CN110360560A - Natural gas combustion combustion-supporting device - Google Patents

Abstract

The invention discloses a natural gas combustion-supporting device, and belongs to the field of oilfield equipment. The combustion-supporting device of natural gas burning includes injection subassembly and igniter, through setting up shrink chamber and diffusion chamber in injection subassembly, form negative pressure zone at the junction (in the connecting pipe) in shrink chamber and diffusion chamber when making the natural gas pass through, and produce certain suction effect, further through set up the suction hole with external intercommunication on the connecting pipe, make can aspirate external air when the natural gas passes through and enter into the connecting pipe, the natural gas enters into the diffusion chamber after mixing with the air in the connecting pipe, and further intensive mixing in the diffusion chamber, under the condition of starting igniter, the mixed gas of natural gas and air can be in the gas outlet department of blast pipe sufficient burning, air pollution has been prevented, the potential safety hazard has been avoided.

Description

Natural gas combustion combustion-supporting device

technical field

The invention relates to the field of oilfield equipment, in particular to a combustion-supporting device for natural gas combustion.

Background technique

During the development of oil fields, the output of oil is generally accompanied by natural gas. If the natural gas is directly discharged into the atmosphere, the toxic gases such as hydrogen sulfide contained in the natural gas will cause air pollution; and if the natural gas in the air reaches a certain concentration, It is very easy to explode and cause a fire accident. Therefore, for oil-associated natural gas, combustion treatment is generally required.

In the prior art, the domestic treatment method for oil-associated natural gas is mainly to use the pipeline outlet as a combustion head, and use an electronic lighter to ignite the natural gas discharged from the pipeline.

In the process of realizing the present invention, the inventor has found that there are at least the following problems in the prior art:

In the prior art, when the pipeline outlet is used as the combustion head for ignition and combustion, affected by the discharge flow and velocity of natural gas, the discharged natural gas and air cannot be fully mixed, resulting in insufficient combustion of natural gas, and part of the natural gas will escape into the atmosphere and cause air pollution. Pollution presents certain potential safety hazards.

Contents of the invention

In view of this, the present invention provides a natural gas combustion combustion-supporting device capable of fully mixing natural gas and air, which can solve the above technical problems.

Specifically, the following technical solutions are included:

A natural gas combustion combustion-supporting device is provided, the combustion-supporting device includes: an injection assembly and an igniter, wherein,

The injection assembly includes an air intake pipe, a connecting pipe and an exhaust pipe connected in sequence, the air intake pipe is provided with a constriction cavity that narrows toward the connecting pipe, and the exhaust pipe is provided with a diffuser chamber that expands away from the connecting pipe. cavity, the constriction cavity communicates with the diffusion cavity through the connecting tube;

The connecting pipe is also provided with a suction hole for communicating with the outside world;

The igniter is arranged at the gas outlet of the exhaust pipe.

In a possible design, the injection assembly further includes: a nozzle, the nozzle is arranged in the air intake pipe;

The lumen of the air intake pipe communicates with the inner hole of the nozzle to form the constriction chamber.

In a possible design, the injection assembly further includes: a connecting sleeve, the connecting sleeve is arranged at the connection between the intake pipe and the connecting pipe, the connecting sleeve is provided with an installation hole, and the nozzle set in the mounting hole.

In a possible design, the constriction cavity is a truncated conical cavity directly formed in the intake pipe.

In a possible design, the diffusion chamber includes a first sub-chamber and a second sub-chamber that communicate with each other, and the inner diameter of the second sub-chamber is larger than the inner diameter of the first sub-chamber;

In a possible design, the injection assembly further includes a throat, and the throat is arranged in the first sub-chamber.

In a possible design, the diffusion chamber is a truncated conical cavity directly formed in the exhaust pipe.

In a possible design, the igniter includes: an ignition head and a lead wire, the ignition head is arranged at the gas outlet of the exhaust pipe, and the lead wire is connected to the ignition head.

In a possible design, the combustion-supporting device further includes: a burner head, the burner head is arranged on the exhaust pipe and covers the upper part of the diffusion chamber.

In a possible design, the combustion-supporting device further includes: a windshield, the windshield is sleeved on the outside of the exhaust pipe, and ventilation holes are opened on the windshield.

