CN215892355U - Combustion system - Google Patents
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- CN215892355U CN215892355U CN202121550664.7U CN202121550664U CN215892355U CN 215892355 U CN215892355 U CN 215892355U CN 202121550664 U CN202121550664 U CN 202121550664U CN 215892355 U CN215892355 U CN 215892355U
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Abstract
The utility model discloses a combustion system, which comprises a combustion chamber and a main burner arranged on the side wall of the combustion chamber, wherein the main burner is provided with a spraying channel, a gas inlet and an air inlet which are respectively communicated with the front end part of the spraying channel; wherein a noble metal catalyst honeycomb device is installed in a rear end portion of the ejection passage, and an oxide catalyst is provided in a circumferential direction of the rear end portion of the noble metal catalyst honeycomb device. The utility model adopts the form of combining the noble metal catalyst and the oxide catalyst to catalyze the combustion reaction, has low ignition temperature and is environment-friendly.
Description
Technical Field
The present invention relates to a combustion system.
Background
Energy is the strategic focus of economic and social development in China, and with rapid development of world economy and industrial production and rapid growth of population, the global ecological environment is increasingly worsened. The environmental protection, the environmental pollution reduction, the energy saving and the reasonable utilization of natural resources have become new international focuses. China has a large population, and the chemical energy resources of the human population are very limited.
At present, people mainly use natural gas, liquefied petroleum gas, coal gas and other fuel gases. The main fuel gas energy of many cities and industries in China is coal gas, and compared with natural gas, the coal gas has low heat value, low ignition energy, and more harmful impurities such as S and tar. The liquefied petroleum gas has the similar properties with natural gas, and the Burma liquefied petroleum gas resource mainly comprises two types of oilfield associated gas and petroleum refining gas. In the research on catalytic combustion of natural gas, fossil oil gas, coal gas, and the like, catalytic combustion of natural gas has been mainly focused on because, on the one hand, the reserves of natural gas are enormous, and, on the other hand, CH, which is the most stable carbon compound as a main component in natural gas, and C — H bond is difficult to activate.
The combustion used by human beings at present is mainly flame combustion, which plays a very important role in the evolution of human beings and the development process of human civilization. Scientific research shows that flame combustion is essentially an oxidation reaction of combustion substances (coal, oil substances, combustible gas and the like) under the participation of free radicals, the reaction mechanism of the flame combustion relates to the gas-phase initiation of the free radicals (particularly oxygen free radicals), partial electronic excited-state products are generated in the combustion process, energy is released in the form of visible light, and the partial energy flame combustion method also has a serious defect, and in the combustion process, the temperature in a combustion zone is as high as more than 1500 ℃, so that N in the air is caused2And O2Is reacted to form NOxAnd is discharged into the atmosphere, thus not only seriously polluting the environment, but also greatly reducing the energy efficiency due to incomplete combustion. The traditional flame combustion method has low heat efficiency and serious pollution, and restricts the development of economy in China.
The heat accumulating type catalytic combustion device has high utilization efficiency of catalytic combustion waste heat, is an internationally recognized energy-saving organic waste gas treatment device, and has the working principle that the activation energy of vocs gas is reduced by utilizing a catalyst, the decomposition temperature of the vocs gas is reduced to 200-400 ℃, meanwhile, because the catalyst is generally a porous material, the strong surface adsorption capacity of the catalyst enriches reactant molecules on the surface of the catalyst, and the concentration of the reactant molecules is improved through phase change, so that the reaction rate is improved, and the reaction speed is acceleratedThe reaction is carried out, so that the vocs gas and oxygen molecules are subjected to flameless combustion under the condition of low ignition temperature, and are subjected to oxidative decomposition to form C02And H20 and a large amount of heat is released. Oxidatively decomposed C02And H20 and unreacted air are used for storing heat generated in the catalytic combustion process through the heat storage material, and then other materials are used for absorbing the heat absorbed by the heat storage material.
Due to the high calorific value of natural gas (Δ H = -803 kJ/mol), the combustion chamber temperature can be as high as 1800 ℃ C, resulting in N in air2High-temperature oxidation inevitably occurs, and NOx is generated to cause environmental pollution. The catalytic combustion is adopted to replace the traditional flame combustion, on one hand, the temperature of the combustion chamber can be reduced to be below 500 ℃, and thus NO can be effectively inhibitedx(ii) formation of (a); on the other hand, the high air-fuel ratio stable combustion can be carried out, and the utilization rate of the fuel gas is improved. The catalyst promotes flameless combustion, the generated heat flow temperature is moderate, and the gas turbine can be directly driven without air for dilution and cooling, thereby improving the heat efficiency.
