An environmentally friendly and efficient coupling system and method for tire rubber pellet pyrolysis and waste incineration generator set

Abstract

The present invention provides an environmentally friendly and efficient coupling system and method for pyrolysis of tire rubber particles and a waste incineration power generation unit. After the waste tire rubber particles undergo pyrolysis reaction, pyrolysis carbon black, pyrolysis oil and pyrolysis gas are generated. The pyrolysis oil and a portion of the pyrolysis gas are sent to a waste incinerator for coupled combustion with the waste. The flue gas generated by the combustion of the pyrolysis products enters the flue gas purification system with the waste incineration flue gas for efficient and environmentally friendly disposal. The present invention innovatively utilizes the pyrolysis process to achieve the coupled incineration disposal of waste tires and waste incinerators, and relies on the flue gas purification system of the waste incineration unit to achieve environmentally friendly emissions; the sulfur component contained in the pyrolysis product can greatly inhibit the resynthesis of dioxins; the coupled combustion of the pyrolysis product can effectively solve the problem of unstable combustion caused by the low calorific value and complex components of the waste currently faced by the waste incinerator. At the same time, the high-value utilization of the pyrolysis product can reduce the operating cost of the waste incineration unit to a certain extent.

Description

Technical Field

[0001] The invention relates to a coupling system of tire rubber particle pyrolysis and waste incineration generator set, belonging to the field of environmental protection and comprehensive resource utilization of solid waste such as waste tires. Background Art

[0002] At present, the comprehensive utilization of waste tires mainly includes direct utilization of waste tire prototypes, pyrolysis, retreading of old tires, production of recycled rubber, production of vulcanized rubber powder, etc. Among the above methods for treating waste tires, pyrolysis is considered to be the most efficient and environmentally friendly treatment method. Pyrolysis refers to the use of high temperature to heat the rubber blocks of waste tires under air-tight conditions to decompose them into fuel gas (hydrogen and methane, etc.), oil, carbon black and steel wire, etc., which can be used as a resource for waste tires without causing secondary pollution. The products of waste tire pyrolysis are pyrolysis oil, pyrolysis gas and pyrolysis carbon black. Although there are waste tire pyrolysis production lines in use in China, most of them have the following two problems: 1) Most of the pyrolysis gas is used as pyrolysis fuel, and the excess pyrolysis gas is directly discharged or led to the exhaust gas combustion chamber for combustion and then discharged, resulting in resource waste and certain pollution; 2) The tail gas treatment process is single, and it is difficult to meet the emission requirements of the national "Petrochemical Industry Pollutant Emission Standards" and "Odor Pollutant Emission Standards".

[0003] On the other hand, waste incineration power generation is a green, environmentally friendly and efficient method for treating urban solid waste, but there will be some problems in the development of waste incineration power generation. Taking the incineration of domestic waste as an example, there is a problem of unstable operation of the unit. The reason is that the composition of the garbage is very complex, and its calorific value is closely related to the season at that time. There are also a lot of non-combustible components mixed in it, which leads to the phenomenon of unstable calorific value of the garbage, affecting the stable operation of the waste incineration unit, and it is also easy to cause environmental problems such as excessive dioxin emissions; in addition, there is a big problem for waste incineration power plants at the county, township and prefecture-level cities. When the incineration plant is built, due to the low local population density, especially the relatively high proportion of population outflow in underdeveloped areas, the amount of domestic waste generated is insufficient, which makes the local waste power plant unable to operate normally for a long time. Summary of the invention

[0004] The purpose of the present invention is to address the current problems in the two fields of waste tire pyrolysis and waste incineration power generation, and to provide an environmentally friendly and efficient coupling system of tire rubber pellet pyrolysis and waste incineration power generation units, which has efficient resource utilization of solid waste, meets the emission standards of major pollutants, and has stable and reliable operation.

