A high-efficiency denitrification ammonia injection system

A denitrification and high-efficiency technology, applied in separation methods, dispersed particle separation, chemical instruments and methods, etc., can solve problems such as uncontrollable materials, large quantities, continuous operation loss of processes, etc.

Active Publication Date: 2020-12-04
ZHONGYE-CHANGTIAN INT ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the round roller feeder often fails during the production process, such as: material leakage when the flue gas pressure changes, and the material cannot be controlled when the machine is stopped.
In addition, the number of round roller feeders is large (as long as one fails, the entire large-scale device has to be shut down), the cost is high, and maintenance is difficult, so it has brought certain restrictions on the development of activated carbon technology.
[0012] Secondly, for the feeding rotary valve in the prior art, there are the following problems: For the transportation of fragile particles such as desulfurization and denitrification activated carbon, the use of rotary valves on the one hand ensures the airtightness of the tower body, and on the other hand realizes the material flow. Transport without damage, but if the conveying medium is sheared due to the rotation of the blades during the conveying process of the rotary valve, see attached Figure 8 , will cause an increase in system operating costs
For a large adsorption tower usually with a height of about 20 meters, the failure of the round roller feeder or the rotary valve during the production process will cause huge losses to the continuous operation of the process, because the adsorption tower is filled with several tons of activated carbon , it is quite difficult to manually dismantle and repair or reinstall, and the impact and loss caused by shutdown are unimaginable

Method used

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  • A high-efficiency denitrification ammonia injection system
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  • A high-efficiency denitrification ammonia injection system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment A

[0103] like Figure 5 As shown in , the size (screen cut-off size) of the finished activated carbon recycled in the desulfurization ammonia injection system is required to be (diameter, D) × 6mm (length, h), then design a kind of sieve to be used in one layer of sieve of vibrating screen 3, wherein the width a and length L of the rectangular sieve hole are: 5mm (width a) × 27mm (Length L). Wherein D is the diameter of the circular cross-section of the activated carbon cylinder to be retained on the screen, and h is the minimum length of the granular activated carbon cylinder to be retained on the screen. a=0.833h.

Embodiment B

[0105] like Figure 5 As shown in , the size (screen cut-off size) of the finished activated carbon recycled in the desulfurization ammonia injection system is required to be (diameter, D) × 4mm (length, h), then design a kind of sieve to be used in one layer of sieve of vibrating screen 3, wherein the width a and length L of the rectangular sieve hole are: 3mm (width a) × 27mm (Length L). where D is the diameter of the circular cross-section of the granular activated carbon cylinder to be retained on the screen. a=0.75h. This mesh size screen is designed to retain medium particle size activated carbon.

Embodiment C

[0107] like Figure 5 As shown in , the size (screen cut-off size) of the finished activated carbon recycled in the desulfurization ammonia injection system is required to be (diameter, D) × 2mm (average length), then design a kind of screen cloth to be used in the layer screen cloth of vibrating screen 3, wherein the width a and the length L of rectangular screen hole are: 1.6mm (width a) × 16mm (Length L). where D is the diameter of the circular cross-section of the granular activated carbon cylinder to be retained on the screen. a=0.75h.

[0108] The adsorption tower generally has at least 2 activated carbon chambers.

[0109] Preferably, there is a circular roller feeder or discharge circular roller G at the bottom of each activated carbon chamber AC-c of the adsorption tower. Generally, the adsorption tower has at least two activated carbon chambers AC-c.

[0110] For the roller feeder or the discharge roller G described here, the roller feeder or the discharge roll...

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Abstract

The invention relates to a high-efficiency denitration ammonia spraying system. The system comprises an adsorption tower, a desorption tower, an ammonia gas mixing device, a first activated carbon conveying device, a second activated carbon conveying device, a first conveying pipeline and a second conveying pipeline; one side of the adsorption tower is provided with a flue gas inlet, and the otherside of the adsorption tower is provided with a flue gas outlet; the flue gas inlet is provided with a first ammonia spraying device; the lower part of an inner cavity of the adsorption tower is provided with a second ammonia spraying device; the first conveying pipeline is connected with a mixed gas outlet and the first ammonia spraying device; the second conveying pipeline is connected with themixed gas outlet and the second ammonia spraying device; a first activated carbon conveyor is used to connect a material outlet of the adsorption tower and a material inlet of the desorption tower; and a second activated carbon conveyor is used to connect a material outlet of the desorption tower and a material inlet of the adsorption tower. The ammonia spraying system provided by the invention sprays a small amount of ammonia gas at the lower part of the adsorption tower and the rear part of a bed layer, so that denitration efficiency can be increased, a utilization rate of an ammonia gas isimproved, and high-efficiency utilization of activated carbon is realized.

Description

technical field [0001] The invention relates to an activated carbon method flue gas purification device, which belongs to an activated carbon method flue gas purification device suitable for air pollution control, especially an efficient denitrification ammonia injection device for purification of sintering flue gas, and relates to the field of environmental protection. Background technique [0002] For industrial flue gas, especially sintering machine flue gas in the iron and steel industry, it is ideal to use desulfurization and denitrification devices and processes including activated carbon adsorption towers and desorption towers. In the desulfurization and denitrification devices including activated carbon adsorption tower and desorption tower (or regeneration tower), the activated carbon adsorption tower is used for adsorption of sulfur oxides, nitrogen, and Pollutants including oxides and dioxins, while the desorption tower is used for thermal regeneration of activate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/76B01D53/60B01D53/72B01D53/02
CPCB01D53/02B01D53/60B01D53/72B01D53/76B01D2251/2062B01D2253/102B01D2258/0283
Inventor 魏进超李俊杰康建刚
Owner ZHONGYE-CHANGTIAN INT ENG CO LTD
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