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Exhaust gas treatment device

An exhaust gas treatment device and exhaust gas technology are applied in the direction of combustion product treatment, combustion method, and removal of solid residues, etc., which can solve problems such as pressure loss increase, performance degradation, and popcorn-like ash mixing, and achieve proper capture and damage inhibitory effect

Inactive Publication Date: 2016-07-20
MITSUBISHI POWER LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the above-mentioned pulverized coal-fired boiler, because the furnace is used to burn the pulverized coal as fuel, it will cause popcorn-like ash to be mixed into the exhaust gas.
Since this popcorn-like ash is ash lumps, it especially adheres to the denitrification device installed in the exhaust gas passage, which increases the pressure loss and degrades the performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] figure 1 It is a schematic structural diagram showing a pulverized coal-fired boiler to which the exhaust gas treatment device of Embodiment 1 of the present invention is applied, figure 2 is a schematic side view showing the exhaust gas treatment device of Example 1, image 3 It is a front view of the popcorn-shaped ash collection part in the exhaust gas treatment device of Example 1, Figure 4 It is a plan view of the popcorn-shaped ash collecting part of Example 1, Figure 5 It is a side view of the popcorn-shaped ash collection part of Example 1.

[0040] The pulverized coal boiler to which the exhaust gas treatment device of Example 1 is applied is a boiler that uses pulverized coal as a solid fuel, burns the pulverized coal through a burner, and recovers the heat energy generated by the combustion .

[0041] In this Example 1, as figure 1 As shown, the pulverized coal fired boiler 10 is a traditional boiler with a furnace 11 and a combustion device 12 . The...

Embodiment 2

[0073] Figure 6 It is a plan view of the popcorn-shaped ash collection part in the exhaust gas treatment device of Example 2 of the present invention. Figure 7 It is a side view of the popcorn-shaped ash collection part of Example 2.

[0074] In Example 2, the basic structure of the exhaust gas treatment device is the same as that of Example 1, and only the structure of the popcorn-shaped ash collecting part is different. Such as Figure 6 and Figure 7 As shown, the plurality of protrusions 72a, 72b of the popcorn-shaped ash collecting portion 71 protrude forward in the exhaust gas flow direction, and the plurality of protrusions 72a, 72b are arranged in parallel along two intersecting directions. All of the plurality of protrusions 72a disposed at the central portion of the exhaust pipe have the same shape. In addition, all the plurality of protrusions 72b with respect to the flow direction of the exhaust gas have the same shape. Moreover, since one protrusion part 72...

Embodiment 3

[0083] Figure 8 It is a front view of the popcorn-shaped ash collecting part in the exhaust gas treatment device of Example 3 of the present invention, Figure 9 It is a plan view of the popcorn-shaped ash collecting part of Example 3, Figure 10 It is a side view of the popcorn-shaped ash collection part of Example 3.

[0084] In Example 3, the basic structure of the exhaust gas treatment device is the same as that of Example 1, and only the structure of the popcorn-shaped ash collecting part is different. Such as Figure 8 to Figure 10 As shown, the plurality of protrusions 82 and 83 of the popcorn-shaped ash collection part 81 protrude forward in the exhaust gas flow direction, and the plurality of protrusions 82 and 83 are arranged in parallel along two intersecting directions.

[0085] Although all of the plurality of protrusions 82 and 83 have the same shape, the protrusion 82 and the protrusion 83 are formed in a line-symmetrical shape. That is, since the protrusio...

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Abstract

The exhaust gas treatment device is provided with: an exhaust gas pipe (48) through which it is possible for combustion gases to flow; a heat recovery part furnished to the exhaust gas pipe (48) and capable of recovering heat from the exhaust gases; a harmful substance removal part furnished to the downstream side in the direction of exhaust gas flow from the heat recovery part in the exhaust gas pipe (48), and capable of removing harmful substances in the exhaust gases; and a popcorn ash trapping part (61) furnished between the heat recovery part and the harmful substance removal part in the exhaust gas pipe (48), and capable of trapping popcorn ash in the exhaust gases. In the popcorn ash trapping part (61), a plurality of protruding parts (66) which protrude towards the upstream side in the direction of exhaust gas flow are lined up along two intersecting directions.

Description

technical field [0001] The present invention relates to an exhaust gas treatment device applied to a boiler for generating steam for power generation or factory use. Background technique [0002] For example, a conventional pulverized coal-fired boiler has a hollow furnace installed vertically, and a plurality of burners are arranged circumferentially on the furnace wall and arranged in multiple stages vertically. The burner supplies a mixed gas of pulverized coal (fuel) and primary air, and supplies high-temperature secondary air. The mixed gas and secondary air are blown into the furnace to form a flame. Can burn inside. Secondly, the upper part of the furnace is connected with a flue, and the flue is equipped with a superheater, a reheater, a coal economizer, etc. for recovering the heat energy of the exhaust gas, and heat is carried out between the exhaust gas and water generated by the combustion of the furnace. Exchange, can generate steam. In addition, the flue is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23J3/04
CPCF23J15/022F23J2217/20
Inventor 冈元章泰户高心平小田学坂田展康河越博美
Owner MITSUBISHI POWER LTD
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