A flare gas combustion system

Abstract

The present invention discloses a flare gas combustion system, comprising: at least one mixing chamber: used for temporarily storing the flare gas and mixed oxygen extracted from the flare pipeline; an oxygenator: used for introducing oxygen into the mixing chamber, so that the oxygen ratio in the mixing chamber is consistent with the oxygen content ratio under atmospheric conditions; a combustion device: the mixed gas in the mixing chamber is introduced into the combustion device for combustion. The present invention temporarily stores the flare gas extracted from the flare pipeline by setting a mixing chamber, which is beneficial for cyclical periodic combustion of the flare gas; by setting oxygen supplementation, the oxygen ratio in the mixing chamber is consistent with the oxygen content ratio under atmospheric conditions, completely simulating the combustion of the flare gas under atmospheric conditions; and obtaining the combustion result of the flare gas under atmospheric conditions.

Description

Technical Field

[0001] The invention belongs to the field of flare gas greenhouse gas emission monitoring and relates to a flare gas combustion device. Background Art

[0002] At present, the mainstream method of carbon emission accounting adopts the principle of conservation of mass for calculation. However, due to the use of statistical principles, the carbon emissions calculated by each enterprise are greatly different from the actual carbon dioxide emissions of the enterprise due to differences in the statistical caliber of enterprise data, test conditions, test capabilities, fuel variety, etc. It is of great significance to use real-time online monitoring of greenhouse gas emissions such as carbon dioxide for carbon emission accounting.

[0003] At present, the real-time online monitoring methods of greenhouse gases such as carbon dioxide emitted from fixed pollution sources are only applicable to situations where there is a certain distance between the production point and the emission point of greenhouse gases such as carbon dioxide. The equipment is installed in the path where greenhouse gases such as carbon dioxide have been formed and are emitted into the atmosphere. A certain amount of samples are extracted through the probe sampling system. After the samples are pre-processed by the pre-processing system, they enter the analysis system to measure greenhouse gases such as carbon dioxide, and then the carbon dioxide emissions are calculated by the data processing system.

[0004] In the process of implementing the present invention, the inventors found that the prior art has at least one of the following technical problems:

[0005] 1. For flare systems in the petroleum, chemical and other industries, the existing online monitoring technology cannot be applied in this field because the combustion point and the emission point are located at the same position.

[0006] 2. The applicant thought of extracting part of the flare gas for controlled combustion to achieve online real-time monitoring, but the flare gas has a long carbon chain and is prone to incomplete combustion. If the flare gas is not burned completely, the results of online greenhouse gas detection will be inaccurate.

[0007] 3. The emission of flare gas has the characteristics of continuous emission, sudden occurrence, and uncertainty of source. The existing technology still lacks a device that can realize standardized combustion of flare gas. Summary of the invention

[0008] In view of this, an object of the present invention is to provide a system capable of ensuring sufficient combustion of flare gas, wherein the flare gas combustion products processed by the system are conducive to accurate detection of greenhouse gas content.

[0009] The inventor has continuously innovated and reformed through long-term exploration and attempts, as well as multiple experiments and efforts. To solve the above technical problems, the technical solution provided by the present invention is to provide a flare gas combustion system, including:

[0010] At least one mixing chamber: used for temporarily storing the flare gas and mixed oxygen extracted from the flare pipeline;

[0011] Oxygenator: used to introduce oxygen into the mixing chamber so that the oxygen content in the mixing chamber is consistent with the oxygen content in atmospheric conditions;

[0012] Combustion device: The mixed gas in the mixing chamber is passed into the combustion device for combustion.

[0013] According to one embodiment of the flare gas combustion system of the present invention, the mixing chamber is connected to the flare gas inlet pipe equipped with a valve, the mixing chamber is connected to the oxygenator via a pipeline equipped with a valve; the mixing chamber is connected to the combustion device via a pipeline equipped with a valve and a flame retardant; the combustion device is connected to the combustion gas outlet pipe equipped with a valve.

