Cracking waste gas recycling system

Abstract

The utility model relates to the technical field of organic matter-containing solid waste recovery, in particular to a pyrolysis waste gas recycling system which comprises a pyrolysis chamber, a feeding port, a discharging port and a pyrolysis gas outlet are formed in the pyrolysis chamber, and the pyrolysis gas outlet is connected with a pyrolysis gas pipeline; the pyrolysis chamber is mounted in the heating chamber, a gas inlet and a flue gas outlet are formed in the heating chamber, the gas inlet is connected with a gas pipeline, and the flue gas outlet is connected with a first flue gas pipeline; the first heat exchange device is provided with a heat source inlet, a heat source outlet, a cold source inlet and a cold source outlet, the first flue gas pipeline is connected with the heat source inlet, the pyrolysis gas pipeline is connected with the cold source inlet, the heat source outlet is connected with the second flue gas pipeline, the cold source outlet is connected with a pyrolysis gas backflow pipeline, and the pyrolysis gas backflow pipeline is connected with the heating chamber. According to the utility model, the pyrolysis gas can be kept at a higher temperature in the conveying process, condensation is avoided, the pipeline blockage and corrosion risk is reduced, flue gas heat energy and organic components of the pyrolysis gas are fully utilized, and the resource utilization rate is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of recycling organic solid waste, in particular to a recycling system for cracking waste gas. Background Art

[0002] In industrial production, solid waste containing various organic substances (organic solid waste for short) is often produced, such as waste lithium batteries, waste solid petroleum products, etc. Some organic solid waste contains a large amount of high molecular weight organic matter, which has a long natural degradation cycle. If it is not properly handled, there is a risk of environmental pollution. Therefore, how to safely handle organic solid waste and recycle it with high resource utilization is an important issue in the field of energy conservation and emission reduction.

[0003] The existing recycling process of organic solid waste mainly involves crushing the organic solid waste and then subjecting it to high-temperature treatment, so that the high-molecular organic matter therein is thermally decomposed into gaseous small-molecule organic matter, and then further recycled. In the high-temperature treatment link, in order to avoid the direct aerobic combustion of organic solid waste to produce toxic substances, an anaerobic cracking process can be used to heat the organic solid waste in a closed anaerobic cracking furnace. The organic matter in the lithium organic solid waste is thermally cracked to generate cracking waste gas containing a variety of gaseous organic matter. The process produces less toxic substances and has a smaller burden on the environment. The cracking waste gas generated by the anaerobic cracking process can be discharged after harmless treatment, or it can be transported through a pipeline to the required device or system for recycling, such as transporting it to a gas boiler for use as fuel.

[0004] However, in the existing process of recycling organic solid waste, it is necessary to use a cracking gas pipeline to transport the cracking waste gas for recycling. During the transportation process, the temperature of the cracking waste gas gradually decreases, and some gaseous organic components with higher boiling points will condense, resulting in liquid organic matter in the cracking gas transportation pipeline. The liquid organic matter may also form colloidal substances after mixing with the dust in the cracking waste gas, which poses a risk of clogging and corroding the pipeline. At the same time, this part of the condensed liquid organic matter is difficult to be effectively recycled, resulting in a low resource recovery rate of the cracking waste gas and a certain amount of resource waste. Utility Model Content

[0005] In view of the technical problems in the existing process of recycling cracking waste gas, such as the cooling of the cracking gas during transportation, the condensation of some organic matter into liquid, the risk of clogging and corrosion of pipelines, and the low resource recovery rate, the utility model provides a cracking waste gas recovery and utilization system, which uses the high-temperature flue gas formed after the combustion of gas in the heating chamber to heat the battery cracking gas, so that the cracking gas maintains a high temperature during transportation, avoids the condensation of organic matter in the cracking gas into liquid or mixing with dust to form colloidal substances, reduces the risk of clogging and corrosion, and improves resource utilization; the heated cracking gas is transported back to the heating chamber as fuel for heating, which can reduce energy consumption, make full use of the flue gas heat energy in the heating chamber and the organic components in the cracking gas, improve resource utilization, reduce gas consumption, and reduce carbon emissions.

