CN210320139U - Oxygen concentration control device for thermal storage oxidation of low-concentration gas - Google Patents
Oxygen concentration control device for thermal storage oxidation of low-concentration gas Download PDFInfo
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- CN210320139U CN210320139U CN201920781843.8U CN201920781843U CN210320139U CN 210320139 U CN210320139 U CN 210320139U CN 201920781843 U CN201920781843 U CN 201920781843U CN 210320139 U CN210320139 U CN 210320139U
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Abstract
The utility model discloses an oxygen concentration control device for low concentration gas thermal storage oxidation, a serial communication port, include: the device comprises a primary mixing device, a secondary mixing device, an induced draft fan, a dust remover and a chimney, wherein the smoke inlets of the primary mixing device and the secondary mixing device are simultaneously connected with the low-temperature smoke outlet of the vertical heat-storage oxidation device and the smoke outlet of the dust remover, the mixed gas outlet of the primary mixing device is connected with the mixed gas inlet of the secondary mixing device, the high-temperature smoke outlet of the vertical heat-storage oxidation device is connected with the smoke inlet of a combustible wet material dryer, and valves, a flow measuring instrument, a gas concentration measuring instrument and an oxygen concentration measuring instrument are respectively arranged at the air inlets and the air outlets of the primary mixing device, the secondary mixing device, the induced draft fan and the vertical heat-storage oxidation. The utility model discloses rationally control oxygen concentration value and gas concentration value in the required gas of different stages, provided the operating performance and the fail safe nature of heat accumulation oxidation system and combustible wet material desiccator.
Description
Technical Field
The utility model belongs to colliery low concentration gas utilizes the field, concretely relates to oxygen concentration control device for low concentration gas thermal storage oxidation.
Background
Gas is the second only of the main greenhouse gas of carbon dioxide, and the greenhouse effect produced by unit mass of gas is equivalent to 21 times of that of the same mass of carbon dioxide. In coal mining, a large amount of gas is often associated at the same time, which is one of main gas industrial emission sources, so that the gas emission of a coal mine is reduced, and the emission of greenhouse gas can be effectively reduced. Meanwhile, the main component of coal mine gas is methane, which is a high-quality clean gas energy source.
China is a big energy consumption country, the energy yield of China in 2017 is 359000 ten thousand tons of standard coal, wherein the proportion of natural gas yield in total energy yield is continuously increased, and the natural gas yield is increased from 4.4% in 2013 to 5.4% in 2017. In recent years, the absolute quantity of extracted gas which is not utilized in China also tends to increase year by year, and the total quantity is huge. The unused pumping gas is mainly ultra-low concentration gas with concentration lower than 8%. At present, the pure methane discharged into the atmosphere through ventilation gas (ventilation air methane) in China every year is up to 100-150 hundred million Nm3The emission of methane accounts for 70 percent of the ventilation gas methane emission of coal mines in the world, which is equivalent to 1140-1700 million tons of standard coal. If the gas with different concentrations in the coal mine production process is collected and utilized, the coal mine gas accident can be effectively solved, the production living conditions of a mining area are improved, the increase of clean energy supply and the reduction of greenhouse gas emission are facilitated, and the multiple targets of life protection, resource saving and environment protection are achieved.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the above-mentioned not enough that exists among the prior art, and provide a reasonable in design, the dependable performance for oxygen concentration control device of low concentration gas heat accumulation oxidation.
The utility model provides a technical scheme that above-mentioned problem adopted is: this an oxygen concentration control device for low concentration gas thermal storage oxidation, its structural feature lies in, includes: a blending device, secondary blending device, draught fan, vertical regenerative oxidation device, combustible wet material desiccator, dust remover and chimney, a blending device is provided with flue gas inlet, air intlet and gas inlet, a blending device's flue gas inlet is connected with vertical regenerative oxidation device's low temperature exhanst gas outlet and dust remover's exhanst gas outlet simultaneously, and installs second valve and third flow appearance at a blending device's flue gas inlet, a blending device's air intlet is connected with fresh air, and installs first valve and second flow appearance at a blending device's air intlet, a blending device's gas intlet is connected with low concentration gas, and installs first flow appearance at a blending device's gas import, a secondary blending device is provided with gas mixture import, gas intlet and air intlet, the gas mixture import of secondary mixing device and the gas mixture exit linkage of a mixing device, and install first oxygen concentration measurement appearance and first gas concentration measurement appearance at the gas mixture export of a mixing device, the gas inlet of secondary mixing device simultaneously with the low temperature exhanst gas outlet of vertical heat accumulation oxidation unit and the exhanst gas outlet connection of dust remover, and install third valve and fourth flow meter at the gas inlet of secondary mixing device, the air inlet of secondary mixing device is connected with fresh air, and installs fourth valve and fifth flow meter at the air inlet of secondary mixing device, the gas mixture export of secondary mixing device is connected with the air inlet of draught fan, and installs second oxygen concentration measurement appearance and second gas concentration measurement appearance at the gas mixture export of secondary mixing device, the gas outlet of draught fan is connected with the air inlet of vertical heat accumulation oxidation unit, the high temperature exhanst gas outlet of vertical heat accumulation oxidation unit is connected with the flue gas inlet of combustible wet material desiccator, and installs third oxygen concentration measurement appearance at the high temperature exhanst gas outlet of vertical heat accumulation oxidation unit, the exhanst gas outlet of combustible wet material desiccator is connected with the flue gas inlet of dust remover, the exhanst gas inlet of chimney simultaneously with vertical heat accumulation oxidation unit's low temperature exhanst gas outlet and the exhanst gas outlet of dust remover be connected, and install the fifth valve at the exhanst gas inlet of chimney.