[0014] According to an embodiment of the flare gas combustion system of the present invention, the oxygenator is connected to the first blower via a pipeline.

[0015] According to one embodiment of the flare gas combustion system of the present invention, a second fan is installed on the pipeline between the combustion device and the combustion gas outlet pipe.

[0016] According to an embodiment of the flare gas combustion system of the present invention, the amount of the flare gas material in the mixing chamber is not greater than the maximum safe amount of the combustion device.

[0017] According to an embodiment of the flare gas combustion system of the present invention, there are two mixing chambers, which are connected in parallel between the flare gas inlet pipe and the combustion device through a pipeline.

[0018] According to an embodiment of the flare gas combustion system of the present invention, the mixing chamber and the combustion device are arranged in a closed circulation pipeline formed by pipelines.

[0019] According to one embodiment of the flare gas combustion system of the present invention, the mixing chamber includes a first mixing chamber and a second mixing chamber, the air inlet of the first mixing chamber is connected to the first front branch pipe, the first front branch pipe is equipped with a first valve, the air inlet of the second mixing chamber is connected to the second front branch pipe, the second front branch pipe is equipped with an eighth valve, the first front branch pipe and the second front branch pipe are connected to the flare gas pipe; the air outlet of the first mixing chamber is connected to the first rear branch pipe, the first rear branch pipe is equipped with a second valve, the air outlet of the second mixing chamber is connected to the second rear branch pipe, the second rear branch pipe is equipped with a ninth valve, the first rear branch pipe and the second rear branch pipe are connected to the air inlet pipe of the combustion device; the combustion device is connected to the combustion device through the air inlet ... The fourth valve, the second fan and the first flame retardant are installed in sequence on the air inlet pipe of the device; the front of the fourth valve of the air inlet pipe of the combustion device is connected to the oxygen supply pipe, the oxygen supply pipe is connected to the oxygenator, and the third valve is installed on the oxygen supply pipe; the fourth valve of the air inlet pipe of the combustion device is connected to the combustion air outlet pipe before the second fan, and the fifth valve is installed on the combustion air outlet pipe; the combustion device is also connected to a circulation pipe, the circulation pipe is installed with the second flame retardant, and is connected to the sixth valve through a branch pipe, the circulation pipe is connected to the first return branch and the second return branch, the first return branch is connected to the first mixing chamber, the second return branch is connected to the second mixing chamber, the first return branch is installed with the seventh valve, and the second return branch is installed with the tenth valve.

[0020] According to an embodiment of the flare gas combustion system of the present invention, the valve is a solenoid valve.

[0021] Compared with the prior art, one of the above technical solutions has the following advantages:

[0022] a) The present invention provides a mixing chamber to temporarily store the flare gas extracted from the flare pipeline, which is beneficial for cyclical combustion of the flare gas; by providing oxygen supplementation, the oxygen content in the mixing chamber is consistent with the oxygen content ratio under atmospheric conditions, completely simulating the combustion of the flare gas under atmospheric conditions; and obtaining the combustion result of the flare gas under atmospheric conditions.

[0023] b) In one embodiment of the present invention, the amount of flare gas in the mixing chamber is not greater than the maximum safe amount of the combustion device, which can ensure that the combustion device performs combustion processing under safe conditions and avoid explosion of the combustion device.

[0024] c) In one embodiment of the present invention, by setting up a circulation pipeline, it is helpful to verify whether the flare gas is fully burned, and it is helpful to obtain more accurate results of online greenhouse gas detection.

[0025] d) The flare gas combustion system of the present invention can ensure that the flare gas is fully burned under controllable conditions, can cope with the characteristics of emission continuity, sudden occurrence, uncertainty of source, etc., and is conducive to obtaining more accurate results of online greenhouse gas detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is a schematic block diagram of the pipeline structure of a preferred embodiment of the flare gas combustion system of the present invention.

