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Apparatus for comprehensively utilizing coal mine to ventilate mash gas

A ventilation gas and coal mine technology, which is applied in the field of comprehensive utilization of coal mine ventilation gas, can solve the problems of not considering heat recovery and utilization, difficulty in meeting industrial applications, and difficult temperature control, achieving high strength, low resistance drop, and improving utilization rate Effect

Inactive Publication Date: 2008-10-01
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, based on the principle of regenerative catalytic combustion, US2003 / 0070549 adds an adsorption-desorption device before the regenerative combustion reactor, which first concentrates the combustible gas, and then undergoes catalytic combustion reaction. The system process is relatively complicated
In addition, the combustion catalyst used in the regenerative catalytic combustion process reported in the patent is a granular catalyst, which will inevitably increase the resistance drop for a ventilated gas treatment system with a large gas flow rate.
At the same time, the start-up method (Chinese patent ZL20040120402) of winding the electric heating belt on the outer wall of the reactor is difficult to meet industrial applications; in addition, the recovery and utilization of heat are not considered, so it is difficult to control the temperature in the system

Method used

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  • Apparatus for comprehensively utilizing coal mine to ventilate mash gas
  • Apparatus for comprehensively utilizing coal mine to ventilate mash gas
  • Apparatus for comprehensively utilizing coal mine to ventilate mash gas

Examples

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Effect test

Embodiment 1

[0047] Applying the above design scheme, a set of processing capacity of 20m 3 / h ventilation gas comprehensive treatment device, its external dimensions are 934mm×420mm×120mm. In order to have a clearer understanding of the characteristics of the ventilation gas treatment device under different working conditions, 42 temperature measurement points were arranged in the device, see Figure 4 . When the inlet concentration of methane is 4000ppm and the flow rate of air is 333.3L / min, the axial temperature distribution of the reactor under different switching frequencies (0.5min~1.5min) (Figure 5), it can be seen that the axial temperature distribution of the reactor It is a typical "saddle-shaped" distribution; the temperature on the catalysts on both sides of the U-shaped reactor is controlled at 550 ° C, and the conversion rate of methane can be maintained above 95%, see Image 6 . And the pressure drop of the device is about 3kPa, see Figure 7 for details. At the same tim...

Embodiment 2

[0049] The reaction device, temperature measurement and pressure measurement scheme are the same as those in Example 1. The inlet concentration of methane is 3000ppm, the flow rate of air is 666.6L / min, and when the temperature on the catalysts on both sides of the U-shaped reactor is controlled at about 650°C, the conversion rate of methane can reach more than 98%; and it can produce 5 grams of superheated steam at 270°C. The resistance drop of the bed layer is about 5kPa, see Figure 7 for details. The temperature distribution in the axial direction of the reactor is the same as that in Example 1, showing a "saddle-shaped" distribution; the temperature of the regenerator, catalyst, intermediate heat-taking part, and combustion tail gas outlet is the same as that in Example 1, which changes periodically with the flow direction.

Embodiment 3

[0051] The reaction device, temperature measurement and pressure measurement scheme are the same as those in Example 1. The inlet concentration of methane is 3000ppm, the flow rate of air is 333.3L / min, the temperature on the catalyst on the left side of the U-shaped reactor is about 360°C, and the temperature on the right side is about 550°C, and the conversion rate of methane can reach 90%. left and right, see Image 6 ; And it can produce 3 grams of superheated steam at 200 ° C per minute. The temperature distribution in the axial direction of the reactor is the same as that of Example 1, showing a "saddle-shaped" distribution; the temperature of the regenerator, catalyst, intermediate heat-taking part, and combustion tail gas outlet is the same as that of Example 1, which changes periodically with the flow direction.

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Abstract

A device for the coal ventilation gas comprehensive utilization, a reactor outlet end with the same structure is connected into a U-shape reactor through a heat taking device; the entrance of the reactor is filled with a honeycomb heat retaining mass; the outlet end is a catalyst bed layer; an electric heater is arranged between the heat retaining mass outlet end and the catalyst bed layer; the entrance of the raw gas is provided with a valve set for controlling the conversion of the current direction in the reactor; the raw gas enters the reactor, and generates the catalytic combustion on the catalyst bed layer; a saddle type bed temperature distribution is realized in the reactor by processing the periodic switch through the current direction of the reaction gas, the burning end gas is fetched out by the heat taking device. The invention has higher heat reclaim efficiency; when the concentration of the methane in the ventilation gas and the flow of the ventilation gas change, the high efficiency selfheating operation can be realized.

Description

technical field [0001] The invention relates to a comprehensive utilization technology of coal mine ventilation gas, which solves the problem of conversion and utilization of ventilation gas with low methane concentration (<1.0%), large gas flow and large fluctuations in concentration and flow, and can be applied to gas processing to achieve greenhouse gas emission reduction and energy recovery. Background technique [0002] The huge reserves of coalbed methane and the high combustion enthalpy of methane make it have potential energy recovery value. In addition, with the formal entry into force of the "Kyoto Protocol", CO 2 Emissions credits have become a hot commodity in the investment world. The greenhouse effect of methane is CO 2 Therefore, the comprehensive utilization of coalbed methane will produce direct economic benefits, as well as indirect environmental benefits. At present, the comprehensive utilization of coalbed methane has attracted widespread attention...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23G7/07
Inventor 王树东王胜李世英袁中山张朋张纯希张骋肖永家
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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