DE10027200A1 - Process for the thermal disposal of high-calorific fractions from sorted waste and / or residues in fossil-fired power plants, especially lignite-fired power plants with wet flue gas desulfurization - Google Patents

Abstract

The invention relates to a method according to 19925011.1-13 for the thermal disposal of high-calorific fractions from sorted waste and / or residues in fossil-fired power plants, in particular lignite-fired power plants with wet flue gas desulfurization. DOLLAR A The object of the invention is to partially or completely free the coke formed in the pyrolysis of pollutants, in particular chlorine, and to dispose of the resulting waste products in a residue-free and environmentally friendly manner. DOLLAR A This is achieved according to the invention in that the coke formed in the pyrolysis from waste and / or residual material in a scrubber, in particular in a single-stage and / or multi-stage water and / or process water of a water bath and / or an immersion bath and / or or a jet bath freed of pollutants, especially chlorine, in a proportion of> = 50% and then the chlorine-reduced coke is fed to a conventional combustion process of a downstream steam generator and the washing water which is created in the scrubber and contains about 100 g / l of chloride is added to the water generated in the power plant process Flue gas desulfurization water is added in an amount of approx. 5% to approx. 10% and spent together with the steam ash as a stabilizer on the landfill.

Description

The invention relates to a method according to DE 199 25 011 for thermal Disposal of high calorific fractions from sorted waste and / or rest substance in fossil-fired power plants, especially lignite-fired power plants with wet flue gas desulfurization.

According to DE 199 25 011 is for thermal disposal of high calorific value Fractions known a process in which sorted waste and / or residues in fossil-fired power plants, especially in coal-fired power plants wet flue gas desulfurization plant, is spent. The behan is Deleted and processed waste / residual material in pellets or briquettes known per se pressed or a thermal treatment (pyrolysis) to form koksar material and energy-rich gas and, if necessary, controlled in Ab dependence on the necessary gas and coke analyzes as well as the gas and Amounts of coke with additives and the coal stream in the unloading bunker and / or a coal bunker and / or a steam generator bunker and / or a coal distributor in front of or in the area of a coal chute and / or egg ner smoke evacuation in a proportion of max. 5% of the allot coal ge preferably added from preferably 60% firing capacity of the boiler.

Furthermore, the processed and treated waste / residue from a coal mill fed and burned in the steam generator, which in the thermal loading energy generated gas partially or completely on direct supplied to the steam generator and partially or completely is burned without a separate cleaning.

Disadvantageously, during the pyrolysis process, coke is produced Pollutants, especially with chlorine, is added.

The invention has for its object the resulting during pyrolysis Coke partially or completely from pollutants, especially chlorine liberate and the resulting waste products free of residues and the environment to spend friendly.

This is achieved according to the invention in that the pyrolysis from garbage and / or coke produced in a scrubber, in particular in a single-stage and / or multi-stage tempered with ambient temperature Water and / or process water from a water bath and / or a diving pool  of and / or a jet bath of pollutants, especially chlorine, in the proportion freed from ≧ 50% and then the chlorine-reduced coke to a con tional combustion process of a downstream steam generator leads.

The invention is explained in more detail below using an exemplary embodiment become. The accompanying drawing shows the scheme of the procedure for removing chlorine from coke.

In the process for the thermal disposal of high-calorific value fractions with a high to low calorific value, processed and / or pretreated and / or untreated and / or sorted and / or unsorted waste 1 and / or residual material is either pressed in containers or pressed as pellets and / or as briquettes and / or in bulk with an edge length of max. ≦ 200 mm burned in fossil-fired power plants. In particular, it concerns coal-fired power plants with a wet flue gas desulphurization plant. The thermal treatment of the waste 1 and / or residual material is realized via pyrolysis 2 . The garbage 1 and / or residual material with a max. Edge length of 200 mm per piece in the largest extent subjected to thermal treatment (homogenization) in the form of pyrolysis 2 with a pyrolysis tube as a ballast in front of a fossil-fired power plant. In the process of pyrolysis 2 of waste 1 and / or residual material, coke 3 and high-energy gas are produced. The coke 3 is in a one-stage and / or multi-stage scrubber 42 , the water and / or process water being at ambient temperature, in a water bath and / or immersion bath and / or jet bath of pollutants, especially chlorine, in a proportion of ≧ 50% exempted. Then the chlorine-free coke 5 is fed to a downstream steam generator 9 together with the high-energy gas and coal in a conventional combustion process.

Through additional intensive tests it was found that the chlorine fraction of the gas / coke mixture of ≦ 40 kg HCl / h is to be observed with a significantly higher chlorine input of waste 1 and / or residual material compared to coal, in order to avoid the negative consequences of corrosion in the plants .

The resulting in the washer 4 with about ≦ 100 g / l chloride offset Waschwas ser 6 the commonly encountered in the power plant process Rauchgasent is desulphurisation water 7 is added in an amount of about ≦ 5% to about ≦ 10%, and together with the boiler ash 8 spent as Stabilisat 10 on a landfill.

The following advantages are achieved by the invention:

• - Environmentally friendly shipment of the waste products resulting from the process through residue-free disposal in the existing power plant process
• - The coke produced during pyrolysis is largely exempt from Pollutants, especially chlorine
• - Use of the washing water created during the washing process as Sta bilisat when the boiler ash is brought to the landfill

List of the reference symbols used

1

rubbish

2

Pyrolysis

3rd

coke

4

washer

5

coke

6

Wash water

7

Flue gas desulfurization water

8th

Boiler ash

9

Steam generator

10th

Stabilize

Claims (3)

1. The method according to DE 199 25 011 for the thermal disposal of high-value fractions from sorted waste and / or residual material in fossil-fired power plants, in particular coal-fired power plants with wet flue gas desulfurization, in which the waste / residual materials are processed and treated and known Pressed pellets / briquettes or subjected to thermal treatment (pyrolysis) to form coke-like material and high-energy gas and, if necessary, controlled with additives, the coal stream in the unloading bunker and / or controlled depending on the gas and coke analyzes required as well as the gas and coke quantities. or a coal belt and / or a steam generator bunker and / or a coal distributor in front of or in the area of a coal chute and / or a flue gas recirculation in a proportion of max. 5% of the feeder coal quantity, preferably from 60% firing capacity of the boiler, is given up directly, fed together to a coal mill and burned in the steam generator, the energy-rich gas produced during the thermal treatment being supplied to the steam generator partly or completely directly and with partial or complete Ver Zicht is burned to a separate cleaning, characterized in that the coke formed during the pyrolysis of waste and / or residual material in a scrubber, in particular in a one-stage and / or multi-stage water and / or process water of a water bath and / or at ambient temperature an immersion bath and / or a nozzle bath is freed of pollutants, especially chlorine, in a proportion of ≧ 50% and then the chlorine-reduced coke is fed to a conventional combustion process of a downstream steam generator. 2. The method according to claim 1, characterized in that in the washer resulting wash water with approx. g 100 g / l chloride added to the in the power flue gas desulfurization water in an amount of approx. ≦ 5% to approx. ≦ 10% is added and together with the steam boiler ash is brought to the landfill as a stabilizer.   3. The method according to claim 1, characterized in that untreated Garbage / residue with high to low calorific value unsorted in loose form an edge length of max. 200 mm per piece of waste and / or per residue Undergoes pyrolysis.