Process and system for the purification of waste gases charged with nitrogen oxides
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B01D-053/34
B01D-053/86
F23G-007/07
F23G-007/06
F27D-017/00
B01D-053/90
출원번호
US-0159682
(2016-05-19)
등록번호
US-10099174
(2018-10-16)
우선권정보
DE-10 2015 108 014 (2015-05-20)
발명자
/ 주소
Mulleder, Christian
Ortner, Franz
출원인 / 주소
CHEMISCH THERMISCHE PROZESSTECHNIK GMBH
대리인 / 주소
Schwabe Williamson & Wyatt, PC
인용정보
피인용 횟수 :
0인용 특허 :
2
초록▼
For purifying waste gas charged with nitrogen oxides in a reactor with heat-accumulator chambers containing heat-accumulator materials, the raw gas to be purified alternately enters one of the heat-accumulator chambers. Mixed with a reducing agent for the reduction of the nitrogen oxides, it is supp
For purifying waste gas charged with nitrogen oxides in a reactor with heat-accumulator chambers containing heat-accumulator materials, the raw gas to be purified alternately enters one of the heat-accumulator chambers. Mixed with a reducing agent for the reduction of the nitrogen oxides, it is supplied to a catalyst for the reduction of the nitrogen oxides, and the clean gas heats the heat-accumulator material in the heat-accumulator chamber which the clean gas exits. A partial flow is taken therefrom, heated by means of a heat source and, mixed with a reducing agent, supplied again to the heat-accumulator chamber which the raw gas enters. This heated, recirculated gas forms the only heat source for the overall system.
대표청구항▼
1. Process for the purification of waste gases charged with nitrogen oxides in a reactor with heat-accumulator chambers containing heat-accumulator materials, comprising a process in which waste gases to be purified enter at least one of the heat-accumulator chambers and are preheated by the heat-ac
1. Process for the purification of waste gases charged with nitrogen oxides in a reactor with heat-accumulator chambers containing heat-accumulator materials, comprising a process in which waste gases to be purified enter at least one of the heat-accumulator chambers and are preheated by the heat-accumulator material therein, are mixed with a reducing agent and a catalyst for reducing nitrogen oxide therein, producing denitrified hot clean gas that heats the heat-accumulator material in at least another of the heat-accumulator chambers, characterized by a recirculation system in which a partial flow of denitrified clean gas is taken from the at least one of the other heat-accumulator chambers which the denitrified clean gas exits before the denitrified clean gas enters the heat-accumulator material in another of the heat-accumulator chambers, the heat accumulation material in another of the heat-accumulator chambers being heated by means of a heat source,and in which a distribution grate is provided on the side of the heat-accumulator material of the heat-accumulator chambers facing the reduction catalyst for reducing the nitrogen oxides, a partial flow of the denitrified hot clean gas can be taken by the recirculation system by means of the distribution grate in the heat-accumulator chamber which the denitrified hot clean gas exits, further heated by means of the heat source and, mixed with the reducing agent, supplied to the distribution grate in the heat-accumulator chamber for heating the waste gases to be purified to the temperature required for the reduction of the nitrogen oxides,further in which the recirculation system has a circulation pipe by means of which the denitrified hot clean gas can be supplied from the distribution grate via a multi-way valve to the heat source, then to a device for supplying the reducing agent and via a multi-way valve to the distribution grate in the heat-accumulator chamber for heating the waste gases to be purified to the temperature required for the reduction of the nitrogen oxides. 2. Process according to claim 1, characterized in that the reactor has a plurality of pairs (P1, P2, P3) of heat-accumulator chambers, wherein each pair (P1, P2, P3) comprises a heat-accumulator chamber which the waste gases enters, a catalyst for reducing the nitrogen oxides and a heat-accumulator chamber which the clean gas exits, wherein a partial flow of the denitrified hot clean gas is taken from each of the heat-accumulator chambers which the denitrified hot clean gas exits and the partial flows taken are collectively supplied to the heat source by means of the recirculation system, mixed with the reducing agent and supplied again as a partial flow to the heat-accumulator chambers of the pairs (P1, P2, P3) which the waste gases enter. 3. Process according to claim 1, characterized in that the partial flow of the denitrified hot clean gas taken from the heat-accumulator chamber which the denitrified hot clean gas exits is between 2 and 15 percent of the clean gas. 4. Process according to claim 1, characterized in that only a part of the partial flow of the denitrified hot clean gas is supplied to the heat source and combined again with the remaining partial flow before being mixed with the reducing agent. 