[0005] The environmentally friendly and efficient coupling system of tire rubber pellet pyrolysis and waste incineration power generation unit comprises a tire rubber pellet pyrolysis module and a pyrolysis product coupled waste incineration power generation module;

[0006] The tire rubber pellet pyrolysis module comprises a rubber pellet feed hopper (1), a pyrolyzer (2), a carbon black silo (3), an oil-gas separation device (4), an oil collecting tank (5), and a gas storage tank (6); the feed port of the pyrolyzer (2) is connected to the discharge port of the rubber pellet feed hopper (1), the fuel gas inlet of the pyrolyzer (2) is connected to one outlet of the gas storage tank (6), the carbon black outlet of the pyrolyzer (2) is connected to the inlet of the carbon black silo (3), the oil-gas outlet of the pyrolyzer (2) is connected to the inlet of the oil-gas separation device (4), the outlet of the oil-gas separation device (4) is connected to the inlet of the oil collecting tank (5), and the outlet of the oil collecting tank (5) and the other outlet of the gas storage tank (6) respectively enter the pyrolysis product coupled waste incineration power generation module;

[0007] The pyrolysis product coupled waste incineration power generation module comprises an oil burner (7), a gas burner (8), a waste incinerator (9), a flue gas purification system (10), and a chimney (11); the outlet of the oil collecting tank (5) of the tire rubber pellet pyrolysis module is connected to the oil burner (7) at the inlet end of the waste incinerator (9), the other outlet of the gas storage tank (6) is connected to the gas burner (8) at the inlet end of the waste incinerator (9), and the outlet of the waste incinerator (9) is connected to the flue gas purification system (10) and the chimney (11) in sequence.

[0008] As a preferred option: the tire rubber pellet pyrolysis module has a modular design feature, and the production scale mainly depends on the amount of waste tire resources in the area and the demand for pyrolysis oil and pyrolysis carbon black.

[0009] Preferably, the pyrolyzer (2) utilizes the pyrolysis gas in the pyrolysis product as an energy source, and the flue gas generated by the combustion and the flue gas from the incineration of domestic waste share a flue gas purification system (10).

[0010] Preferably, the oil-gas separation device (4) separates the gaseous substances at the pyrolysis outlet into pyrolysis gas and pyrolysis oil by condensation technology.

[0011] Preferably, the waste incinerator (9) is generally a domestic waste incinerator or a sludge incinerator, and the furnace type is generally a mechanical grate incinerator or a fluidized bed incinerator, which can achieve full and complete combustion of pyrolysis gas and pyrolysis oil.

[0012] The working method of the environmentally friendly and efficient coupling system of tire rubber pellet pyrolysis and waste incineration power generation unit is characterized by comprising the following steps:

[0013] S1. Waste tire rubber pellets enter the pyrolyzer (2) through the rubber pellet feed hopper (1) to undergo pyrolysis reaction to generate pyrolysis carbon black and an oil-gas mixture. The pyrolysis carbon black is initially stored in the carbon black silo (3) and can be directly used or processed as rubber carbon black. The oil-gas mixture is separated into pyrolysis oil and pyrolysis gas after passing through the oil-gas separation device (4). The pyrolysis oil is temporarily stored in the oil collecting tank (5) and can be used as fuel oil. The pyrolysis gas is temporarily stored in the gas storage tank (6). A portion of the pyrolysis gas is burned to provide the pyrolysis heat required for the pyrolysis in the pyrolyzer (2), and the other portion of the pyrolysis gas and the pyrolysis oil enter the pyrolysis product coupling waste incineration power generation module;

[0014] S2, the pyrolysis oil is sent to the waste incinerator (9) through the oil burner (7) to be coupled with the waste for combustion, and another part of the pyrolysis gas is sent to the waste incinerator (9) through the gas burner (8) to be coupled with the waste for combustion, and the flue gas generated by the coupled combustion of the pyrolysis oil and the pyrolysis gas enters the flue gas purification system (10) for treatment along with the waste incineration flue gas, and at the same time, the flue gas generated by the combustion of the pyrolysis gas heated by the pyrolysis furnace is also introduced into the flue gas purification system (10) for treatment, and the purified flue gas is discharged into the atmosphere through the chimney (11).

