CN117072966A - Backfire-preventing combustion system and method for combustible mixed gas - Google Patents
Backfire-preventing combustion system and method for combustible mixed gas Download PDFInfo
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- CN117072966A CN117072966A CN202311156277.9A CN202311156277A CN117072966A CN 117072966 A CN117072966 A CN 117072966A CN 202311156277 A CN202311156277 A CN 202311156277A CN 117072966 A CN117072966 A CN 117072966A
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 94
- 238000000034 method Methods 0.000 title claims description 18
- 238000005520 cutting process Methods 0.000 claims abstract description 54
- 238000005496 tempering Methods 0.000 claims abstract description 33
- 238000009841 combustion method Methods 0.000 claims abstract description 9
- 239000007789 gas Substances 0.000 claims description 394
- 230000000740 bleeding effect Effects 0.000 claims description 31
- 230000002265 prevention Effects 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 8
- 238000005507 spraying Methods 0.000 claims description 5
- 239000002737 fuel gas Substances 0.000 claims description 2
- 239000000446 fuel Substances 0.000 claims 1
- 206010016754 Flashback Diseases 0.000 description 12
- 230000000694 effects Effects 0.000 description 4
- 230000000979 retarding effect Effects 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000004200 deflagration Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
- F23D14/82—Preventing flashback or blowback
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Feeding And Controlling Fuel (AREA)
Abstract
The invention discloses a combustion system and a combustion method for preventing backfire of combustible mixed gas, wherein the combustion system for preventing backfire of the combustible mixed gas comprises: the device comprises a combustor, a combustible mixed gas generating device, a non-combustible mixed gas generating device, a combustible mixed gas conveying pipeline, a non-combustible mixed gas conveying pipeline, a gas conveying main pipeline, a first manual valve, a diffusing unit, a combustible gas quick-cutting valve, a second manual valve and a non-combustible gas quick-cutting valve. The combustion system and the combustion method for preventing the backfire of the combustible mixed gas can be suitable for seamless and safe switching of the combustible gas and the nonflammable gas in the pipeline when the combustion equipment burns normally; the gas flow rate in the front end pipeline of the combustion equipment and the position of the combustible gas nozzle are always kept certain, the combustible gas flow rate is always larger than the tempering speed, and the combustion safety is ensured.
Description
Technical Field
The invention relates to the field of combustion heating equipment, in particular to a combustion system and a combustion method for preventing backfire of combustible mixed gas.
Background
In combustion heating equipment for industrial production, pre-mixed combustible gas (such as gas and air are mixed and hydrogen and oxygen are mixed) is used for combustion, and when the device is started or stopped or switched, the mixed combustible gas can cause residual gas in a tempering pipe and a gas supply device to cause deflagration due to pressure loss in a pipeline when the device is started or stopped or switched.
Tempering can cause damage to equipment on the pipeline, air supply equipment, and personnel, resulting in safety accidents.
The patent number CN201820907542 discloses a blowing oxyhydrogen flame anti-backfire device, including non-combustible gas air source device, check valve, normally closed solenoid valve and normally open solenoid valve, wherein concatenate on the combustible gas air supply circuit between oxyhydrogen gas generating device and combustor by a check valve and normally open solenoid valve, concatenate into a non-combustible gas pressure circuit by another check valve, normally closed solenoid valve and non-combustible gas air source device, insert in the preceding check valve on the combustible gas air supply circuit, characterized by: the combustible gas supply loop is characterized in that a light transmission part is further arranged in front of the one-way valve of the combustible gas supply loop, an electronic photosensitive device is arranged on the outer side of the light transmission part, the electronic photosensitive device is connected with the detection signal input end of the control circuit, and the control signal output end of the control circuit is connected with the control end of the normally open electromagnetic valve. Solves the problem that the prior art can not play a role in preventing backfire when flameout is unpredictable due to certain faults.
The patent number CN201822149378 discloses an oxyhydrogen metal cutting system, which comprises an oxyhydrogen generating device, a gas stabilizing constant-pressure device, a burning gun nozzle, an anti-backfire device, a fire retarding device and a control center, wherein the anti-backfire device and the fire retarding device are arranged on the burning gun nozzle, and the fire retarding device comprises a light-transmitting window, a photosensitive sensor and a first electromagnetic valve which are arranged on a pipeline of the burning gun nozzle; the backfire preventing device comprises a non-combustible gas source, a one-way valve and a second electromagnetic valve, and the second electromagnetic valve is connected with the non-combustible gas source through a pipeline. The tempering prevention device and the fire retarding device are added in the use process, so that the safety is improved.
