CN212457446U - Heating furnace flameout detection protection and relighting device - Google Patents

Abstract

The utility model provides a heating furnace flame-out detection protection and ignition again relates to firing equipment technical field, has solved the heating furnace and has put out a fire and have not detected the means, leans on artifical discovery, has the technical problem of hidden danger. The flameout detection protection and reignition device for the heating furnace comprises a furnace body, wherein an air door and a chimney are arranged on the furnace body, and the device also comprises two fire nozzles, two air supply assemblies and two fire extinguishing monitoring assemblies, wherein the two fire extinguishing monitoring assemblies are respectively arranged in a premixing area and a flame area; the system also comprises a sleeve type tee joint, a switching air valve and a high-pressure fan; the combustible gas sensor is arranged in the chimney; a self-pressurizing high-energy high-frequency igniter arranged in the furnace body and close to the fire nozzle and a flame stabilizer arranged in the induced air area. The utility model has the characteristics of whether put out a fire and in time close the gas in security, ability real-time supervision heating furnace.

Description

Heating furnace flameout detection protection and relighting device

Technical Field

The utility model belongs to the technical field of the firing equipment technique and specifically relates to a flameout detection protection of heating furnace and ignition again are related to.

Background

The oil field heating furnace is a key device for temperature rise and viscosity reduction in the gathering and transportation process, and the well station heating furnace mostly uses oil field associated gas (casing gas) as fuel and adopts a natural ventilation mode for combustion. As shown in fig. 1, a natural ventilation heating furnace currently used in oil fields adjusts or closes sleeve air through a manual valve set 1 to adjust the air supply amount of a burner 3, adjusts the air amount through a manual air door 3 to generate a flame zone 4, the heat generated by combustion is transmitted to a fire tube 5 through radiation and convection, is transmitted to softened water 6 through the fire tube 5, is transmitted to heated crude oil in the tube through a coil pipe 7, and finally is discharged to the atmosphere through a chimney 9. The chimney must have a certain height to ensure natural ventilation. In the operation process, after flameout, the manual valve group 1 is found and closed through manual inspection, the manual air door 3 is fully opened to purge the sleeve air in the fire tube, the fire tube is manually fed through a portable rechargeable high-pressure ignition gun (not marked in the figure) during ignition, the manual valve group 1 and the manual air door 2 are opened, and the rechargeable high-pressure ignition gun is successfully ignited and retreated.

The applicant finds that at least the following technical problems exist in the prior art:

(1) flame extinguishment is easy to cause due to the fact that sleeve gas contains light oil and water, the wind is strong, a chimney is blocked and the like, and frequent reignition mode has to be adopted; (2) after the heating furnace is flamed out in the operation process, the manual air inlet valve cannot be closed in time, so that combustible gas exists in the fire tube, when the heating furnace is re-ignited, the natural induced draft mode is adopted, the air door is manually opened before the ignition for natural ventilation, the complete discharge of fuel in the fire tube is judged by experience, the explosion and chamber explosion accidents are easy to occur, and the personal safety of an oil extractor is seriously influenced; (3) in the operation process of the heating furnace, due to a flameless detection means, the fire is completely discovered by manual inspection after being extinguished, if the fire is not discovered in time, the station entering temperature is low, the wellhead return pressure is high, the yield is influenced, and the potential safety hazard of wellhead packing leakage is increased; (4) the heating furnace needs manual fire adjustment due to unstable air pressure and frequent change of flame length specification, but the manual fire adjustment mode easily causes over-high or over-low heating of the heating furnace, and the risk of leakage of a high packing with low temperature rise and back pressure is high; the excessive temperature rise not only causes a large amount of waste of natural gas, but also causes dry burning of a jacket water vaporization smoke pipe of the water jacket furnace or coking of a coil pipe of the vertical fire tube furnace to generate safety accidents.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a heating furnace flame-out detects protection and ignition again to the heating furnace that exists among the solution prior art puts out a fire and does not have the detection means, leans on artifical discovery, has the technical problem of hidden danger.

