A waste incineration flue gas full utilization recirculation system

Abstract

The utility model provides a kind of garbage incineration flue gas full utilization recirculation system, including incinerator and waste heat boiler, the incinerator is equipped with inlet pipe and discharge pipe, the waste heat boiler is equipped with inlet flue and flue gas duct, the incinerator and waste heat boiler are equipped with flue gas recirculation device, the flue gas recirculation device includes circulation inlet pipe, high-temperature flue gas circulation pipe, low-temperature flue gas circulation pipe, air supplement pipe, anticorrosive mechanism and flue gas monitoring mechanism.

Description

Technical Field

[0001] This utility model relates to the technical field of municipal solid waste incineration equipment, and in particular to a waste incineration flue gas full utilization and recycling system. Background Technology

[0002] Waste incineration is a process in which waste is reduced in volume through appropriate thermal decomposition, combustion, and melting reactions at high temperatures, turning it into residue or molten solid matter. The flue gas produced during waste incineration is at a high temperature and contains high energy; directly releasing it into the air would result in energy waste. Furthermore, some of the flue gas cannot be fully combusted, leading to the generation of pollutants. This not only fails to fully utilize energy but also causes air pollution. Therefore, subsequent treatment of the flue gas and pollutants is necessary. This subsequent treatment of pollutants requires additional costs and equipment, increasing the overall investment and necessitating improvement. Utility Model Content

[0003] To address the shortcomings of the aforementioned technologies, this utility model provides a waste incineration flue gas utilization and recirculation system, comprising an incinerator and a waste heat boiler. The incinerator is equipped with an inlet pipe and an outlet pipe, and the waste heat boiler is equipped with a flue gas inlet pipe and an outlet pipe. A flue gas recirculation device is provided between the incinerator and the waste heat boiler. The flue gas recirculation device includes a recirculating inlet pipe, a high-temperature flue gas recirculation pipe, a low-temperature flue gas recirculation pipe, a make-up air pipe, a corrosion-resistant mechanism, and a flue gas monitoring mechanism. One end of the high-temperature flue gas recirculation pipe is connected to the outlet pipe near the incinerator. One end of the low-temperature flue gas circulation pipe is connected to the flue gas inlet pipe of the waste heat boiler, and the other end is connected to the flue gas inlet pipe of the waste heat boiler. One end of the circulation air inlet pipe is connected to the flue gas outlet pipe, and the other end is connected to the incinerator. The make-up air pipe is connected to the circulation air inlet pipe. The anti-corrosion mechanism is installed on the flue gas outlet pipe. The flue gas monitoring mechanism is installed at the end of the outlet pipe. A solenoid valve is installed on the outlet pipe near the end. The solenoid valve is connected to the flue gas monitoring mechanism through a PLC controller.

[0004] By adopting the above technical solution, a flue gas recirculation device, including a circulating air inlet pipe, a high-temperature flue gas recirculation pipe, a low-temperature flue gas recirculation pipe, a makeup air pipe, an anti-corrosion mechanism, and a flue gas monitoring mechanism, is installed between the incinerator and the waste heat boiler. The high-temperature and low-temperature unburned flue gas discharged from the incinerator's exhaust pipe flows back to the waste heat boiler through the high-temperature and low-temperature flue gas recirculation pipes for flue gas energy recovery. After recovery, the unburned flue gas discharged from the waste heat boiler passes through the circulating air inlet pipe and mixes with the newly introduced secondary air containing a large amount of combustion oxygen through the makeup air pipe before being reintroduced into the incinerator's furnace for secondary combustion. After complete combustion, the flue gas is monitored by the flue gas monitoring mechanism at the end of the exhaust pipe. If the pollutant indicators are within acceptable limits, the gas can be discharged through a solenoid valve; the remaining portion re-enters the recirculation process until the emission standards are met. This recirculation process ensures complete combustion, reduces pollutant generation, and fully utilizes excess energy, reducing investment while meeting the requirements of sustainable development.

[0005] Further features of this invention: The anti-corrosion mechanism includes a lime powder spraying unit, a spraying pipe, and a sedimentation pipe. One end of the spraying pipe is connected to the exhaust pipe, and the other end is connected to the lime powder spraying unit. Both ends of the sedimentation pipe are connected to the exhaust pipe and the circulating air intake pipe, respectively.

[0006] By adopting the above technical solution, the anti-corrosion mechanism includes a lime powder injection unit, an injection pipe, and a sedimentation pipe. One end of the injection pipe is connected to the flue gas pipe, and the other end is connected to the lime powder injection unit. Both ends of the sedimentation pipe are connected to the flue gas pipe and the circulating air intake pipe, respectively. Through the lime powder injection unit and the injection pipe, lime powder is sprayed into the flue gas pipe, which fully absorbs the moisture in the low-temperature flue gas after energy recovery. This prevents the temperature of the flue gas after energy absorption from falling below the dew point of the flue gas, thus avoiding the combination of acidic gas and moisture to form corrosive acid that corrodes the pipeline. This results in a longer service life and more stable operation of the circulation system.