The schemes of the two patents adopt photosensitive signals to control the switching and the opening of the valve, the gas source used by the schemes of the two patents is oxyhydrogen gas, the burning speed of the oxyhydrogen gas can reach hundreds of meters per second, the photosensitive signals are fed back to the electromagnetic valve in time, and the electromagnetic valve is possibly tempered to gas production equipment due to certain delay in the opening and closing actions of the electromagnetic valve.
It can be seen that the existing tempering prevention method is a method for presetting a flame arrester or a water seal flame arrester on a pipeline. The two anti-backfire methods have a certain flame retardant effect on the combustible mixed gas with a slower flame propagation speed, but have poor effect due to the faster flame propagation speed when dealing with the combustible mixed gas with a faster flame propagation speed (such as the mixed gas of hydrogen and oxygen). In addition, the prior art solves the problem that certain potential safety hazards exist after tempering occurs.
Therefore, there is a need for a combustion system and a combustion method for preventing flashback of combustible mixed gas, which can solve the problems before flashback occurs.
Disclosure of Invention
The invention mainly solves the technical problem of providing a combustion system and a combustion method for preventing backfire of combustible mixed gas, which can realize seamless and safe switching of the combustible gas and the nonflammable gas in a pipeline when combustion equipment burns normally and effectively prevent backfire.
In order to solve the technical problems, the invention adopts a technical scheme that: provided is a burnable mixed gas flashback prevention combustion system, including: the device comprises a combustor, a combustible mixed gas generating device, a non-combustible mixed gas generating device, a combustible mixed gas conveying pipeline, a non-combustible mixed gas conveying pipeline and a gas conveying main pipeline;
one end of the gas conveying main pipeline is communicated with the gas inlet of the burner, the other end of the gas conveying main pipeline is communicated with the combustible mixed gas generating device through a combustible mixed gas conveying pipeline, and the other end of the gas conveying main pipeline is also communicated with the non-combustible mixed gas generating device through a non-combustible mixed gas conveying pipeline;
a first manual valve, a diffusing unit and a combustible gas quick-cutting valve are sequentially arranged on the combustible mixed gas conveying pipeline in the direction from the combustible mixed gas generating device to the burner;
and a second manual valve and a non-combustible gas quick-cut valve are sequentially arranged on the non-combustible mixed gas conveying pipeline in the direction from the non-combustible mixed gas generating device to the burner.
In a preferred embodiment of the present invention, a combustible gas pressure protection interlocking device is further installed on the combustible gas mixture conveying pipeline, and the combustible gas pressure protection interlocking device is installed between the combustible gas mixture generating device and the first manual valve;
the non-combustible mixed gas conveying pipeline is also provided with a non-combustible gas pressure protection interlocking device, and the non-combustible gas pressure protection interlocking device is arranged between the non-combustible mixed gas generating device and the second manual valve;
and a lowest tempering pressure interlocking device is arranged on the gas conveying main pipeline.
In a preferred embodiment of the present invention, a first check valve is further installed on the combustible mixed gas delivery pipe, and the first check valve is installed between the burner and the combustible gas quick-cut valve;
a second check valve is also mounted on the non-combustible mixed gas delivery conduit, the second check valve being mounted between the burner and the non-combustible gas quick-cut valve.
In a preferred embodiment of the present invention, the diffusing unit includes a diffusing pipeline communicated with the combustible mixed gas conveying pipeline, and a third manual valve and a diffusing quick-cut valve are sequentially installed on the diffusing pipeline.
In a preferred embodiment of the present invention, the non-flammable gas quick-cut valve, the flammable gas quick-cut valve and the bleeding quick-cut valve are controlled in a linkage manner;
when the non-combustible gas quick-cutting valve is opened, the combustible gas quick-cutting valve is in a linkage closing state, and the bleeding quick-cutting valve is in a linkage opening state; when the combustible gas quick-cutting valve is opened, the bleeding quick-cutting valve is in a linkage closing state, and the non-combustible gas quick-cutting valve is in linkage closing.
