Smoke gas extraction system applied to ammonia escape detection and smoke gas extraction method

An extraction system and ammonia escape technology, applied in the fields of flue gas extraction, ammonia escape detection, and flue gas extraction systems, can solve the problems of easy blockage and can not represent the overall level of flue gas in the flue very well, so as to prolong life and save money. Cleaning and maintenance costs, reducing the effect of ammonium salt crystallization

Pending Publication Date: 2018-07-27
陕西凯特自动化工程有限公司
View PDF6 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The purpose of the present invention is to overcome the technical problems that the sample gas extracted by the existing flue gas extraction device cannot represent the overall level of flue gas in the flue very well and is easy to block, and to provide a flue gas extraction system and Fume extraction method

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Smoke gas extraction system applied to ammonia escape detection and smoke gas extraction method
  • Smoke gas extraction system applied to ammonia escape detection and smoke gas extraction method
  • Smoke gas extraction system applied to ammonia escape detection and smoke gas extraction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] This embodiment provides a flue gas extraction system applied to the detection of ammonia escape, including a flue gas sampling device and an extraction power device, and also includes an anti-blocking device. The extraction heads 2 distributed in an area matrix, a plurality of extraction heads 2 are connected to the mixed gas main tank 9 through the sampling pipeline 3, and the mixed gas main tank 9 and the anti-blocking device are connected to the sampling pipeline 3 in parallel, and are all provided with valves, so The extraction power unit is connected to the mixed gas main tank 9. The mixed gas master tank 9 is connected with an ammonia escape detection device (to detect the amount of ammonia escape).

[0039] Principle of the present invention:

[0040] Since there is almost no straight pipe section in the rectangular duct of the flue 21, there are disturbance factors such as supports in the flue 21, which causes the flue gas flow field here to be chaotic. Moreo...

Embodiment 2

[0043] On the basis of Embodiment 1, this embodiment provides a smoke extraction system applied to the detection of ammonia escape. The hole diameter of the head 2 is related to the function of the smoke flow velocity at the location, and the location where the extraction head 2 has a large smoke flow velocity corresponds to a large hole diameter of the extraction head 2 .

[0044] To ensure that the extracted sample gas composition can represent the average composition of the flue gas in the flue 21 to the greatest extent, first arrange a plurality of extraction heads 2 in the flue 21 (for example, a 4m x 6m The flue 21 is arranged with 16 extraction heads 2; the 7m×9m flue 21 of the 600MW unit is arranged with 24 extraction heads 2); secondly, the amount of sample gas extracted by each extraction head 2 and the extraction head The flue gas flow rate in the pipe at the location of 2 must be proportional, and multiple extraction heads 2 cover the flue section.

[0045] Flue g...

Embodiment 3

[0059] On the basis of Embodiment 1, this embodiment provides a flue gas extraction system applied to ammonia escape detection, the anti-blocking device includes a back-purging device and a first jet pump 7, and the back-purging device includes Back purge pipeline and hot compressed air tank 18, described hot compressed air tank 18 communicates with sampling pipeline 3 through back purge pipeline, first solenoid valve 4 is arranged on the described back purge pipeline, and described sampling pipeline 3 and the communication pipeline of the mixed gas main tank 9 is provided with a second electromagnetic valve 5, the outlet of the first jet pump 7 communicates with the flue 21, the suction port of the first jet pump 7 communicates with the sampling pipeline 3, communicates A third solenoid valve 6 is arranged on the pipelines of the two, and the high-pressure port is connected to a hot compressed air tank 18 through a pipeline, and a fourth solenoid valve 8 is arranged on the pip...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a smoke gas extraction system applied to ammonia escape detection and a smoke gas extraction method. The smoke gas extraction system comprises a smoke gas sampling device, an extraction power device and an anti-blocking device, wherein the smoke gas sampling device comprises a plurality of extraction heads in equal-area matrix distribution in the flue cross sections; the plurality of extraction heads are communicated with a mixed gas mother tank through sampling pipelines; the sampling pipelines are communicated with the mixed gas mother tank and the anti-blocking devicein parallel; a valve is arranged on each sampling pipeline; the extraction power device is connected with the mixed gas mother tank. The ammonia and NOx quantity at an SCR reactor outlet can be accurately detected; the ammonia spraying is realized according to the mole ratio of ammonia to NOx; the excessive ammonia spraying is avoided, so that the ammonium salt crystallization is reduced; the problem of air preheater blockage is solved. A large amount of cleaning and maintenance cost is reduced. The ammonium salt crystallization formation at the catalyst surface and nearby part is avoided; the service life of the catalyst is prolonged. The blockage damage of the whole system can be prevented through the anti-blocking device; the operation reliability and the service life of once commissioning are ensured.

Description

technical field [0001] The invention belongs to the technical field of flue gas treatment, and in particular relates to a flue gas extraction system and a flue gas extraction method applied to ammonia escape detection. Background technique [0002] According to the national environmental protection requirements, coal-fired boilers should implement ultra-low emissions (NO X ≤50mg, SO 2 ≤35mg, dust concentration ≤5mg). At present, the mainstream of coal-fired boilers adopts SCR ammonia denitrification technology, that is, selective catalytic reduction denitrification technology. It means that in the presence of catalyst and oxygen, in the temperature range of 320 ° C ~ 427 ° C, the reducing agent ammonia (anhydrous ammonia, ammonia water or urea pyrolysis) selectively reacts with NOx in the flue gas to form a harmless of nitrogen and water. [0003] There is a very important index in SCR denitrification technology. That is, the amount of ammonia injected is in an appropri...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/24G01N1/26
CPCG01N1/2258G01N1/24G01N1/26
Inventor 高喜峰
Owner 陕西凯特自动化工程有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap