A rapid cooling heat exchange system for hazardous waste incineration

Abstract

This invention provides a rapid cooling heat exchange system for hazardous waste incineration, comprising a hazardous waste incinerator, a waste heat boiler, a high-temperature dust collector, a rapid cooling heat exchanger, a bag filter, an induced draft fan, and an alkaline scrubbing tower. The waste heat boiler is located between the hazardous waste incinerator and the high-temperature dust collector. The rapid cooling heat exchanger is located after the high-temperature dust collector and is connected to the outlet of the high-temperature dust collector via a gas conveying pipeline. The flue gas inlet of the bag filter is connected to the rapid cooling heat exchanger, and the flue gas outlet of the bag filter is connected to the induced draft fan. The alkaline scrubbing tower is located after the induced draft fan. This rapid cooling heat exchange system for hazardous waste incineration employs dry heat exchange rapid cooling, which can recover and utilize the heat in the high-temperature flue gas, saving energy and reducing consumption. At the same time, dry heat exchange rapid cooling can prevent the influence of water vapor on the filter bags in the subsequent dust removal process, increasing the stability of the entire flue gas treatment process.

Description

Technical Field

[0001] This utility model belongs to the field of energy-saving and environmental protection technology, and in particular relates to a rapid cooling heat exchange system for hazardous waste incineration. Background Technology

[0002] Hazardous waste incineration is a technology that uses high-temperature thermal oxidation to treat combustible organic waste. Under complete combustion conditions, the organic matter removal rate can reach 99%, and it is widely used in hazardous waste treatment. The volume of ash after incineration is significantly reduced, decreasing landfill volume. However, hazardous waste incineration generates toxic and harmful substances, including dioxins, necessitating strict purification of the flue gas. Currently, hazardous waste incineration uses atomized droplets mixed with high-temperature flue gas to rapidly cool the gaseous pollutant components, reducing the time for dioxin heterogeneous synthesis. Rapid cooling control is a crucial technology for incineration flue gas purification. Previous projects have frequently encountered problems such as poor rapid cooling atomization, slow response to water / gas pressure regulation, and over-spraying during rapid cooling. Furthermore, the rapid cooling process results in significant heat loss from the flue gas and the release of large amounts of water vapor, causing inconvenience for subsequent flue gas dust removal and easily clogging dust collector filter bags, affecting the normal operation of dust collection equipment. Utility Model Content

[0003] To address the above technical problems, this utility model discloses a rapid cooling heat exchange system for hazardous waste incineration. It adopts dry heat exchange rapid cooling, which can recover and utilize the heat in high-temperature flue gas, saving energy and reducing consumption. At the same time, dry heat exchange rapid cooling can prevent the influence of water vapor on the filter bags in the subsequent dust removal process, increasing the stability of the entire flue gas treatment process.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A quenching heat exchange system for hazardous waste incineration includes a hazardous waste incinerator, a waste heat boiler, a high-temperature dust collector, a quenching heat exchanger, a bag filter, an induced draft fan, and an alkaline scrubbing tower. The waste heat boiler is located between the hazardous waste incinerator and the high-temperature dust collector. The quenching heat exchanger is located behind the high-temperature dust collector and is connected to the outlet of the high-temperature dust collector via a gas transmission pipeline. The flue gas inlet of the bag filter is connected to the quenching heat exchanger, and the flue gas outlet of the bag filter is connected to the induced draft fan. The alkaline scrubbing tower is located after the induced draft fan.

[0005] Furthermore, the hazardous waste incinerator includes a hazardous waste inlet, a natural gas inlet, and a combustion air inlet. The hazardous waste inlet is located at the top of the hazardous waste incinerator, while the natural gas inlet and the combustion air inlet are located at the ends of the hazardous waste incinerator.

[0006] Furthermore, the quench heat exchanger is a shell-and-tube heat exchanger, including a cold air inlet, a hot air outlet, a hot flue gas inlet, and a cold flue gas outlet. The hot air outlet is connected to the combustion air inlet through a hot air duct. The hot flue gas inlet is connected to the outlet of the high-temperature dust collector, and the cold flue gas outlet is connected to the inlet of the bag filter.

[0007] Furthermore, the high-temperature dust collector is a media filter, and the filter medium is one of ceramic filter tubes, metal filter bags, or metal filter tubes.