In a preferred embodiment of the present invention, the non-combustible gas quick-cut valve, the combustible gas quick-cut valve and the bleeding quick-cut valve are electric quick-cut valves or pneumatic quick-cut valves.
In a preferred embodiment of the present invention, the combustible mixed gas generating device is capable of continuously generating a combustible mixed gas at a certain pressure, and the non-combustible mixed gas generating device is capable of continuously generating a non-combustible mixed gas at a certain pressure.
In order to solve the technical problems, the invention adopts another technical scheme that: the combustion method for preventing the backfire of the combustible mixed gas is provided, and the combustion system is used and comprises the following control procedures:
the start-up procedure: opening the combustible mixed gas generating device and the non-combustible mixed gas generating device, opening a first manual valve and a second manual valve which are arranged on the combustible mixed gas conveying pipeline, opening a non-combustible gas quick-cutting valve, closing a combustible gas quick-cutting valve, and opening the diffusing unit; the pipeline between the combustible gas quick-cutting valve and the combustion nozzle of the combustor is filled with non-combustible gas; under a certain pressure, the non-combustible gas is sprayed out through a combustion nozzle of the burner, and the tempering speed of the non-combustible gas is higher than that of the combustible gas; meanwhile, the combustible mixed gas is discharged to a safety area through a diffusing unit in a continuous gas feeding state of the combustible mixed gas generating device;
switching program: the combustible mixed gas keeps a certain conveying pressure, when the combustion of the combustible mixed gas needs to be switched, the combustible gas quick-cutting valve is opened, the diffusing unit is closed, and the non-combustible gas quick-cutting valve is closed; at the moment, the combustible mixed gas is pushed by the pressure, the residual non-combustible gas in the pipeline between the combustible gas quick-cut valve and the combustion nozzle is completely discharged from the combustion nozzle of the burner, and the subsequent combustible gas in the pipeline enters the combustion nozzle of the burner to perform normal combustion; the gas spraying speed at the whole combustion nozzle is always kept larger than the tempering speed of the combustible mixed gas;
the non-combustible mixed gas equipment keeps a certain pressure, the non-combustible gas quick-cutting valve is opened, the combustible gas quick-cutting valve is closed, the diffusing unit is opened, at the moment, the non-combustible mixed gas pushes the residual combustible gas between the combustion nozzle of the burner and the combustible gas quick-cutting valve under the action of the pressure, the residual combustible gas is discharged from the combustion nozzle of the burner, and the gas spraying speed of the whole combustion nozzle is always kept to be greater than the tempering speed of the combustible mixed gas; the combustible gas is discharged to a safety area through a diffusing quick-cutting valve.
In a preferred embodiment of the present invention, the diffusing unit includes a diffusing pipeline communicated with the combustible mixed gas conveying pipeline, and a third manual valve and a diffusing quick-cut valve sequentially installed on the diffusing pipeline;
the non-combustible gas quick-cutting valve, the combustible gas quick-cutting valve and the bleeding quick-cutting valve are controlled in a linkage manner;
when the non-combustible gas quick-cutting valve is opened, the combustible gas quick-cutting valve is in a linkage closing state, and the bleeding quick-cutting valve is in a linkage opening state;
when the combustible gas quick-cutting valve is opened, the bleeding quick-cutting valve is in a linkage closing state, and the non-combustible gas quick-cutting valve is in linkage closing.
In a preferred embodiment of the present invention, a combustible gas pressure protection interlocking device is further installed on the combustible gas mixture conveying pipeline, and the combustible gas pressure protection interlocking device is installed between the combustible gas mixture generating device and the first manual valve;
the non-combustible mixed gas conveying pipeline is also provided with a non-combustible gas pressure protection interlocking device, and the non-combustible gas pressure protection interlocking device is arranged between the non-combustible mixed gas generating device and the second manual valve;
a lowest tempering pressure interlocking device is arranged on the gas conveying main pipeline;
when the non-combustible gas pressure protection pressure interlocking device detects that the pressure is lower than a set value during starting, the system defaults to be unsafe and can not normally start combustion;
when the system is started, the system defaults to be unsafe and can not normally start combustion when the combustible gas pressure protection interlocking device detects that the pressure is lower than a set value;
and when the lowest tempering pressure interlocking device and the combustible gas pressure protection interlocking device detect that the pressure is lower than a set value during normal combustion after opening, the lowest tempering pressure interlocking device and the combustible gas pressure protection interlocking device default to have tempering risk, and then a closing program is executed.
The beneficial effects of the invention are as follows: the combustion system and the combustion method for preventing the backfire of the combustible mixed gas have the following advantages:
(1) The seamless and safe switching of the combustible mixed gas and the nonflammable mixed gas in the pipeline during normal combustion of the combustion equipment is realized. Specifically, when the fuel gas quick-cut valve is started, a pipeline between the combustor and the combustion nozzle is filled with non-combustible gas. At a certain pressure, the non-combustible gas is ejected through the combustion nozzle of the burner, producing a tempering speed greater than that of the combustible gas. Meanwhile, the combustible mixed gas is discharged to a safety area through the diffusing unit in a continuous gas supply state of the combustible mixed gas generating device. When the gas is switched, the gas is pushed by the pressure, the residual non-combustible gas in the gas pipeline from the quick-cut valve to the combustion nozzle is discharged from the combustion nozzle of the burner, and the subsequent combustible gas in the pipeline enters the combustion nozzle of the burner to perform normal combustion. When the gas valve is closed, the non-combustible mixed gas pushes the residual combustible gas between the combustion nozzle of the burner and the combustible gas quick-cutting valve under the pressure effect, is discharged from the combustion nozzle of the burner, and the gas spraying speed of the whole combustion nozzle is always kept to be larger than the tempering speed of the combustible mixed gas. The subsequent non-combustible gas in the pipeline performs a replacement cleaning on the whole pipeline. The combustible gas is discharged to the safety area through the diffusing unit.
(2) The gas flow rate in the front end pipeline of the combustion equipment and the position of the combustible gas nozzle are always kept certain, the combustible gas flow rate is always larger than the tempering speed, and the combustion safety is ensured.
(3) The pressure linkage protection of the combustible mixed gas and the non-combustible mixed gas is arranged on the pipeline, so that the combustion safety is ensured.
Drawings
FIG. 1 is a schematic diagram of a combustion system for preventing flashback of combustible mixed gas according to a preferred embodiment of the invention;
the components in the drawings are marked as follows: 1-burner, 11-air inlet, 12-combustion nozzle, 2-combustible mixed gas generating device, 3-non-combustible mixed gas generating device, 4-combustible mixed gas conveying pipeline, 41-combustible gas pressure protection interlocking device, 42-first manual valve, 43-diffusing unit, 431-diffusing pipeline, 432-third manual valve, 433-diffusing quick-cut valve, 44-combustible gas quick-cut valve, 45-first check valve, 5-non-combustible mixed gas conveying pipeline, 51-non-combustible gas pressure protection interlocking device, 52-second manual valve, 54-non-combustible gas quick-cut valve, 55-second check valve, 6-gas conveying main pipeline, and,
61-minimum tempering pressure interlocking device.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making clear and defining the scope of the present invention.
Referring to fig. 1, an embodiment of the present invention includes:
a burnable mixed gas flashback resistant combustion system, comprising: a burner 1, a combustible mixed gas generating device 2, a non-combustible mixed gas generating device 3, a combustible mixed gas conveying pipeline 4, a non-combustible mixed gas conveying pipeline 5 and a gas conveying main pipeline 6.
The burner 1 comprises an air inlet 11 and a combustion nozzle 12. The combustible mixed gas generating device 2 can continuously generate the combustible mixed gas with a certain pressure, and the non-combustible mixed gas generating device 3 can continuously generate the non-combustible mixed gas with a certain pressure.
One end of the gas conveying main pipeline 6 is communicated with the gas inlet 11 of the combustor 1, the other end of the gas conveying main pipeline 6 is communicated with the combustible mixed gas generating device 2 through a combustible mixed gas conveying pipeline 4, and the other end of the gas conveying main pipeline 6 is also communicated with the non-combustible mixed gas generating device 3 through a non-combustible mixed gas conveying pipeline 5. That is, the combustible mixed gas delivery pipe 4 may deliver the combustible mixed gas generated by the combustible mixed gas generating device 2 to the gas delivery main pipe 6 and finally to the burner 1. The non-combustible mixed gas delivery pipe 5 may deliver the non-combustible mixed gas generated by the non-combustible mixed gas generating device 3 to the gas delivery main pipe 6 and finally to the burner 1.