Catalysts used for catalytic combustion of natural gas can be classified into noble metal catalysts and oxide type catalysts. The noble metal catalyst has high activity and low ignition temperature, but because the noble metal resource is limited, the noble metal catalyst can be sintered and lost due to evaporation at high temperature, so that the catalytic activity is reduced. The noble metal catalysts reported in the literature at present cannot therefore be used directly for high-temperature catalytic combustion. Oxide-type catalysts are gaining attention because of their excellent thermal stability. However, the activity of oxide catalysts is generally low, and it is difficult to meet the requirement of low ignition temperature of the burner.
The key to the performance of the natural gas high-temperature catalytic combustor is the light-off and high-temperature characteristics of the used catalyst, and the following requirements are usually met:
the oil/gas mixture can be ignited at as low a temperature as possible;
secondly, the catalyst has larger thermal stability with high specific surface area;
thirdly, the catalyst is not sensitive to thermal shock;
fourthly, the pressure difference between the two ends of the catalyst bed layer is as low as possible;
the operation is carried out for a long time under the high temperature condition of more than 1300 ℃, and the activity of the catalyst can still be maintained.
However, the catalyst systems developed at present have difficulty in satisfying the above requirements at the same time.
Disclosure of Invention
The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide a combustion system which adopts a form of combining a noble metal catalyst and an oxide catalyst to catalyze combustion reaction, has low ignition temperature and is environment-friendly.
In order to solve the technical problems, the technical scheme of the utility model is as follows: a combustion system comprises a combustion chamber and a main burner arranged on the side wall of the combustion chamber, wherein the main burner is provided with a spraying channel, a gas inlet and an air inlet which are respectively communicated with the front end part of the spraying channel; wherein the content of the first and second substances,
a noble metal catalyst honeycomb device is installed in a rear end portion of the ejection passage, and an oxide catalyst is provided in a circumferential direction of the rear end portion of the noble metal catalyst honeycomb device.
And further, in order to fully mix the fuel gas and the air, the energy-saving combustion method also comprises two auxiliary burners which are respectively arranged on the side wall of the combustion chamber and are symmetrically arranged relative to the main burner, and the two auxiliary burners flow to the combustion chamber to spray the fuel gas.
Furthermore, the energy-saving combustion method also comprises an air blower, an induced draft fan, a four-way reversing valve and two regenerators which are respectively communicated with the combustion chambers; wherein the content of the first and second substances,
the two regenerators are respectively connected with the four-way reversing valve through pipelines, the draught fan is connected with the four-way reversing valve through a smoke exhaust pipe, and the air blower is connected with the four-way reversing valve through an air inlet pipe.
Furthermore, the four-way reversing valve is provided with a first port, a second port, a third port and a fourth port, one heat storage chamber is communicated with the first port through a pipeline, the other heat storage chamber is communicated with the second port through a pipeline, the air blower is communicated with the third port through an air inlet pipe, and the induced draft fan is communicated with the fourth port through a smoke exhaust pipe; wherein the content of the first and second substances,
the four-way reversing valve has a first state and a second state; when the four-way reversing valve is in a first state, the first port is communicated with the fourth port, and the second port is communicated with the third port; when the four-way reversing valve is in the second state, the first port is communicated with the third port, and the second port is communicated with the fourth port.
Furthermore, the heat accumulator in the heat accumulation chamber is made of high-alumina refractory material.
Further, the impeller of the induced draft fan is made of stainless steel.
