CN216303710U - Safety and stability supply system for waste tire pyrolysis furnace fuel gas - Google Patents
Safety and stability supply system for waste tire pyrolysis furnace fuel gas Download PDFInfo
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- CN216303710U CN216303710U CN202122723442.7U CN202122723442U CN216303710U CN 216303710 U CN216303710 U CN 216303710U CN 202122723442 U CN202122723442 U CN 202122723442U CN 216303710 U CN216303710 U CN 216303710U
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- 238000000197 pyrolysis Methods 0.000 title claims abstract description 40
- 239000002737 fuel gas Substances 0.000 title claims abstract description 36
- 239000010920 waste tyre Substances 0.000 title claims abstract description 26
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 174
- 239000007789 gas Substances 0.000 claims abstract description 107
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 83
- 238000002485 combustion reaction Methods 0.000 claims abstract description 33
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 22
- 230000001105 regulatory effect Effects 0.000 claims abstract description 18
- 230000001276 controlling effect Effects 0.000 claims abstract description 7
- 230000001502 supplementing effect Effects 0.000 claims abstract description 5
- 239000003915 liquefied petroleum gas Substances 0.000 claims description 13
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 239000002910 solid waste Substances 0.000 abstract description 2
- 239000000446 fuel Substances 0.000 description 6
- 230000008901 benefit Effects 0.000 description 3
- 239000006229 carbon black Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/141—Feedstock
- Y02P20/143—Feedstock the feedstock being recycled material, e.g. plastics
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- Gasification And Melting Of Waste (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
A safe and stable fuel gas supply system of a scrap tire pyrolyzing furnace belongs to the technical field of harmless and resource utilization of solid wastes. The device comprises a gas combustion module, a heat supply module and a heat supply module, wherein the gas combustion module is used for combusting and pyrolyzing non-condensable gas to provide heat for pyrolyzing the waste tire and consists of a combustion furnace, a switch valve, a flame arrester and a flowmeter; the pyrolysis noncondensable gas pipeline consists of a switch valve and a one-way valve; a nitrogen pipeline for providing nitrogen for the system; supplementing a gas source, and taking the gas source as a gas source during furnace start; the fuel gas heat value regulating and controlling module is used for regulating the heat value of the fuel gas and meeting the requirement of complete combustion of the fuel gas of the combustion furnace; the gas pressure stabilizing module is used for providing stable-pressure gas for the combustion furnace and comprises a tank body, an elastic air bag, a pyrolysis non-condensable gas inlet, a gas outlet, a supplementary gas inlet, a drain outlet, an elastic air bag nitrogen inlet, an elastic air bag nitrogen outlet, a tank body pressure gauge and an elastic air bag pressure gauge. The system of the utility model is simple and compact, has high automation degree and is easy to copy and popularize.
Description
Technical Field
The utility model relates to the technical field of harmless and resource utilization of solid wastes, in particular to a safe and stable fuel gas supply system of a waste tire pyrolysis furnace.
Background
The pyrolysis of the waste tire has the characteristics of large treatment capacity, high benefit, small environmental pollution and the like, accords with the concept of resource recycling, and is considered to be one of the best ways for treating the waste tire at present. The pyrolysis products of the waste tires mainly comprise pyrolysis oil, pyrolysis carbon black and noncondensable combustible gas, wherein the noncondensable combustible gas can be used as fuel gas for combustion to provide or supplement heat required by the pyrolysis process.
The existing pyrolysis technology for the waste tire pyrolysis can meet the requirement of heat required by pyrolysis, but the amount of pyrolysis gas can fluctuate, so that the combustion pressure of a combustion furnace is unstable. In order to ensure the stability of the air supply pressure of the combustion furnace, a floating roof tank with larger volume is generally arranged, the pressure in the floating roof tank is increased, and the pressure is reduced by a pressure reducing valve to meet the combustion pressure of the combustion furnace. The floating roof tank equipment is large, the safety requirement is high, and meanwhile auxiliary equipment with related pressurization needs to be added.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a safe and stable fuel gas supply system of a waste tire pyrolysis furnace, which adopts an elastic air bag type pressure stabilizing tank and combines a back pressure type nitrogen supply valve and a nitrogen discharge valve to realize safe and stable fuel gas supply of a combustion furnace.