A combustible gas pressure protection interlocking device 41, a first manual valve 42, a diffusing unit 43, a combustible gas quick-cut valve 44, and a first check valve 45 are mounted in this order on the combustible gas conveying line 4 in the direction from the combustible gas generating device 2 to the burner 1. The first check valve 45 is used to prevent the mixed gas from flowing back toward the combustible mixed gas generating device 2. The combustible gas pressure protection interlocking device 41 is used for ensuring that the pressure of the combustible mixed gas generated by the combustible mixed gas generating device 2 is higher than a certain pressure. Specifically, when the combustion system is started, the combustible gas pressure protection pressure interlocking device detects that the gas pressure in the combustible mixed gas conveying pipeline 4 is lower than a set value, the system defaults to be unsafe, and the combustion cannot be started normally. The bleeding unit 43 includes a bleeding pipe 431 connected to the combustible mixture delivery pipe 4, and a third manual valve 432 and a bleeding quick-cut valve 433 sequentially installed on the bleeding pipe 431.
A non-combustible gas pressure protection interlocking device 4151, a second manual valve 52, a non-combustible gas quick-cut valve 54, and a second check valve 55 are mounted in this order on the non-combustible gas delivery line 5 in the direction from the non-combustible gas generating device 3 to the burner 1. The second check valve 55 is used to prevent the mixed gas from flowing back toward the non-combustible mixed gas generating device 3. The non-combustible gas pressure protection interlocking device 51 is used for ensuring that the pressure of the non-combustible mixed gas generated by the non-combustible mixed gas generating device 3 is higher than a certain pressure. Specifically, when the non-combustible gas pressure protection pressure interlocking device 51 detects that the gas pressure in the non-combustible mixed gas conveying pipeline 5 is lower than a set value when the combustion system is started, the system defaults to be unsafe, and the combustion cannot be started normally.
Preferably, to prevent an operation error, the non-combustible gas quick-cut valve 54, the combustible gas quick-cut valve 44, and the bleeding quick-cut valve 433 are controlled in linkage. When the non-flammable gas quick-cut valve 54 is opened, the flammable gas quick-cut valve 44 is in a interlocked closed state and the bleeding quick-cut valve 433 is in an interlocked open state. When the combustible gas quick-cut valve 44 is opened, the bleeding quick-cut valve is in a interlocked closed state, and the non-combustible gas quick-cut valve 54 is interlocked closed. The non-flammable gas quick-cut valve 54, the flammable gas quick-cut valve 44, and the bleed quick-cut valve 433 may be electric quick-cut valves or pneumatic quick-cut valves.
A minimum tempering pressure interlocking device 61 is mounted on the gas delivery main pipe 6. The lowest flashback pressure interlock device 61 and the combustible gas pressure protection interlock device 41 use a combined monitoring and flashback prevention function. When the pressure detected by one of the lowest flashback pressure interlocking device 61 and the combustible gas pressure protection interlocking device 41 is lower than the set value, the flashback risk is defaulted, and the closing procedure is executed.
The working process of the combustion system for preventing the backfire of the combustible mixed gas is as follows:
1. the start-up procedure: the combustible mixed gas generating device 2 and the non-combustible mixed gas generating device 3 are opened to respectively generate the combustible mixed gas and the non-combustible mixed gas with certain pressure, and the combustible gas pressure protection interlocking device 41 and the non-combustible gas pressure protection interlocking device 41 respectively ensure the stable pressure of the combustible mixed gas and the non-combustible mixed gas. All manual valves are opened, including a first manual valve 42 mounted on the combustible mixed gas delivery line 4, a second manual valve 52 on the non-combustible mixed gas delivery line 5, and a third manual valve 432 mounted on the bleeding line. The non-flammable gas quick-cut valve 54 is opened, and at this time, the flammable gas quick-cut valve 44 is in a interlocked closed state, and the bleeding quick-cut valve 433 is in an interlocked open state. The gas quick-cut valve 44 fills the pipe between the burner 1 and the combustion nozzle 12 with non-combustible gas. At a certain pressure, the non-combustible gas is ejected through the burner ports 12 of the burner 1, resulting in a tempering speed greater than the combustible gas. Meanwhile, the combustible mixed gas is discharged to the safety area through the diffusion quick cut valve 433 in the continuously supplied gas state of the combustible mixed gas generating device 2.