[0007] A further feature of this invention is that the anti-corrosion mechanism also includes a dust removal chamber, which is connected to the sedimentation pipe.

[0008] By adopting the above technical solution, since the anti-corrosion mechanism also includes a ash removal chamber, which is connected to the sedimentation pipe, the reacted lime powder and excess lime powder can settle in the ash removal chamber, which facilitates subsequent maintenance and cleaning.

[0009] A further feature of this invention is that the flue gas monitoring mechanism includes a branch pipe and a flue gas analyzer, both ends of the branch pipe are connected to the emission pipe, and the flue gas analyzer is mounted on the branch pipe.

[0010] Using the above technical solution, since the flue gas monitoring mechanism includes a branch pipe and a flue gas analyzer, both ends of the branch pipe are connected to the emission pipe, and the flue gas analyzer is installed on the branch pipe. A small portion of the flue gas is diverted through the branch pipe for component detection, and then the flue gas monitoring mechanism detects the components of harmful substances and pollutants to determine whether they meet the emission standards. Attached Figure Description

[0011] Appendix Figure 1 This is a schematic diagram of a waste incineration flue gas full utilization and recycling system according to a specific embodiment of the present invention.

[0012] Appendix Figure 2 This is a partial structural diagram of the anti-corrosion mechanism in a waste incineration flue gas full utilization and recycling system according to a specific embodiment of the present invention.

[0013] Appendix Figure 3 This is a partial structural diagram of a flue gas monitoring mechanism in a waste incineration flue gas full utilization and recycling system according to a specific embodiment of the present invention.

[0014] 1-Incinerator, 2-Waste heat boiler, 3-Inlet pipe, 4-Outlet pipe, 5-Smoke inlet pipe, 6-Smoke exhaust pipe, 7-Flue gas recirculation device, 8-Circulating inlet pipe, 9-High-temperature flue gas circulation pipe, 10-Low-temperature flue gas circulation pipe, 11-Make-up air pipe, 12-Anti-corrosion mechanism, 13-Flue gas monitoring mechanism, 14-Solenoid valve, 15-Lime powder injection unit, 16-Injection pipe, 17-Sedimentation pipe, 18-Ash cleaning bin, 19-Branch pipe, 20-Flue gas analyzer. Detailed Implementation

[0015] like Figure 1-3 As shown, a waste incineration flue gas recycling system includes an incinerator 1 and a waste heat boiler 2. The incinerator is equipped with an inlet pipe 3 and an outlet pipe 4, and the waste heat boiler is equipped with a flue gas inlet pipe 5 and an outlet pipe 6. A flue gas recirculation device 7 is provided between the incinerator and the waste heat boiler. The flue gas recirculation device includes a recirculating inlet pipe 8, a high-temperature flue gas recirculation pipe 9, a low-temperature flue gas recirculation pipe 10, a make-up air pipe 11, an anti-corrosion mechanism 12, and a flue gas monitoring mechanism 13. One end of the high-temperature flue gas recirculation pipe is connected to the outlet pipe near the incinerator. One end of the low-temperature flue gas circulation pipe is connected to the end of the exhaust pipe away from the incinerator, and the other end is connected to the flue gas inlet pipe of the waste heat boiler. One end of the circulation air inlet pipe is connected to the exhaust pipe, and the other end is connected to the incinerator. The make-up air pipe is connected to the circulation air inlet pipe. The anti-corrosion mechanism is set on the exhaust pipe. The flue gas monitoring mechanism is set at the end of the exhaust pipe. A solenoid valve 14 is set on the exhaust pipe near the end. The solenoid valve is connected to the flue gas monitoring mechanism through a PLC controller.

[0016] By installing a flue gas recirculation device between the incinerator and the waste heat boiler, including a circulating air inlet pipe, a high-temperature flue gas recirculation pipe, a low-temperature flue gas recirculation pipe, a makeup air pipe, an anti-corrosion mechanism, and a flue gas monitoring mechanism, the high-temperature and low-temperature unburned flue gas discharged from the incinerator's exhaust pipe is returned to the waste heat boiler through the high-temperature and low-temperature flue gas recirculation pipes for flue gas energy recovery. After recovery, the unburned flue gas discharged from the waste heat boiler passes through the circulating air inlet pipe and mixes with the secondary air newly introduced through the makeup air pipe containing a large amount of combustion oxygen before being sent back into the furnace of the incinerator for secondary combustion. After complete combustion, the flue gas is monitored by the flue gas monitoring mechanism at the end of the exhaust pipe. If the pollutant indicators are qualified, it can be discharged through the solenoid valve. The remaining part re-enters the recirculation until the emission indicators are met. After the flue gas undergoes the above recirculation treatment, it can not only achieve complete combustion and reduce the generation of pollutants, but also recover and make full use of excess energy, reducing input and meeting the requirements of sustainable development.

