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EP0263183A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

NH3-Injection controller

Assignee: Mitsubishi Heavy Industries Ltd
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Filing: 1987-03-13
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Granted: —
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Expires: 2007-03-13
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Abstract

Abstract A device for controlling the rate of NH 3 injection into a flue gas denitrification system, wherein the concentration of residual NH 3 at the outlet of the denitrification system is predicted to correct the injection rate, and at the same time abrupt increases in the gas flow rate and the concentration of NO x at the inlet of the denitrification system and deviations from the preset value of the concentration of NOx and NH 3 at the outlet of said denitrification system are all detected as pulse signals, thus enabling to control the injection rate of NH 3 in response to pulse signals, so that frequent fluctuations in the load can be sufficiently followed and excessive consumption of NH 3 can also be eliminated, thereby preventing the emission of unreacted NH 3 or harmful effects on subsequent equipment.

Inventors

  • 👤 Kazuo Mitsubishi Jukogyo Kabushiki Kaisa Sagara
  • 👤 Tomoyuki Nagai
  • 👤 Soichi N.S.& E.W. Mitsubishi J.K.K. Araki
  • 👤 Masanori N.S.& E.W. Mitsubishi J.K.K. Demoto

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-30 11:21
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8696; B01D53/30; B01D53/46; B01D53/54; B01D53/56; F; F23; F23J; F23J15/00; F23J15/003; F23J2215/00; F23J2215/10

Claims Analysis

Total Claims: 1
Claim 1
Independent Claim 331 words
An NH 3 injection controller which controls a quantity of NH 3 injected into a denitrating apparatus for exhaust gas, characterized by the provision of means for measuring a flow of exhaust gas introduced into the denitrating apparatus, means for determining a base quantity of NH 3 injected into the denitrating apparatus on the basis of a signal from the measuring means to produce a signal corresponding to the base quantity, means for detecting rapid increase of the flow of the exhaust gas and/or NOx concentration to produce a pulse signal corresponding to the rapid increase, means for measuring NOx concentration at an outlet of the denitrating apparatus, means for producing a pulse signal corresponding to a difference between the measured value of NOx and a set value of NOx, means for measuring NH 3 concentration at the outlet of the denitrating apparatus, means for producing a pulse signal corresponding to a difference between the measured value of NH 3 and a set value of NH s , means for estimating concentration of NH 3 remaining at the outlet of the denitrating apparatus on the basis of the flow of the exhaust gas, the NOx concentration in the exhaust gas, a denitration rate in the denitration reaction and the base quantity of the injected NH 3 , means for producing a correction signal on the basis of the estimated value of the remaining NH 3 , means for controlling a quantity of NH 3 injected into the denitrating apparatus in accordance with the base quantity signal of the injected NH 3 and the correction signal of NH 3 and means for controlling supply of NH 3 in the pulse manner in accordance with an amplitude and a width of the pulse signal produced in response to the rapid increase of the flow of the exhaust gas and/or the NOx concentration, the pulse signal corresponding to the difference of NOx and the pulse signal corresponding to the difference of NH 3 .

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