In order to achieve the above purpose, the utility model provides a following technical scheme:

the utility model provides a heating furnace flame-out detection protection and relighting device, which comprises a furnace body, wherein the furnace body is provided with an air door and a chimney, and further comprises a fire nozzle, an air supply component and a fire extinguishing monitoring component, wherein the fire nozzle is fixed in the furnace body and is close to the position of the air door, the air supply component is connected with a fire nozzle pipeline, a flame zone is formed at the front side of the fire nozzle, and a gas-air premixing zone is formed at the rear side of the fire nozzle; the fire extinguishing monitoring assemblies are two in number and are respectively installed in the premixing area and the flame area.

On the basis of the technical scheme, the utility model discloses can also do following improvement.

As a further improvement, the utility model discloses a two the detection method that monitoring subassembly that puts out a fire adopted different principles judges to putting out a fire.

As a further improvement of the utility model, two the monitoring subassembly of putting out a fire is respectively including setting up ion type flame probe in the flame district is in with the setting ultraviolet flame detector in the pre-mixing district.

As a further improvement of the utility model, the air supply subassembly includes air supply pipe, motorised valve and solenoid valve, the motorised valve with the solenoid valve sets up in proper order on the air supply pipe.

As a further improvement of the present invention, the electric valve is a rotary stroke electric valve; the electromagnetic valve is a straight-stroke quick-cut electromagnetic valve.

As a further improvement, the utility model also comprises a sleeve type tee joint, a switching air valve and a high pressure draught fan, the air door the switching air valve and the high pressure draught fan are respectively connected on the three ports of the sleeve type tee joint.

As a further improvement of the utility model, the device also comprises a combustible gas sensor arranged in the chimney.

As a further improvement of the utility model, the utility model also comprises a self-pressurizing high-energy high-frequency igniter which is arranged in the furnace body and is close to the fire nozzle.

As a further improvement of the utility model, still including setting up mix in the district in advance respectively with the air door with the flame holder that the burner is connected, through adjusting the air quantity that mixes with the gas in the flame holder is adjusted the profile and the length in flame district.

As a further improvement, the utility model also comprises a control component, the control component with the fire extinguishing monitoring component the air supply component switch the blast gate high pressure positive blower the combustible gas sensor with high frequency igniter electric connection.

Compared with the prior art, the utility model following beneficial effect has:

the utility model provides a heating furnace flame-out detection protection and relighting device changes natural induced draft blowing into forced air blowing, and when lighting a fire, forced air blowing can set blowing time according to furnace volume, ensures fundamentally to eliminate furnace because of natural gas gathers, ignites in the twinkling of an eye and causes the detonation accident;

the utility model provides a heating furnace flame-out detection protection and relighting device, through installing the flame stabilizer in the premixing area, can adjust the mixing ratio of air and gas to adjust flame profile and length, avoid flame to lick the pipe that burns and cause the pipe explosion accident;

the utility model provides a heating furnace flame-out detection protection and relighting device, through increasing the flame detector and interlocking with automatic gas valves program, flame signal disappears no prior signal in 10 seconds, cuts off the gas valves automatically, prevents that the furnace gas from gathering after putting out a fire, causes the chamber explosion accident when relighting;

the utility model provides a heating furnace flame-out detection protection and ignition again through increasing fixed ignition, adopt the remote control ignition mode, guarantee safe distance, ensure personal safety.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic diagram of a prior art natural draft furnace;

FIG. 2 is a schematic structural view of the flame-out detection protection and re-ignition device of the heating furnace of the present invention;

FIG. 3 is a sectional view of the flame holder and the burner of the flame-out detection protection and reignition device of the present invention;

FIG. 4 is a front view of the flame holder and burner of the flame-out detection protection and reignition device of the present invention.