[0017] The corrosion protection mechanism includes a lime powder spraying unit 15, a spraying pipe 16, and a sedimentation pipe 17. One end of the spraying pipe is connected to the exhaust pipe, and the other end is connected to the lime powder spraying unit. The two ends of the sedimentation pipe are connected to the exhaust pipe and the circulating air intake pipe, respectively.

[0018] The corrosion protection mechanism includes a lime powder injection unit, an injection pipe, and a sedimentation pipe. One end of the injection pipe is connected to the flue gas pipe, and the other end is connected to the lime powder injection unit. Both ends of the sedimentation pipe are connected to the flue gas pipe and the circulating air intake pipe, respectively. Through the lime powder injection unit and the injection pipe, lime powder is sprayed into the flue gas pipe, which fully absorbs the moisture in the low-temperature flue gas after energy recovery. This prevents the temperature of the flue gas after energy absorption from falling below the dew point of the flue gas, thus avoiding the combination of acidic gas and moisture to form corrosive acid that corrodes the pipe. This results in a longer service life and more stable operation of the circulation system.

[0019] The corrosion protection mechanism also includes a dust removal chamber 18, which is connected to the sedimentation pipe.

[0020] Since the anti-corrosion mechanism also includes a ash removal chamber, which is connected to the sedimentation pipe, the reacted lime powder and excess lime powder can settle in the ash removal chamber, which facilitates subsequent maintenance and cleaning.

[0021] The flue gas monitoring mechanism includes a branch pipe 19 and a flue gas analyzer 20. Both ends of the branch pipe are connected to the emission pipe, and the flue gas analyzer is installed on the branch pipe.

[0022] Since the flue gas monitoring mechanism includes a branch pipe and a flue gas analyzer, both ends of the branch pipe are connected to the emission pipe, and the flue gas analyzer is installed on the branch pipe, a small portion of the flue gas is diverted through the branch pipe for component detection, and then the flue gas monitoring mechanism detects the components of harmful substances and pollutants to determine whether they meet the emission standards.

Claims

1. A waste incineration flue gas full utilization and recycling system, comprising an incinerator and a waste heat boiler, wherein the incinerator is provided with an inlet pipe and an outlet pipe, and the waste heat boiler is provided with a flue gas inlet pipe and a flue gas outlet pipe, characterized in that: A flue gas recirculation device is provided between the incinerator and the waste heat boiler. The flue gas recirculation device includes a recirculation inlet pipe, a high-temperature flue gas recirculation pipe, a low-temperature flue gas recirculation pipe, a makeup air pipe, an anti-corrosion mechanism, and a flue gas monitoring mechanism. One end of the high-temperature flue gas recirculation pipe is connected to the end of the exhaust pipe near the incinerator, and the other end is connected to the flue gas inlet pipe of the waste heat boiler. One end of the low-temperature flue gas recirculation pipe is connected to the end of the exhaust pipe away from the incinerator, and the other end is connected to the flue gas inlet pipe of the waste heat boiler. One end of the recirculation inlet pipe is connected to the exhaust pipe, and the other end is connected to the incinerator. The makeup air pipe is connected to the recirculation inlet pipe. The anti-corrosion mechanism is installed on the exhaust pipe. The flue gas monitoring mechanism is installed at the end of the exhaust pipe. A solenoid valve is installed on the exhaust pipe near the end. The solenoid valve is connected to the flue gas monitoring mechanism through a PLC controller.

2. The waste incineration flue gas full utilization and recycling system according to claim 1, characterized in that: The corrosion protection mechanism includes a lime powder spraying unit, a spraying pipe, and a sedimentation pipe. One end of the spraying pipe is connected to the exhaust pipe, and the other end is connected to the lime powder spraying unit. The two ends of the sedimentation pipe are connected to the exhaust pipe and the circulating air intake pipe, respectively.

3. The waste incineration flue gas full utilization and recycling system according to claim 2, characterized in that: The corrosion protection mechanism also includes a dust removal chamber, which is connected to the sedimentation pipe.

4. The waste incineration flue gas full utilization and recycling system according to claim 1, characterized in that: The flue gas monitoring mechanism includes a branch pipe and a flue gas analyzer. Both ends of the branch pipe are connected to the emission pipe, and the flue gas analyzer is installed on the branch pipe.

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