Lime kiln combined denitration system

A lime kiln and denitrification technology, which is applied in the field of lime kiln combined denitrification system and denitrification equipment, can solve the problems that cannot fully meet the quality requirements of lime kiln flue gas emission, achieve reduced atomization medium consumption, increased reaction time, and low ammonia water pressure Effect

Pending Publication Date: 2018-06-26
SHIJIAZHUANG XINHUA IND FURNACE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The SNCR denitrification process of the prior art is applied to the circulating fluidized bed boiler, and the denitrification efficiency is between 30-50%. It has not been found that the SNCR d

Method used

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  • Lime kiln combined denitration system
  • Lime kiln combined denitration system
  • Lime kiln combined denitration system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Lime kiln combined denitrification system of the present invention such as figure 1 As shown, it includes a compressed air storage tank 1, a reducing agent storage tank 2, a demineralized water storage tank 3, a denitration agent storage tank 4, a waste water treatment device 5, a static mixer 14 and a lime kiln. The reducing agent in the reducing agent storage tank 2 is hydrogen, and the denitrating agent in the denitrating agent tank is ammonia water. The denitration agent storage tank is equipped with an automatic overflow pipeline and a discharge pipeline, and is connected with the wastewater treatment device. The lime kiln is a double chamber kiln, such as figure 2As shown, the double-chamber kiln is provided with a channel 6 and a calcination zone 34, and the channel is provided with a reducing agent spray gun 22 and a denitrifying agent spray gun 28, and the reducing agent spray gun and the denitrating agent spray gun are arranged in the two kiln chambers of th...

Embodiment 2

[0025] Another embodiment of the present invention is as image 3 As shown, the lime kiln is a rotary kiln 29, and the rotary kiln includes a kiln head, a kiln tail and a preheater 30, and the preheater is connected to the kiln tail. Reductant spray gun 22 and denitration agent spray gun 28 are arranged at the kiln tail. The reducing agent spray gun is provided with a reducing agent inlet and a compressed air inlet, and the denitration agent spray gun is provided with a denitrification agent inlet and a compressed air inlet. The compressed air storage tank is respectively connected to the compressed air inlet of the reducing agent spray gun and the denitration agent spray gun and the compressed air main pipe 15, the compressed air 33 branch pipe and the compressed air branch pipe 21. The reducing agent storage tank 2 is connected to the reducing agent inlet of each reducing agent spray gun through the reducing agent main pipe 18 , the reducing agent branch pipe 26 and the red...

Embodiment 3

[0027] Yet another embodiment of the present invention is as Figure 4 As shown, the lime kiln is a beam kiln 45, and the beam kiln includes a feed system 38, a kiln body and a discharge port 37. The kiln body is provided with a preheating zone 35 , a calcining zone 34 and a cooling zone 36 . The preheating zone is provided with an upper suction beam 39, the lower part of the upper suction beam is provided with a denitrification beam 41, the calcining zone is provided with a combustion beam 42, and the cooling zone is provided with a lower suction beam 43. The upper suction beam is provided with a denitration spray gun 40, the lower suction beam and the denitration beam are provided with a denitration channel 44, the denitration spray gun and the denitration channel are provided with a denitration agent atomizer, and the denitration agent atomizer is provided with a denitrification agent inlet and a compressed air inlet . The desalinated water storage tank is connected to th...

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PUM

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Abstract

The invention relates to a lime kiln combined denitration system. The lime kiln combined denitration system comprises a compressed air storage tank, a reducing agent storage tank, a desalted water storage tank, a denitration agent storage tank and a lime kiln, wherein the lime kiln is provided with reducing agent spraying guns and denitration agent spraying guns; the compressed air storage tank isconnected to compressed air inlets of the reducing agent spraying guns and denitration agent spraying guns through a compressed air main pipe, compressed air secondary pipes and compressed air branched pipes; the reducing agent storage tank is connected to reducing agent inlets of the reducing agent spraying guns through a reducing agent main pipe, a reducing agent secondary pipe and reducing agent branched pipes; the denitration agent storage tank is connected to a static mixer through a denitration pump and a metering instrument; the desalted water storage tank is connected to the static mixer through a desalted water pump and the metering instrument; the static mixer is connected to denitration agent inlets of the denitration agent spraying guns through a denitration agent main pipe, adenitration agent secondary pipe and denitration agent branched pipes. According to the lime kiln combined denitration system, the combined denitration system with combination of denitration by the denitration agent and denitration by the reducing agent is used for denitrating; the selective non-catalytic reduction denitration efficiency of the smoke of the lime kiln is improved.

Description

technical field [0001] The invention belongs to the technical field of tail gas treatment of industrial furnaces and kilns, and relates to denitrification equipment, in particular to a lime kiln combined denitrification system. Background technique [0002] Flue gas is the main discharge of the lime kiln, which is a mixed gas produced by the combustion of combustibles in the kiln and the decomposition of limestone. Since the flue gas contains a large amount of nitrogen oxides such as NOx, if these nitrogen oxides are directly discharged into the atmosphere, they will pollute the air, form photochemical smog and acid rain, and endanger human health. Therefore, the flue gas must be denitrified before being discharged ( That is, denitrification) treatment. [0003] At present, there are two main flue gas denitrification technologies: Selective Reduction Reduction (SCR) technology and Selective Non-Catalytic Reduction (SNCR) technology. Selective non-catalytic reduction (SNCR)...

Claims

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Application Information

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IPC IPC(8): B01D53/56B01D53/76B01D53/79B01D53/83F27D17/00
CPCB01D53/56B01D53/76B01D53/79B01D53/83F27D17/008B01D2251/204B01D2251/202B01D2251/2067B01D2251/208B01D2251/2062Y02P10/143Y02P10/25
Inventor 贾会平
Owner SHIJIAZHUANG XINHUA IND FURNACE CO LTD
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