In figure 1, a manual valve group; 2. a manual damper; 3. a burner; 31. a flame stabilizing port; 4. a flame zone; 5. a fire tube; 6. softening water; 7. a coil pipe; 9. a chimney; 10. a gas supply pipe; 11. an electrically operated valve; 12. an electromagnetic valve; 13. A combustible gas sensor; 14. forcibly purging the pipeline; 15. switching an air valve; 16. a blower; 17. an ultraviolet flame detector; 18. a high frequency igniter; 19. an ionic flame probe; 20. a flame stabilizer; 201. a gas nozzle mounting base; 202. a laval velocity nozzle; 2021. an air inlet; 100. a furnace body; 200. a damper; 300. a gas supply assembly; 400. fire suppression monitoring assembly.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The utility model provides a combustible gas replacement detects and chain protection, flame intensity detects in the operation, cuts off the gas supply valves rapidly after putting out fire and forces the air supply technique to eliminate the heating furnace flame-out detection protection and the ignition device again that the potential safety hazard combines together, including furnace body 100, be provided with air door 200 and chimney 9 on the furnace body 100, still include burner 3, gas supply subassembly 300 and fire monitoring subassembly 400, burner 3 is that the ejector type combustor is fixed in furnace body 100 and is close to air door 200 position, and gas supply subassembly 300 is connected with burner 3 pipeline and is used for continuously supplying gas to burner 3, and burner 3 front side forms flame zone 4, and burner 3 rear side forms gas air premixing district; the fire extinguishing monitoring assemblies 400 are two in number and are respectively installed in the premixing area and the flame area 4.

The utility model discloses in, in order to guarantee the stability of gas pressure, when sleeve pipe air pressure is not enough, the gas that the usable oil well beam-pumping unit of air supply was taken out is used as the gas of heating furnace.

In order to avoid erroneous judgment during monitoring, the two fire extinguishing monitoring assemblies 400 respectively adopt detection methods with different principles to judge flameout.

Specifically, the two fire suppression monitoring assemblies 400 each include an ionic flame probe 19 disposed within the flame zone 4 and an ultraviolet flame detector 17 disposed within the premixing zone. The ionic flame probe 19 is used for monitoring the temperature of the flame zone 4, the ultraviolet flame detector 17 is used for detecting the temperature of the premixing zone, and when the detected temperatures of the ionic flame probe and the ultraviolet flame detector are both lower than or higher than a fire extinguishing threshold value, the gas valve group is cut off or the high-frequency igniter 18 is closed.

The utility model discloses an ion type flame probe 19 in flame district, the ultraviolet flame detector 17 in gas air premix district, redundancy ratio selects two kinds of different principle detection methods to judge flame-out, the motorised valve 11 of the quick cut-off solenoid valve 12 and the gyration stroke of closing the straight stroke after flame-out, and force the air supply to sweep and judge the displacement combustible gas proportion through detecting combustible gas concentration, and the gas that takes out through reciprocating stroke about the oil pumping unit of oil well is as the ignition of air supply stroke self-pressurizing combustion-supporting high energy high frequency, the operation of lighting again after flame-out, the potential safety hazard of natural draft oil field heating furnace in ignition has been avoided, the operation, the existence after flame-out.

As shown in fig. 2, the air supply assembly 300 includes an air supply pipe 10, an electric valve 11, and an electromagnetic valve 12, and the electric valve 11 and the electromagnetic valve 12 are sequentially disposed on the air supply pipe 10. And the sequence position of the electric valve 11 and the electromagnetic valve 12 is fixed and can not be reversed, when the fire extinguishing monitoring assembly 400 monitors that the flame is extinguished, the control assembly controls the electromagnetic valve 12 to be closed first, and then the electric valve 11 is closed in sequence.

Furthermore, the electric valve 11 is an electric valve for a rotation stroke; the electromagnetic valve 12 is a straight-stroke quick-cut electromagnetic valve, a straight-stroke quick-cut electromagnetic valve and a rotary-stroke electric valve, so that the problem that the pure electromagnetic valve is not tightly closed easily due to organic impurities contained in oil field casing gas is solved, impurities can be pushed by the rotary electric valve through the rotation of a valve core, the straight-stroke quick-close of the electromagnetic valve and the rotary slow-close technology of the electric valve can be overcome, and the problem that a gas valve is not tightly closed can be further overcome. Both the electric valve 11 and the electromagnetic valve 12 are commercially available as prior art products.