[0015] As a preferred embodiment: in step S2, taking the municipal solid waste incineration power generation unit as an example, the flue gas purification system (10) can achieve the national standard requirements for the main pollutants such as particulate matter, sulfur dioxide and nitrogen oxides after the coupled incineration flue gas is treated for environmental protection, reaching 20mg / m3, 80mg / m3 and 250mg / m3 respectively (satisfying the "Limits of pollutants in flue gas discharged from municipal solid waste incinerators" in Table 4 of the "Standard for Pollution Control of Municipal Solid Waste Incineration GB 18485-2014").

[0016] The beneficial effects of the present invention are:

[0017] 1. The present invention introduces a tire rubber pellet pyrolysis module, which successfully realizes the resource utilization, reduction and harmless coupling incineration disposal of waste tires and waste incinerators. First, the surplus pyrolysis gas generated by pyrolysis is introduced into the waste incinerator for combustion, which avoids energy waste, and at the same time can improve the combustion efficiency of the waste incinerator and increase the power generation output of the waste incinerator; secondly, relying on the flue gas purification system of the waste incineration unit, it has good environmental protection technology advantages, which can solve the environmental pollution problem caused by the combustion of pyrolysis gas and achieve environmentally friendly emissions.

[0018] 2. The present invention uses coupled incineration treatment to use the surplus pyrolysis gas and pyrolysis oil in the pyrolysis process as auxiliary fuel for stable combustion of the waste incinerator, effectively solving the problems of insufficient solid waste and unstable heat load due to low calorific value of solid waste faced by the current waste incinerator, ensuring that the waste incineration reaches the "850℃+2s" condition required to prevent the formation of dioxins; at the same time, the sulfur component contained in the surplus pyrolysis gas and pyrolysis oil can effectively passivate the catalytic effect of Cu on the formation of dioxins in a high chlorine environment during the waste incineration process, thereby greatly inhibiting the resynthesis of dioxins and effectively reducing the emission of dioxins.

[0019] 3. The pyrolysis oil produced by the tire rubber pellet pyrolysis module of the present invention can replace diesel as the ignition and combustion-supporting oil of the waste incineration unit; the pyrolysis carbon black produced by the tire rubber pellet pyrolysis module can replace activated carbon after in-situ activation and be used for the adsorption and removal of heavy metals and organic pollutants in the tail flue gas of the waste incineration project, which can reduce the operating cost of the waste incineration unit to a certain extent and contribute to the long-term normal operation of the waste incineration power plant. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a flow chart of the environmentally friendly and efficient coupling system of tire rubber pyrolysis and waste incineration power generation unit.

[0021] Explanation of the reference numerals: 1. Pellet feed hopper; 2. Pyrolyzer; 3. Carbon black silo; 4. Oil-gas separation device; 5. Oil collecting tank; 6. Gas storage tank; 7. Oil burner; 8. Gas burner; 9. Waste incinerator; 10. Flue gas purification system; 11. Chimney. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with embodiments. The description of the following embodiments is only used to help understand the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principles of the present invention, several improvements and modifications may be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0023] In this embodiment, the structure of the present invention is described in detail in conjunction with the accompanying drawings.

[0024] like Figure 1 As shown, this embodiment provides an environmentally friendly and efficient coupling system of tire rubber pellet pyrolysis and waste incineration power generation set, constructing a technology for coupling tire rubber pellet pyrolysis and waste incineration power generation set with efficient resource utilization of solid waste, emission of major pollutants in compliance with standards and stable and reliable operation, including a tire rubber pellet pyrolysis module and a pyrolysis product-coupled waste incineration power generation module.

