Flue gas desulfurization process for small-sized heating or short-running-cycle boiler
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A technology of boiler flue gas and desulfurization process, which is applied in the field of desulfurization and can solve problems such as desulfurization
Inactive Publication Date: 2011-07-13
SHANXI GERUI ENVIRONMENTAL PROTECTION EQUIP
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[0003] In order to solve the technical problem of boiler coal desulfurization, the present invention provides a flue gas desulfurization process for small-scale heating or short-period operation boilers
Method used
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Embodiment 1
[0023] like figure 1 As shown, taking a 10T boiler as an example, according to the coal consumption of the boiler and the sulfur content in the coal, limestone powder is mixed into the coal and added to the boiler furnace 1 together, and the ratio of calcium to sulfur is 1.3. In furnace 1, sulfur dioxide produced by coal combustion reacts with limestone powder to complete about 80% desulfurization process. The solids generated by the reaction are washed together with the slag into the desulfurization sedimentation tank 4; the remaining 20% sulfur dioxide enters the desulfurization tower 2 along with the flue gas. In the desulfurization sedimentation tank 4, the precipitated slag and the solids produced by the reaction are regularly cleaned out manually or mechanically, and the slurry containing lime in the upper part is pumped into the desulfurization tower 2 through the desulfurization circulating pump 5, and contacts with the flue gas flowing upstream from the lower part ...
Embodiment 2
[0027] Taking a 20T boiler as an example, according to the coal consumption of the boiler and the sulfur content in the coal, limestone powder is mixed into the coal and added to the furnace 1 of the boiler together, and the ratio of calcium to sulfur is 1.4. All the other process operations are the same as embodiment 1, and its detection effect is as follows:
[0028] When directly discharged, the sulfur content at the chimney inlet flue is 2350mg / Nm 2 , after desulfurization:
[0029] Detection position
[0030] The desulfurization efficiency reaches 91%.
Embodiment 3
[0032] Taking a 20T boiler as an example, according to the coal consumption of the boiler and the sulfur content in the coal, limestone powder is mixed into the coal and added to the furnace 1 of the boiler together, and the ratio of calcium to sulfur is 1.4. All the other process operations are the same as embodiment 1, and its detection effect is as follows:
[0033] When directly discharged, the sulfur content at the chimney inlet flue is 2410mg / Nm 2 , after desulfurization:
[0034] Detection position
[0035] The desulfurization rate is 90%.
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Abstract
The invention relates to a desulfurization technology, in particular to a flue gas desulfurization process for a small-sized heating or short-running-cycle boiler, wherein the process provided by the invention is used for realizing desulfurization of a coal-fired boiler. In the method, limestone powder and coal are mixed and then added in a hearth, wherein the quantity rate of calcium to sulfur is 1.3-1.5; the sulfur dioxide generated by coal burning and the limestone powder are subjected to chemical reaction in the hearth so as to complete the main desulfurization process, the solid generated by reaction and slag are flushed to a desulfurization sedimentation basin together; the sulfur dioxide generated by residue sulfur elements enters a desulfurizing tower along with the flue gas; and the precipitated slag is cleared in the desulfurization sedimentation basin, the slurry containing lime at the upper part of the desulfurization sedimentation basin is fed into the desulfurizing tower by a desulfurization circulating pump and is in contact with the flue gas upstream from the lower part of the desulfurization sedimentation basin to be subjected to the desulfurization reaction again, the slurry after reaction falls in the bottom of the tower and overflows to a flushing tank through an overflow port, and finally the total sulfur elements are completely removed and collected.
Description
technical field [0001] The invention relates to a desulfurization technology, in particular to a flue gas desulfurization technology applied to small-scale heating or short-period operation boilers. Background technique [0002] Boilers are the most commonly used equipment for heating and boiling water in northern my country. The pollution caused by burning coal in boilers is very serious, especially the sulfur contained in coal must be effectively removed to reduce air pollution, especially for small heating boilers or short-cycle operation. Boilers (small heating or short-cycle operation boilers refer to heating and school water supply boilers with less than 20T and uninterrupted operation time of less than half a year). And the desulfurization treatment of the reaction, such as the use of alkaline desulfurization liquid to scrub the flue gas. The application number is 200810246127.6, which discloses a boiler desulfurization method. The idea is to combust calcium carbonate ...
Claims
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