The beneficial effects of the technical solution provided by the embodiments of the present invention:

An embodiment of the present invention provides a natural gas combustion combustion-supporting device capable of fully mixing natural gas and air. The combustion-supporting device includes an injection assembly and an igniter. By setting a constriction chamber and a diffusion chamber in the injection assembly, a negative pressure zone is formed at the junction of the constriction chamber and the diffusion chamber (in the connecting pipe) when the natural gas passes through, thereby generating a certain amount of suction. Function, further opening a suction hole communicating with the outside world on the connecting pipe, so that when the natural gas passes through, the external air can be sucked into the connecting pipe, and the natural gas and air are mixed in the connecting pipe and then enter the diffusion chamber. And further fully mixed in the diffusion chamber, when the igniter is activated, the mixed gas of natural gas and air can be fully burned at the gas outlet of the exhaust pipe, preventing air pollution and potential safety hazards.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

Fig. 1 is a schematic cross-sectional structure diagram of a natural gas combustion combustion-supporting device provided by an embodiment of the present invention;

Fig. 2 is a schematic cross-sectional structure diagram of another natural gas combustion combustion-supporting device provided by an embodiment of the present invention.

The reference signs in the figure represent respectively:

1. Injection components;

101. Air intake pipe;

102. Connecting pipe;

1021, suction hole;

103. Exhaust pipe;

1031. The first sub-chamber;

1032, the second cavity;

104. Nozzle;

105. Connection sleeve;

1051, mounting holes;

106. Throat;

2. Igniter;

201. Ignition head;

202, lead wire;

3. Furnace head;

4. Windshield;

401, air vent.

Detailed ways

In order to make the technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

An embodiment of the present invention provides a combustion-supporting device for natural gas combustion, the schematic cross-sectional structure of which is shown in FIG. 1 , and the combustion-supporting device includes: an injection assembly 1 and an igniter 2 .

Wherein, the injection assembly 1 includes an intake pipe 101, a connecting pipe 102 and an exhaust pipe 103 connected in sequence, the intake pipe 101 is provided with a constriction chamber that shrinks toward the connecting pipe 102, and the exhaust pipe 103 is provided with a constriction cavity that expands away from the connecting pipe 102. Diffusion chamber, the contraction chamber communicates with the diffusion chamber through the connecting pipe 102;

The connecting pipe 102 is also provided with an air suction hole 1021 for communication with the outside world;

The igniter 2 is arranged at the gas outlet of the exhaust pipe 103 .

It can be understood that the constriction cavity is a cavity structure with a portion with a decreasing inner diameter, and the diffusion cavity is a cavity structure with a portion with an increasing inner diameter.

During application, the air intake pipe 101 of the injection assembly 1 is connected to the nozzle of the oil pipe. When natural gas flows into the intake pipe 101 from the nozzle of the oil pipe, as the inner diameter of the shrinkage chamber shrinks, the pressure of the natural gas continues to rise, and the flow rate also increases continuously. Entering the diffusion chamber, according to the Venturi effect, when the high-speed natural gas enters the diffusion chamber from the connecting pipe 102, a negative pressure zone will be formed at the junction of the contraction chamber and the diffusion chamber (in the connecting pipe 102), thereby generating a certain suction effect , and because the connecting pipe 102 is provided with an air suction hole 1021 communicating with the outside world, under the action of the negative pressure formed in the connecting pipe 102, the outside air can be sucked into the connecting pipe 102, so that the natural gas and air The gas is mixed in the connecting pipe 102, then enters the diffusion chamber, and is further fully mixed in the diffusion chamber. When the igniter 2 is activated, the mixed gas of natural gas and air can be fully burned at the gas outlet of the exhaust pipe 103.

The combustion-supporting device for natural gas combustion provided by the embodiment of the present invention sets a constriction cavity and a diffusion cavity in the injection assembly 1, so that when the natural gas passes through, a negative pressure zone is formed at the junction of the constriction cavity and the diffusion cavity (at the connecting pipe 102), thereby generating a certain The suction effect of the natural gas is further provided on the connecting pipe 102 with a suction hole 1021 communicating with the outside world, so that when the natural gas passes through, the external air can be sucked into the connecting pipe 102, and the natural gas and air are mixed in the connecting pipe 102 After entering the diffusion chamber, and further fully mixed in the diffusion chamber, when the igniter 2 is started, the mixed gas of natural gas and air can be fully burned at the gas outlet of the exhaust pipe 103, preventing air pollution and avoiding safety hazard.

