Application of gas generating conical furnace

Can you tell me what raw materials your conical furnace uses? Our unit burns small-grained white coal! The air output is about 6000m3/h.

Our unit mixes small seeds and medium lumps, and the effect is pretty good.

Our unit also installed a conical furnace in 2006, and the results were pretty good. Of course, the supporting grates, slag breaking bars, and flow baffles have also been changed. While the height-to-diameter ratio remains unchanged, the carbon layer has been raised, the blowing intensity has also increased, and the gas production has also increased. What was brought out from under the furnace did not change much.

Application status of the conical gas generator (1) 120 s gas production is adopted to give full play to the gas production capacity of the gas generator, effectively improve the composition of semi-water gas, meet the "three highs and one short" gas production requirements, and truly achieve high production and low consumption. (2) It is easy to operate, has greater operating flexibility than other furnace types, is easy to master and adjust, and can recover quickly if there are changes in the furnace. (3) The operator has wide adaptability. (4) The furnace condition is stable, with no blowover, wind tunnel, drift, hanging furnace, scarring, and no hanging materials or no ash discharge. Since the inner diameter of the jacket is small at the top and large at the bottom, the lower carbon layer descends smoothly and the slag discharge is uniform in size. (5) Compared with other furnace types, the furnace temperature can increase by about 50 to 100°C under the same conditions. * * Increase the gas production of the gas generator and * * Reduce the carbon content of ash. (6) The coal type has strong adaptability and can be burned in Yangquan, Jincheng and Ningxia in Shanxi, and can be mixed with some small coal (10~25mm). (7) Low investment, quick results, and installation is more convenient than other furnace types. (8) The process is simple, the pipeline is short, the resistance is small, the heat recovery efficiency is high, and the temperature of the semi-water gas can be reduced to below 30°C. The cone-shaped gas generator generally uses an ejection method for the upward gas pipe.

The ones used by our company are currently very good in all indicators. They use Shanxi lump coal and briquette coal.............

We also use a conical furnace and burn coal rods. The output in Taiwan is between 25 tons and 28 tons, but the effect is not very good. Furnace conditions are basically stable.

If you have any questions, please contact us Pizhou Junhao

There are many people researching this issue. It seems that in addition to Pizhou, there is also Boshan in Shandong.

