Tail gas cooling treatment device for three-waste furnace

Abstract

The utility model belongs to the technical field of tail gas treatment, and particularly provides a three-waste furnace tail gas cooling treatment device which comprises a flue gas heat exchanger, tail gas discharged from a three-waste furnace is conveyed to the flue gas heat exchanger through a pipeline, and refrigerant demineralized water circularly flows in the flue gas heat exchanger to cool the tail gas. Tail gas flows through the flue gas heat exchanger and then is conveyed to the flue gas cooling tower through a gas inlet pipe, a cooling circulation water inlet pipe is connected into the flue gas cooling tower and provided with a nozzle, a cooling circulation water outlet pipe is arranged at the bottom of the flue gas cooling tower, and the tail gas flows through the flue gas cooling tower and then is exhausted from an exhaust pipe at the top of the flue gas cooling tower. The exhaust pipe is connected with the wet electric precipitator; and tail gas passes through the wet electric precipitator and then is discharged from a chimney at the top of the wet electric precipitator. According to the device, waste heat recycling and environment-friendly treatment are carried out on tail gas generated after combustion of the three-waste furnace, and the treated tail gas meets the emission requirement.

Description

Technical Field

[0001] The utility model relates to the technical field of tail gas treatment, and particularly relates to a device for cooling and treating the tail gas of a three-waste furnace. Background Art

[0002] For chemical and steel-making enterprises using coal or coking coal as raw materials, although they adopt a three-waste furnace to burn the released gas, blowing gas, and coal gas, and utilize the waste heat of the tail gas combustion to recover high-grade steam, the treatment of the tail gas after combustion has always been an unavoidable environmental protection issue in the industry. Chemical and steel-making enterprises using coal or coking coal as raw materials must deeply purify the tail gas before discharging it. Summary of the Invention

[0003] The technical problem to be solved by the utility model is to provide a device for cooling and treating the tail gas of a three-waste furnace, which can recycle the waste heat of the tail gas after combustion in the three-waste furnace and conduct environmental protection treatment, so that the treated tail gas meets the discharge requirements.

[0004] To solve the above technical problem, the technical solution adopted by the utility model is: a device for cooling and treating the tail gas of a three-waste furnace, including a flue gas heat exchanger. The tail gas discharged from the three-waste furnace is transported to the flue gas heat exchanger through a pipeline. The refrigerant desalted water circulates in the flue gas heat exchanger to cool the tail gas. After the tail gas flows through the flue gas heat exchanger, it is transported to the flue gas cooling tower through an inlet pipe. The cooling circulating water inlet pipe is connected to the inside of the flue gas cooling tower. A nozzle is provided on the cooling circulating water inlet pipe. A cooling circulating water outlet pipe is provided at the bottom of the flue gas cooling tower. After the tail gas flows through the flue gas cooling tower, it is discharged from the exhaust pipe at the top of the flue gas cooling tower. The exhaust pipe is connected to a wet electrostatic precipitator. After the tail gas passes through the wet electrostatic precipitator, it is discharged from the chimney at the top of the wet electrostatic precipitator.

[0005] In a preferred solution, a gas distributor is provided inside the flue gas cooling tower. The gas distributor is arranged above the air inlet of the flue gas cooling tower and below the cooling circulating water inlet pipe.

[0006] In a preferred solution, two groups of cooling circulating water inlet pipes are provided, and a pipeline filter is provided at the water inlet end of the cooling circulating water inlet pipe.

[0007] In a preferred solution, the cooling circulating water outlet pipe is a siphon drainage pipe.

[0008] In a preferred solution, regulating butterfly valves are provided on both the inlet pipe and the exhaust pipe.

[0009] In a preferred solution, a liquid level sensor is provided inside the flue gas cooling tower.

[0010] The device for cooling and treating the tail gas of a three-waste furnace provided by the utility model has the following beneficial effects:

[0011] 1. This device cools the tail gas discharged from the three-waste furnace twice, reducing its temperature to about 80°C, utilizes the waste heat of the tail gas, heats the demineralized water, reduces the steam consumption of other equipment, and achieves the effect of energy conservation and consumption reduction.

