Purifying agent for complex pellet flue gas

A purifying agent and pelletizing technology, applied in gas treatment, chemical instruments and methods, membrane technology, etc., to achieve high denitration efficiency, good environmental benefits, sustainable development potential, and high micropore volume.

Inactive Publication Date: 2020-04-17
BEIJING SHOUGANG INT ENG TECH
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AI-Extracted Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a high-efficiency purification agent for complex pellet flue gas, which not only solves the complex problems of pellet flue gas desulfurization, denitrification, and heavy metal removal, but also solves the increasingly stringent emission standards and complex flue gas characteristics. To remove dioxin a...
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Abstract

The invention discloses a purifying agent for complex pellet flue gas, and belongs to the technical field of complex pellet flue gas purification in the iron and steel industry. The purifying agent comprises 70-80 wt% of pulverized coal, 5-8 wt% of a suspending agent, 10-13 wt% of tar, 3-6 wt% of high-temperature asphalt and 2-3 wt% of titanium dioxide nanotubes. Preparation, mixing, profiling, carbonization, spraying and standing, activation and the like are carried out to obtain the efficient purifying agent. The efficient purifying agent is high in micropore rate and large in specific surface area, the problems of complex pellet flue gas desulfurization, denitration and heavy metal removal are solved, the problems of dioxin removal, F<-> removal and Cl<-> removal are solved, multi-pollution synergistic purification is achieved, valuable sulfur resources are recycled, and the efficient purifying agent can adapt to fluctuation of flue gas flow and pollutant concentration. The efficient purifying agent is adopted to replace the existing test case for treating the complex pellet flue gas with the active carbon, such that the efficient purifying agent has characteristics of high micropore volume, high desulfurization and denitration efficiency, and high F<-> and Cl<-> removal efficiency.

Application Domain

Gas treatmentDispersed particle separation

Technology Topic

ChemistryActivated carbon +12

Image

  • Purifying agent for complex pellet flue gas
  • Purifying agent for complex pellet flue gas
  • Purifying agent for complex pellet flue gas

Examples

  • Experimental program(1)

Example Embodiment

[0040] In order to verify the purification effect of the present invention, the following specific examples illustrate the implementation of the present invention, and those skilled in the art can understand other advantages and functions of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the technical innovation of the present invention.
[0041] It should be noted that the process equipment or devices not specifically noted in the following embodiments all adopt conventional equipment or devices in the art.
[0042] The core high-efficiency purification agent of the embodiment is prepared and prepared from coal powder, suspending agent, tar, high-temperature pitch, and titanium dioxide nanotubes. The examples are prepared as shown in Table 1:
[0043] Table 1. Percentage of high-efficiency purifying agent (%)
[0044]
[0045] (1) Coal powder is prepared according to the weight percentage of Table 1 above, mixed, and ground into powder with -0.074mm accounting for more than 90%.
[0046] (2) The suspension agent is prepared according to the amount percentage in the above table 1, and stirred to form the suspension agent.
[0047] (3) The prepared coal powder and suspending agent are added with tar, high-temperature pitch and titanium dioxide nanotubes according to Table 1 above, mixed and granulated after preparation, and pressed into a cylindrical column with a diameter of 7-9cm. The cylindrical shape is carbonized at 650℃~850℃, and the carbonized material is obtained after carbonization.
[0048] (4) Spray the suspending agent on the surface of the carbonized material, spray 10kg of suspending agent on the surface of 100kg of the carbonized material, and let it stand for 12h, then overturn it and let it stand for 12h.
[0049] (5) After standing for a total of 24 hours, the carbonized material sprayed with the suspending agent is steam activated at 1050°C to 1150°C, and the finished high-efficiency purifying agent is obtained after activation.
[0050] The high-efficiency purifying agent samples of Preparation Examples 1 to 8 replaced the existing activated carbon to perform a complex pellet flue gas purification test. The performance test process is as follows:
[0051] in figure 1 The said primary purification tower 5 is filled with eight layers of high-efficiency purification agent 6, each layer is 300mm high. The thermometer 7 measures the temperature in the high-efficiency cleaning agent 6 during the entire operation.
[0052] Introducing the complex flue gas produced by the actual pellets, the mass concentration analyzer 1 continuously records the flue gas composition and temperature, especially F - , Cl - With equal content, the heater 2 and the heat exchanger 3 adjust the flue gas temperature to within the range of 120-130°C, and no ammonia gas is sprayed temporarily. The secondary purification tower 10 and the high-efficiency denitrification tower 11 are all left empty. The regulating valve 8 is opened, and the flue gas at a temperature of 120 to 130° C. is passed into the primary purification tower 5, and the time for penetrating the high-efficiency purification agent 6 is recorded according to the data of the online analyzer 12.
[0053] Table 2. Micropore volume, desulfurization breakthrough time and F and Cl removal efficiency of high-efficiency purifier 6
[0054] Serial number Micropore volume (cm 3 /g)
[0055] It can be seen from Table 2 that the high-efficiency purifying agent of the present invention has a higher micropore volume than the activated carbon on the market. The larger the micropore volume, the longer the desulfurization penetration time, the higher the desulfurization efficiency, and the desulfurization efficiency. F - , Cl - effectiveness. If the entrance SO 2 If the concentration increases, the high-efficiency purifying agent 6 can be filled in the secondary purification tower 10. The SO will not be explained here. 2 The effect of increasing concentration on breakthrough time.
[0056] The first-stage purification tower 5 is filled with eight layers of high-efficiency purification agent 6, the second-stage purification tower 10 is left empty, and the high-efficiency denitrification tower 11 is filled with twelve layers of high-efficiency purification agent 6, the flue gas produced by the actual pellets is introduced, and the ammonia injection device 9 A certain amount of ammonia is injected, and the mass concentration analyzer 1 and the online analyzer 12 record the NOx data before and after purification.
[0057] Table 3. Denitration efficiency of high-efficiency purifier 6
[0058] Serial number Inlet NOx (mg/Nm 3 )
[0059] It can be seen from Table 3 that the use of the high-efficiency purifying agent of the present invention has a higher denitration efficiency than the activated carbon on the market, the efficiency is above 70%, and the maximum denitration efficiency is close to 80%. If the inlet NOx concentration increases, the secondary purification tower 10 can be filled with high-efficiency purifying agent 6 and ammonia gas can be injected. The influence of the increase of the NOx concentration on the denitration efficiency will not be explained here.
[0060] The above examples are to illustrate the disclosed embodiments of the present invention, and should not be construed as limiting the present invention. In addition, changes in the methods and components of the invention listed herein are obvious to those skilled in the art without departing from the scope of the invention.

PUM

PropertyMeasurementUnit
Diameter7.0 ~ 9.0cm
Length8.0 ~ 10.0mm
Density650.0 ~ 700.0kg/m³

Description & Claims & Application Information

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