It should be noted that when the restricted fluid passes through the reduced flow section, the flow velocity of the fluid increases, and the flow velocity is inversely proportional to the flow section. According to Bernoulli's law, the increase of flow velocity is accompanied by the increase of fluid pressure. The decrease is the common Venturi effect. In layman's terms, the Venturi effect means that a low pressure will be generated near a fluid flowing at a high speed, thereby generating a suction effect; and the greater the flow velocity, the lower the pressure.

In the above-mentioned natural gas combustion-supporting device, the intake pipe 101 of the injection assembly 1 is provided with a contraction chamber that shrinks toward the connecting pipe 102, and the exhaust pipe 103 is provided with a diffusion chamber that expands away from the connection pipe 102. The contraction chamber and the diffusion chamber The connecting pipe 102 communicates with the air suction hole 1021 communicating with the outside world, which constitutes a Venturi tube structure, thereby generating a Venturi effect.

In addition, compared with the foreign technology of using a combustion furnace to incinerate natural gas, the natural gas combustion combustion-supporting device provided by the embodiment of the present invention also has the advantages of small equipment size, easy portability, low manufacturing cost, and good economy.

Based on the above structure, the components of the natural gas combustion combustion-supporting device of the embodiment of the present invention are described in detail below:

In the combustion-supporting device for natural gas combustion in the embodiment of the present invention, for the intake pipe 101 in the injection assembly 1, the intake pipe 101 functions to introduce natural gas and accelerate the flow velocity of the natural gas. The contraction cavity provided in the intake pipe 101 plays a role in accelerating the flow rate of natural gas, which is a key component of the embodiment of the present invention. In a specific implementation process, the structure of the shrinkage cavity can be arranged in various ways.

In a possible implementation, the injection assembly 1 further includes: a nozzle 104, which is arranged in the air intake pipe 101; the lumen of the air intake pipe 101 communicates with the inner hole of the nozzle 104 to form a contraction cavity, as shown in FIG. 1 , so that the flow rate of the natural gas can be accelerated by flowing through the nozzle 104 .

It should be noted that the inner hole of the nozzle 104 only needs to ensure that the diameter of the inner hole decreases toward the connecting pipe 102 , and the shape of the inner hole of the nozzle 104 is not specifically limited.

For example, the shape of the inner hole may include a connected first cylinder, a first truncated cone and a second cylinder, wherein the diameter of the cross-section of the first cylinder is greater than the diameter of the cross-section of the second cylinder, such as As shown in Fig. 1; the difference in degrees of the cone angles between the upper table and the lower table of the first frustum of conical shape can be 5-10°.

Further, in order to better fix and install the nozzle 104, the injection assembly 1 also includes: a connecting sleeve 105, which is arranged at the connection between the intake pipe 101 and the connecting pipe 102, and the connecting sleeve 105 is provided with an installation hole 1051, and the nozzle 104 is disposed in the mounting hole 1051, as shown in FIG. 1 .

With such an arrangement, different types of nozzles 104 can be replaced, installed and used according to different wells, which facilitates the installation and removal of the nozzles 104 . Since the well pressure of each well is different, the flow rate of natural gas in the tubing is also different, therefore, it is necessary to install or replace the corresponding type of nozzle 104 according to the conditions of different wells. For example, the flow velocity of natural gas in the oil pipe is slow, and the nozzle 104 with a small inner diameter can be selected to increase the flow velocity of natural gas more significantly.

In the natural gas combustion combustion-supporting device of the embodiment of the present invention, the minimum diameter of the inner hole of the nozzle 104 may be 1-10 mm.

In another possible implementation, the constriction cavity may be a truncated conical cavity directly formed in the intake pipe 101. As shown in FIG. The flow velocity of the natural gas in the constriction chamber increases gradually, and reaches the maximum flow velocity when it flows out of the constriction chamber.

With such a setting, multiple intake pipes 101 need to be manufactured according to the requirements of different well pressures. When in use, the operator can select an intake pipe 101 with a shrinkage cavity of a suitable size according to the measured well pressure.

In the natural gas combustion combustion-supporting device of the embodiment of the present invention, for the connecting pipe 102 in the injection assembly 1, the connecting pipe 102 not only plays the role of connecting the intake pipe 101 and the exhaust pipe 103, but also opens the suction hole 1021, Play the role of inhaling air.