Further, the concentration range of gas in the low-concentration gas is 5-15%, the concentration of gas in the mixed gas output by the primary mixing device is less than 3%, the concentration of gas in the mixed gas output by the secondary mixing device is less than 1.2%, and the concentration of oxygen in the high-temperature flue gas output by the vertical heat storage oxidation device is lower than the concentration of oxygen required by spontaneous combustion of combustible wet materials at the temperature of the flue gas.
Further, the first valve, the second valve, the third valve, the fourth valve and the fifth valve are all electric adjusting valves and have a remote adjusting function.
Further, the first oxygen concentration measuring instrument, the first gas concentration measuring instrument, the second oxygen concentration measuring instrument, the second gas concentration measuring instrument and the third oxygen concentration measuring instrument all have functions of reading measured data and remotely transmitting the data.
Further, the first flow instrument, the second flow instrument, the third flow instrument, the fourth flow instrument and the fifth flow instrument have functions of reading measurement data and remotely transmitting the data.
Compared with the prior art, the utility model, have following advantage and effect: reasonable in design, simple structure, the dependable performance has rationally designed an oxygen concentration control device for low concentration gas heat accumulation oxidation to realize: the fresh air and the low-temperature flue gas are used for mixing the low-concentration gas for multiple times, so that the gas concentration value in the gas mixture entering the vertical heat storage oxidation device is effectively controlled, the running performance and the safety and reliability of the vertical heat storage oxidation device are improved, and the oxygen concentration value in the high-temperature flue gas output by the gas oxidation device is effectively controlled, so that the combustible wet material is prevented from spontaneously combusting in the drying process, and the running safety of the combustible wet material dryer is improved.
Drawings
Fig. 1 is a schematic structural diagram of an oxygen concentration control device for regenerative oxidation of low-concentration gas in an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.
Examples are given.
Referring to fig. 1, the oxygen concentration control device for regenerative oxidation of low-concentration gas in the present embodiment includes a primary mixing device 1, a secondary mixing device 2, an induced draft fan 3, a vertical regenerative oxidation device 4, a combustible wet material dryer 51, a dust remover 52, and a chimney 6.
The primary mixing device 1 in this embodiment is provided with a flue gas inlet, an air inlet and a gas inlet, the flue gas inlet of the primary mixing device 1 is simultaneously connected with the low-temperature flue gas outlet of the vertical heat-storage oxidation device 4 and the flue gas outlet of the dust remover 52, the flue gas inlet of the primary mixing device 1 is provided with the second valve 12 and the third flow instrument 23, the air inlet of the primary mixing device 1 is connected with fresh air 102, the air inlet of the primary mixing device 1 is provided with the first valve 11 and the second flow instrument 22, the gas inlet of the primary mixing device 1 is connected with low-concentration gas 101, and the gas inlet of the primary mixing device 1 is provided with the first flow instrument 21.
The secondary mixing device 2 in this embodiment is provided with a mixed gas inlet, a flue gas inlet and an air inlet, the mixed gas inlet of the secondary mixing device 2 is connected with the mixed gas outlet of the primary mixing device 1, the mixed gas outlet of the primary mixing device 1 is provided with a first oxygen concentration measuring instrument 24 and a first gas concentration measuring instrument 25, the flue gas inlet of the secondary mixing device 2 is simultaneously connected with the low-temperature flue gas outlet of the vertical thermal storage oxidation device 4 and the flue gas outlet of the dust remover 52, the flue gas inlet of the secondary mixing device 2 is provided with a third valve 13 and a fourth flow meter 26, the air inlet of the secondary mixing device 2 is connected with fresh air 102, the air inlet of the secondary mixing device 2 is provided with a fourth valve 14 and a fifth flow meter 27, the mixed gas outlet of the secondary mixing device 2 is connected with the air inlet of the induced draft fan 3, and the mixed gas outlet of the secondary mixing device 2 is provided with a second oxygen concentration measuring instrument 28 and a second gas concentration measuring instrument 25 And (6) an instrument 29.