[0028] The marks in the figure are:

[0029] 110 First mixing chamber,

[0030] 111 First Valve,

[0031] 112 Second valve,

[0032] 113 Seventh Valve,

[0033] 120 Second mixing chamber,

[0034] 121 The eighth valve,

[0035] 122 Ninth Valve,

[0036] 123 The tenth valve,

[0037] 130 oxygenator,

[0038] 131 The third valve,

[0039] 132 First fan,

[0040] 140 Combustion Devices,

[0041] 141 First Flame Retardant,

[0042] 1411 Second fan,

[0043] 142 Second flame retardant,

[0044] 1421 Sixth Valve,

[0045] 150 Fourth valve,

[0046] 160 Fifth Valve,

[0047] IN inlet gas pipe,

[0048] OUT Combustion gas outlet. DETAILED DESCRIPTION

[0049] The following is a description with reference to the accompanying drawings and a specific embodiment.

[0050] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention.

[0051] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and thus, once an item is defined in one drawing, it may not be further defined or explained in the subsequent drawings.

[0052] Example 1

[0053] See also Figure 1 The flare gas combustion system described in this embodiment is used to fully burn the flare gas so as to measure the emission of greenhouse gases such as CO2 from the flare system.

[0054] The two mixing chambers, the first mixing chamber 110 and the second mixing chamber 120, have a temporary storage time of one pumping cycle, which is also approximately one round of flare gas full combustion cycle. The duration of one round of flare gas full combustion cycle is no longer than one pumping cycle. The first mixing chamber 110 and the second mixing chamber 120 are used alternately in cycles. In one pumping cycle, the first mixing chamber 110 is used to temporarily store the flare gas and mixed oxygen extracted from the flare pipeline; the second mixing chamber 120 is used to mix the combustion gas that is not fully burned (for example, the combustion gas after the first combustion) and the combustion gas that is fully burned (the combustion gas after the last combustion) with oxygen. The amount of flare gas material in the mixing chamber is no more than the maximum safe amount of the combustion device 140. The first mixing chamber 110 and the second mixing chamber 120 are both provided with oxygen concentration detection sensors, which can detect the oxygen concentration in the first mixing chamber 110 and the second mixing chamber 120 in real time, and ensure that the final oxygen concentration of the mixed gas is equivalent to the oxygen concentration in the atmosphere.

[0055] Oxygenator 130: used to introduce oxygen into the mixing chamber, and mix it with the flare gas to be burned, or the flare gas that has not been fully burned, or the flare gas that has been fully burned, so that the proportion of oxygen in the mixing chamber is consistent with the proportion of oxygen content under atmospheric conditions; the amount of oxygen is set to 21% of the oxygen content of the atmospheric environment air. The oxygenator 130 is connected to the first fan 132 through a pipeline. The first fan 132 can be installed at the front end of the pipeline of the oxygenator 130, and can also be installed at the rear end of the pipeline of the oxygenator 130.

[0056] Combustion device 140: The mixed gas in the mixing chamber is passed into the combustion device 140 for combustion. The mixed gas includes a mixture of flare gas and oxygen to be burned, a mixture of flare gas and oxygen that has not been fully burned, and a mixture of flare gas and oxygen that has been fully burned. The mixture of flare gas and oxygen that has been fully burned enters the combustion device 140 for combustion. The difference in oxygen content before and after combustion indicates that the flare gas has been fully burned. The present invention simulates the combustion of flare gas in the atmosphere as much as possible. The inventor sets the proportion of oxygen in the mixed gas to 21%. Usually, after the flare gas is burned once, it may not be fully burned and needs to be burned again. Therefore, it is necessary to circulate the gas between the combustion device and the mixing chamber. The combustion device 140 has a closed combustion chamber, which can be a constant volume combustion bomb or a similar device.

[0057] Figure 1 In the figure, IN indicates the gas inlet pipe for the flare, and OUT indicates the gas outlet pipe for the combustion after full combustion. The combustion gas after full combustion is used for the detection of greenhouse gases such as CO2. The mixing chamber is connected to the gas inlet pipe IN with a valve installed. The mixing chamber is connected to the oxygenator 130 through a pipeline with a valve installed. The mixing chamber is connected to the combustion device 140 through a pipeline with a valve and a flame retardant installed. The combustion device 140 is connected to the gas outlet pipe OUT with a valve installed. A second fan 142 is installed on the pipeline between the combustion device 140 and the gas outlet pipe OUT.