As for the suction hole 1021, the number of the suction hole 1021 may be 4-10, which is convenient for the suction of air. In terms of layout, the suction holes 1021 can be symmetrically arranged on the connecting pipe 102, or randomly arranged on the connecting pipe 102, which is not specifically limited in this embodiment of the present invention.

In the combustion-supporting device for natural gas combustion in the embodiment of the present invention, for the exhaust pipe 103 in the injection assembly 1, the exhaust pipe 103 serves to lead out the mixed gas of natural gas and air, and fully mix the mixed gas of natural gas and air. effect. The diffusion chamber provided in the exhaust pipe 103 plays the role of fully mixing natural gas and air, which is also a key component of the embodiment of the present invention. In a specific implementation process, the structure of the diffusion chamber can also be arranged in various ways.

In a possible implementation manner, the diffusion chamber includes a first sub-chamber 1031 and a second sub-chamber 1032 that communicate with each other. The inner diameter of the second sub-chamber 1032 is larger than the inner diameter of the first sub-chamber 1031. The two-part chamber 1032 forms a diffusion chamber, as shown in FIG. 1 , so that the flow rate of the mixture of natural gas and air can be gradually reduced, which is conducive to the full combustion of natural gas.

It should be noted that the shapes of the first sub-cavity 1031 and the second sub-cavity 1032 are not specifically limited, as long as the inner diameter of the second sub-cavity 1032 is larger than the inner diameter of the first sub-cavity 1031 .

For example, in the natural gas combustion combustion-supporting device of the embodiment of the present invention, the first sub-chamber 1031 can be a third cylindrical shape, and the second sub-chamber 1032 can be a connected second frustoconical shape and a fourth cylindrical shape, wherein the first sub-cavity The inner diameter of the three cylinders is the smallest, as shown in Figure 1.

Further, the injection assembly 1 can also include: a throat 106, which is arranged in the first sub-cavity 1031, as shown in Figure 1, the throat 106 can be installed into the first sub-cavity 1031 or from 1031 disassembled.

It is set so that the throat pipe 106 can cooperate with the nozzle 104 to ensure that the mixed natural gas and air in the connecting pipe 102 can be further mixed while maintaining a relatively fast flow rate, preventing the first sub-chamber 1031 from being Inadequate mixing of natural gas and air.

Corresponding to the nozzle 104, different types of throat pipes 106 can be replaced, installed and used according to the conditions of different wells, and the installation and disassembly are convenient.

Meanwhile, in the natural gas combustion combustion-supporting device of the embodiment of the present invention, the diameter of the throat pipe 106 may also be 1-10 mm.

In another possible implementation, the diffusion chamber may be a truncated conical cavity directly formed in the exhaust pipe 103. As shown in FIG. The flow rate of the mixed gas of natural gas and air into the diffusion chamber is gradually reduced to ensure that the natural gas and air can be fully mixed.

With such a setting, multiple exhaust pipes 103 need to be manufactured according to the requirements of different well pressures. When in use, the operator can select an exhaust pipe 103 with a suitable size for the diffusion chamber according to the measured well pressure.

In the natural gas burning combustion-supporting device of the embodiment of the present invention, for the igniter 2, the igniter 2 plays a role of igniting the mixed gas of natural gas and air.

Specifically, the igniter 2 includes: an ignition head 201 and a lead wire 202. The ignition head 201 is arranged at the gas outlet of the exhaust pipe 103, and the lead wire 202 is connected with the ignition head 201, as shown in FIG. The fuse 202 is ignited to ignite the ignition head 201, which improves the safety of operation.

On this basis, in order to better realize the full combustion of the mixture of natural gas and air, the combustion-supporting device can also include: a burner 3, which is arranged on the exhaust pipe 103 and covers the upper part of the diffusion chamber, such as Figure 1 shows.

By arranging the burner 3, it can not only ensure better mixing of natural gas and air for combustion, but also minimize the resistance of the gas flow of the mixed gas of natural gas and air discharged from the diffusion chamber.

Further, since the natural gas burning combustion-supporting device of the embodiment of the present invention generally needs to be used outdoors, in order to facilitate outdoor use, the combustion-supporting device also includes: a windshield 4, and the windshield 4 is sleeved on the outside of the exhaust pipe 103 , the windshield 4 is provided with ventilation holes 401, as shown in FIG. 1 .

Such setting can play a role of wind protection, so as to protect the mixture of natural gas and air from being difficult to extinguish when burning, and the burned gas can be discharged into the atmosphere through the ventilation hole 401 .