In order to achieve the above object, the present invention provides a safe and stable fuel gas supply system for a scrap tire pyrolyzing furnace, comprising:
the gas combustion module is used for providing heat for the pyrolysis of the waste tire by combusting and pyrolyzing the non-condensable gas and consists of a combustion furnace, a switch valve, a flame arrester and a flowmeter;
the pyrolysis noncondensable gas pipeline consists of a switch valve and a one-way valve;
a nitrogen pipeline for providing nitrogen for the system;
supplementing a gas source, and taking the gas source as a gas source during furnace start;
the fuel gas heat value regulating and controlling module is used for regulating the heat value of the fuel gas and meeting the requirement of complete combustion of the fuel gas of the combustion furnace;
the gas pressure stabilizing module is used for providing stable-pressure gas for the combustion furnace and comprises a tank body, an elastic air bag, a pyrolysis non-condensable gas inlet, a gas outlet, a supplementary gas inlet, a drain outlet, an elastic air bag nitrogen inlet, an elastic air bag nitrogen outlet, a tank body pressure gauge and an elastic air bag pressure gauge.
For convenience of transportation, the supplementary gas source is preferably liquefied petroleum gas and is transported in a gas tank.
The heat value of the pyrolysis noncondensable gas of the waste tire is generally 40-50 MJ/Nm3And the heat value of the liquefied petroleum gas is 90MJ/Nm3The theoretical amount of air required for combustion is different between the two. Although the existing burner has a certain range of adjustment for air distribution, the existing burner can not burn both non-condensable gas and liquefied petroleum gas. Preferably, a fuel gas heat value regulating and controlling module is arranged, and the heat value of the liquefied petroleum gas is reduced to be close to that of the pyrolysis non-condensable gas by mixing nitrogen with the liquefied petroleum gas. And during the furnace starting, diluted liquefied petroleum gas is used as fuel. In order to accurately control the heating value of the fuel, the preferable fuel heating value regulating module comprises a flow meter and a one-way valve which can adjust the flow rate of the supplementary fuel side, and a flow meter and a one-way valve which can adjust the flow rate of the nitrogen side. The flowmeter can be automatically adjusted according to a set value and can be remotely controlled.
In order to realize the pressure stability of the gas pressure stabilizing module, preferably, a nitrogen inlet of an elastic air bag in the gas pressure stabilizing module is formed by connecting two paths in parallel, one path is controlled by a ball valve, and the other path is controlled by a back pressure type nitrogen supply valve; the nitrogen outlet of the elastic air bag in the gas pressure stabilizing module is connected in series with a ball valve and a back pressure type nitrogen discharging valve.
In order to ensure that the backpressure nitrogen supply valve and the backpressure nitrogen discharge valve work together to keep the pressure of the fuel gas pressure stabilizing module stable, preferably, the set pressure of the backpressure nitrogen discharge valve is 100-200 Pa higher than that of the backpressure nitrogen supply valve, and the backpressure nitrogen supply valve and the backpressure nitrogen discharge valve are both check valves.
In order to reduce the complexity of the system and reduce a control loop, the backpressure type nitrogen supply valve and the backpressure type nitrogen discharge valve belong to mechanical automatic valves. When the back pressure of the back pressure type nitrogen supply valve is lower than a set value, the valve is opened, and when the back pressure of the back pressure type nitrogen supply valve is higher than the set value, the valve is closed; when the pressure in front of the valve is higher than a set value, the valve is opened, and when the pressure is lower than the set value, the valve is closed.
In order to stabilize the pressure of the combustion furnace, the pressure range of the gas pressure stabilizing module is preferably 12-15 kPa.