2. Switching program: the combustible gas keeps a certain conveying pressure, when the combustion of the combustible mixed gas needs to be switched, the combustible gas quick-cutting valve 44 is opened, the diffusing quick-cutting valve is in a linkage closing state, and the non-combustible gas quick-cutting valve 54 is in linkage closing. At this time, the combustible gas is pushed by the pressure to discharge all the residual non-combustible gas in the pipeline from the quick-cut valve 44 to the combustion nozzle 12, and the subsequent combustible gas in the pipeline enters the combustion nozzle 12 of the burner 1 to perform normal combustion. The gas ejection speed at the entire combustion nozzle 12 is always kept greater than the flashback speed of the combustible mixed gas. Meanwhile, the pressure protection is performed by the combustible gas pressure protection interlocking device 41, and when the output pressure of the combustible gas generating device 2 is lower than a set value, a shut-down routine is started. The specific shutdown procedure is shown in the following three shutdown procedures.
3. The closing program (manual closing or closing by the gas pressure protection interlocking device 41) is that the non-gas device keeps a certain pressure and the non-gas pressure protection interlocking device 41. The non-flammable gas cut-off valve 54 is opened, the flammable gas cut-off valve 44 is interlocked closed, and the bleed cut-off valve is interlocked opened. At this time, the non-combustible mixed gas pushes the combustible gas remaining between the combustion nozzle 12 of the burner 1 and the combustible gas quick-cut valve 44 due to the pressure effect, and the combustible gas is discharged from the combustion nozzle 12 of the burner 1, and the gas discharge speed at the whole combustion nozzle 12 is always kept greater than the tempering speed of the combustible mixed gas. The subsequent non-combustible gas in the pipeline performs a replacement cleaning on the whole pipeline. The combustible gas is discharged to a safety area through a diffusing quick-cutting valve.
The combustion system and the combustion method for preventing the backfire of the combustible mixed gas have the following advantages:
(1) The seamless and safe switching of the combustible mixed gas and the nonflammable mixed gas in the pipeline during normal combustion of the combustion equipment is realized.
(2) The combustible mixed gas generating device 2 and the non-combustible mixed gas generating device 3 always provide combustible mixed gas or non-combustible mixed gas with certain pressure, so that certain gas flow rates in a front end pipeline of the combustion equipment and at a combustible gas nozzle are ensured to be always kept, the combustible gas flow rate is always higher than tempering speed, and combustion safety is ensured.
(3) The pressure linkage protection of the combustible mixed gas and the non-combustible mixed gas is arranged on the pipeline, so that the combustion safety is ensured. A combustible gas pressure protection interlocking device 41 is arranged on the combustible mixed gas conveying pipeline 4; a non-combustible gas pressure protection interlocking device 51 is arranged on the non-combustible mixed gas conveying pipeline 5; a minimum tempering pressure interlock 61 is mounted on the gas delivery manifold 6. When the non-combustible gas pressure protection pressure interlocking device 51 detects that the pressure is lower than a set value during starting, the system defaults to be unsafe and can not normally start combustion; when the combustible gas pressure protection interlocking device 41 detects that the pressure is lower than a set value during starting, the system defaults to be unsafe and can not normally start combustion; when the pressure detected by one of the lowest flashback pressure interlock device 61 and the flammable gas pressure protection interlock device 41 is lower than the pressure set point, the flashback risk is defaulted, and the closing procedure is executed. The pressure set point should be slightly greater than the tempering pressure value, for example, if the gas pressure is lower than 1Mpa, the pressure set point should be 1.2Mpa greater than the tempering pressure value. If the pressure is below 1.2Mpa but still above 1Mpa, there is a default risk of tempering.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present invention.
