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Dissolution preparation process of a coal-fired flue gas denitrification agent

A coal-fired flue gas and preparation process technology, applied in the direction of gas treatment, separation methods, and dispersed particle separation, can solve the problems of reducing denitrification efficiency, consuming large energy, blocking denitrification, etc., so as to avoid denitrification efficiency, reduce energy consumption, The effect of accelerating ion motion

Active Publication Date: 2021-06-01
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the defects and deficiencies of the above-mentioned technologies, the object of the present invention is to provide a process for the dissolution and preparation of a coal-fired flue gas denitrification agent, so as to solve the problem that in the traditional denitrification process, the solution often crystallizes out and blocks the nozzle of the pipeline, causing the interruption of denitrification, and heating and dissolving The process consumes a huge amount of energy, and uneven heating will also produce a large number of undissolved particles, which not only causes waste of energy consumption but also reduces the bottleneck problem of denitrification efficiency

Method used

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  • Dissolution preparation process of a coal-fired flue gas denitrification agent

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Embodiment approach

[0045] The dissolution preparation process of the coal-fired flue gas denitrification agent proposed by the present invention specifically includes arranging an alternating magnetic field and a permanent magnetic field around the sizing pipe of the denitrification process injection device, and under the combined action of stirring and magnetic field environment, the urea crystal is accelerated. The method of dissolving, and further dissolving and preparing the denitrification agent for coal-fired flue gas, the laboratory plan includes: setting up a constant magnetic field device and an alternating magnetic field device, and then placing urea taken from the factory in different magnetic fields for dissolution experiments.

[0046] (1) Setting of constant magnetic field device

[0047] Bind 6 to 18 iron cores on the side wall of a stainless steel container with a diameter of 32mm. The iron core specification is 2.5mm thick rare earth permanent magnets, such as magnetic tiles and ...

Embodiment 1

[0053] (1) Setting of constant magnetic field device

[0054] Bind 18 iron cores on the side wall of a stainless steel container with a diameter of 32mm. The iron core specification is a rare earth permanent magnet with a thickness of 2.5mm, such as magnetic tiles and magnetic rings. The width of the iron core is 5mm and the height is 4mm. At this time, the magnetic field strength is 900GS. The Gauss meter is used for testing, and the schematic diagram of the constant magnetic field device is shown in figure 1 shown;

[0055] (2) Setting of alternating magnetic field device

[0056] Use commercial power (50Hz) for alternating magnetic field setting, connect the solenoid lead-out line of the above-mentioned constant magnetic field generator to the voltage regulating transformer, adjust the voltage frequency output by the commercial power to adjust the magnetic field strength of the magnetic field to be the same as that of the constant magnetic field , both are 900GS, and test...

Embodiment 2

[0063] Same as Example 1, but different from Example 1, the consumption of urea is respectively 10~20g. Under the conditions of no magnetic field, constant magnetic field and alternating magnetic field, the schematic diagram of the time required for the complete dissolution of urea as a function of temperature is shown in Figure 4-6 .

[0064] The change diagram of temperature difference before and after 5g urea dissolves in embodiment 1 is as Figure 7 As shown, the schematic diagram of the change of temperature difference before and after dissolution of different masses of urea under the action of alternating magnetic field is as follows Figure 8 shown.

[0065] From Figure 3-6 It can be seen that the irregular thermal motion of urea solution molecules becomes more and more intense with the continuous increase of the magnetic field effect for the same mass of urea, that is to say, the Brownian motion becomes more and more intense, and the dissolution time becomes faste...

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Abstract

The invention discloses a process for dissolving and preparing a coal-fired flue gas denitrification agent, which includes spraying a reducing agent into a furnace, decomposing the reducing agent and reacting with the flue gas to perform denitrification, and the reducing agent includes urea. When spraying the reducing agent, a magnetic field and warm water are added, the magnetic field strength of the magnetic field is 300-900GS, and the temperature of the warm water is 20-40°C. The dissolution preparation process of the coal-fired flue gas denitrification agent accelerates the dissolution speed of urea, and reduces the huge energy consumption at high temperature required for the dissolution of urea in the original process, which plays the role of energy saving and low consumption. Low and ultra-stable emissions provide new technical support and are of positive significance to improving outdoor air quality.

Description

technical field [0001] The invention belongs to the technical field of industrial waste gas treatment, and in particular relates to a process for dissolving and preparing a coal-fired flue gas denitrification agent. Background technique [0002] In order to prevent the environment from being polluted by excessive NOx after coal combustion in the boiler, the soot should be denitrified. Selective non-catalytic reduction (hereinafter referred to as SNCR) and selective catalytic reduction (selective catalytic reduction (hereinafter referred to as SCR)) are commonly used for denitrification of coal-fired boiler flue gas. The SCR denitrification process is to spray NH 3 Restore NOx to N 2 and H 2 O, this technology can greatly reduce NOx emissions, and is an efficient flue gas purification technology; SNCR sprays reducing agents (ammonia, urea, etc.) Reduction of NOx to N 2 and H 2 O, although the SNCR denitrification process does not require catalyst catalysis, the SNCR den...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/78B01D53/56
CPCB01D53/56B01D53/78B01D2259/814
Inventor 肖勇强高亚萍王怡
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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