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Method for preventing denitration catalyst from being blocked

A denitration catalyst and denitration technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve problems such as increasing catalyst resistance, destroying catalyst activity, affecting denitration efficiency, etc. The plan is reasonable and practical, reducing the effect of out-of-stock reminders

Inactive Publication Date: 2020-04-28
TIANJIN TIANGANG UNITED SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the temperature range of 280-320°C, ammonium sulfate and ammonium bisulfate are highly viscous substances, which are easy to condense and deposit on the honeycomb pores on the surface of the catalyst, adhering to fly ash particles in the flue gas, clogging the catalyst and causing catalyst poisoning and destruction The activity of the catalyst increases the resistance of the catalyst and affects the denitrification efficiency

Method used

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  • Method for preventing denitration catalyst from being blocked
  • Method for preventing denitration catalyst from being blocked
  • Method for preventing denitration catalyst from being blocked

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0035] Such as Figure 1-3 As shown, the present invention discloses a method for preventing denitrification catalyst from clogging; the method is used in a denitrification system with 2N main flue passages 7; a desulfurizer adding system is arranged on one side of all the main flue passages 7, and the desulfurizer adding system is equipped with There is a desulfurizing agent, and the composition of the desulfurizing agent is CaO≥80.00wt%; SiO 2 ≤2.50wt%; MgO≤3.00wt%; S≤0.200wt%; according to Cao+SO 3 →CaSO 4 The principle, the desulfurizer can significantly reduce the SO in the flue gas 3 content, thus preventing NH 3 with SO 3Synthetic sticky substance. The desulfurizer of this composition solves catalyst clogging while the unreacted desulfurizer can be used in the subsequent wet denitrification process, that is, when solving the problem of catalyst clogging, the choice of desulfurizer should not affect the subsequent wet denitrification process. In addition, the parti...

Embodiment 2

[0042] It is known that the denitrification system includes a denitrification reactor. In this embodiment, on the basis of Example 1, the control temperature of the general denitrification reactor is set to 330°C-350°C; compared with 285°C-300°C in the prior art °C, when the reactor temperature is lower than 300 °C, the reverse reaction is likely to occur, resulting in sulfate blocking the catalyst.

Embodiment 3

[0044] This embodiment is based on the above-mentioned embodiments, increasing the flow rate of the dilution air and increasing the temperature of the dilution air; as known, the denitrification system also includes a denitrification dilution fan, which needs to blow in a large amount of air to dilute the ammonia to a certain level. After the ratio is sprayed into the denitrification reactor pipeline, so this embodiment increases the commonly used ammonia dilution air flow rate from 1200-1500m3 / h to 1800-1900m 3 / h, increase the temperature of the ammonia dilution air from 110°C-120°C to 180°C-200°C. Increasing the air volume of the dilution air can effectively reduce the ammonia-to-air ratio, so that the ammonia and air can be fully mixed and evenly sprayed into the reactor to prevent the local ammonia concentration from being too high. Increasing the temperature of the ammonia dilution air can effectively reduce the crystallization of ammonia in the ammonia injection grid du...

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PUM

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Abstract

The invention relates to the technical field of selective catalytic reduction (SCR), in particular to a method for preventing a denitration catalyst from being blocked. The method is used for a denitration system with 2N main smoke extraction channels. A desulfurizing agent adding system is arranged on one side of each main smoke extraction channel, and a desulfurizing agent is arranged in each desulfurizing agent adding system; the desulfurizing agent adding system comprises a powder bin; a feeding hole of the powder bin is connected with an ash tank truck through an ash beating pipeline; thebottom of the powder bin is communicated with a plurality of independent hoppers; the bottom of each hopper is connected with a constant feeder through a feeding pipeline, one side of each constant feeder is further provided with a conveying fan, and the other side of each constant feeder is connected with distributors in one-to-one correspondence with the main smoke suction channels; and each main smoke extraction channel is provided with a plurality of spray heads for introducing the desulfurizing agent, and the spray heads are connected with the corresponding distributors through quick connectors. The scheme provided by the invention is reasonable and practical, and can effectively reduce the probability that the surface of the denitration catalyst is blocked, thereby reducing the activity of the catalyst and poisoning and further influencing the denitration efficiency.

Description

technical field [0001] The invention relates to the technical field of selective catalytic reduction (SCR), in particular to a method for preventing clogging of a denitration catalyst. Background technique [0002] The SCR denitrification system uses a catalyst to mix the NOx in the flue gas with the ammonia gas injected by the ammonia gas supply system at a certain temperature and then undergo a reduction reaction to generate nitrogen and water, thereby reducing the emission of low NOx and reducing the impact of flue gas on the environment. pollution. SCR is a selective catalytic reduction technology. Because it has no by-products, no secondary pollution, simple device structure, high removal efficiency (up to 90%), reliable operation, and easy maintenance, it has been widely used in recent years. At present, the ammonia catalytic reduction method is the most widely used technology. [0003] Selectivity means that under the action of a catalyst and in the presence of oxyg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/75B01D53/83B01D53/86B01D53/90B01D53/50B01D53/56
CPCB01D53/508B01D53/75B01D53/83B01D53/8625B01D53/90B01D2251/2062B01D2251/402B01D2251/404
Inventor 甄众安文山孙彦广王贺建董云江董冠求于惠杨春伟
Owner TIANJIN TIANGANG UNITED SPECIAL STEEL CO LTD