An integrated desulfurization, denitrification and dust removal process for a straw pellet boiler

Abstract

Disclosed is a desulfurization, denitration and dedusting integrated straw pellet boiler. According to the desulfurization, denitration and dedusting integrated straw pellet boiler, straw pellets serve as the fuel, carbide slag blended into the straw pellets serves as desulfurizer, and dry-distillated straw serves as denitrator; a straw dry distillation area achieves primary dedusting, tube array heat exchanging condensate water bathing achieves secondary dedusting, and contact between falling film formed by condensate water and smoke reflux achieves tertiary washing and dedusting, so that the effect of desulfurization, denitration and dedusting integration can be achieved. The desulfurization, denitration and dedusting integrated straw pellet boiler has the advantages of integrating desulfurization, denitration and dedusting to obtain a simple structure, to save equipment investment for desulfurization and denitration and the operating costs; achieving dedusting three times on smoke through its own physical flow movement to obtain high dedusting effects and omit manual maintenance; changing washing water into weak aqua ammonia to achieve secondary desulfurization and further to obtain good desulfurization effects.

Description

technical field

[0001] The invention belongs to the field of boilers. The invention relates to an integrated desulfurization, denitrification and dust removal process for a straw pellet boiler. More specifically, straw pellets are used as fuel, calcium carbide mud mixed into the straw pellets is used as a desulfurizer, dry distillation straw is used as a denitrification agent, and straw pellets are used as a denitrification agent. The dry distillation area is used for the first dust removal, the condensed water is washed for the second dust removal, the condensed water forms a falling film, and the countercurrent contact with the flue gas forms the third washing dust removal, so as to achieve the integrated effect of desulfurization, denitrification and dust removal. Background technique

[0002] The straw burned by the straw pellet boiler is biomass, which belongs to renewable energy, and has a good prospect in the vast rural areas of our country. At present, our country v...

Examples

Embodiment 1

[0033] like figure 1 As shown, an integrated desulfurization, denitrification and dust removal process for a straw pellet boiler uses straw pellets as fuel, calcium carbide mud mixed into the straw pellets as a desulfurizer, retort straw as a denitrification agent, and a straw retort area as a dedusting agent. , use the falling film tube heat exchange condensate water to rinse and wash for the second dust removal, and the falling film formed by the condensed water contacts with the flue gas countercurrently to form the third washing dust removal, achieving the effect of desulfurization, denitrification and dust removal integration;

[0034] Its specific steps:

[0035] a. Air preheating

[0036] The air A from the blower is preheated through the ash area 1 at the bottom of the boiler and then enters the combustion chamber 2, and the burnt ash falls into the ash area 1 to preheat the air A;

[0037] b. Straw burning

[0038] The preheated air meets the dry-distilled straw th...

Embodiment 2

[0055] like figure 1 As shown, an integrated desulfurization, denitrification and dust removal process for a straw pellet boiler, its equipment settings and implementation steps are the same as in Example 1, except for the following settings and steps:

[0056]Add 1% (mass fraction) ammonia water from the flushing water pipe until a falling film is formed.

[0057] The effect that can be achieved by applying this technology: the outlet of purified flue gas contains sulfur dioxide ≤ 50ppm, nitrogen oxide ≤ 100ppm, and dust content ≤ 50ppm.

[0058] The beneficial effects of the present invention are: (1) desulfurization, denitrification and dust removal are integrated, the structure is simple, and the desulfurization and denitrification does not increase equipment investment and operating cost; (2) relying on its own logistics movement to perform dust removal on the flue gas three times, the dust removal effect is good, Eliminate manual maintenance; (3) Changing the flushing w...

technical field

[0001] The invention belongs to the field of boilers. The invention relates to an integrated desulfurization, denitrification and dust removal process for a straw pellet boiler. More specifically, straw pellets are used as fuel, calcium carbide mud mixed into the straw pellets is used as a desulfurizer, dry distillation straw is used as a denitrification agent, and straw pellets are used as a denitrification agent. The dry distillation area is used for the first dust removal, the condensed water is washed for the second dust removal, the condensed water forms a falling film, and the countercurrent contact with the flue gas forms the third washing dust removal, so as to achieve the integrated effect of desulfurization, denitrification and dust removal. Background technique

[0002] The straw burned by the straw pellet boiler is biomass, which belongs to renewable energy, and has a good prospect in the vast rural areas of our country. At present, our country v...

Examples

Embodiment 1

[0033] like figure 1 As shown, an integrated desulfurization, denitrification and dust removal process for a straw pellet boiler uses straw pellets as fuel, calcium carbide mud mixed into the straw pellets as a desulfurizer, retort straw as a denitrification agent, and a straw retort area as a dedusting agent. , use the falling film tube heat exchange condensate water to rinse and wash for the second dust removal, and the falling film formed by the condensed water contacts with the flue gas countercurrently to form the third washing dust removal, achieving the effect of desulfurization, denitrification and dust removal integration;

[0034] Its specific steps:

[0035] a. Air preheating

[0036] The air A from the blower is preheated through the ash area 1 at the bottom of the boiler and then enters the combustion chamber 2, and the burnt ash falls into the ash area 1 to preheat the air A;

[0037] b. Straw burning

[0038] The preheated air meets the dry-distilled straw th...

Embodiment 2

[0055] like figure 1 As shown, an integrated desulfurization, denitrification and dust removal process for a straw pellet boiler, its equipment settings and implementation steps are the same as in Example 1, except for the following settings and steps:

[0056]Add 1% (mass fraction) ammonia water from the flushing water pipe until a falling film is formed.

[0057] The effect that can be achieved by applying this technology: the outlet of purified flue gas contains sulfur dioxide ≤ 50ppm, nitrogen oxide ≤ 100ppm, and dust content ≤ 50ppm.

[0058] The beneficial effects of the present invention are: (1) desulfurization, denitrification and dust removal are integrated, the structure is simple, and the desulfurization and denitrification does not increase equipment investment and operating cost; (2) relying on its own logistics movement to perform dust removal on the flue gas three times, the dust removal effect is good, Eliminate manual maintenance; (3) Changing the flushing w...

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