CN210385466U - Inside and outside desulfurization system of circulating fluidized bed boiler stove - Google Patents
Inside and outside desulfurization system of circulating fluidized bed boiler stove Download PDFInfo
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- CN210385466U CN210385466U CN201921049401.0U CN201921049401U CN210385466U CN 210385466 U CN210385466 U CN 210385466U CN 201921049401 U CN201921049401 U CN 201921049401U CN 210385466 U CN210385466 U CN 210385466U
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Abstract
The utility model discloses a desulfurization system outside stove in circulating fluidized bed boiler furnace belongs to circulating fluidized bed boiler desulfurization technical field, including circulating fluidized bed boiler, circulating fluidized bed boiler's entry intercommunication has interior desulfurization system of stove, and circulating fluidized bed boiler's export intercommunication has outer desulfurization system of stove. The utility model discloses synthesize and adopt desulfurization in the stove and desulfurization process outside the stove, the boiler is with coal and desulfurated operation elasticity big, the water economy resource, flue gas denitration is with low costs.
Description
Technical Field
The utility model relates to a circulating fluidized bed boiler desulfurization technical field, concretely relates to outer desulfurization system of stove in circulating fluidized bed boiler stove.
Background
In chemical production, water vapor is prepared by a common boiler, coal and oxygen react to generate carbon dioxide and release heat in the combustion process of the boiler, and sulfur dioxide is one of main pollutants in the atmosphere because the coal also contains sulfur element and can generate carbon dioxide and sulfur dioxide simultaneously in the combustion process, so that the sulfur dioxide in the flue gas of the boiler needs to be removed.
The existing boiler flue gas desulfurization technologies mainly comprise limestone-gypsum method flue gas desulfurization technology, ammonium phosphate fertilizer method flue gas desulfurization technology, flue gas circulating fluidized bed desulfurization technology, ammonia water washing method desulfurization technology and the like, and have the characteristics of two types of in-furnace desulfurization and out-of-furnace desulfurization in a general way.
In the traditional in-furnace desulfurization, calcium carbonate powder is generally added from one side of a coal dropping pipe of a boiler coal feeder, the amount of the added calcium carbonate powder is not suitable to be controlled, and the dosage of the calcium carbonate powder is large, so that the desulfurization cost is high; the traditional external desulfurization mostly adopts calcium hydroxide after quicklime digestion as a desulfurizer, so that the problems of pipeline blockage and large water consumption at one time easily occur, and the defect of high desulfurization cost is caused.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects in the prior art, the utility model provides an internal and external desulfurization system of a circulating fluidized bed boiler; the internal and external desulfurization system of the circulating fluidized bed boiler comprehensively adopts the internal desulfurization and external desulfurization processes, has high operation flexibility of coal consumption and desulfurization of the boiler, saves water resources and has low flue gas denitration cost.
In order to solve the technical problem, the utility model provides a pair of desulfurization system outside stove in circulating fluidized bed boiler stove, including circulating fluidized bed boiler, circulating fluidized bed boiler's entry intercommunication has interior desulfurization system of stove, and circulating fluidized bed boiler's export intercommunication has outer desulfurization system of stove.
In the further improvement of the utility model, the in-furnace desulfurization system comprises a Roots blower, a desulfurizer bin and a secondary air pipe which are sequentially communicated; and the lower air inlet of the secondary air pipe is communicated with the inlet of the circulating fluidized bed boiler.
Through the design, this scheme is when using, and the roots fan can blow in the desulfurizer storehouse in the overgrate air pipe, blows in circulating fluidized bed boiler promptly, and the chooseing for use of desulfurizer, the user select suitable desulfurizer on the market by oneself according to self economic requirement can, when secondly selecting the desulfurizer, should notice the desulfurizer and select for use the type of taking off that is suitable for circulating fluidized bed boiler inside and desulfurization outside the stove simultaneously.
In the further improvement of the utility model, the external desulfurization system comprises an electrostatic dust collector, a desulfurization tower, a low-resistance separator, a bag-type dust collector, a draught fan, a chimney and factory compressed air; the electrostatic dust collector, the desulfurizing tower, the low-resistance separator, the bag-type dust collector, the induced draft fan and the chimney are communicated in sequence; the factory compressed air is respectively communicated with the electrostatic dust collector, the desulfurizing tower and the bag-type dust collector through air pipes; the inlet of the electrostatic dust collector is communicated with the outlet of the circulating fluidized bed boiler; the desulfurizing tower is communicated with a desulfurizing agent bin.
