FR2459825A1 - METHOD FOR EXTINGUISHING HEATED BULK MATERIAL, IN PARTICULAR COKE - Google Patents

Abstract

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

Description

The invention relates to a method of extinguishing a material

  in bulk heated, in particular coke, by means of a liquid which

  flowing up and down through this material, which is isolated from

  outside air and the vapor formed by the extinguishing liquid being

  direct flow tapping with respect to the extinguishing liquid. The extinguishing of heated bulk materials, in particular coke, is carried out in open or closed fire-extinguishing containers and

  the extinguishing liquid is uniformly trickled over these materials.

  The extinguishing liquid vaporizes partially and subtracts from the

  their to the heated matter. The vapor formed by the extinguishing liquid

  is led into the atmosphere by a chimney.

  This process presents, in particular in the case of the former

  Coke tinction, the following disadvantages: The extinguishing vapor that forms in the bulk material brings with it into the atmosphere very fine grains in the form

of dust.

  As a result of gasification reactions taking place

  between the extinguishing agent and the bulk material, it is formed, for example

  in the case of coke, H2, Co, CO2, H2S and SO2 which are also

  vacuès in the atmosphere and are also lost in energy.

  Since the extinguishing agent escapes into the

  vaporous atmosphere, it must be continually replaced by

  new species of extinction, often with drinking water that is expensive.

  A particularly serious disadvantage is that the environ-

  of the extinguishing system is polluted in a large radius by strongly acidic water vapor and that, in the region of influence of the extinguishing vapors,

noticeable corrosions.

  In coke quenching, the acidity of the vapors can be attributed to the following correlations: When the coke is at high temperature, the sulfur present in the mass is mainly in organic combination. Hydrogen formed during the extinguishing process by virtue of the reaction of the gas to

  water is able, initially, ie in the nascent state, to se-

  the carbon compound, by reduction, the sulfur located near the surface. In coke quenching, this process occurs in both open and closed containers. For example, it has been observed that when the coke contains about 10 kg of sulfur per tonne before the extinction, it lost about 0.1 kg after the end of the extinction process.

  of sulfur. This amount of sulfur has converted to hydrogen sulphide.

  In conventional open fire trucks, during

  the process of extinction, the gas with water, and with it hydrogen sulphide

  mentioned, partially burn. About 50% of the hydrogen sulphide is converted into SQ2 * The remaining 50% still leave the chimney in the form of H2S. With regard to the formed SO2, with the prevailing temperature, the processes of condensation and the oxygen available in the tower

  of extinction, the essential conditions for wet catalysis are

  plaice. This causes the low pH and the highly corrosive effects of

fear of extinction.

  The object of the invention is to provide a method of extinguishing a heated bulk material in which there will be no exhausting agent vapors causing polluting emissions but in which, on the contrary, it will be possible to use and / or annihilate heat, dust and

  the gas contained in the extinguishing agent vapors.

  Starting from the method defined above, the problem posed is solved, according to the invention, by the fact that the heat of superheating of the extinguishing vapor, evacuated ducted without inclusion of air, is used to produce service steam that can be used in consumer appliances and then exhaustion is completely condensed, the solids contained in the latter being deposited

with the condensate.

  According to one embodiment, we start by driving the

  fear of extinction evacuated to a separator for the purpose of pre-dusting

  lable, before borrowing the heat of overheating.

  The heat of condensation, which still contains the extinguishing vapor after subtraction of the heat of superheating, can be

  transmitted particularly advantageously to a hot water circuit.

  By the process according to the invention, the solids deposited in the condensate can be removed without particular difficulties,

  so that the condensate can be used again extinguishing agent.

  According to one embodiment, the permanent gases contained in the extinguishing vapor are separated off, collected and then subjected to purification and are used for chemical processes or for

heating.

  The permanent gases separated from the extinguishing vapor can

  can also be introduced advantageously continuously in gas

  raw coke oven and serve, after purification, to heat the ovens.

  The problem which is at the basis of the invention and which is to avoid polluting emissions and, instead, to take advantage of the energies contained in the extinguishing vapor can also be solved, according to the invention, by a method of extinguishing coke with water

  flowing up and down through the coke that is isolated from the outside air

  a remarkable process in that the vapor formed by the water is channeled without inclusion of air and brought directly to a gas installation with water, the impurities entrained by this steam.

  and not subjected to the gasification being separated in a purification stage

  followed by the impurities of the formed gas, and that

  the gases contained in the steam are led to the gas generated water.

  The advantages that can be obtained by the process according to the invention are, in particular in the case of coke extinguishing, the following: There is no dust or polluting gases in the atmosphere. The gas is purified from the sulfur compounds and then used, in the sense of energy saving, as a heating gas or for

chemical processes.

  The environment of the extinguishing system is not polluted by extinguishing vapors that are condensed and have a strong

corrosive action.