5. Process according to claim 1, characterized in that the partial flow of the denitrified hot clean gas with a temperature of at least 350° C. is mixed with the reducing agent. 6. Process according to claim 1, characterized in that the waste gases charged with nitrogen oxides contains organic compounds and/or carbon monoxide and each heat-accumulator chamber has a catalyst for oxidizing the organic compounds and/or carbon monoxide. 7. Process according to claim 1, characterized in that the waste gas charged with nitrogen oxides are the waste gases of an industrial process in which, due to the high processing temperature, nitrogen oxides are generated in the presence of air. 8. Process according to claim 1, characterized in that, for the pyrolysis of deposits on the heat-accumulator materials by means of the recirculation system, gas with a temperature of at least 400° C. is passed through the heat-accumulator material in order to pass it through the heat-accumulator material again after the pyrolysis products have been com busted by means of the heat source. 9. Process according to claim 1, characterized in that, due to a conversion of NOx, hydrocarbons and carbon monoxide, energy required for the reaction by the catalysts is at least partially or entirely provided by the process and thus, necessary primary energy is reduced or no longer required. 10. The process according to claim 1, characterized by a bypass pipe for bypassing the heat source in order to set the temperature of the denitrified clean gas mixed with the reducing agent by means of the reducing agent supply device, which can be supplied to the distribution grate in the heat-accumulator chamber for heating the waste gases to the temperature required for the reduction of the nitrogen oxides. 11. The process according to claim 1, characterized in that a mixer is arranged downstream of the reducing agent supply device in the circulation pipe. 12. Process for the purification of waste gases charged with nitrogen oxides in a reactor with heat-accumulator chambers containing heat-accumulator materials comprising a process in which waste gases to be purified enter at least one of the heat-accumulator chambers and are preheated by the heat-accumulator material therein, are mixed with a reducing agent and a catalyst for reducing the nitrogen oxides therein, producing denitrified hot clean gas that heats the heat-accumulator material in at least another of the heat-accumulator chambers, characterized by a recirculation system in which a partial flow of denitrified clean gas is taken from the at least one of the heat-accumulator chambers which the denitrified clean gas exits before the denitrified clean gas enters the other heat-accumulator material in another of the heat-accumulator chambers that is heated by means of a heat source, and in which a distribution grate is provided on the side of the heat-accumulator material of the heat-accumulator chambers facing the reduction catalyst for reducing the nitrogen oxides, a partial flow of the denitrified hot clean gas can be taken by the recirculation system by means of the distribution grate in the heat-accumulator chamber which the denitrified hot clean gas exits, further heated by means of the heat source and, mixed with the reducing agent, supplied to the distribution grate in the heat-accumulator chamber for heating the waste gases to be purified to the temperature required for the reduction of the nitrogen oxides,further in which the distribution grates have pipes extending across the heat-accumulator chamber and including a plurality of lateral openings for adding the reducing agent over the cross section of the heat-accumulator chamber. 13. The process according to claim 12, characterized in that, for supplying the waste gases and for discharging the denitrified hot clean gas, a waste gas supply pipe is provided for the heat-accumulator chambers. 14. The process according to claim 12, characterized in that the reduction catalyst is also suited for the reduction of hydrocarbons, dioxin and furan as well as other carbonic substances. 15. The process according to claim 12, characterized in that, an oxidation catalyst is arranged between the heat-accumulator material and the distribution grate in each heat-accumulator chamber for oxidizing organic compounds and/or carbon monoxide entering the waste gases.
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이 특허에 인용된 특허 (2)
Quirk Richard (Aughton GBX) Bird David A. (Rufford GBX) Shulver Ian N. W. (Southport GBX) McIntosh Robin M. (Newburgh GBX), Method for reducing nox emissions from a regenerative glass furnace.
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