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Denitration integrated device and reducing agent flow adjusting method

An integrated device and reducing agent technology, applied in the field of denitrification, can solve the problems of high reducing agent usage, difficult control and management, and scattered distribution, and achieve the effects of reducing civil construction costs, reducing use costs, and stabilizing output pressure

Pending Publication Date: 2019-06-11
NANJING C HOPE ENVIRONMENTAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The SNCR denitrification system generally includes a reducing agent storage unit, an original agent delivery unit, a metering distribution unit, and a PLC control unit. In the existing SNCR denitrification technology, the above-mentioned units are set independently, and the units are connected by pipes and cables, and the distribution is scattered. , large area, high construction cost, difficult control and management
Existing SNCR denitrification system, the concentration control of nitrogen oxides in the outlet flue gas is unstable, the amount of reducing agent used is high, and the operating cost is high

Method used

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  • Denitration integrated device and reducing agent flow adjusting method
  • Denitration integrated device and reducing agent flow adjusting method
  • Denitration integrated device and reducing agent flow adjusting method

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Embodiment approach 1

[0029] refer to Figure 1 to Figure 5 , an integrated denitrification device, comprising a reducing agent delivery unit, a metering distribution unit, and a PLC control unit 4; the reducing agent delivery unit, metering distribution unit, and PLC control unit are integrated in a sealed cabinet. The PLC control unit is electrically connected with the reducing agent delivery unit, the metering distribution unit and the online ammonia nitrogen detection device at the flue gas discharge port.

[0030] In this embodiment, the reducing agent delivery unit and the metering and distributing unit are combined into a combined module, which includes two variable frequency plunger pumps 7 connected in parallel, a reducing agent input pipeline, a reducing agent total output pipeline, two A reducing agent output pipeline, a solenoid valve return pipeline and a manual regulating valve return pipeline.

[0031] Two frequency conversion plunger pumps 7 are installed on the bottom plate of the...

Embodiment approach 2

[0043] A reducing agent flow regulating method, used in the denitrification integrated device of Embodiment 1, comprising the following steps:

[0044] 8.1. When the ammonia nitrogen online detection device detects that the concentration of nitrogen oxides at the flue gas outlet decreases, the PLC control unit first reduces the input frequency of the variable frequency plunger pump 7 to reduce the output flow of the variable frequency plunger pump and reduce the output of the reducing agent;

[0045] 8.2. When the input frequency of the variable frequency plunger pump 7 drops to the set value, keep the input frequency of the variable frequency plunger pump unchanged, and the PLC control unit opens the electromagnetic regulating valve 13 to make the output of the variable frequency plunger pump Part of the reducing agent is returned to the reducing agent storage tank, further reducing the output of reducing agent;

[0046] 8.3. When the ammonia nitrogen online detection device ...

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Abstract

The invention discloses a denitration integrated device and a reducing agent flow adjusting method. The denitration integrated device comprises a reducing agent conveying unit, a metering distributionunit and a programmable logic controller (PLC) control unit, wherein the reducing agent conveying unit, the metering distribution unit and the PLC control unit are integrated in a sealed cabinet. Thedenitration integrated device has a small size, field arrangement is flexible, limitation of site is avoided, and installation also can be carried out in the open air, so that cost of civil engineering construction can be greatly reduced, and the device is particularly suitable for enterprises with limited installation space of old wires. According to the invention, denitration efficiency can begreatly improved, a higher denitration effect can be achieved with less reducing agent consumption, and operation cost of a whole selective non-catalytic reduction (SNCR) system is reduced.

Description

technical field [0001] The invention relates to the denitrification technology of the cement dry process production line, in particular to a denitrification integrated device and a reducing agent flow regulating method. Background technique [0002] There are many types of denitrification systems in existing cement production enterprises. Most of the operating equipment is relatively large and the structure is relatively complicated. The denitrification equipment occupies a large area and the construction cost is high. To the emission standards of air pollutants in the cement industry. As the country's requirements for nitrogen oxide emissions from cement clinker production lines become more and more stringent, many cement clinker production enterprises are also paying more and more attention to the operating efficiency and effect of the denitrification system in order to reduce the operating cost of the denitrification system and the export of flue gas. Nitrogen oxide reac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/56
Inventor 赵建李德祥周东海匡正贵杨俊强
Owner NANJING C HOPE ENVIRONMENTAL SCI & TECH