In order to avoid forming mixed gas of gas and air in the gas pressure stabilizing module tank body, preferably, before starting the furnace, the ball valve of the nitrogen outlet of the elastic air bag is closed, the blowoff valve is opened to charge nitrogen into the elastic air bag, and the air in the tank body is exhausted; and then opening the elastic air bag nitrogen outlet ball valve, injecting gas into the tank body by using the gas heat value regulating module, and stopping injecting the gas when the side pressure of the tank body expresses to a set value.
In order to reduce the running cost, preferably, the nitrogen filled in the elastic air bag can be replaced by compressed air.
When the non-condensable gas generated by pyrolysis of the waste tire enters the tank body, the non-condensable gas amount fluctuates, preferably, when the non-condensable gas amount is reduced, the pressure in the tank body is reduced, the side pressure of the elastic air bag is also reduced at the moment, and the back pressure type nitrogen supply valve is opened to supply nitrogen gas into the elastic air bag, so that the pressure in the tank body is stable; on the contrary, when the amount of the pyrolysis non-condensable gas is increased, the pressure in the tank body is increased, the side pressure of the elastic air bag is also increased at the moment, and the back pressure type nitrogen discharging valve is opened to discharge nitrogen in the elastic air bag, so that the pressure in the tank body is stable.
During furnace shutdown, in order to improve the safety of the gas pressure stabilizing module, preferably, during furnace shutdown, the ball valve of the nitrogen outlet of the elastic air bag is closed, the nitrogen inlet valve of the elastic air bag is opened, nitrogen is filled into the air bag, and the gas in the tank body is extruded.
Compared with the prior art, the utility model has the advantages that:
the utility model can realize safe and stable gas supply of the waste tire pyrolyzing furnace, and has simple and compact system and high automation degree.
Drawings
Fig. 1 is a schematic view of a safe and stable fuel gas supply system of a scrap tire pyrolysis furnace according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described with reference to the following embodiments and accompanying drawings. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments without any inventive step, are within the scope of protection of the utility model.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of the word "comprise" or "comprises", and the like, in the context of this application, is intended to mean that the elements or items listed before that word, in addition to those listed after that word, do not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
Examples
Referring to fig. 1, the system for safely and stably supplying fuel gas to a scrap tire pyrolyzing furnace in the present embodiment includes: the system comprises a gas combustion module 1, a pyrolysis non-condensable gas pipeline 2, a nitrogen pipeline 3, a supplementary gas source 4, a gas calorific value regulating module 5 and a gas pressure stabilizing module 6.
The gas combustion module is used for combusting and pyrolyzing non-condensable gas to provide heat for pyrolyzing the waste tire and comprises a combustion furnace, a switch valve, a flame arrester and a flowmeter; the pyrolysis noncondensable gas pipeline consists of a switch valve and a one-way valve; a nitrogen pipeline for providing nitrogen for the system; supplementing a gas source, and taking the gas source as a gas source during furnace start; the fuel gas heat value regulating and controlling module is used for regulating the heat value of the fuel gas and meeting the requirement of complete combustion of the fuel gas of the combustion furnace; the gas pressure stabilizing module is used for providing stable-pressure gas for the combustion furnace and comprises a tank body 6a, an elastic air bag 6b, a pyrolysis non-condensable gas inlet, a gas outlet, a supplementary gas inlet, a drain outlet, an elastic air bag nitrogen inlet, an elastic air bag nitrogen outlet, a tank body side pressure gauge and an elastic air bag side pressure gauge.
In order to facilitate transportation, the supplementary gas source is liquefied petroleum gas and is transported in a gas tank mode.
The heat value of the pyrolysis noncondensable gas of the waste tire is generally 40-50 MJ/Nm3And the heat value of the liquefied petroleum gas is 90MJ/Nm3The theoretical amount of air required for combustion is different between the two. Although the existing burner has a certain range of adjusting air distribution, the existing burner cannot achieve the purposes of burning and not condensingThe gas can also burn liquefied petroleum gas. And a fuel gas heat value regulating and controlling module is arranged, and the heat value of the liquefied petroleum gas is reduced to be close to that of the pyrolysis non-condensable gas by mixing nitrogen gas into the liquefied petroleum gas. And during the furnace starting, diluted liquefied petroleum gas is used as fuel.