After the technical scheme is adopted, in the operation process, the fuel gas/air mixture firstly passes through the noble metal catalyst to ignite oxidation reaction, and then is further combusted on the surface of the oxide type catalyst with high activity, large surface area and good thermal stability, so that the fuel gas/air mixture reaches the enough temperature; and finally, complete combustion of the fuel gas is completed, the noble metal catalyst is used in the ignition stage of catalytic combustion, the oxide catalyst is used in the aspect of catalyzing further combustion, due to the fact that the activity of the noble metal catalyst is high, compared with the independent oxide catalyst, the ignition temperature is greatly reduced, the fuel gas is subjected to flameless combustion at the lower ignition temperature of 250-350 ℃, organic substances are oxidized on the surface of the oxide catalyst, and CO is generated at the same time2And H2O, and a large amount of heat is released, and the oxidation reaction temperature is low, so that the formation of high-temperature NOX by N2 in the air is greatly inhibited, and the method is one of effective means for purifying organic waste gas such as hydrocarbon and eliminating stink; the utility model can make the combustion efficiency reach more than 99.5 percent, simultaneously the NO emission is less than 0.0003 percent (volume fraction), the thermal efficiency can be obviously improved, even the amplification can reach more than 10 percent, and meanwhile, the utility model hardly has the emission of HC, CO and NO. Has obvious energy-saving and environmental protection benefits.
Drawings
FIG. 1 is a schematic structural view of a combustion system of the present invention;
fig. 2 is an enlarged view of a portion a of fig. 1.
Detailed Description
In order that the present invention may be more readily and clearly understood, a more particular description of the utility model briefly described above will be rendered by reference to specific embodiments that are illustrated in the appended drawings.
As shown in fig. 1 and 2, a combustion system comprises a combustion chamber 1 and a main burner 2 mounted on the side wall of the combustion chamber 1, wherein the main burner 2 is provided with a jetting channel 21, and a gas inlet 22 and an air inlet 23 which are respectively communicated with the front end of the jetting channel 21; wherein the content of the first and second substances,
a noble metal catalyst honeycomb device 24 is installed in the rear end portion of the discharge passage 21, and an oxide catalyst 25 is provided in the circumferential direction of the rear end portion of the noble metal catalyst honeycomb device 24.
Specifically, in the operation process, the fuel gas/air mixture firstly passes through a noble metal catalyst to ignite oxidation reaction, and then is further combusted on the surface of an oxide type catalyst 25 with high activity, large surface area and good thermal stability, so that the fuel gas/air mixture reaches a sufficient temperature; and finally, complete combustion of the fuel gas is completed, the noble metal catalyst is used in the ignition stage of catalytic combustion, the oxide catalyst 25 is used in the aspect of catalyzing further combustion, due to the fact that the activity of the noble metal catalyst is high, compared with the independent oxide catalyst, the ignition temperature is greatly reduced, the fuel gas is subjected to flameless combustion at the low ignition temperature of 250-350 ℃, organic substances are oxidized on the surface of the oxide catalyst, and CO is generated at the same time2And H2O and release a large amount of heat, and the N in the air is greatly inhibited due to the low oxidation reaction temperature2NO forming high temperatureXIs one of effective means for purifying organic waste gas such as hydrocarbon and eliminating foul smell; the utility model can make the combustion efficiency reach more than 99.5 percent, simultaneously the NO emission is less than 0.0003 percent (volume fraction), the thermal efficiency can be obviously improved, even the amplification can reach more than 10 percent, and meanwhile, the utility model hardly has the emission of HC, CO and NO. Has obvious energy-saving and environmental protection benefits.
In this embodiment, in order to fully mix the gas and the air, the combustion system further includes two auxiliary burners respectively installed on the side wall of the combustion chamber 1 and symmetrically arranged with respect to the main burner 2, and the two auxiliary burners inject the gas into the combustion chamber 1 in a flowing manner.
In this embodiment, the fuel gas is natural gas.
As shown in fig. 1, the combustion system further comprises a blower 3, an induced draft fan 4, a four-way reversing valve 5 and two regenerators 6 which are respectively communicated with the combustion chamber 1; wherein the content of the first and second substances,
two regenerators 6 link to each other with four-way reversing valve 5 through the pipeline respectively, draught fan 4 is through discharging fume union coupling four-way reversing valve 5, air-blower 3 is through intake-tube connection four-way reversing valve 5.
In the present embodiment, the heat storage body 6 is selected by the following principle: the heat accumulator 7 in the heat accumulation chamber 6 is made of high-alumina refractory material.
Because the combustion tail gas of the natural gas contains a large amount of water vapor, in order to play a role of corrosion prevention, the impeller of the induced draft fan 4 is made of stainless steel. The blower 3 is made of low alloy materials and is subjected to anticorrosive treatment.