[0025] The tire rubber pellet pyrolysis module includes a rubber pellet feed hopper 1, a pyrolyzer 2, a carbon black silo 3, an oil-gas separation device 4, an oil collecting tank 5, and a gas storage tank 6; the feed port of the pyrolyzer 2 is connected to the discharge port of the rubber pellet feed hopper 1, the gas inlet of the pyrolyzer 2 is connected to one outlet of the gas storage tank 6, the carbon black outlet of the pyrolyzer 2 is connected to the inlet of the carbon black silo 3, the oil and gas outlet of the pyrolyzer 2 is connected to the inlet of the oil and gas separation device 4, the outlet of the oil and gas separation device 4 is connected to the inlet of the oil collecting tank 5, and the outlet of the oil collecting tank 5 and the other outlet of the gas storage tank 6 respectively enter the pyrolysis product coupled waste incineration power generation module. The waste tire rubber pellets enter the pyrolyzer 2 through the rubber pellet feed hopper 1 for pyrolysis reaction to generate pyrolysis carbon black and an oil-gas mixture. The pyrolysis carbon black is initially stored in the carbon black silo 3. The oil-gas mixture is separated into pyrolysis oil and pyrolysis gas after passing through the oil-gas separation device 4. The pyrolysis oil is temporarily stored in the oil collecting tank 5, and the pyrolysis gas is temporarily stored in the gas storage tank 6. After a part of the pyrolysis gas is burned, it provides the heat required for pyrolysis for the pyrolysis 2, and the other part of the pyrolysis gas and the pyrolysis oil enter the pyrolysis product-coupled waste incineration power generation module.

[0026] The pyrolysis product coupled waste incineration power generation module includes an oil burner 7, a gas burner 8, a waste incinerator 9, a flue gas purification system 10, and a chimney 11; the outlet of the oil collecting tank 5 of the tire rubber pellet pyrolysis module is connected to the oil burner 7 at the inlet end of the waste incinerator 9, and the other outlet of the gas storage tank 6 is connected to the gas burner 8 at the inlet end of the waste incinerator 9. The outlet of the waste incinerator 9 is connected to the flue gas purification system 10 and the chimney 11 in sequence. The pyrolysis oil is sent to the waste incinerator 9 through the oil burner 7 for coupled combustion with the waste, and another part of the pyrolysis gas is sent to the waste incinerator 9 through the gas burner 8 for coupled combustion with the waste. The flue gas generated by the coupled combustion of the pyrolysis oil and the pyrolysis gas enters the flue gas purification system 10 for treatment along with the waste incineration flue gas, and the flue gas generated by the combustion of the pyrolysis gas heated by the pyrolysis furnace is also introduced into the flue gas purification system 10 for treatment, and the purified flue gas is discharged to the atmosphere through the chimney 11.

[0027] The tire rubber pellet pyrolysis module has a modular design feature, and the production scale mainly depends on the amount of waste tire resources in the area and the demand for pyrolysis oil and pyrolysis carbon black.

[0028] The pyrolyzer 2 utilizes the pyrolysis gas in the pyrolysis product as an energy source, and the flue gas generated by the combustion and the flue gas from the incineration of domestic waste share a flue gas purification system 10.

[0029] The oil-gas separation device 4 separates the gaseous substances at the pyrolysis outlet into pyrolysis gas and pyrolysis oil by condensation technology.

[0030] The waste incinerator 9 is a mechanical grate waste incinerator, which can achieve full and complete combustion of pyrolysis gas and pyrolysis oil.

[0031] The flue gas purification system 10 can achieve the national standard requirements for solid waste incineration for the main pollutants such as particulate matter, sulfur dioxide and nitrogen oxides after the environmental protection treatment of the coupled incineration flue gas. Taking a domestic waste incinerator as an example, after passing through its flue gas treatment facilities, the particulate matter, sulfur dioxide and nitrogen oxides in the incineration flue gas reach 20mg / m3, 80mg / m3 and 250mg / m3 respectively (satisfying the "Limits of pollutants in flue gas discharged from domestic waste incinerators" in Table 4 of "Pollution Control Standard for Domestic Waste Incineration GB 18485-2014").

