to an ammonia water pipe network through a dilute ammonia water pump group, and an exhaust pipe is connected to the absorption tower of the ammonia gas absorber; a first flow sensor is arranged on the ammonia gas inlet pipe, a second flow sensor and a flow control valve are arranged on the desalted water inlet pipe in sequence along a flow direction, and the first flow sensor and the second flow sensor are electrically connected with the flow control valve; a pressure display interlocking alarm is arranged on the ammonia gas absorber, a first pressure control valve is connected to the nitrogen gas inlet pipe, and a second pressure control valve is connected to the exhaust pipe, and the first pressure control valve and the second pressure control valve are electrically connected with the pressure display interlocking alarm.

[0006] As a preferred technical scheme, a liquid level indication control alarm is arranged on the ammonia water tank, a liquid level control valve is arranged between the dilute ammonia water pump group and the ammonia water pipe network, and the liquid level control valve is electrically connected with the liquid level indication control alarm.

[0007] As a preferred technical scheme, a pressure reducing pipe is arranged between an upstream side of the liquid level control valve and a downstream side of the flow control valve, and a gate valve is arranged on the pressure reducing pipe.

[0008] As a preferred technical scheme, a pressure gauge is arranged on the ammonia water tank.

[0009] As a preferred technical scheme, a pressure gauge is arranged on an output side of the dilute ammonia water pump group.

[0010] The beneficial effects of the utility model are as follows:

[0011] The utility model discloses a nitrogen gas is passed in the absorption tower, and the bubble produced plays the stirring action to desalted water, makes desalted water and ammonia gas can fully contact, increases the contact area of ammonia gas and desalted water, makes more ammonia gas be converted into ammonia water, thereby improve the absorption efficiency of ammonia gas.

[0012] The electric connection of the pressure display interlocking alarm and the pressure control valve and the timely supplement of nitrogen gas jointly maintain the stability of system pressure. This not only provides a stable environment for ammonia gas absorption, avoids unstable absorption effect caused by excessive pressure fluctuation, prevents equipment damage caused by abnormal pressure, and guarantees long-term stable operation of the system.

[0013] The connection of the dilute ammonia water pump group and the ammonia water pipe network realizes the recycling of ammonia water and is suitable for long-term ammonia gas recovery of the semi-coke wastewater treatment system. ACCURACY

[0014] Figure 1 is a structural schematic view of the utility model.

[0015] Among them, nitrogen gas inlet pipe 1, ammonia gas inlet pipe 2, first pressure control valve 3, second pressure control valve 4, exhaust pipe 5, second flow sensor 6, desalted water inlet pipe 7, gas outlet pipe 8, ammonia gas absorber 9, pressure reducing pipe 10, liquid level indication control alarm 11, ammonia water pipe network 12, dilute ammonia water pump set 13, ammonia water tank 14, pressure display interlock alarm 15, first flow sensor 16, flow control valve 17, liquid level control valve 18, second pressure gauge 19, first pressure gauge 20. DETAILED DESCRIPTION

[0016] The utility model is further explained in detail below in combination with the drawings and examples, but the utility model is not limited to the following implementation.

[0017] In Figure 1 , the utility model discloses a coke breeze wastewater treatment for ammonia gas absorption system, ammonia gas inlet pipe 2 is connected on the ammonia gas inlet of ammonia gas absorber 9, nitrogen gas inlet pipe 1 and desalted water inlet pipe 7 and exhaust pipe 5 are connected on the absorption tower, the liquid outlet is connected with ammonia water tank 14 liquid inlet through pipeline, the circulating water inlet pipe and backwater pipe are connected on the ammonia gas absorber for adjusting the temperature in ammonia gas absorber.Nitrogen gas is passed into the absorption tower of ammonia gas absorber 9 through nitrogen gas inlet pipe 1, is used for discharging the air in the absorption tower, forms the protective atmosphere, effectively prevents ammonia water and oxygen contact, avoids ammonia water to be oxidized and deteriorated.Ammonia gas from ammonia gas purification tower enters ammonia gas absorber 9 through ammonia gas inlet pipe 2, contacts with the desalted water in the absorption tower, and ammonia gas is absorbed to form ammonia water by desalted water.

[0018] The liquid outlet of ammonia water tank 14 is connected with ammonia water pipe network 12 through dilute ammonia water pump set 13, and the gas outlet pipe 8 is connected with the absorption tower of ammonia gas absorber 9, and the dilute ammonia water pump set 13 transports ammonia water in ammonia water tank 14 to ammonia water pipe network 12, wherein a small amount of ammonia gas generated backflows into the absorption tower of ammonia gas absorber 9.