Further, in order to ensure that the gas valve bank is closed tightly and no gas is leaked, a lead-out type online combustible gas monitoring system is installed at the outlet of the gas valve bank, namely the rear part of the electromagnetic valve 12, after the valve bank is closed, whether the valve bank is closed tightly or not can be judged, and when the valve bank is not closed tightly, the electromagnetic valve 12 is closed sequentially by adopting a program control technology and the electric valve 11 is closed in a delayed mode so as to judge whether the electromagnetic valve 12 or the electric valve 11 is not closed tightly.

As shown in fig. 2, the three-way air valve further comprises a sleeve type three-way valve, a switching air valve 15 and a high-pressure fan, wherein the air door 200, the switching air valve 15 and the high-pressure fan are respectively connected to three ports of the sleeve type three-way valve. Wherein the high pressure fan is a blower 16. The three-way pipe is also the forced purging pipe 14. When the interior of the hearth needs to be purged, the switching air valve 15 can be closed, and the interior of the hearth is forcibly purged through the forced purging pipeline 14 and the air door 200 by using the air blower 16; when ignition natural ventilation is needed, the air blower 16 is closed, the switching air valve 15 is opened, so that external natural air enters the hearth through the forced purging pipeline 14 through the air door 200 to be premixed with gas and air, and then ignition is carried out.

The utility model discloses a natural draft and forced purging combine the method, be in current natural draft air door department promptly, install bushing type tee bend additional, forced air supply high pressure positive blower and switch blast gate, through, when the heating furnace operation, still adopt the natural draft combustion mode, when igniteing again, adopt to start high pressure positive blower and sweep to judge the sleeve pipe gas displacement rate through combustible gas concentration sensor.

As shown in fig. 2, a combustible gas sensor 13 is also included, which is disposed within the chimney 9.

And a self-pressurizing high-energy high-frequency igniter 18 which is arranged in the furnace body 100 and close to the burner 3. The ignition device is installed and fixed, and automatic ignition is adopted, so that the problem that the casualty accident is caused because the body is too close to an ignition region and the explosion cannot be avoided in time because a portable ignition gun is manually extended into a hearth for ignition is solved.

Still including setting up flame holder 20 of being connected with air door 200 and burner 3 respectively in premixing the district, through flame holder 20 air-conditioning and gas mixing proportion to adjust the profile and the length of the flame zone 4 of 3 the place ahead formation of burner, the utility model provides a flame holder 20 is the spin that is specially researched and developed according to the oil field natural air supply heating furnace flame characteristic, mixes district installation flame holder in advance, makes flame profile, length controllable, eliminates flame and licks the pipe that burns and cause local overheated explosion accident. The structure of the flame stabilizer 20 is as shown in fig. 3 and fig. 4, and comprises a gas nozzle mounting base 201 and a laval velocity nozzle 202, the left end of the gas nozzle mounting base 201 is connected with the air door 200 through a connecting piece, the outer side of the other end is provided with an external thread section which is in threaded connection with the laval velocity nozzle 202, a passage for gas to flow is arranged inside the gas nozzle mounting base 201, 8 gas inlets 2021 are arranged on the outer wall of the front part of the laval velocity nozzle 202 along the circumferential direction, the gas inlets 2021 are blocked by using parts so as to adjust the amount of air entering the nozzle, thereby adjusting the mixing ratio of gas and air, the passage for gas to flow inside the laval velocity nozzle 202 is a structure with two large ends and a small middle part, thereby the gas inside the position close to the gas inlets 2021 forms negative pressure, and the air outside the nozzle can be introduced into; the structure of the burner 3 is as shown in fig. 3 and 4, the burner 3 is in threaded connection with the Laval speed nozzle 202 through a connecting piece, a plurality of stable flame ports 31 are uniformly arranged on the front side of the burner 3 along the circumferential direction, a cavity of a stepped structure is arranged inside the left side of the burner 3, the stepped cavity is changed from large to small, the right side of the stepped cavity is of a hollow cylindrical structure, the stable flame ports 31 are located on the burner 3 at the position of the hollow cylindrical structure, external air enters through the stable flame ports 31, and flame stability is maintained.