Claims (10)
1. A burnable mixed gas flashback prevention combustion system, comprising: a burner (1), a combustible mixed gas generating device (2), a non-combustible mixed gas generating device (3), a combustible mixed gas conveying pipeline (4), a non-combustible mixed gas conveying pipeline (5) and a gas conveying main pipeline (6);
one end of the gas conveying main pipeline (6) is communicated with the gas inlet (11) of the combustor (1), the other end of the gas conveying main pipeline (6) is communicated with the combustible mixed gas generating device (2) through a combustible mixed gas conveying pipeline (4), and the other end of the gas conveying main pipeline (6) is also communicated with the non-combustible mixed gas generating device (3) through a non-combustible mixed gas conveying pipeline (5);
a first manual valve (42), a diffusing unit (43) and a combustible gas quick-cut valve (44) are sequentially arranged on the combustible mixed gas conveying pipeline (4) in the direction from the combustible mixed gas generating device (2) to the burner (1);
a second manual valve (52) and a non-combustible gas quick-cut valve (54) are sequentially arranged on the non-combustible mixed gas conveying pipeline (5) in the direction from the non-combustible mixed gas generating device (3) to the combustor (1).
2. The burnable mixed gas flashback prevention combustion system according to claim 1, wherein a burnable gas pressure protection interlocking device (41) is further installed on the burnable mixed gas conveying pipeline (4), and the burnable gas pressure protection interlocking device (41) is installed between the burnable mixed gas generating device (2) and the first manual valve (42);
a non-combustible gas pressure protection interlocking device (51) is further arranged on the non-combustible mixed gas conveying pipeline (5), and the non-combustible gas pressure protection interlocking device (51) is arranged between the non-combustible mixed gas generating device (3) and the second manual valve (52);
a lowest tempering pressure interlocking device (61) is arranged on the gas conveying main pipeline (6).
3. The burnable mixed gas flashback prevention combustion system according to claim 1, wherein a first check valve (45) is further installed on the burnable mixed gas delivery pipe (4), and the first check valve (45) is installed between the burner (1) and a burnable gas quick cut valve (44);
a second check valve (55) is also arranged on the non-combustible mixed gas conveying pipeline (5), and the second check valve (55) is arranged between the burner (1) and the non-combustible gas quick-cutting valve (54).
4. The burnable mixed gas flashback prevention combustion system according to claim 1, wherein the bleeding unit (43) includes a bleeding pipe (431) communicating with the burnable mixed gas delivery pipe (4), a third manual valve (432) and a bleeding quick-cut valve (433) mounted on the bleeding pipe (431) in sequence.
5. The burnable mixed gas flashback prevention combustion system according to claim 4, wherein the non-burnable gas quick cut valve (54), the burnable gas quick cut valve (44) and the bleeding quick cut valve (433) are controlled in a linkage manner;
when the non-combustible gas quick-cutting valve (54) is opened, the combustible gas quick-cutting valve (44) is in a linkage closing state, and the bleeding quick-cutting valve (433) is in a linkage opening state; when the flammable gas quick-cut valve (44) is opened, the bleeding quick-cut valve (433) is in a linkage closing state, and the non-flammable gas quick-cut valve (54) is in linkage closing.
6. The burnable mixed gas flashback prevention combustion system according to claim 4, wherein the non-burnable gas quick cut valve (54), the burnable gas quick cut valve (44), and the bleeding quick cut valve (433) are electric quick cut valves or pneumatic quick cut valves.
7. The burnable mixed gas flashback prevention combustion system according to claim 1, wherein the burnable mixed gas generating device (2) is capable of continuously generating a burnable mixed gas of a certain pressure, and the non-burnable mixed gas generating device (3) is capable of continuously generating a non-burnable mixed gas of a certain pressure.