In this embodiment, the air outlet of the induced draft fan 3 is connected to the air inlet of the vertical thermal storage oxidation device 4, the high-temperature flue gas outlet of the vertical thermal storage oxidation device 4 is connected to the flue gas inlet of the combustible wet material dryer 51, the third oxygen concentration measuring instrument 30 is installed at the high-temperature flue gas outlet of the vertical thermal storage oxidation device 4, the flue gas outlet of the combustible wet material dryer 51 is connected to the flue gas inlet of the dust remover 52, the flue gas inlet of the chimney 6 is connected to the low-temperature flue gas outlet of the vertical thermal storage oxidation device 4 and the flue gas outlet of the dust remover 52, and the fifth valve 15 is installed at the flue gas inlet of the chimney 6.
In this embodiment, the gas concentration range in the low-concentration gas 101 is between 5% and 15%, the gas concentration in the mixed gas output by the primary mixing device 1 is less than 3%, the gas concentration in the mixed gas output by the secondary mixing device 2 is less than 1.2%, and the oxygen concentration in the high-temperature flue gas output by the vertical heat-storage oxidation device 4 is lower than the oxygen concentration required for spontaneous combustion of combustible wet materials at the flue gas temperature.
In the present embodiment, the first valve 11, the second valve 12, the third valve 13, the fourth valve 14 and the fifth valve 15 are all electrically adjustable valves, and all have a remote adjusting function.
In the present embodiment, the first oxygen concentration measuring instrument 24, the first gas concentration measuring instrument 25, the second oxygen concentration measuring instrument 28, the second gas concentration measuring instrument 29, and the third oxygen concentration measuring instrument 30 each have a function of reading measurement data and transmitting the data remotely.
In the present embodiment, the first flow meter 21, the second flow meter 22, the third flow meter 23, the fourth flow meter 26, and the fifth flow meter 27 each have a function of reading measurement data and transmitting the data remotely.
The control method of the oxygen concentration control device for regenerative oxidation of low-concentration gas according to the embodiment is as follows:
the remote control platform is used for reading the measurement values of the flow meter, the oxygen concentration measuring instrument and the gas concentration measuring instrument, the opening values of all valves are obtained through matching calculation according to the oxygen concentration and the gas concentration, and the opening adjustment of all the valves is carried out through a remote instruction, so that the low-concentration gas heat storage oxidation system is remotely and intelligently controlled.
The values measured by various instruments are respectively as follows: flow rate measurement value Q of first flow meter 21aThe measured flow value Q of the second flow meter 22bThe measured flow value Q of the third flow meter 23cFlow measurement Q of a fourth flow meter 26dFlow measurement Q of the fifth flow meter 27eOxygen concentration measurement value of the first oxygen concentration measuring instrument 24
Oxygen concentration measurement of the second oxygen concentration measuring instrument 28
Oxygen concentration measurement value of the third oxygen concentration measuring instrument 30
Gas concentration measurement value of the first gas concentration measuring instrument 25
Gas concentration measurement value of the second gas concentration measuring instrument 29
In the control method, the specific operation flow is as follows:
operation S1:
defining: fresh air has an oxygen concentration of
The gas concentration in the low-concentration gas is
The oxygen concentration value of the flue gas required by the combustible wet material dryer 51 is
The operation S2 is performed.
Operation S2:
a prediction of the opening values of the first valve 11 and the second valve 12 is made, which satisfies:
the operation S3 is performed.
Operation S3:
opening and adjusting a first valve 11 and a second valve 12, and allowing fresh air, low-concentration gas and low-temperature flue gas to enter a first mixing device 1 for mixing to obtain primary gas mixed gas;
reading the measured flow value Q of the first flow meter 21aRead outFlow rate measurement Q of the second flow meter 22bReading the flow measurement value Q of the third flow instrumentcReading the measured value of the oxygen concentration of the first oxygen concentration measuring instrument 24
Gas concentration measurement value of the first gas concentration measuring instrument 25
The operation S4 is performed.
Operation S4:
when measured gas concentration
Greater than or equal to 3%, returning to the operation of S3;
when measured gas concentration
Less than 3%, S5 operation is performed.
Operation S5:
opening and adjusting the third valve 13 and the fourth valve 14, and allowing the primary gas mixture, the fresh air and the low-temperature flue gas to enter the first mixing device 2 for mixing to obtain a secondary gas mixture;
reading the flow measurement Q of the fourth flow meter 26dReading the flow rate measurement value Q of the fifth flow rate meter 27eReading the measured value of the oxygen concentration of the second oxygen concentration measuring instrument 28
Reading the gas concentration measurement value of the second gas concentration measuring instrument 29
The operation S6 is performed.