Claims

1. An environmentally friendly and efficient coupling system of tire rubber pellet pyrolysis and waste incineration generator set, characterized by: It includes a tire rubber pellet pyrolysis module and a pyrolysis product coupled waste incineration power generation module; The tire rubber pellet pyrolysis module comprises a rubber pellet feed hopper (1), a pyrolyzer (2), a carbon black silo (3), an oil-gas separation device (4), an oil collecting tank (5), and a gas storage tank (6); the feed port of the pyrolyzer (2) is connected to the discharge port of the rubber pellet feed hopper (1), the gas inlet of the pyrolyzer (2) is connected to one outlet of the gas storage tank (6), the carbon black outlet of the pyrolyzer (2) is connected to the inlet of the carbon black silo (3), the oil-gas outlet of the pyrolyzer (2) is connected to the inlet of the oil-gas separation device (4), the outlet of the oil-gas separation device (4) is connected to the inlet of the oil collecting tank (5), and the outlet of the oil collecting tank (5) and the other outlet of the gas storage tank (6) respectively enter the pyrolysis product coupled waste incineration power generation module; The pyrolysis product coupled waste incineration power generation module comprises an oil burner (7), a gas burner (8), a waste incinerator (9), a flue gas purification system (10), and a chimney (11); the outlet of the oil collecting tank (5) of the tire rubber pellet pyrolysis module is connected to the oil burner (7) at the inlet end of the waste incinerator (9), the other outlet of the gas storage tank (6) is connected to the gas burner (8) at the inlet end of the waste incinerator (9), and the outlet of the waste incinerator (9) is connected to the flue gas purification system (10) and the chimney (11) in sequence; The pyrolyzer (2) utilizes pyrolysis gas in the pyrolysis product as an energy source, and the flue gas generated by the combustion and the flue gas from the incineration of domestic waste share a flue gas purification system (10); The oil-gas separation device (4) separates the gaseous substances at the pyrolysis outlet into pyrolysis gas and pyrolysis oil by condensation technology.

2. The environmentally friendly and efficient coupling system of tire rubber pellet pyrolysis and waste incineration generator set according to claim 1 is characterized by: The waste incinerator (9) is a mechanical grate incinerator or a fluidized bed incinerator.

3. The working method of the environmentally friendly and efficient coupling system of tire rubber pellet pyrolysis and waste incineration power generation set according to claim 1 is characterized in that: The following steps are involved: S1. Waste tire rubber pellets enter the pyrolyzer (2) through the rubber pellet feed hopper (1) to undergo pyrolysis reaction to generate pyrolysis carbon black and an oil-gas mixture. The pyrolysis carbon black is initially stored in the carbon black silo (3). The oil-gas mixture is separated into pyrolysis oil and pyrolysis gas after passing through the oil-gas separation device (4). The pyrolysis oil is temporarily stored in the oil collecting tank (5), and the pyrolysis gas is temporarily stored in the gas storage tank (6). A portion of the pyrolysis gas is burned to provide the pyrolysis heat required for the pyrolysis in the pyrolyzer (2), and the other portion of the pyrolysis gas and the pyrolysis oil enter the pyrolysis product coupling waste incineration power generation module; S2, the pyrolysis oil is sent to the waste incinerator (9) through the oil burner (7) to be coupled with the waste for combustion, and another part of the pyrolysis gas is sent to the waste incinerator (9) through the gas burner (8) to be coupled with the waste for combustion, and the flue gas generated by the coupled combustion of the pyrolysis oil and the pyrolysis gas enters the flue gas purification system (10) for treatment along with the waste incineration flue gas, and the flue gas generated by the combustion of the pyrolysis gas heated by the pyrolysis furnace is also introduced into the flue gas purification system (10) for treatment, and the purified flue gas is discharged into the atmosphere through the chimney (11).

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