Method for removing ammonium salt of sulfuric acid in exhaust gas treatment equipment and exhaust gas treatment equipment

A technology for waste gas treatment equipment and sulfuric acid, which is applied in the field of sulfuric acid ammonium salt removal and waste gas treatment equipment in waste gas treatment equipment, can solve the problems of rising equipment cost, complicated structure and piping, and sufficient time, so as to reduce equipment cost and simplify Piping structure and equipment, the effect of reducing heat energy costs

Active Publication Date: 2017-11-03
HITACHI ZOSEN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a problem that the heat energy from 160°C to 300°C is large, the thermal decomposition of the ammonium salt of sulfuric acid precipitated and deposited on the catalyst requires sufficient time, and the catalyst reaction tower is divided into multiple reaction parts. This leads to problems such as complicated structure and piping and increased equipment costs.

Method used

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  • Method for removing ammonium salt of sulfuric acid in exhaust gas treatment equipment and exhaust gas treatment equipment
  • Method for removing ammonium salt of sulfuric acid in exhaust gas treatment equipment and exhaust gas treatment equipment
  • Method for removing ammonium salt of sulfuric acid in exhaust gas treatment equipment and exhaust gas treatment equipment

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Below, according to Figure 1 ~ Figure 4 Example 1 of the present invention will be described.

[0071] (basic structure)

[0072] Such as figure 1 As shown, the waste gas treatment equipment is provided with a boiler 12 for recovering heat from waste gas and a cooling tower 13 for cooling the waste gas, for example, on the downstream side of an incinerator (furnace) 11 for waste. From the exhaust gas treatment line 10 connected to the cooling tower 13 toward the downstream side, a bag filter 16, a heat exchanger (heated side) 17, a gas reheater 18, a catalyst reaction tower 20, and a heat exchanger are provided. (Heating side) 17, induce air blower 21 and chimney 22, lead in and process waste gas in sequence.

[0073] The bag filter 16 is used to capture the hydrogen chloride and SO contained in the waste gas X , heavy metals, coal dust, dioxin, etc., an activated carbon supply device 14 and a medicament supply device 15 are provided on the upstream side of the bag...

Embodiment 2

[0125] like Figure 9 As shown, in other existing exhaust gas treatment equipment, in order to prevent the dew point corrosion and deliquescence of slaked lime brought about by the condensation of the bag type dust collector 16, hot air is blown to the bag type dust collector 16 for pre-treatment when starting. Hot bag type dust collector preheating route 50. The bag type dust collector preheating route 50 has a bag type dust collector preheater 53 and a bag type dust collector preheating blower 52. The bag type dust collector preheating route 50 includes: a suction flow channel part 50a, branched from the waste gas treatment route 10 on the outlet side of the bag type dust collector 16, and connected to the inlet of the bag type dust collector with a preheating blower 52 Connection; and the discharge channel part 50b is connected to the exhaust gas treatment line 10 on the inlet side of the bag filter 16 from the outlet of the bag filter preheater 53 . The outlet of the preh...

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Abstract

The invention provides a method for removing ammonium salts of sulfuric acid of an exhaust gas processing device, and the exhaust gas processing device. The method is small in energy cost and can reduce equipment cost. The device comprises a bypass gas-discharging line for discharging the exhaust gas discharged from a bag type dust collector to atmosphere, and a gas circulating line having a circulating blower, a circulating gas heater, a catalyst reaction towel and a heat exchanger. The ammonium salts of sulfuric acid accumulated in the catalyst reaction towel and the heat exchanger are decomposed by using the heated circulating heating gas. The gas circulating line is provided with a circulating gas discharging channel part for discharging a part of the circulating heating gas from the gas circulating line and guiding the discharged gas to an inlet of the bag type dust collector, and a supplement outside air introducing channel part for introducing the outside air into the circulating heating gas after the part of the circulating heating gas is discharged. Thermal decomposed components of the circulating heating gas discharged from the circulating gas discharging channel part is gathered by the bag type dust collector and then discharged to the atmosphere from the bypass gas-discharging line.

Description

technical field [0001] The invention relates to a method for removing ammonium salt of sulfuric acid in waste gas treatment equipment and waste gas treatment equipment. Background technique [0002] There is a catalyst denitration method on the exhaust gas treatment route, that is, a catalyst reaction tower is installed to blow ammonia gas into the exhaust gas to make it contact with the denitration catalyst to perform denitration. In this case, it is well known that ammonium sulfate (ammonium sulfate, (NH 4 ) 2 SO 4 ) and ammonium bisulfate (acid ammonium sulfate, NH 4 HSO 4 ) precipitates and accumulates in the catalyst in the catalyst reaction tower and the heat transfer tube of the heat exchanger arranged on the downstream side of the catalyst reaction tower, reducing the denitrification efficiency and heat transfer efficiency. [0003] In the usual exhaust gas treatment route, after cooling the exhaust gas with a cooling tower, blow neutralization and / or adsorption...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): B01D53/90B01D53/56B01D53/96B01J38/04
CPCY02P10/25Y02P20/129
Inventor田中徹松本宜之国木政德
OwnerHITACHI ZOSEN CORP