8. A method of flame-out prevention of a combustible mixed gas as claimed in claim 1, wherein the combustion system is used, the combustion system comprising the following control program:
the start-up procedure: opening the combustible mixed gas generating device (2) and the non-combustible mixed gas generating device (3), opening a first manual valve (42) and a second manual valve (52) which are arranged on the combustible mixed gas conveying pipeline (4) and the non-combustible mixed gas conveying pipeline (5), opening a non-combustible gas quick-cutting valve (54), closing a combustible gas quick-cutting valve (44), and opening the diffusing unit (43); the gas-free-cutting valve (44) is filled with non-combustible gas in a pipeline between the gas-free-cutting valve (44) and the combustion nozzle (12) of the burner (1), and the non-combustible gas is sprayed out through the combustion nozzle (12) of the burner (1) under a certain pressure to generate a tempering speed larger than that of the combustible gas;
switching program: the combustible mixed gas keeps a certain conveying pressure, when the combustion of the combustible mixed gas needs to be switched, a combustible gas quick-cutting valve (44) is opened, the diffusing unit (43) is closed, and a non-combustible gas quick-cutting valve (54) is closed; at the moment, the combustible mixed gas is pushed by the pressure, the residual non-combustible gas in the pipeline between the combustible gas quick-cutting valve (44) and the combustion nozzle (12) is completely discharged from the combustion nozzle (12) of the burner (1), and the subsequent combustible gas in the pipeline enters the combustion nozzle (12) of the burner (1) to perform normal combustion; the gas spraying speed of the whole combustion nozzle (12) is always kept to be larger than the tempering speed of the combustible mixed gas;
the non-combustible mixed gas equipment keeps a certain pressure, a non-combustible gas quick-cutting valve (54) is opened, a combustible gas quick-cutting valve (44) is closed, a diffusing unit (43) is opened, at the moment, the non-combustible mixed gas pushes residual combustible gas between a combustion nozzle (12) of a combustor (1) and the combustible gas quick-cutting valve (44) under the action of the pressure, the residual combustible gas is discharged from the combustion nozzle (12) of the combustor (1), and the gas spraying speed of the whole combustion nozzle (12) is always kept to be larger than the tempering speed of the combustible mixed gas; the combustible gas is discharged to a safety area through a diffusing quick-cutting valve.
9. The burnout preventing combustion method of the combustible mixed gas according to claim 8, wherein the bleeding unit (43) includes a bleeding pipe (431) communicating with the combustible mixed gas delivery pipe (4), a third manual valve (432) and a bleeding quick-cut valve (433) mounted in sequence on the bleeding pipe (431);
the non-combustible gas quick-cutting valve (54), the combustible gas quick-cutting valve (44) and the bleeding quick-cutting valve (433) are controlled in a linkage manner;
when the non-combustible gas quick-cutting valve (54) is opened, the combustible gas quick-cutting valve (44) is in a linkage closing state, and the bleeding quick-cutting valve (433) is in a linkage opening state;
when the flammable gas quick-cut valve (44) is opened, the bleeding quick-cut valve (433) is in a linkage closing state, and the non-flammable gas quick-cut valve (54) is in linkage closing.
10. The burnout prevention method for a burnout prevention flashback of a burnout gas mixture according to claim 8, characterized in that a burnout gas pressure protection interlocking device (41) is further installed on the burnout gas mixture delivery pipe (4), the burnout gas pressure protection interlocking device (41) being installed between the burnout gas mixture generating device (2) and the first manual valve (42);
a non-combustible gas pressure protection interlocking device (51) is further arranged on the non-combustible mixed gas conveying pipeline (5), and the non-combustible gas pressure protection interlocking device (51) is arranged between the non-combustible mixed gas generating device (3) and the second manual valve (52);
a lowest tempering pressure interlocking device (61) is arranged on the gas conveying main pipeline (6);
when the non-combustible gas pressure protection pressure interlocking device (51) detects that the pressure is lower than a set value during starting, the system defaults to be unsafe and can not normally start combustion;
when the system is started, the system is defaulted to be unsafe and can not normally start combustion when the combustible gas pressure protection interlocking device (41) detects that the pressure is lower than a set value;
when the fuel is normally burned after being started, one of the lowest tempering pressure interlocking device (61) and the fuel gas pressure protection interlocking device (41) detects that the pressure is lower than a set value, and a closing program is executed if tempering risk exists by default.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311156277.9A CN117072966A (en) | 2023-09-08 | 2023-09-08 | Backfire-preventing combustion system and method for combustible mixed gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311156277.9A CN117072966A (en) | 2023-09-08 | 2023-09-08 | Backfire-preventing combustion system and method for combustible mixed gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117072966A true CN117072966A (en) | 2023-11-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311156277.9A Pending CN117072966A (en) | 2023-09-08 | 2023-09-08 | Backfire-preventing combustion system and method for combustible mixed gas |
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| Country | Link |
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| CN (1) | CN117072966A (en) |
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- 2023-09-08 CN CN202311156277.9A patent/CN117072966A/en active Pending
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