[0012] 2. Reduce the particulate matter and SO2 in the tail gas to the emission standards and meet the environmental protection requirements for tail gas emissions. Brief Description of the Drawings

[0013] The following further describes the present utility model in conjunction with the drawings and embodiments:

[0014] Figure 1 It is a schematic structural diagram of the present utility model;

[0015] In the figure: flue gas heat exchanger 1, inlet pipe 2, flue gas cooling tower 3, cooling circulation inlet pipe 4, nozzle 5, cooling circulation outlet pipe 6, exhaust pipe 7, wet electrostatic precipitator 8, chimney 9, gas distributor 10, pipeline filter 11, regulating butterfly valve 12, liquid level sensor 13. Detailed Embodiments

[0016] As Figure 1 shown, a three-waste furnace tail gas cooling treatment device includes a flue gas heat exchanger 1. The tail gas discharged from the three-waste furnace is transported to the flue gas heat exchanger 1 through a pipeline. The refrigerant demineralized water circulates in the flue gas heat exchanger 1 to cool the tail gas. In this embodiment, the refrigerant demineralized water is about 20°C. After the tail gas flows through the flue gas heat exchanger 1, it is transported to the flue gas cooling tower 3 through the inlet pipe 2. The cooling circulation inlet pipe 4 is connected to the inside of the flue gas cooling tower 3, and a nozzle 5 is provided on the cooling circulation inlet pipe 4. A cooling circulation outlet pipe 6 is provided at the bottom of the flue gas cooling tower 3. In this embodiment, the cooling circulation outlet pipe 6 is a siphon drain pipe, and a valve is provided on the cooling circulation outlet pipe 6. After the tail gas flows through the flue gas cooling tower 3, it is discharged from the exhaust pipe 7 at the top of the flue gas cooling tower 3. The exhaust pipe 7 is connected to the wet electrostatic precipitator 8, and the tail gas is discharged from the chimney 9 at the top of the wet electrostatic precipitator 8.

[0017] The tail gas at about 220°C discharged from the three-waste furnace passes through the flue gas heat exchanger 1, exchanges heat with the 20°C refrigerant demineralized water, heats the demineralized water, and after the tail gas is cooled, it enters the flue gas cooling tower 3 through the inlet pipe 2. After being cooled by spraying water from the nozzle 5 in the flue gas cooling tower 3, when the temperature of the tail gas drops to an appropriate level, the 80°C low-temperature tail gas enters the wet electrostatic precipitator 8. The wet electrostatic precipitator 8 mainly reduces the particulate matter and SO2 in the tail gas to the emission standards and discharges them up to the standard through the chimney 9.

[0018] Preferably, a gas distributor 10 is provided inside the flue gas cooling tower 3. The gas distributor 10 is arranged above the air inlet of the flue gas cooling tower 3 and below the cooling circulation inlet pipe 4.

[0019] Setting up the gas distributor 10 is conducive to the uniform distribution of gas in the flue gas cooling tower 3, which helps to cool down the tail gas.

[0020] Preferably, two groups of cooling circulating water inlet pipes 4 are provided. A pipeline filter 11 is provided at the water inlet end of the cooling circulating water inlet pipe 4. The pipeline filter 11 is an 80-mesh pipeline filter, which is used to filter impurities in the cooling water. By setting two groups of cooling circulating water inlet pipes 4, when one group is blocked, the other group can be fully opened without affecting the normal operation of the device. During specific use, a pressure sensor is provided on the cooling circulating water inlet pipe 4. When the pressure of a certain group of cooling circulating water inlet pipes 4 is lower than the pressure of the total inlet pipe, the water inflow of the cooling circulating water inlet pipe 4 of this group is appropriately increased, and this group of cooling circulating water inlet pipes 4 is separately closed. After cleaning the pipeline filter 11, it can be put into use again.

[0021] Preferably, a liquid level sensor 13 is provided in the flue gas cooling tower 3 and is electrically connected to the control system, which is convenient for local or remote control of the valve on the cooling circulating water outlet pipe 6 to prevent air leakage due to too low liquid level.

[0022] Adjusting butterfly valves 12 are provided on both the intake pipe 2 and the exhaust pipe 7, which are used to adjust the intake and exhaust volumes of the flue gas cooling tower 3.