Specifically, the regenerator 6 absorbs heat during smoke exhaust and releases heat during air intake, thereby greatly improving the utilization rate of heat energy.
As shown in fig. 1, the four-way reversing valve 5 has a first port, a second port, a third port and a fourth port, one regenerator 6 is communicated with the first port through a pipeline, the other regenerator 6 is communicated with the second port through a pipeline, the blower 3 is communicated with the third port through an air inlet pipe, and the induced draft fan 4 is communicated with the fourth port through a smoke exhaust pipe; wherein the content of the first and second substances,
the four-way reversing valve 5 has a first state and a second state; when the four-way reversing valve 5 is in the first state, the first port is communicated with the fourth port, and the second port is communicated with the third port; when the four-way reversing valve 5 is in the second state, the first port is communicated with the third port, and the second port is communicated with the fourth port.
The above embodiments are described in further detail to solve the technical problems, technical solutions and advantages of the present invention, and it should be understood that the above embodiments are only examples of the present invention and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A combustion system, characterized in that,
the burner comprises a combustion chamber (1) and a main burner (2) arranged on the side wall of the combustion chamber (1), wherein the main burner (2) is provided with a spraying channel (21), and a gas inlet (22) and an air inlet (23) which are respectively communicated with the front end part of the spraying channel (21); wherein the content of the first and second substances,
a noble metal catalyst honeycomb device (24) is mounted in the rear end portion of the discharge passage (21), and an oxide catalyst (25) is provided in the circumferential direction of the rear end portion of the noble metal catalyst honeycomb device (24).
2. The combustion system of claim 1,
the burner is characterized by further comprising two auxiliary burners which are respectively installed on the side wall of the combustion chamber (1) and symmetrically arranged relative to the main burner (2), and gas is sprayed into the combustion chamber (1) through the two auxiliary burners in a flowing mode.
3. The combustion system of claim 1,
the heat-accumulating type combustor is characterized by also comprising an air blower (3), an induced draft fan (4), a four-way reversing valve (5) and two heat accumulating chambers (6) which are respectively communicated with the combustion chamber (1); wherein the content of the first and second substances,
two regenerators (6) link to each other with four-way reversing valve (5) through the pipeline respectively, draught fan (4) are through discharging fume union coupling four-way reversing valve (5), air-blower (3) are through intake-tube connection four-way reversing valve (5).
4. The combustion system of claim 3,
the four-way reversing valve (5) is provided with a first port, a second port, a third port and a fourth port, one heat storage chamber (6) is communicated with the first port through a pipeline, the other heat storage chamber (6) is communicated with the second port through a pipeline, the air blower (3) is communicated with the third port through an air inlet pipe, and the induced draft fan (4) is communicated with the fourth port through a smoke exhaust pipe; wherein the content of the first and second substances,
the four-way reversing valve (5) has a first state and a second state; when the four-way reversing valve (5) is in a first state, the first port is communicated with the fourth port, and the second port is communicated with the third port; when the four-way reversing valve (5) is in the second state, the first port is communicated with the third port, and the second port is communicated with the fourth port.
5. The combustion system of claim 3,
the heat accumulator (7) in the heat accumulation chamber (6) is made of high-alumina refractory material.
6. The combustion system of claim 3,
and the impeller of the induced draft fan (4) is made of stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121550664.7U CN215892355U (en) | 2021-07-08 | 2021-07-08 | Combustion system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121550664.7U CN215892355U (en) | 2021-07-08 | 2021-07-08 | Combustion system |
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| Publication Number | Publication Date |
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| CN215892355U true CN215892355U (en) | 2022-02-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121550664.7U Active CN215892355U (en) | 2021-07-08 | 2021-07-08 | Combustion system |
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| CN (1) | CN215892355U (en) |
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- 2021-07-08 CN CN202121550664.7U patent/CN215892355U/en active Active
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| TR01 | Transfer of patent right |
Effective date of registration: 20230609 Address after: No. 588, Songhua River Road, Bowang District, Maanshan, Anhui 243131 Patentee after: Shunbo Alloy Anhui Co.,Ltd. Address before: No. 588, Hongsheng Road, Kunlun Street, Liyang City, Changzhou City, Jiangsu Province 213300 Patentee before: SHUNBO ALLOY JIANGSU Co.,Ltd. |
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| TR01 | Transfer of patent right |