Waste gas blending combustion system

Abstract

The utility model relates to a chemical waste gas treatment device, in particular to a waste gas blending combustion system which comprises a waste gas conveying pipeline system, a boiler system and a hot secondary air pipeline system, the boiler system comprises a boiler and a combustor arranged in a hearth of the boiler, and the output end of the hot secondary air pipeline system is communicated with the combustor. The output end of the waste gas conveying pipeline system is communicated with the hot secondary air pipeline system, and an emptying pipeline, a sampling pipeline, an overflow pipeline, a water inlet pipeline and a water drainage pipeline are connected in parallel. According to the system, chemical waste gas can be directly fed into the coal-fired boiler for combustion, the chemical waste gas is mixed into the hot secondary air system, a special combustor does not need to be additionally arranged, direct emission of the chemical waste gas is avoided, and environmental protection is facilitated. Meanwhile, combustible components in the chemical waste gas can release heat, use of coal in the boiler is reduced, and the purpose of saving energy is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a chemical waste gas treatment device, specifically is a waste gas mixed combustion system. BACKGROUND

[0002] The attached matter produced in various processes of chemical production device, especially waste gas etc., such as the waste gas produced by cracking gasoline hydrogenation device contains about O2: 15vol%, N2: 75vol%, CO: 1vol%, CO2: 3vol%, hydrocarbon: 0~0.9vol%(Max), water vapor: 5vol%, SO2: ≤380mg / Nm3, these waste gases are difficult to recycle and utilize, and are not easy to handle, if directly venting, will cause huge pollution to the environment, therefore how to utilize the waste gas in chemical production reasonably is the problem that current is urgent to solve. SUMMARY

[0003] In order to solve the problem of the above waste gas treatment, the utility model provides a waste gas mixed combustion system, the chemical waste gas is conveyed to the boiler hearth by pipeline and is combusted, the environmental pollution problem caused by direct venting is avoided, and the technical scheme adopted by the utility model is as follows:

[0004] A waste gas mixed combustion system, including waste gas delivery pipeline system, boiler system and hot secondary air pipeline system, the boiler system includes boiler and the burner arranged in the hearth thereof, the output end of the hot secondary air pipeline system is communicated with the burner, and the output end of the waste gas delivery pipeline system is communicated with the hot secondary air pipeline system.

[0005] A manual butterfly valve, a pressure regulating valve, an electric cut-off valve, a filter, a flowmeter B, a pressure gauge, a pneumatic regulating ball valve and a pneumatic ball valve are sequentially arranged on the pipeline of the waste gas delivery pipeline system, a baffle is arranged at the end of the pipeline of the waste gas delivery pipeline system, a venting pipeline is connected in parallel at the input side of the pressure gauge and the output side of the pneumatic ball valve, a sampling pipeline is connected in parallel at the output side of the flowmeter B and the output side of the pneumatic ball valve, an overflow pipeline, a water inlet pipeline and a water outlet pipeline are connected in parallel at the output side of the electric cut-off valve, and the hot secondary air pipeline system is communicated with the output side of the pneumatic ball valve.

[0006] The waste gas delivery pipeline system further includes a nitrogen protection pipeline, the nitrogen protection pipeline is provided with two branches connected in parallel, one branch is connected to the input side of the filter, the other branch is communicated with the output side of the pneumatic ball valve, and a manual ball valve and a swing-type check valve are arranged on the pipelines of the two branches.

[0007] The waste gas mixed combustion system is provided with a temporary pipeline between the input side of the filter and the output side of the flowmeter B, and a manual ball valve is arranged on the temporary pipeline.

[0008] The waste gas mixing combustion system, the hot secondary air pipeline system has two sets of air blowers, two sets of air preheaters and air blow pipelines, the air blowers are in one-to-one correspondence with the air preheaters, the air preheaters are connected to the air blow pipelines respectively, and the ends of the air blow pipelines are connected to the burners.

[0009] The waste gas mixing combustion system, the boiler is provided with a leak detector.

[0010] The system can directly send the chemical waste gas into the coal-fired boiler for combustion, the chemical waste gas is mixed into the hot secondary air system, a special burner does not need to be additionally arranged, direct discharge of the chemical waste gas is avoided, and environmental protection is favorable. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 A pipeline setting schematic view of the embodiment of the utility model is shown.

[0012] In the figure, 1 is a boiler, 2 is a burner, 3 is an air preheater, 4 is an air blower, 5 is a leak detector, 6 is a flowmeter A, 7 is a manual butterfly valve, 8 is a pressure regulating valve, 9 is an electric cut-off valve, 10 is a filter, 11 is a flowmeter B, 12 is a pressure gauge, 13 is a pneumatic regulating ball valve, 14 is a pneumatic ball valve, 15 is a swing check valve, and 16 is a baffle. DETAILED DESCRIPTION

[0013] The technical scheme of the utility model will be described in detail below with reference to the drawings.

[0014] The utility model discloses a waste gas mixing combustion system, including waste gas delivery pipeline system, boiler system and hot secondary air pipeline system, the boiler system includes the boiler 1 and the furnace in the configuration burner 2 of it, the output of hot secondary air pipeline system is connected with burner 2, the output of waste gas delivery pipeline system is connected with hot secondary air pipeline system.