[0008] The present invention discloses a rapid cooling heat exchange system for hazardous waste incineration. The high-temperature flue gas from the incinerator first recovers some heat through a waste heat boiler. After the flue gas temperature is reduced to 400-500℃ by the waste heat boiler, it enters a high-temperature dust collector for high-temperature dust removal to prevent particulate matter from clogging the rapid cooling heat exchanger. After rapid heat exchange, the flue gas temperature drops to 180-230℃ and then enters a bag filter for secondary deep dust removal. The hot air heated by the rapid cooling heat exchanger enters the incinerator as combustion air, which can significantly reduce the natural gas consumption of the incinerator and achieve energy saving. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the quenching heat exchange system used for hazardous waste incineration.

[0010] Among them, 1- Hazardous waste incinerator, 2- Waste heat boiler, 3- High temperature dust collector, 4- Quenching heat exchanger, 5- Bag filter, 6- Exhaust fan, 7- Alkali scrubbing tower, 101- Hazardous waste inlet, 102- Natural gas inlet, 103- Combustion air inlet, 401- Cold air inlet, 402- Hot air outlet, 403- Hot flue gas inlet, 404- Cold flue gas outlet Detailed Implementation

[0011] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0012] like Figure 1 As shown, a quenching heat exchange system for hazardous waste incineration includes a hazardous waste incinerator 1, a waste heat boiler 2, a high-temperature dust collector 3, a quenching heat exchanger 4, a bag filter 5, an induced draft fan 6, and an alkaline scrubbing tower 7. The waste heat boiler 2 is located between the hazardous waste incinerator 1 and the high-temperature dust collector 3. The quenching heat exchanger 4 is located behind the high-temperature dust collector 3 and is connected to the outlet of the high-temperature dust collector 3 through a gas conveying pipeline. The flue gas inlet of the bag filter 5 is connected to the quenching heat exchanger 4, and the flue gas outlet of the bag filter 5 is connected to the induced draft fan 6. The alkaline scrubbing tower 7 is located after the induced draft fan 6.

[0013] Specifically, the hazardous waste incinerator 1 includes a hazardous waste inlet 101, a natural gas inlet 102, and a combustion air inlet 103. The hazardous waste inlet 101 is located at the top of the hazardous waste incinerator 1, and the natural gas inlet 102 and the combustion air inlet 103 are located at the ends of the hazardous waste incinerator 1.

[0014] Specifically, the quench heat exchanger 4 is a shell and tube heat exchanger, including a cold air inlet 401, a hot air outlet 402, a hot flue gas inlet 403, and a cold flue gas outlet 404. The hot air outlet 402 is connected to the combustion air inlet 103 through a hot air duct. The hot flue gas inlet 403 is connected to the air outlet of the high-temperature dust collector 3, and the cold flue gas outlet 404 is connected to the air inlet of the bag filter 5.

[0015] In some embodiments, the high-temperature dust collector 3 is a media filter, and the filter medium is one of ceramic filter tube, metal filter bag, and metal filter tube.

[0016] Those skilled in the art should understand that the above description is merely a specific embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A quenching heat exchange system for hazardous waste incineration, characterized in that, The system includes a hazardous waste incinerator, a waste heat boiler, a high-temperature dust collector, a quench heat exchanger, a bag filter, an induced draft fan, and an alkaline scrubbing tower. The waste heat boiler is located between the hazardous waste incinerator and the high-temperature dust collector. The quench heat exchanger is located behind the high-temperature dust collector and is connected to the outlet of the high-temperature dust collector via a gas transmission pipeline. The flue gas inlet of the bag filter is connected to the quench heat exchanger, and the flue gas outlet of the bag filter is connected to the induced draft fan. The alkaline scrubbing tower is located after the induced draft fan.

2. The quenching heat exchange system for hazardous waste incineration according to claim 1, characterized in that, The hazardous waste incinerator includes a hazardous waste inlet, a natural gas inlet, and a combustion air inlet. The hazardous waste inlet is located at the top of the hazardous waste incinerator, while the natural gas inlet and the combustion air inlet are located at the ends of the hazardous waste incinerator.

3. The quenching heat exchange system for hazardous waste incineration according to claim 1, characterized in that, The quench heat exchanger is a shell-and-tube heat exchanger, including a cold air inlet, a hot air outlet, a hot flue gas inlet, and a cold flue gas outlet. The hot air outlet is connected to the combustion air inlet through a hot air duct. The hot flue gas inlet is connected to the outlet of the high-temperature dust collector, and the cold flue gas outlet is connected to the inlet of the bag filter.

4. The quenching heat exchange system for hazardous waste incineration according to claim 1, characterized in that, The high-temperature dust collector is a media filter, and the filter medium is one of ceramic filter tubes, metal filter bags, or metal filter tubes.

Images