Operation S6:
when measured gas concentration
Greater than or equal to 1.2%, returning to the operation of S5;
when measured gas concentration
Less than 1.2%, S7 operation is performed.
Operation S7:
the induced draft fan 3 is started, the secondary gas mixture output by the secondary mixing device 2 enters the vertical heat-storage oxidation device 4 for oxidation, the high-temperature flue gas output by the vertical heat-storage oxidation device 4 enters the combustible wet material dryer 51, the fifth valve 15 is opened and adjusted, and the redundant low-temperature flue gas from the vertical heat-storage oxidation device 4 and the dust remover 52 is discharged outwards through the chimney 6;
reading the oxygen concentration measurement value of the third oxygen concentration measuring instrument
The operation S8 is performed.
Operation S8:
when in use
If so, the operation of S9 is performed;
when in use
When so, the operation is stopped.
Operation S9:
when in use
When so, the operation S3 is performed;
when in use
If so, the operation of S5 is performed;
when in use
When the operation is stopped.
In addition, the waste heat of the high-temperature flue gas is fully utilized after the combustible wet material is dried by the combustible wet material dryer 51, and then is discharged from a chimney.
In addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an example of the structure of the present invention. All the equivalent changes or simple changes made according to the structure, characteristics and principle of the patent idea of the utility model are included in the protection scope of the patent of the utility model. Various modifications, additions and substitutions may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (2)
1. An oxygen concentration control device for regenerative oxidation of low-concentration gas, comprising: the device comprises a primary mixing device (1), a secondary mixing device (2), an induced draft fan (3), a vertical heat-storage oxidation device (4), a combustible wet material dryer (51), a dust remover (52) and a chimney (6), wherein the primary mixing device (1) is provided with a flue gas inlet, an air inlet and a gas inlet, the flue gas inlet of the primary mixing device (1) is simultaneously connected with a low-temperature flue gas outlet of the vertical heat-storage oxidation device (4) and a flue gas outlet of the dust remover (52), a second valve (12) and a third flow instrument (23) are installed at the flue gas inlet of the primary mixing device (1), a first valve (11) and a second flow instrument (22) are installed at the air inlet of the primary mixing device (1), a first flow instrument (21) is installed at the gas inlet of the primary mixing device (1), and the secondary mixing device (2) is provided with a mixed gas inlet, Flue gas inlet and air intlet, the gas mixture import of secondary mixing device (2) and the gas mixture exit linkage of a mixing device (1), and install first oxygen concentration measurement appearance (24) and first gas concentration measurement appearance (25) in the gas mixture export of a mixing device (1), the gas mixture import of secondary mixing device (2) is simultaneously with the low temperature exhanst gas outlet of vertical heat accumulation oxidation unit (4) and the gas outlet linkage of dust remover (52), and install third valve (13) and fourth flow meter (26) in the gas mixture import of secondary mixing device (2), install fourth valve (14) and fifth flow meter (27) in the air intlet of secondary mixing device (2), the gas mixture export of secondary mixing device (2) is connected with the air inlet of draught fan (3), and install second oxygen concentration measurement appearance (28) and second gas concentration measurement appearance (2) in the gas mixture export of secondary mixing device (2) 29) The utility model discloses a smoke exhaust system, the gas outlet of draught fan (3) is connected with the air inlet of vertical heat accumulation oxidation unit (4), the high temperature exhanst gas outlet of vertical heat accumulation oxidation unit (4) is connected with the gas inlet of combustible wet material desiccator (51), and installs third oxygen concentration measurement appearance (30) at the high temperature exhanst gas outlet of vertical heat accumulation oxidation unit (4), the exhanst gas outlet of combustible wet material desiccator (51) is connected with the gas inlet of dust remover (52), the gas inlet of chimney (6) is connected with the low temperature exhanst gas outlet of vertical heat accumulation oxidation unit (4) and the gas outlet of dust remover (52) simultaneously, and installs fifth valve (15) at the gas inlet of chimney (6).
2. The oxygen concentration control device for regenerative oxidation of low-concentration gas according to claim 1, wherein the first valve (11), the second valve (12), the third valve (13), the fourth valve (14), and the fifth valve (15) are all electrically operated valves.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920781843.8U CN210320139U (en) | 2019-05-28 | 2019-05-28 | Oxygen concentration control device for thermal storage oxidation of low-concentration gas |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920781843.8U CN210320139U (en) | 2019-05-28 | 2019-05-28 | Oxygen concentration control device for thermal storage oxidation of low-concentration gas |
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| CN210320139U true CN210320139U (en) | 2020-04-14 |
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| CN201920781843.8U Active CN210320139U (en) | 2019-05-28 | 2019-05-28 | Oxygen concentration control device for thermal storage oxidation of low-concentration gas |
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