[0019] First pressure gauge 20 is installed on ammonia water tank 14, for real-time monitoring the pressure in ammonia water tank 14, and second pressure gauge 19 is arranged on the output side of dilute ammonia water pump set 13, for real-time monitoring the pressure of output dilute ammonia water.

[0020] The first flow sensor 16 is installed on the ammonia gas inlet pipe 2 to monitor the flow of ammonia gas in real time. The second flow sensor 6 and the flow control valve 17 are installed on the desalted water inlet pipe 7 along the flow direction in sequence. The second flow sensor 6 is used to monitor the flow of desalted water in real time. The first flow sensor 16 and the second flow sensor 6 are electrically connected with the flow control valve 17. The flow control valve 17 automatically adjusts the opening degree according to the feedback signal of the flow sensor to ensure that the flow of ammonia gas and desalted water is within the appropriate range, thereby ensuring the absorption effect.

[0021] The pressure display interlocking alarm 15 is installed on the ammonia gas absorber 9. The first pressure control valve 3 is connected to the nitrogen gas inlet pipe 1, and the second pressure control valve 4 is connected to the exhaust pipe 5. In the normal operating state, the second pressure control valve 4 is in the closed state. The first pressure control valve 3 and the second pressure control valve 4 are electrically connected with the pressure display interlocking alarm 15. When the system pressure reaches the lower limit, the opening degree of the first pressure control valve 3 is adjusted to maintain stable pressure. If the pressure exceeds the set range, the pressure display interlocking alarm 15 will issue a warning and open the second pressure control valve 4.

[0022] The liquid level indication control alarm 11 is installed on the ammonia water tank 14 of the embodiment to monitor the liquid level in the ammonia water tank 14 in real time. When the liquid level is too high or too low, an alarm is issued. The liquid level control valve 18 is installed between the dilute ammonia water pump group 13 and the ammonia water pipe network 12. The liquid level control valve 18 is electrically connected with the liquid level indication control alarm 11. The opening degree of the liquid level control valve 18 is adjusted according to the liquid level signal to control the liquid level of the ammonia water tank 14 within the normal range.

[0023] The pressure reducing pipe 10 is installed between the upstream side of the liquid level control valve 18 and the downstream side of the flow control valve 17. The gate valve is installed on the pressure reducing pipe 10. When the pressure detected by the pressure gauge on the output side of the dilute ammonia water pump group 13 exceeds the normal operating pressure, the gate valve is opened to allow part of the dilute ammonia water to enter the desalted water inlet pipe 7 through the pressure reducing pipe 10 and then enter the ammonia gas absorber 9. This reduces the pressure on the output side of the dilute ammonia water pump group 13, thereby playing a pressure reducing role. This ensures stable operation of the system and reduces waste of water resources, thereby improving the comprehensive utilization rate of resources.

Claims

1. A system for absorbing ammonia gas from a semi-coke wastewater treatment, characterized by: The ammonia gas inlet pipe is provided with a first flow sensor, the desalted water inlet pipe is provided with a second flow sensor and a flow control valve along the flow direction in sequence, and the first flow sensor and the second flow sensor are electrically connected with the flow control valve; the ammonia gas absorber is provided with a pressure display interlocking alarm, the nitrogen gas inlet pipe is connected with a first pressure control valve, the exhaust pipe is connected with a second pressure control valve, and the first pressure control valve and the second pressure control valve are electrically connected with the pressure display interlocking alarm.

2. The ammonia absorption system for treating semicoke wastewater according to claim 1, wherein: The ammonia water tank is provided with a liquid level indication control alarm, a liquid level control valve is arranged between the dilute ammonia water pump group and the ammonia water pipe network, and the liquid level control valve is electrically connected with the liquid level indication control alarm.

3. The ammonia absorption system for treating the semi-coke wastewater according to claim 2, characterized in that: A pressure reducing pipe is arranged between the upstream side of the liquid level control valve and the downstream side of the flow control valve, and a gate valve is arranged on the pressure reducing pipe.

4. The ammonia absorption system for treating semicoke wastewater according to claim 1, wherein: A pressure gauge is arranged on the ammonia water tank.

5. The ammonia absorption system for treating the semi-coke wastewater according to claim 1, wherein: A pressure gauge is arranged on the output side of the dilute ammonia water pump group.

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