The fire extinguishing monitoring device further comprises a control assembly, and the control assembly is electrically connected with the fire extinguishing monitoring assembly 400, the gas supply assembly 300, the switching air valve 15, the high-pressure fan, the combustible gas sensor 13 and the high-frequency igniter 18.

The specific using method comprises the following steps:

when the ultraviolet flame detector 17 and the ionic flame probe 19 reach the flame intensity flameout threshold at the same time, a valve group consisting of the electric valve 11 and the electromagnetic valve 12 is automatically closed, the air blower 16 is started to forcibly blow residual gas in the fire tube 5 by switching the air valve 15, the air valve 15 is switched to a natural ventilation state after the combustible gas sensor 13 cannot detect combustible gas, the electric valve 11 and the electromagnetic valve 12 are automatically opened, the self-pressurization high-energy high-frequency igniter 18 is electrified to generate ignition fire, after the fire nozzle 3 enters air, the ultraviolet flame detector 17 and the ionic flame probe 19 reach flame at the same time, the self-pressurization high-energy high-frequency igniter 18 is powered off for standby, the heating furnace normally operates, and the profile and the length of the flame area 4 are adjusted through the rotational flow generated by the flame stabilizer 20.

It should be noted that "inward" is a direction toward the center of the accommodating space, and "outward" is a direction away from the center of the accommodating space.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship indicated based on the orientation or positional relationship shown in fig. 1, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. The heating furnace flameout detection protection and re-ignition device is characterized by comprising a furnace body, wherein an air door and a chimney are arranged on the furnace body, the heating furnace further comprises a fire nozzle, an air supply assembly and a fire extinguishing monitoring assembly, the fire nozzle is fixed in the furnace body and is close to the air door, the air supply assembly is connected with a pipeline of the fire nozzle, a flame zone is formed on the front side of the fire nozzle, and a gas-air pre-mixing zone is formed on the rear side of the fire nozzle; the fire extinguishing monitoring assemblies are two in number and are respectively installed in the premixing area and the flame area.

2. The furnace misfire detection protection and re-ignition device as recited in claim 1 wherein the two fire suppression monitoring assemblies determine misfire using detection methods of different principles.

3. The furnace misfire detection protection and re-ignition apparatus as recited in claim 2 wherein both of the fire suppression monitoring assemblies respectively comprise an ionic flame probe disposed within the flame zone and an ultraviolet flame detector disposed within the premixing zone.

4. The furnace flameout detection protection and re-ignition device of claim 3, wherein the gas supply assembly comprises a gas supply tube, an electric valve and an electromagnetic valve, and the electric valve and the electromagnetic valve are sequentially disposed on the gas supply tube.

5. The furnace flameout detection protection and re-ignition device as claimed in claim 4, wherein the electric valve is a rotary travel electric valve; the electromagnetic valve is a straight-stroke quick-cut electromagnetic valve.

6. The heating furnace flameout detection protection and re-ignition device according to any one of claims 1 to 5, further comprising a sleeve type tee joint, a switching air valve and a high pressure fan, wherein the air door, the switching air valve and the high pressure fan are respectively connected to three ports of the sleeve type tee joint.

7. The furnace misfire detection protection and re-ignition apparatus as recited in claim 6 further comprising a combustible gas sensor disposed within the chimney.

8. The furnace misfire detection protection and re-ignition device as recited in claim 7 further comprising a self-boosting high energy hf igniter disposed within the furnace body proximate the burner tip.

9. The furnace flameout detection protection and re-ignition device according to any one of claims 1 to 5, further comprising a flame holder disposed in the premixing zone and connected to the damper and the burner, respectively, wherein the profile and length of the flame zone are adjusted by adjusting the amount of air mixed with the gas in the flame holder.

10. The furnace flameout detection protection and reignition device according to claim 8, further comprising a control component, wherein the control component is electrically connected to the fire extinguishing monitoring component, the gas supply component, the switching damper, the high pressure blower, the combustible gas sensor, and the hf igniter.

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