Preventive measures for blocking of two-stage gas furnace pipe:
1. Characteristics of the cold running of the gas generator furnace and distinguishing characteristics of the cold running of the gas generator furnace can be distinguished from the following aspects:
(1) can be seen from the furnace temperature, gas exit temperature is lower than the technical target, about 3000 mm Ø producer gas generator, the outlet temperature of the furnace general at 400 ℃;
(2) Open the fire hole investigation, furnace face is dark red;
(3) When the drill bit is checked, the oxide layer area shown on the drill bit appears dark red, and sometimes there is no fire layer area;
(4) Poor quality of gas.Sampling analysis shows that the content of carbon monoxide and hydrogen in mixed gas is low.
(5) Slag sampling analysis, carbon content is also high.
2, gas generation furnace cold running factors and treatment methods
(1) The full temperature is too high, when the water vapor content in the air supply to the furnace is high, so that the temperature in the furnace and fire layer drops, so that not only the carbon cannot be abundant oxidation, the carbon content in the slag is high;And the low temperature of the furnace does not provide sufficient heat for carbon dioxide recovery and water vapor differentiation, resulting in low carbon monoxide and hydrogen content in the gas.
Under such a working condition, the full temperature should be reduced by reducing the amount of water vapor in the wind, gradually improving the furnace temperature, making the oxide layer temperature in the furnace recover to normal, and then adjusting the full temperature to the normal value.
(2) the producer gas generator during operation, the operator failed to recuperate in time according to the gas production and coal, coal, coal seam is too thick, gray layer is too thin, sometimes even no ash layer, make the air entering the furnace to energetic preheating, furnace temperature drop, the deterioration of reaction, the gas outlet temperature is low, the gas of carbon monoxide and hydrogen content decreased, increased carbon content in slag.Under such working conditions, the ash and coal feeding should be reduced or suspended to cultivate the fire layer, so as to gradually recover the normal fire layer in the furnace.Strictly control the ash tray water level together to avoid the ash tray water level too high.
(3) gas attack amount of gas stove is too low, gasification speed in the furnace is slow, low furnace temperature.In this case, if more than one stove production, can reduce the number of production furnace, add production furnace blast volume, make it normal recovery.This incident occurs in a single furnace to produce gas, and in the furnace heat preservation waiting for production, the operation blindly reduce the amount of gas attack, ignoring the attack of cold operation of the attack furnace, gas furnace outlet temperature is too low, gas pipeline block.
On a single stove produces, the quantity of gas required for the kiln and the situation, in order to avoid pipeline jam, can adopt normal produce gas attack, some excess gas radiation to keep the gas outlet temperature, but the cost is high, so can make the fuel coal tossing in gas form the pollution of the environment, so, this kind of treatment method is not desirable.However, in order to avoid tar condensation and dust adhesion forming gas pipeline obstruction, the furnace can be produced intermittently during the heat preservation stage of the furnace, so that the furnace will no longer maintain constant temperature during the heat preservation period, but change within a certain temperature range. When the furnace reaches a high temperature section, the furnace will be stopped under the gas pressure.When the furnace reaches the low temperature section, the gas producer will normally produce and supply gas, and the furnace will heat up to the high temperature section, and then stop the gas pressure.Such circulation makes the tar condensed down when the gas pipe is stopped and vaporized when the gas is transported away with the gas, which can avoid the tar condensation, dust adhesion formed by the gas pipe obstruction.
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