It should be noted that, during actual assembly, the lead wire 202 needs to pass through the ventilation hole 401 and be suspended outside the combustion-supporting device.

In terms of connection, in order to facilitate the installation and disassembly of the components of the combustion-supporting device, the components can be connected by thread structure.

For example, the mouth of the inlet pipe 101 and the oil pipe can be connected by threads, the inlet pipe 101 and the connecting pipe 102 can be connected by threads, the connecting pipe 102 and the exhaust pipe 103 can be connected by threads, and the windshield 4 and the exhaust pipe 103 can be connected by thread, between the connecting sleeve 105 and the intake pipe 101 can be connected by thread, between the nozzle 104 and the connecting sleeve 105 can be connected by thread, between the throat pipe 106 and the exhaust pipe 103 Can be threaded.

In the actual use process, the operator can carry the natural gas combustion and combustion-supporting device of the embodiment of the present invention to the nozzle of the oil pipe where the oil-associated natural gas to be processed is located, connect the intake pipe 101 with the nozzle of the oil pipe, and then open the oil pipe. The valve at the port, and then ignite the lead wire 202, so that the oil-associated natural gas can be fully burned after being mixed with air.

The above description is only for those skilled in the art to understand the technical solution of the present invention, and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. a kind of combustion of natural gas auxiliary combustion equipment, which is characterized in that the auxiliary combustion equipment includes: ejection assemblies (1) and igniter (2), wherein

The ejection assemblies (1) include sequentially connected air inlet pipe (101), connecting tube (102) and exhaust pipe (103), it is described into It is provided with the contraction chamber reduced towards the connecting tube (102) in tracheae (101), is provided in the exhaust pipe (103) separate The widened diffusion chamber of the connecting tube (102), the contraction chamber are connected to the diffusion chamber by the connecting tube (102)；

The suction hole (1021) for being in communication with the outside is also provided on the connecting tube (102)；

The igniter (2) is arranged at the gas outlet of the exhaust pipe (103).

2. combustion of natural gas auxiliary combustion equipment according to claim 1, which is characterized in that the ejection assemblies (1) further include: Nozzle (104), nozzle (104) setting is in the air inlet pipe (101)；

The lumen of the air inlet pipe (101) is connected to the inner hole of the nozzle (104), forms the contraction chamber.

3. combustion of natural gas auxiliary combustion equipment according to claim 2, which is characterized in that the ejection assemblies (1) further include: Connector sleeve (105), the connector sleeve (105) are arranged in the junction of the air inlet pipe (101) and the connecting tube (102), institute It states and is offered on connector sleeve (105) mounting hole (1051), nozzle (104) setting is in the mounting hole (1051).

4. combustion of natural gas auxiliary combustion equipment according to claim 1, which is characterized in that the contraction chamber is to be formed directly into Truncated cone-shaped cavity in the air inlet pipe (101).

5. combustion of natural gas auxiliary combustion equipment according to claim 1, which is characterized in that the diffusion chamber includes being interconnected First point of chamber (1031) and second point of chamber (1032), the internal diameter of second point of chamber (1032) is greater than first point of chamber (1031) internal diameter.

6. combustion of natural gas auxiliary combustion equipment according to claim 5, which is characterized in that the ejection assemblies (1) further include: Trunnion (106), the trunnion (106) are arranged in first point of chamber (1031).

7. combustion of natural gas auxiliary combustion equipment according to claim 1, which is characterized in that the diffusion chamber is to be formed directly into Truncated cone-shaped cavity in the exhaust pipe (103).

8. combustion of natural gas auxiliary combustion equipment according to claim 1, which is characterized in that the igniter (2) includes: igniting Head (201) and lead (202), the igniter head (201) are arranged at the gas outlet of the exhaust pipe (103), the lead (202) it is connected with described igniter head (201).

9. combustion of natural gas auxiliary combustion equipment according to claim 1, which is characterized in that the auxiliary combustion equipment further include: furnace Head (3), the burner (3) is arranged on the exhaust pipe (103), and is covered on the top of the diffusion chamber.

10. combustion of natural gas auxiliary combustion equipment according to claim 1, which is characterized in that the auxiliary combustion equipment further include: anti- Fan housing (4), the hurricane globe (4) are set in the outside of the exhaust pipe (103), offer ventilation hole on the hurricane globe (4) (401)。