In order to accurately control the heat value of the fuel, the fuel gas heat value regulating and controlling module comprises a valve group 5a with the flow rate adjustable on the supplementary fuel gas side and a valve group 5b with the flow rate adjustable on the nitrogen gas side. The flow can be automatically adjusted according to a set value and can be remotely controlled.
In order to realize the pressure stability of the gas pressure stabilizing module, an elastic air bag nitrogen inlet in the gas pressure stabilizing module is formed by connecting two paths in parallel, one path is controlled by a ball valve 6d, and the other path is controlled by a back pressure type nitrogen supply valve 6 c; and an elastic air bag nitrogen outlet valve group 6e in the gas pressure stabilizing module is formed by serially connecting a ball valve and a back pressure type nitrogen discharging valve.
In order to ensure that the backpressure nitrogen supply valve and the backpressure nitrogen discharge valve work together to keep the pressure of the fuel gas pressure stabilizing module stable, the set pressure of the backpressure nitrogen discharge valve is 200Pa higher than that of the backpressure nitrogen supply valve, and the backpressure nitrogen supply valve and the backpressure nitrogen discharge valve are both check valves.
In order to reduce the complexity of the system and reduce a control loop, the backpressure type nitrogen supply valve and the backpressure type nitrogen discharge valve belong to mechanical automatic valves. When the back pressure of the back pressure type nitrogen supply valve is lower than a set value, the valve is opened, and when the back pressure of the back pressure type nitrogen supply valve is higher than the set value, the valve is closed; when the pressure in front of the valve is higher than a set value, the valve is opened, and when the pressure is lower than the set value, the valve is closed.
In order to stabilize the pressure of the combustion furnace, the pressure range of the gas pressure stabilizing module is 13 kPa.
In order to avoid forming mixed gas of gas and air in the gas pressure stabilizing module tank body, before the furnace is started, the elastic air bag nitrogen outlet ball valve is closed, the blow-down valve is opened to charge nitrogen into the elastic air bag, and the air in the tank body is discharged; and then opening the elastic air bag nitrogen outlet ball valve, injecting gas into the tank body by using the gas heat value regulating module, and stopping injecting the gas when the side pressure of the tank body expresses to a set value.
When the non-condensable gas generated by pyrolysis of the waste tire enters the tank body, the non-condensable gas amount fluctuates, and the non-condensable gas amount is reduced, the pressure in the tank body is reduced, the side pressure of the elastic air bag is also reduced at the moment, and the back pressure type nitrogen supply valve is opened to supply nitrogen gas into the elastic air bag, so that the pressure in the tank body is stable; on the contrary, when the amount of the pyrolysis non-condensable gas is increased, the pressure in the tank body is increased, the side pressure of the elastic air bag is also increased at the moment, and the back pressure type nitrogen discharging valve is opened to discharge nitrogen in the elastic air bag, so that the pressure in the tank body is stable.
When the furnace is shut down, in order to improve the safety of the gas pressure stabilizing module, the ball valve of the nitrogen outlet of the elastic air bag is closed, the nitrogen inlet valve of the elastic air bag is opened, nitrogen is filled into the air bag, and the gas in the tank body is extruded.