[0015] The boiler 1 is provided with a leak detector 5, which is used for monitoring the content of chemical waste gas in the boiler system area, and can be installed on the operation layer of the boiler 1. The probe has 20 probes that can be arranged on each layer of the boiler, and two movable probes. The signal is connected to DCS. The installation and use of the leak detector 5 are prior art, and will not be described in detail here.

[0016] Specifically, the pipeline of the waste gas conveying pipeline system is sequentially provided with a manual butterfly valve 7, a pressure regulating valve 8, an electric cut-off valve 9, a filter 10, a flow meter B 11, a pressure gauge 12, a pneumatic regulating ball valve 13 and a pneumatic ball valve 14, the end of the pipeline of the waste gas conveying pipeline system is provided with a baffle 16, the input side of the pressure gauge 12 and the output side of the pneumatic ball valve 14 are respectively connected in parallel with a venting pipeline, the output side of the flow meter B 11 and the output side of the pneumatic ball valve 14 are respectively connected in parallel with a sampling pipeline, the output side of the electric cut-off valve 9 is connected in parallel with an overflow pipeline, a water inlet pipeline and a water outlet pipeline, and the output side of the pneumatic ball valve 14 is connected with a hot secondary air pipeline system. Figure 1 A manual ball valve (the valve bodies not marked in the figure are all manual ball valves) can be arranged at a suitable position on the waste gas conveying pipeline system to ensure safe operation of the pipeline.

[0017] At present, the pressure of the chemical waste gas is about 300 KPa, which is too high. In order to ensure safe combustion, the chemical waste gas sent into the boiler 1 must be adjusted in pressure before being sent into the furnace for combustion to ensure safety. The pressure regulating valve 8 is used to adjust the pressure of the chemical waste gas, and the pneumatic regulating ball valve 13 is used to adjust the flow.

[0018] The waste gas conveying pipeline system is also provided with a nitrogen protection pipeline to provide nitrogen protection. The nitrogen protection pipeline is provided with two branches connected in parallel, one branch is connected to the input side of the filter 10, and the other branch is connected to the output side of the pneumatic ball valve 14. Manual ball valves and swing-type check valves 15 are installed on the pipelines of the two branches.

[0019] A temporary pipeline is arranged between the input side of the filter 10 and the output side of the flow meter B 11. The temporary pipeline is provided with a manual ball valve. In this way, when the filter 10 or the flow meter B 11 needs to be repaired or replaced, the system does not need to be shut down, but only needs to be started up.

[0020] The hot secondary air pipeline system includes two groups of air blowers 4, two groups of air preheaters 3 and an air supply pipeline. The air blowers 4 and the air preheaters 3 are connected in one-to-one correspondence. The air preheaters 3 are respectively connected to the air supply pipeline. The end of the air supply pipeline is connected to the burner 2 and should be as close to the furnace of the burner 2 as possible. The air supply pipeline is provided with a flow meter A 6.

Claims

1. A waste gas co-firing system, characterized in that: It includes an exhaust gas conveying pipeline system, a boiler system and a hot secondary air pipeline system. The boiler system includes a boiler (1) and a burner (2) configured inside the furnace. The output end of the hot secondary air pipeline system is connected to the burner (2). The output end of the exhaust gas conveying pipeline system is connected to the hot secondary air pipeline system. The exhaust gas conveying pipeline system is provided with a manual butterfly valve (7), a pressure regulating valve (8), an electric shut-off valve (9), a filter (10), a flow meter B (11), a pressure gauge (12), a pneumatic regulating ball valve (13), and a pneumatic ball valve (14) in sequence. The exhaust gas conveying pipeline system is provided with a baffle (16) at the end of the pipeline. A venting pipeline is connected in parallel on the input side of the pressure gauge (12) and the output side of the pneumatic ball valve (14). A sampling pipeline is connected in parallel on the output side of the flow meter B (11) and the output side of the pneumatic ball valve (14). An overflow pipeline, a water inlet pipeline, and a water outlet pipeline are connected in parallel on the output side of the electric shut-off valve (9). The hot secondary air pipeline system is connected to the output side of the pneumatic ball valve (14).

2. The waste gas co-firing system according to claim 1, characterized in that: The exhaust gas conveying pipeline system also includes a nitrogen protection pipeline, which has two parallel branches. One branch is connected to the input side of the filter (10), and the other branch is connected to the output side of the pneumatic ball valve (14). Both branches are equipped with a manual ball valve and a swing check valve (15).

3. The waste gas co-firing system according to claim 1, characterized in that: A temporary pipeline is provided between the input side of the filter (10) and the output side of the flow meter B (11), and a manual ball valve is provided on the temporary pipeline.

4. The waste gas co-firing system according to claim 1, characterized in that: The hot secondary air duct system consists of two sets of blowers (4), two sets of air preheaters (3), and air ducts. The blowers (4) and air preheaters (3) are connected in a one-to-one correspondence. The air preheaters (3) are connected to the air ducts respectively. The end of the air duct is connected to the burner (2). A flow meter A (6) is provided on the air duct.

5. The waste gas co-firing system according to claim 1, characterized in that: The boiler (1) is equipped with a leak detector (5).

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