[0023] During specific use, two groups of flue gas cooling towers 3 are provided and operate in parallel. The intake volume of the tail gas of each group of flue gas cooling towers 3 is adjusted through the adjusting butterfly valve 12 provided on the intake pipe 2. By opening and closing the adjusting butterfly valves 12 on the intake pipe 2 and the exhaust pipe 7 corresponding to each tower, they can operate separately to avoid the impact of device failures on environmental protection.

[0024] The working principle of this device is as follows:

[0025] Utilize the waste heat of the tail gas from the triple waste furnace. Through the flue gas heat exchanger 1, the 20°C refrigerant desalted water is heated to about 80°C, and the tail gas temperature of about 220°C is reduced to about 150°C. The hot desalted water at about 80°C is sent to other equipment that requires hot desalted water, such as a thermal deaerator, etc., reducing the steam consumption of other equipment and achieving the effect of energy conservation and consumption reduction. The tail gas at about 150°C enters the flue gas cooling tower 3. Through the gas distributor 10, the tail gas is evenly distributed in the tower and undergoes phase change heat exchange with the cooling water atomized by the nozzles 5 in the tower, further reducing the tail gas temperature to below 80°C, and at the same time reducing the particulate matter content in the tail gas. Then it enters the wet electrostatic precipitator 8, and the particulate matter in the tail gas is deeply purified through the electric field of the wet electrostatic precipitator 8, and reaches ultra-low emission through the chimney.

[0026] The cooling circulating water in the flue gas cooling tower 3, part of it enters the wet electrostatic precipitator 8 through phase change, and most of it is collected at the lower part of the flue gas cooling tower 3 and drained through the siphon phenomenon.

[0027] The above embodiments are only the preferred technical solutions of the present utility model, and should not be regarded as limitations on the present utility model. The embodiments in this application and the features in the embodiments can be arbitrarily combined with each other without conflict. The protection scope of the present utility model should be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, the equivalent replacement improvements within this scope are also within the protection scope of the present utility model.

Claims

1. A device for cooling and treating the tail gas of a three-waste furnace, characterized in that: It includes a flue gas heat exchanger (1). The tail gas discharged from the three-waste furnace is transported to the flue gas heat exchanger (1) through a pipeline. The circulating refrigerant desalted water in the flue gas heat exchanger (1) cools the tail gas. After the tail gas flows through the flue gas heat exchanger (1), it is transported to the flue gas cooling tower (3) through the inlet pipe (2). The cooling circulating water inlet pipe (4) is connected to the inside of the flue gas cooling tower (3). A nozzle (5) is provided on the cooling circulating water inlet pipe (4). A cooling circulating water outlet pipe (6) is provided at the bottom of the flue gas cooling tower (3). After the tail gas flows through the flue gas cooling tower (3), it is discharged from the exhaust pipe (7) at the top of the flue gas cooling tower (3). The exhaust pipe (7) is connected to the wet electrostatic precipitator (8). After the tail gas passes through the wet electrostatic precipitator (8), it is discharged from the chimney (9) at the top of the wet electrostatic precipitator (8).

2. The waste heat treatment device for the tail gas of a triple-waste furnace according to claim 1, wherein: A gas distributor (10) is provided inside the flue gas cooling tower (3). The gas distributor (10) is arranged above the air inlet of the flue gas cooling tower (3) and below the cooling circulating water inlet pipe (4).

3. The waste heat treatment device for the tail gas of a triple-waste furnace according to claim 1, wherein: Two groups of the cooling circulating water inlet pipes (4) are provided. A pipeline filter (11) is provided at the water inlet end of the cooling circulating water inlet pipe (4).

4. A three-waste furnace tail gas cooling and treatment device according to claim 1, characterized in that: The cooling circulating water outlet pipe (6) is a siphon drainage pipe.

5. A waste heat boiler tail gas cooling and treatment device according to claim 1, characterized in that: Adjusting butterfly valves (12) are provided on both the inlet pipe (2) and the exhaust pipe (7).

6. The tail gas temperature reduction treatment device for a three-waste furnace according to claim 1, characterized in that: A liquid level sensor (13) is provided inside the flue gas cooling tower (3).

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