Our group company has successfully completed the transformation of Φ2610/Φ2800 conical gas furnaces since April 2005 through repeated demonstrations and inspections from the perspective of technological advancement and rationality of economic benefits. There are 21 units in the first plant, 12 units in the second plant, 9 units are directly operated by the third plant, and 12 units are currently being put into operation in the second phase of the second plant, totaling 55 units. Since the re-election, the consumption of ammonia coal per ton has dropped from 1440kg/TNH3 in 2004 to about 1360kg/TNH3 in 2005. The upward carry-over has been significantly reduced, and the equipment service life has further increased. For now, the situation faced by our group company and many brother manufacturers is basically the same. The coal types are relatively mixed, the coal quality is relatively poor, and blue carbon is mixed with varying degrees. Inferior coal has a lower ash melting point, and the heat storage in the gas furnace cannot be too concentrated. This requires that in order to meet the needs of large-volume production, we must strengthen process management and pay more attention to the optimal configuration of production equipment in order to better adapt to the requirements of the production process. The following is a summary and analysis of the overall configuration, technical transformation, and production operation of our group's Φ2800 conical gas furnace, and we will communicate with our brother units. 1. Overall equipment configuration (high carbon layer, good heat storage effect) 1.1 Overall equipment configuration The technical transformation itself is to increase the gas production of a single furnace and optimize various operating indicators. The practical problem to be solved is how to solve the two major issues of slag breaking and flow prevention. For the problem of slag breaking, we choose Xingya’s new special furnace grate and new trapezoidal slag breaking strip (extending 100mm inside the ash silo shell) ； The anti-flow transformation is divided into two parts. The primary anti-flow is a 100mm slag breaking strip extending downward. The secondary anti-flow is a steel plate with a spacing of 20mm on the same horizontal plane of the ash pan, and welded steel plates with a spacing of 20mm at the outer shell of the ash silo. 1.2 Based on the wind pressure and heat storage effect of the fan, we increase the effective carbon layer to 2.45-2.60m. 1.3 The down-blowing steam inlet is changed from a single upward inlet to two inlets at the top. 1.4 The upstream and downstream valves were changed from Dg600 and Dg700 to Dg700 and Dg800. The upstream and downstream pipelines were also modified accordingly, and the valves were moved from outside the building to inside the building, closer to the furnace body. A downstream dust collector was installed at the bottom of the downstream valves. 1.5 Hydraulic system modification After the valve was enlarged, in order to improve the valve's action sensitivity, the solenoid valve flow rate was changed from 35L/min to 80L/min, and the transformer sensing signal was also modified accordingly. 2. Selection of process operating conditions 2.1 The purpose of transforming the gas furnace itself is to reduce the system resistance, that is, to reduce the resistance of the gasifying agent and gas. The distribution of gasification agent has become a subject in the process operating conditions. In fact, the process is adjusted around how to improve the gasification intensity. Our method of mixing coal into the furnace is: White coal (Jiaozuo, Gaoping, Henan): blue carbon 1:1. The characteristics of semi-coke determine the control of air volume. The coal particle size is small and the bed resistance is large. The air pressure is generally controlled at about 22KPa. In order to maintain the stability of the fire layer, the cycle time is 120S. 2.2 Inferior quality coal requires controlling the reasonable position of the fire layer. ①In terms of technology, due to the low melting point and high ash content of inferior coal ash, the fire layer must not be too concentrated and the fire layer should be appropriately elongated to thicken the gasification layer. The amount of material carried out and the requirements of the furnace temperature structure require that the gasification layer of the conical furnace is located in the middle and lower part of the jacket, so the fire layer can only be elongated downward, thereby making the ash layer from thick to thin, which is beneficial to improving the blowing efficiency and steam decomposition rate, thereby obtaining high-temperature gasification conditions. The downward elongation of the fire layer is achieved by increasing the steam on the second floor and appropriately reducing the downward blowing percentage. Properly increasing the opening of the down-blowing steam handwheel can move the vaporization layer downwards and control the fire layer at a reasonable middle and lower part. At the same time, due to the basic holding points of inferior coal and conical furnaces, reducing the down-blowing percentage can make the fire layer appropriately elongated. Because the ascending gas leaves the reduction layer faster than the oxidation layer, the gas quality is relatively better. ②In terms of equipment, due to the process requirements of inferior coal and the characteristics of the conical furnace, the fire layer is elongated downward. At the same time, the distance between the maximum rotation diameter of the Φ2610/Φ2800 gas generator grate and the slag breaking bar is 30mm-50mm less than the distance between the maximum rotation diameter of the grate and the slag breaking bar of the straight cylinder gas furnace. This means that the ash outlet is significantly reduced. This It is required that the material of the matching Φ2800 special grate, the heart of the gas generator, has further enhanced crack resistance and high temperature resistance. The slag breaking bars, especially the lower part of the slag breaking bars, should be appropriately widened and heightened to further improve the slag breaking ability of the grate, eliminate scarring conditions to a certain extent, and appropriately extend the service life of the grate. 