Claims (9)
1. A safe and stable fuel gas supply system of a scrap tire pyrolyzing furnace is characterized by comprising:
the gas combustion module is used for providing heat for the pyrolysis of the waste tire by combusting and pyrolyzing the non-condensable gas and consists of a combustion furnace, a switch valve, a flame arrester and a flowmeter;
the pyrolysis noncondensable gas pipeline consists of a switch valve and a one-way valve;
a nitrogen pipeline for providing nitrogen for the system;
supplementing a gas source, and taking the gas source as a gas source during furnace start;
the fuel gas heat value regulating and controlling module is used for regulating the heat value of the fuel gas and meeting the requirement of complete combustion of the fuel gas of the combustion furnace;
the gas pressure stabilizing module is used for providing stable-pressure gas for the combustion furnace and comprises a tank body, an elastic air bag, a pyrolysis non-condensable gas inlet, a gas outlet, a supplementary gas inlet, a drain outlet, an elastic air bag nitrogen inlet, an elastic air bag nitrogen outlet, a tank body pressure gauge and an elastic air bag pressure gauge.
2. The system for safely and stably supplying fuel gas to the pyrolysis furnace of waste tires according to claim 1, wherein the supplementary fuel gas source is liquefied petroleum gas.
3. The system of claim 1, wherein the gas heating value regulating module regulates the heating value of the gas using nitrogen, wherein the gas heating value regulating module comprises a flow meter and a check valve for supplementing the adjustable flow rate of the gas side, and a flow meter and a check valve for the adjustable flow rate of the nitrogen side.
4. The system of claim 1, wherein the elastic air bag nitrogen inlet of the gas pressure stabilizing module is controlled by a ball valve, and one of the elastic air bag nitrogen inlet is controlled by a back pressure type nitrogen supply valve.
5. The system for safely and stably supplying the fuel gas to the pyrolysis furnace of the waste tires according to claim 1, wherein a nitrogen gas outlet of an elastic air bag in the fuel gas pressure stabilizing module is connected in series with a ball valve and a back pressure type nitrogen discharge valve.
6. The system of claim 1, wherein the back pressure type nitrogen discharge valve is set to be higher than the back pressure type nitrogen supply valve by 100 to 200 Pa.
7. The system for safely and stably supplying the fuel gas to the pyrolysis furnace of the waste tires as claimed in claim 1, wherein before the furnace is started, the ball valve of the nitrogen gas outlet of the elastic air bag is closed, the blowoff valve is opened to charge the nitrogen gas into the elastic air bag and discharge the air in the tank body; and then opening the elastic air bag nitrogen outlet ball valve, injecting gas into the tank body by using the gas heat value regulating module, and stopping injecting the gas when the side pressure of the tank body expresses to a set value.
8. The system for safely and stably supplying the fuel gas to the pyrolysis furnace of the waste tire as claimed in claim 1, wherein after the furnace is started, the pyrolysis noncondensable gas enters the tank body, when the pyrolysis noncondensable gas amount fluctuates and the yield is reduced, the pressure in the tank body is reduced, the side pressure of the elastic air bag is also reduced at the moment, and the backpressure type nitrogen supply valve is opened to supply nitrogen gas into the elastic air bag, so that the pressure in the tank body is stable; on the contrary, when the amount of the pyrolysis non-condensable gas is increased, the pressure in the tank body is increased, the side pressure of the elastic air bag is also increased at the moment, and the back pressure type nitrogen discharging valve is opened to discharge nitrogen in the elastic air bag, so that the pressure in the tank body is stable.
9. The system of claim 1, wherein the ball valve of the nitrogen outlet of the elastic air bag is closed and the nitrogen inlet valve of the elastic air bag is opened to charge nitrogen into the air bag and extrude the fuel gas in the tank when the furnace is stopped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122723442.7U CN216303710U (en) | 2021-11-09 | 2021-11-09 | Safety and stability supply system for waste tire pyrolysis furnace fuel gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122723442.7U CN216303710U (en) | 2021-11-09 | 2021-11-09 | Safety and stability supply system for waste tire pyrolysis furnace fuel gas |
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| Publication Number | Publication Date |
|---|---|
| CN216303710U true CN216303710U (en) | 2022-04-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122723442.7U Active CN216303710U (en) | 2021-11-09 | 2021-11-09 | Safety and stability supply system for waste tire pyrolysis furnace fuel gas |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216303710U (en) |
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2021
- 2021-11-09 CN CN202122723442.7U patent/CN216303710U/en active Active
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