  The condensed extinguishing liquid can be used again to

  extinguishing uses. This results in a noticeable saving of water.

  The heat of overheating and condensation contained

  in the extinguishing vapors can be recovered almost completely.

  An example of calculation will illustrate the meaning of the process according to the invention, in terms of the fight against pollution and

saving energy.

  A coking plant with an average capacity of 2,000 t of coke per day is operated according to the conventional extinction technique, with the following energy losses and emissions. Energy losses: gas at water 100,000 Nm3 / 24 h thermal energy contained in 2,200 GJ extinguishing fumes Emissions: dust 200 kg / 24 h sulfur in the form of: H2S 100 kg / 24 h S52 100 kg / 24 h. The above energies can be used at a rate of 80% by the process according to the invention and the pollutant emissions can

- be avoided completely.

  An embodiment of a coke extinguishing plant for carrying out the process is described more precisely below.

  according to the invention, shown schematically in the accompanying drawing.

  Coke extinguishing fumes, formed intermittently, leave at about 700 ° C an extinguishing vessel 1 and are widely

  dust from the separator 2. From the separator 2, the

  fears are conducted to a passive heat boiler 3, the section

  Pipe is adjustable by means of a shutter 13. In the passive heat boiler 3, the heat of superheating of the steam of

  extinguishing is used to produce service steam. The temperature

  erosion of the extinguishing vapor is reduced to about 3000C. The service steam (saturated steam at 12 bar) is stored in a tank 4 of

  or it is brought to unrepresented consumer devices.

  In a condenser 5 placed after the passive heat boiler 3, the extinguishing vapor is completely condensed and

  the residual dust settles with the condensate.

  In a filter 6, the solids are separated from the condensate and

  brings the condensate to an extinguishing water tank 7 from which it is

  fired as an extinguishing agent for the extinguishing vessel 1.

  In the condenser 5, the heat of overheating, which

  may still hold the extinguishing vapor, and the heat of con-

  densification are transmitted to a hot water circuit. Hot water is

  it is stored in a tank where it is pushed back through heat-consuming devices 16 by which it gives up the absorbed heat and arrives at a storage tank 9 where it is kept available

for the next cycle.

  The permanent gases contained in the extinguishing vapor

  are collected in a tank 10 where they are led through a

  sulfur-containing gas 11. The hydrogen-containing gas, thus purified, is dis-

  available for chemical processes or for heating.

  The permanent gases can also, without the interposition of a gas tank 10, be brought directly to pass through a scrubber.

  raw coke oven gas 12 and used for furnace heating after a

usual purification.

  It is also possible, for example, to bring the unpurified extinguishing vapor, immediately out of the extinguishing vessel 1, to a

  water gas installation 14 indicated in dashed lines. Impurities

  extinguishing vapor, to the extent that they have not been subjected to gasification, are removed in a purification stage

2459825

  which follows, together with the impurities of the gas formed. Gas

  contained in the extinguishing vapor are added to the gas with the water formed.

  Also in this variant, it avoids very effectively the emissions of dust and gas, as well as the environmental pollution by extinguishing vapors.

Claims (7)

R E V E N D I C A T I 0 N S   1. A process for extinguishing a heated bulk material, in particular coke, by means of a liquid that flows from top to bottom at   through this material, which is isolated from the outside air and the   fear formed by the extinguishing liquid being discharged in direct current with respect to the extinguishing liquid, characterized in that   the heat of overheating of the extinguishing vapor is used.   ducted in a ducted manner without the inclusion of air, to produce service steam for use in consumer appliances and then to completely condense the extinguishing vapor, the solids contained in   the latter is deposited with the condensate.   2. Process according to claim 1, characterized by the fact   that the exhausted extinguishing vapor is first   prior to dedusting, before borrowing the their overheating.   3. Method according to one of claims 1 or 2, characterized   in that the heat still contained in the extinguishing vapor is transferred to a hot water circuit after the heat has been removed. overheating.   4. A process according to any one of claims 1 to 3,   characterized in that the solids deposited in the con-   density and that the condensate is reused as extinguishing agent.   5. A process according to any one of claims 1 to 4,   characterized in that the permanent gases contained in the extinguishing vapor are separated, captured and subjected to purification.   and take advantage of it for chemical processes or for heating.   6. A process according to any one of claims 1 to 4,   characterized in that the continuous gases separated from the extinguishing vapor are introduced continuously into raw coke oven gas and   after purification, they are used for heating ovens.   7.- Process for extinguishing coke by means of water flowing up and down through the coke which is isolated from the outside air, a process which is remarkable in that the duct is channeled without inclusion of air. vapor formed by the water and that it is brought directly to a water gas installation, the impurities caused by this vapor and not subject to gasification being separated in a subsequent treatment stage, in same time as the impurities of the gas formed, and that the gases contained   in the steam are conducted with gas to the generated water.