[0006] The technical solution of the utility model is:

[0007] A system for recycling cracking waste gas comprises a pyrolysis chamber, wherein the pyrolysis chamber is provided with a feed inlet, a feed outlet and a cracking gas outlet, and the cracking gas outlet is connected to a cracking gas pipeline; the pyrolysis chamber is installed inside a heating chamber, wherein the heating chamber is provided with a gas inlet and a flue gas outlet, the gas inlet is connected to a gas pipeline, and the flue gas outlet is connected to a first flue gas pipeline; and further comprises a first heat exchange device, wherein the first heat exchange device is provided with a heat source inlet, a heat source outlet, a cold source inlet and a cold source outlet, the first flue gas pipeline is connected to the heat source inlet, the cracking gas pipeline is connected to the cold source inlet, the heat source outlet is connected to a second flue gas pipeline, the cold source outlet is connected to a cracking gas reflux pipeline, and the cracking gas reflux pipeline is connected to the heating chamber.

[0008] Furthermore, the first heat exchange device is an air-to-air plate heat exchanger, which can fully and efficiently transfer the heat of the flue gas to the cracking gas, so that the cracking gas maintains a high temperature during transportation and avoids condensation of some organic matter in the cracking gas.

[0009] Furthermore, the second flue gas duct is connected to the exhaust gas treatment system, and the exhaust gas treatment system performs harmless treatment on the flue gas in the second flue gas duct before discharging it, thereby reducing pollution.

[0010] Furthermore, the second flue gas duct is connected to the second heat exchange device and the exhaust gas treatment system in sequence. The second heat exchange device can cool down and exchange heat again on the flue gas cooled by the first heat exchange device, and can further recycle the waste heat in the flue gas, thereby improving the waste heat utilization rate of the flue gas.

[0011] Furthermore, the second heat exchange device is a gas-liquid plate heat exchanger, which can fully and efficiently recover and utilize the waste heat of the flue gas.

[0012] Furthermore, the exhaust gas treatment system includes a cooling device, a dust removal device, a harmless reaction device, and an adsorption device which are connected in sequence.

[0013] Furthermore, the harmless reaction device includes a nitrogen oxide treatment device and / or an acid gas treatment device, which can perform targeted harmless treatment on nitrogen oxides and acid gases in the flue gas.

[0014] The beneficial effects of the utility model are:

[0015] The utility model provides a cracking waste gas recovery and utilization system, which connects a first flue gas pipeline and a cracking gas pipeline to a first heat exchange device respectively, and can transfer heat in the flue gas to the cracking gas through the first heat exchange device, thereby heating the cracking gas and keeping a relatively high temperature of the cracking gas during transportation, thereby preventing some organic matter in the cracking gas from condensing into liquid due to cooling and clogging or corroding the pipeline, reducing the loss of organic matter in the cracking gas and achieving high resource utilization. Using flue gas as a heat source for heating the cracking gas can effectively utilize the waste heat of the flue gas, thereby further improving resource utilization.

[0016] The first heat exchange device of the utility model is connected to the heating chamber through a cracked gas return pipe. The cracked gas heated in the first heat exchange device is transported back to the heating chamber through the cracked gas return pipe to be burned as fuel for heating, which can fully utilize the thermal energy of the flue gas, reduce the gas consumption in the heating chamber, and reduce energy consumption; the cracked gas does not need to be transported over long distances, further reducing the possibility of condensation of the cracked gas, and can fully utilize the organic components in the cracked gas, improve resource utilization, reduce gas consumption, and reduce carbon emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a schematic diagram of the structure of the cracking waste gas recovery and utilization system in Example 1.