[0058] In this embodiment, the two mixing chambers are connected in parallel between the flare gas inlet pipe IN and the combustion device 140 through pipelines, and are in a closed circulation pipeline formed by the pipelines.

[0059] Specifically, the mixing chamber includes a first mixing chamber 110 and a second mixing chamber 120, the air inlet of the first mixing chamber 110 is connected to the first front branch pipe, the first front branch pipe is equipped with a first valve 111, the air inlet of the second mixing chamber 120 is connected to the second front branch pipe, the second front branch pipe is equipped with an eighth valve 121, the first front branch pipe and the second front branch pipe are connected to the flare gas pipe IN; the air outlet of the first mixing chamber 110 is connected to the first rear branch pipe, the first rear branch pipe is equipped with a second valve 112, the air outlet of the second mixing chamber 120 is connected to the second rear branch pipe, the second rear branch pipe is equipped with a ninth valve 122, the first rear branch pipe and the second rear branch pipe are connected to the air inlet pipe of the combustion device 140; the fourth valve 150 is sequentially installed on the air inlet pipe of the combustion device 140 , the second fan 142 and the first flame retardant 141; the fourth valve 150 of the air inlet pipe of the combustion device 140 is connected to the oxygen supply pipe in front, the oxygen supply pipe is connected to the oxygen supply machine, and the third valve 131 is installed on the oxygen supply pipe; the fourth valve 150 of the air inlet pipe of the combustion device 140 is connected to the combustion air pipe OUT before the second fan 142, and the fifth valve 160 is installed on the combustion air pipe OUT; the combustion device 140 is also connected to a circulation pipe, the circulation pipe is installed with the second flame retardant 142, and is connected to the sixth valve 1421 through a branch pipe, the circulation pipe is connected to the first return branch and the second return branch, the first return branch is connected to the first mixing chamber 110, the second return branch is connected to the second mixing chamber 120, the first return branch is installed with the seventh valve 113, and the second return branch is installed with the tenth valve 123. The sixth valve 1421 is a pressure relief valve.

[0060] In this embodiment, the valve is a solenoid valve, which is connected to a controller to flexibly control the opening and closing of the valve. All valves are in a normally closed state.

[0061] The first mixing chamber 110 begins to store the flare gas, and the other valves are all in a closed state.

[0062] The flare gas storage volume in the first mixing chamber 110 reaches the maximum value, i.e., the maximum safe volume of the combustion device 140, the first valve 111 is closed, the eighth valve 121 is opened, and the second mixing chamber 120 begins to store flare gas. The second valve 112, the third valve 131, and the eighth valve 121 are opened, the oxygenator 130 and the first blower 132 are started, and oxygen is added to the first mixing chamber 110 until the oxygen content in the first mixing chamber 110 reaches 21%.

[0063] Close the third valve 131, open the fourth valve 150, start the second fan 1411, and wait for the combustion mixture to enter the combustion device 140. Close the fourth valve 150, ignite, and burn. After the combustion is completed, open the seventh valve 113, and the burned gas enters the first mixing chamber 110. Open the second valve 112 and the third valve 131, start the oxygenator 130 and the first fan 132, and start adding oxygen to the first mixing chamber 110 until the oxygen content in the first mixing chamber 110 reaches 21%. This step is repeated until the oxygen content of the mixed gas remains unchanged before and after combustion, indicating that the flare gas has achieved complete and sufficient combustion. The fully burned mixed gas is discharged from the combustion gas outlet pipe OUT and is used to measure the content of greenhouse gases such as CO2. The burned gas in the pipeline system can also be depressurized through the sixth valve 1421.

[0064] The flare gas storage volume in the second mixing chamber 120 reaches the maximum value, that is, reaches the maximum safety volume of the combustion device 140, and begins to enter the cycle combustion program. The first mixing chamber 110 re-enters the flare gas storage program.

