[Introduction]: The high-efficiency and energy-saving two-stage gas furnace developed by Huangtai uses a unique dry distillation method to achieve the purpose of energy conservation and environmental protection. The Huangtai two-stage furnace series products won the title of national new product and the "first prize" of the Ministry of Machinery's scientific and technological progress. "Science and Technology Achievement Award", Shandong Provincial "Science and Technology Achievement Award", and "Silver Award of Shandong Spark Project Achievement Fair" are "high-efficiency, energy-saving and environmentally friendly products" recommended by the National Science and Technology Commission to the whole country.
[Application]: The two-stage gas furnace is widely used in steel, ceramics, magnesium metal, alumina, refractories, glass, metallurgy and other industries.
Two-stage gas furnace Working principle
Coal is added from the top and enters the two-stage gas generator dry distillation section (ie, the upper section). It is heated by the heat of the lower section of the gas to perform low-temperature dry distillation. The low-temperature carbonized gas and tar are produced, and then mixed with the gas from the gasification section rising from the lower section to form the upper section of gas. After low-temperature carbonization of coal, semi-coke is formed, and it is lowered to the gasification section and the gasification agent (mixed by air and steam) is oxidized and reduced to produce lower-stage coal gas. Part of this gas enters the carbonization section and directly directs the coal. For heating, the other part preheats the coal in the carbonization section through a partition wall composed of vertical channels. There is also a central tube that brings heat to the coal in the carbonization section and then discharges it. This is the lower gas.
Two-stage gas furnace Technological process:(hot gas station)
Qualified coal for gasification is added into the coal furnace by the automatic stoker. After dry distillation, the semi-coke moves down to the gasification section and reacts with gasifier to form gas (gasification agent is composed of air and steam).The gas produced by gasification section is divided into two parts: one part is drawn from the gas outlet of the lower section of the furnace, and the other part is from the upper section mixed up with the dry distillation air. The gas exported from the lower section enters the cyclone dust collector, wet disc valve and the ash hopper for dust removal and then enters the gas main pipe. The gas exported from the upper section first enters the electric tar-catcher to remove the tar, and then mixes up with the gas from the lower section in the gas main pipe. Finally, the mixed gas is sent to each gas supply point by gas pipeline.
Two-stage gas furnace Technological process:(cold gas station)
Qualified coal for gasification is lifted to the coal storage bin, and the coal storage bin is added into the furnace through an automatic coal feeder, and the coal is dry-distilled by being heated by the gas from the gasification section. The semi-coke after retorting is moved down to the gasification section and reacts with the gasification agent to generate coal gas (gasification agent consists of air and steam). The gas generated in the gasification section is divided into two parts: one part is discharged from the lower stage gas outlet of the double stage gas generator, and the other part is mixed upward with the dry distillation gas and discharged from the upper stage gas outlet. The gas at the outlet of the lower section enters the phenol water evaporation system, the air cooler cools down and removes dust, and then enters the indirect cooler to further cool down. The gas at the outlet of the upper section enters the Class I electric filter to remove tar, enters the indirect cooler to cool down, and then mixes with the lower section. The mixed gas enters a Class II electric filter to remove dust again. After degreasing, it is dehydrated by a gas pressurizer and desulfurized and sent to the gas consumption point.
Furnace body structure:
Parameter
| Model |
D2.0 |
D2.4 |
D2.6 |
D3.0 |
D3.2 |
D3.4 |
D3.6 |
| furnace inner diameter (m) |
2.0 |
2.4 |
2.6 |
3.0 |
3.2 |
3.4 |
3.4 |
| furnace sectional area (m²) |
3.14 |
4.52 |
5.3 |
7.07 |
8.04 |
9.08 |
10.18 |
| Working pressure of water jacket(Mpa) |
0.294 |
| steam output of water jacket(Kg/h) |
~340 |
~380 |
~420 |
~550 |
~650 |
~690 |
~710 |
| Fuel fragmentation and coal type(mm) |
20-40,25-50,30-60non-caking ,weakly caking coal,long flame coal ,lignite and gas coal |
| Fuel consumption(Kg/h) |
630~950 |
1000~3000 |
1430~1630 |
2000~2670 |
2200~2750 |
2450~3100 |
2750~3350 |
| Coal gas calorific value (low)(KJ/Nm³) |
up stage7400~7800 down stage5500~6000 mixture6450~6900 |
| Coal gas production(Nm³/h) |
1900~2800 |
3000~4000 |
4300~4900 |
6000~8000 |
7000~9000 |
7800~9900 |
9000~11000 |
| Gas temperature at furnace outlet(ºC) |
up stage100~150 down stage550~600 |
| Blast pressure at furnace bottom(Pa) |
<3000 |
<6000 |
<6000 |
<6000 |
<6000 |
<6000 |
<6000 |
| Gas pressure at furnace outlet(Pa) |
<1470 |
| Note: gas production and calorific value are related to coal type and coal quality |
Two-stage gas furnace Application case
Two-stage gas furnace is widely used in steel, ceramics, metal magnesium, aluminium, refractory material, glass, metallurgy and other industries.
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