2.3 Reasonable selection of air pressure and air volume ① Process aspects: Many manufacturers mix blue charcoal and the proportion is not fixed. Although the performance of blue charcoal is close to that of coke, with better chemical reaction activity and higher fixed carbon, its ash melting point is low, its mechanical strength is poor, and its thermal stability is poor. Therefore, the air pressure is generally selected to be 23 KPa, and the air supply time can be appropriately increased. ； Under the condition of ensuring that the height-to-diameter ratio of the gas furnace is appropriate, the effective carbon layer should be appropriately controlled to be higher, preferably 2.60m, to increase the heat storage. That is, the process of burning blue charcoal is suitable for weak wind and long blowing. ②Equipment: Due to the poor thermal stability and mechanical strength of blue charcoal, in addition to appropriately increasing the effective carbon layer and increasing the heat storage effect, the more important thing is how to reduce the carry-over and make the air distribution more uniform and reasonable. This requires that the air duct gap of the grate should be appropriately reduced (under the premise of keeping the total air volume unchanged) to make the gasification distribution of the gasification agent more reasonable and uniform. 2.4 Control and adjustment of furnace temperature structure ① Process aspects: For fixed layer gasification, the upward temperature is preferably controlled at 210~240℃, and the downward temperature is preferably 50℃-80℃ higher than the upward temperature. This is because if the upward temperature is high, the white coal will be heated rapidly after entering the furnace, the water in the coal will evaporate quickly, and the volatile matter will be discharged quickly, resulting in the drying layer and carbonization layer being too thin, and the lump coal will be easily crushed. According to the basic principle of fixed bed gasification, it is not difficult to see through corresponding analysis that as the gasifying agent passes through the fixed bed at a relatively low flow rate from bottom to top, the greater the pressure and the faster the speed, resulting in a significant increase in the carry-over in the gas. ； At the same time, according to the characteristics of the conical furnace, the flow rate is fast where the diameter is narrow, and the flow speed is slow where the diameter is wide. In order to save coal, reduce consumption, and reduce carry-over, the furnace temperature structure must be adjusted in the process to make the upward index more reasonable. ②Equipment: Due to the coal distribution characteristics of the automatic coking machine distributor, large coals are on the periphery and small coals are in the center. The large coals themselves have a large gap rate. At the same time, due to the characteristics of the cone-shaped furnace, the area is larger as it goes downwards, so the lower part of the carbon layer has a large gap rate. This requires that our main equipment is calculated for one furnace, and its side wind should not be too large. If the side wind is unreasonable, it will not only cause the upward furnace temperature to rise, but also cause unstable furnace conditions and high residual carbon content. In severe cases, it will cause carbon flow, furnace hanging and other phenomena. As a fixed-bed gasification gas generator, once the furnace is hung up, it is difficult to deal with it. The higher the furnace is hung, the easier it is to increase the upward temperature and bring out more objects. Therefore, it reduces coal consumption and reduces the drag-out. In addition to adjusting the furnace temperature in the process, the reasonable selection of the side air of the furnace grate is also crucial in the equipment. The increase in the aspect ratio of 2.5 requires a corresponding increase in the furnace entry pressure. Improving the effective carbon layer, increasing the content capacity and heat capacity of the furnace creates favorable conditions for further improving the gasification intensity and increasing the heat conversion rate. The temperature on the furnace is also effectively controlled accordingly, and the upward carry-over is further reduced. However, there are some gas generators where the furnace temperature is low, the ash bin temperature difference is large, and the furnace bottom retaining ring is red. This requires us to make further adjustments to the steam, reduce the handwheel on the second floor by 2~3 turns, and increase the steam entering the furnace. The given value is 0.F~0.3, so that the steam entering the furnace is controlled at 1.0 Kgf/Cm2 or so, so that the gasifying agent can penetrate the contents of the furnace to further achieve the balance between heat absorption and heat release. At the same time, the downward blowing steam handwheel on the second floor does not move or slightly decreases, and the upward blowing steam handwheel increases by 1 to 2 turns, which can establish a relatively stable ash and slag layer and further increase the gas production of a single furnace. In short, the advent of the φ2800 conical gas furnace, coupled with the matching Xingya special furnace calculation, has further increased the operating flexibility of the furnace temperature structure and facilitated adjustment, and the furnace conditions have been further optimized. The full production of the 41 machine has been reduced from the original 20 furnaces to the current 18.5 furnaces, and the coal consumption is also further declining. At present, there are still many imperfections in our process adjustments and operating conditions, and we need further guidance from brother manufacturers so that the φ2800 conical furnace can exert greater economic benefits.