[0019] In the figure, 1-pyrolysis chamber, 11-feed port, 12-discharge port, 13-cracking gas pipeline, 2-heating chamber, 21-fuel gas pipeline, 22-first flue gas pipeline, 3-first heat exchange device, 31-second flue gas pipeline, 32-cracking gas reflux pipeline, 4-second heat exchange device, 5-exhaust gas treatment system. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0021] Example 1

[0022] A system for recycling pyrolysis waste gas comprises a pyrolysis chamber 1, wherein the pyrolysis chamber 1 is provided with a feed inlet 11, a discharge outlet 12 and a pyrolysis gas outlet, wherein the pyrolysis gas outlet is connected to a pyrolysis gas pipeline 13;

[0023] The pyrolysis chamber 1 is installed inside the heating chamber 2. The heating chamber 2 is provided with a gas inlet and a smoke outlet. The gas inlet is connected to the gas pipeline 21, and the smoke outlet is connected to the first smoke pipeline 22.

[0024] The invention also includes a first heat exchange device 3, which is an air-to-air plate heat exchanger. The first heat exchange device 3 is provided with a heat source inlet, a heat source outlet, a cold source inlet and a cold source outlet. The first flue gas pipe 22 is connected to the heat source inlet, the cracked gas pipe 13 is connected to the cold source inlet, the heat source outlet is connected to the second flue gas pipe 31, the second flue gas pipe 31 is connected to the second heat exchange device 4 and the exhaust gas treatment system 5 in sequence. The second heat exchange device 4 is a gas-liquid plate heat exchanger. The exhaust gas treatment system 5 includes a cooling device, a dust removal device, a nitrogen oxide treatment device, an acid gas treatment device and an adsorption device which are connected in sequence. The cold source outlet is connected to a cracked gas reflux pipe 32, and the cracked gas reflux pipe 32 is connected to the heating chamber 2.

[0025] Although the present invention is described in detail by referring to the accompanying drawings and in combination with the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, a person skilled in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions shall be within the scope of the present invention. Any person skilled in the art who is familiar with the present technical field may easily think of changes or substitutions within the technical scope disclosed in the present invention, and these shall be within the scope of protection of the present invention.

Claims

1. A system for recycling pyrolysis waste gas, comprising a pyrolysis chamber, characterized in that: The pyrolysis chamber is provided with a feed inlet, a discharge port and a cracked gas outlet, and the cracked gas outlet is connected to the cracked gas pipeline; the pyrolysis chamber is installed inside the heating chamber, and the heating chamber is provided with a gas inlet and a flue gas outlet, the gas inlet is connected to the gas pipeline, and the flue gas outlet is connected to the first flue gas pipeline; it also includes a first heat exchange device, and the first heat exchange device is provided with a heat source inlet, a heat source outlet, a cold source inlet and a cold source outlet, the first flue gas pipeline is connected to the heat source inlet, the cracked gas pipeline is connected to the cold source inlet, the heat source outlet is connected to the second flue gas pipeline, the cold source outlet is connected to the cracked gas reflux pipeline, and the cracked gas reflux pipeline is connected to the heating chamber.

2. The recycling system according to claim 1, characterized in that: The first heat exchange device is an air-to-air plate heat exchanger.

3. The recycling system according to claim 1, characterized in that: The second flue gas duct is connected to the exhaust gas treatment system.

4. The recycling system according to claim 3, characterized in that: The second flue gas duct is connected to the second heat exchange device and the tail gas treatment system in sequence.

5. The recycling system according to claim 4, characterized in that: The second heat exchange device is a gas-liquid plate heat exchanger.

6. The recycling system according to claim 3, characterized in that: The exhaust gas treatment system includes a cooling device, a dust removal device, a harmless reaction device, and an adsorption device which are connected in sequence.

7. The recycling system according to claim 6, characterized in that: The harmless reaction device includes a nitrogen oxide treatment device and / or an acid gas treatment device.

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