SU372247A1 - ALL-UNION - Google Patents

Description

one

A method is known for producing energy gas from melted coal, a carbon of class O-10 mm by carrying out a process in a fluidized bed apparatus with an inert nozzle under pressure higher than 2 atm with the use of vapor-air blowing and a zone boiling layer.

For the purpose of heating the combustion heat of the proposed method, a part of the energy gas is passed through the upper part of the fluidized bed with the formation of gas components that mix up at the exit of the apparatus with the total gas flow, and the unreacted pulverized carbon formed during gasification and heat treatment and resinous vapors direct: onto a moving layer of inert air to form combustible components CO and H-2.

Into the lower oxidation zone of the fluidized bed. It is advisable to apply water sprayed with air.

The drawing shows a device for implementing the method.

Coal of class O-10 mm prepared in the fuel in the preparatory compartment is fed into bins / and 2. From the bunker / coal they are charged with a screw feeder to the fluidized bed of the lower part of the gas generator 3, and from the bunker 2 to the boiling layer of the heat treatment chamber 4, located at the top of the gas generator. Semi-coke formed in the chamber

through the central tube, non-periodically flows into the fluidized bed of the gasification zone. Pe, retracting the pipe is blocked by self-closing valves, which are opened by the weight of the semi-coke which has accumulated in it.

The ratio of the amount of fuel supplied to the gasification and the amount sent for pre-heat treatment, depending on the quality of the fuel, should be about 10: 1-2. In this case, the heat treatment can be carried out due to the physical heat of the gasification flue gases. In the gasification zone, a fluidized bed of fuel is created by supplying air IB to the sub-bridging chamber.

In the inflow zone of the fluidized bed a considerable amount of waste fuel ash accumulates, which through the central opening of the grate is removed to the receiving bin 5. To reduce the loss of physical heat from the ash to be removed (about 0.8-1.0% of the total heat ) sprayed air is supplied through pipe 6 to the ash removal hole. Good spraying of water, as well as the developed surface of coal ash, contribute to the rapid evaporation of water with the formation of superheated steam, which is necessary for the process of gassing. In this case, not only there is no need to supply steam from the outside from a special boiler house, but it also becomes possible to precisely control the temperature in the oxidizing zone of the gas generator.

The energy gas formed in the lower part of the gas generator mixed with decomposing steam with heat of combustion. About 1100–1150 kcal / nm (calculated as dry gas) and an operating temperature of 800–1000 ° C is divided into two streams. One gas stream through pipe 7 is removed together with non-reacting pulverized carbon into the hot filter 8, and the other, in an amount necessary for carrying out the heat treatment process in the fluidized bed, is fed into the chamber 4. The gas flow in this case is regulated by a valve located on the nozzle 9 of the device.

The energy groove and the vapor-gas mixture of the heat treatment process are fed into the apparatus with a moving inert fine-grained coolant. The resin vapors formed during the heat treatment, which fall on the hot surface of the coolant, are subjected to pressure and higher than 2 atra pyrolysis with the formation of an additional amount of high calorific gas. Due to the prolonged stay in the moving layer of the coolant, the particles of non-recirculating carbon 1 react with undecomposed water vapor with the formation of additional quantities of combustible components.

In the proposed process, the total heat of combustion of the energy gas coming out of the apparatus 10 will be equal to 1400 kcal / nm - 1100 kcal (heat of the flue gas of Gasification) + 200-230 kcal (due to the products formed during the heat treatment) + 70- 100 kcal (due to reduced carbon removal and pi.rolysis amols). ,

Subject invention

Claims (2)

1. A method for producing energetic gas from fine-grained coal by The process in a fluidized bed apparatus with an inert nozzle under pressure above 2 atm with the use of a steam-air blow and a fluidized bed zone, characterized in that, to increase the combustion temperature, a portion of the energy rasa is passed through the top of the fluidized bed, the resulting gas components At the exit of the apparatus, mixed naphtha pulverized coal formed during gasification and heat treatment and resin vapors are directed to a moving layer of inert packing, which are formed during gasification and heat treatment. 2. A method according to claim 1, characterized in that in the lower oxidation zone of the fluidized bed serves water sprayed with a shdozduh.