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Problems in the use of two - stage gas furnace equipment
TIME:2017-5-4 14:07:31 | VIEW:
Gas furnace is not normal and treatment:
In the operation of the gas furnace main furnace, and sometimes there will be abnormal phenomena, such as gas furnace temperature is too high or too low, slag carbon content increased, the furnace slagging, fire and other phenomena, are called abnormal furnace conditions. The main causes of this phenomenon are the following three aspects:
1, the supply of gasification materials do not meet the requirements, such as the quality of coal to reduce, containing ash, coal gangue increased; coal block degree is not uniform, coal-containing powder, deterioration of the furnace normal gasification conditions.
2, the furnace itself is flawed, such as coal system or ash system failure or damage to parts, resulting in coal, ash uneven and so on.
3, the furnace workers operating errors, such as the saturation temperature is not controlled, the coal, ash, furnace level changes in the situation is not timely monitoring and adjustment.
Of course, these reasons are not isolated, but interrelated, and sometimes the result of its common role. Therefore, the performance of the furnace is not normal and varied, intertwined, we here will be common to the normal furnace conditions summarized as three issues to be analyzed. In view of the normal production conditions, the first two factors have been basically fixed. Even if it appears, but also obvious, so in the analysis focus on operating factors and approach.
(A) the heat of the gas furnace
1, gas furnace heat operation characteristics and judgments
(1) can first be seen from the furnace temperature table, the gas furnace temperature exceeds the process of 3.2m furnace for the lower section of 600 ℃, the upper 120 ℃.
(2) to open through the hole observation, we can see the red or bright red surface, sometimes local flames.
(3) probing furnace can be found in the furnace there is slagging phenomenon, the brackets can not be inserted, the fire layer temperature is high, the brackets out when the fire area was yellow, and sometimes even brazing.
(4) gas sampling test, CO2 exceeds the specified value, gas heating value decreased.
2, the reasons for the formation of thermal operation and treatment methods
There are two common causes of thermal operation, for different reasons, to take a different approach.
(1) the saturation temperature is too low, that is, the amount of steam added to the bottom of the air duct is small, the amount of water vapor contained in the furnace into the furnace is insufficient, so that the temperature inside the furnace, especially the oxide layer, Slag melting point, the ash melting, forming a block.This is not only along the furnace section of the uniform supply of wind has been destroyed, deteriorating the furnace gasification conditions, and because of the presence of large slag, the air flow and carbon contact Surface reduction, carbon dioxide and water vapor failed to react fully with carbon through the reduction layer. The results of gas furnace out of the high temperature, gas in the C02, low calorific value.
When this occurs, the load on the furnace should be reduced, the saturation temperature should be increased, the temperature of the furnace should be reduced to the specified value, and then treated as follows:
When the slag is not serious, with the probe of the brazing interspersed, broken pieces, and appropriate to adjust the amount of coal and ash, so that the furnace gradually returned to normal.
When the furnace conditions deteriorate, the furnace into a piece of large pieces, in order to ensure the quality of gas and easy to handle, the furnace and the network disconnected, with large steel brazing and hammer to knock slag, to be basically processed Normal and then run.
When the stove can not be made into a single piece of material, had to stop the furnace slag, and then handle the furnace and then production.
(2) the production process, when the gas production changes, not timely adjustment of coal and ash amount, resulting in gray layer is too high, the oxide layer shift, gas furnace temperature increased.
When this happens, should be appropriate to speed up the ash and coal, so that the gray layer down to the specified value, the furnace can return to normal conditions.
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