[0065] From the first combustion of the mixed gas to the complete combustion, it is a combustion cycle. The first mixing chamber 110 starts to store the flare gas until it reaches the maximum safe amount of the combustion device 140, which is a gas storage cycle. When the mixing chamber is set to two, the gas storage cycle is not shorter than the combustion cycle.

[0066] Of course, the number of mixing chambers can also be 3, 4, or even more, which needs to be specifically set according to the composition of the flare gas.

[0067] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood 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 one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0068] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0069] The above are only preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be regarded as limiting the present invention, and the protection scope of the present invention should be based on the scope defined by the claims. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the spirit and scope of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A flare gas combustion system, characterized in that: include: Multiple mixing chambers: used to periodically temporarily store the flare gas and mixed oxygen extracted from the flare pipeline; the temporary storage time is one gas extraction cycle; Oxygenator: used to introduce oxygen into the mixing chamber so that the oxygen content in the mixing chamber is consistent with the oxygen content in atmospheric conditions; Combustion device: It has a closed combustion chamber, and the mixed gas in the mixing chamber is introduced into the combustion device for combustion; the closed combustion chamber is a constant volume combustion bomb; the full combustion cycle of a round of torch gas is no longer than one exhaust cycle; The mixing chamber is connected to the flare gas inlet pipe installed with a valve, and the mixing chamber is connected to the oxygenator through a pipeline installed with a valve; the mixing chamber is connected to the combustion device through a pipeline installed with a valve and a flame retardant; the combustion device is connected to the combustion gas outlet pipe installed with a valve; The amount of flare gas material in the mixing chamber is not greater than the maximum safe amount of the combustion device, and multiple mixing chambers are connected in parallel between the flare gas inlet pipe and the combustion device through pipelines; the mixing chamber and the combustion device are arranged in a closed circulation pipeline formed by pipelines.

2. The flare gas combustion system according to claim 1, characterized in that: The oxygenator is connected to a first fan via a pipeline.

3. The flare gas combustion system according to claim 1, characterized in that: A second fan is installed on the pipeline between the combustion device and the combustion gas outlet pipe.

4. The flare gas combustion system according to claim 1, 2 or 3, characterized in that: There are two mixing chambers.

5. The flare gas combustion system according to claim 4, characterized in that: The mixing chamber comprises a first mixing chamber and a second mixing chamber, an air inlet of the first mixing chamber is connected to a first front branch pipe, a first valve is installed on the first front branch pipe, an air inlet of the second mixing chamber is connected to a second front branch pipe, an eighth valve is installed on the second front branch pipe, the first front branch pipe and the second front branch pipe are connected to a flare gas pipe; an air outlet of the first mixing chamber is connected to a first rear branch pipe, a second valve is installed on the first rear branch pipe, an air outlet of the second mixing chamber is connected to a second rear branch pipe, a ninth valve is installed on the second rear branch pipe, the first rear branch pipe and the second rear branch pipe are connected to an air inlet pipe of a combustion device; and a plurality of valves are installed in sequence on the air inlet pipe of the combustion device. There are a fourth valve, a second fan and a first flame retardant; the front of the fourth valve of the air inlet pipe of the combustion device is connected to an oxygen supply pipe, the oxygen supply pipe is connected to the oxygen supply machine, and the third valve is installed on the oxygen supply pipe; the fourth valve of the air inlet pipe of the combustion device is connected to a combustion air pipe before the second fan, and the fifth valve is installed on the combustion air pipe; the combustion device is also connected to a circulation pipe, the circulation pipe is installed with a second flame retardant, and is connected to a sixth valve through a branch pipe, the circulation pipe is connected to a first return branch and a second return branch, the first return branch is connected to a first mixing chamber, the second return branch is connected to a second mixing chamber, the first return branch is installed with a seventh valve, and the second return branch is installed with a tenth valve.

6. The flare gas combustion system according to claim 5, characterized in that: The valve is a solenoid valve.

Images