Through the design, the boiler flue gas discharged by the circulating fluidized bed boiler is discharged into the atmosphere after passing through the electrostatic dust collector, the desulfurizing tower, the low-resistance separator, the bag-type dust collector, the draught fan and the chimney, wherein the factory compressed air can blow waste materials generated in the electrostatic dust collector, the desulfurizing tower and the bag-type dust collector into the coarse slag ash bin, the desulfurizing agent ash bin and the desulfurizing agent ash bin respectively.
Secondly, the design also well reflects the process technology adopted by the external desulfurization in the scheme, namely the dust removal and desulfurization integrated process technology, so that the desulfurization and dust removal are more thorough.
The utility model discloses in the further improvement, above-mentioned electrostatic precipitator intercommunication has thick sediment ash storehouse, and thick sediment ash storehouse intercommunication has strong brine I.
Through the above design, the assurance dust removal work that the electrostatic precipitator of this scheme can be better, wherein strong brine I can play the purpose of humidification dust fall, saving water once, and during the outward transport waste material of coarse sediment ash storehouse, strong brine sprays through setting up the high-pressure backward flow atomizing nozzle on coarse sediment ash storehouse.
The utility model discloses in the further improvement, above-mentioned desulfurizing tower communicates respectively has strong brine II and desulfurizer ash storehouse.
Through above-mentioned design, the assurance desulfurization work that the desulfurizing tower of this scheme can be better, wherein strong brine II can play the purpose of maintaining the interior best desulfurization temperature of desulfurizing tower, and during the use, the strong brine sprays through setting up the high pressure backward flow atomizing nozzle in the desulfurizing tower inside.
The utility model discloses in the further improvement, above-mentioned low resistance separator intercommunication has the gasification groove, and gasification groove and desulfurizing tower intercommunication.
Through the design, the desulfurizer can be better saved, and when the desulfurizer is used, the large-particle desulfurizer obtained by separation of the low-resistance separator can be returned to the desulfurizing tower through the gasification tank to be recycled.
The utility model discloses in the further improvement, above-mentioned sack cleaner intercommunication has desulfurizer ash storehouse, desulfurizer ash storehouse and desulfurizer ash storehouse intercommunication, and desulfurizer ash storehouse intercommunication has strong brine III.
Through the design, the guarantee dust removal work that the sack cleaner of this scheme can be better, wherein strong brine III can play the purpose of humidification dust fall, saving water once, and when the waste material in the desulfurizer ash storehouse was outward transported, the strong brine sprayed through the high pressure backward flow atomizing nozzle that sets up on the desulfurizer ash storehouse.
A desulfurization method of a desulfurization system inside and outside a furnace of a circulating fluidized bed boiler, comprising the steps of:
(1) blowing the desulfurizer in the desulfurizer bin into a lower air port of a secondary air pipe by a Roots blower, and enabling the desulfurizer to enter the circulating fluidized bed boiler through the lower air port of the secondary air pipe, wherein the calcium-sulfur ratio is controlled within 2-3;
(2) boiler flue gas of a circulating fluidized bed boiler enters a desulfurizing tower through an electrostatic dust collector, wherein dust separated by the electrostatic dust collector is blown into a coarse slag ash bin by factory compressed air, strong brine is sprayed when the coarse slag ash bin is transported outside, and strong brine particles are sprayed by a high-pressure backflow atomizing nozzle;
(3) blowing the desulfurizer in the desulfurizer bin into the desulfurizing tower by the Roots blower, and spraying strong brine in the desulfurizing tower by using a high-pressure backflow atomizing nozzle to maintain the optimal desulfurization temperature in the tower to be 70 ℃, wherein the invalid desulfurizer used in the desulfurizing tower is discharged into a desulfurizer ash bin by using factory compressed air, the strong brine is sprayed when the desulfurizer ash bin is transported outside, and strong brine particles are sprayed by using the high-pressure backflow atomizing nozzle;
(4) the boiler flue gas enters a low-resistance separator from an outlet at the upper part of the desulfurization tower, wherein the large-particle desulfurizer obtained by separation of the low-resistance separator enters a gasification tank and returns to the desulfurization tower for recycling, and the small-particle desulfurizer enters the next procedure along with the boiler flue gas;
(5) boiler flue gas from the low-resistance separator enters a bag-type dust remover, wherein small-particle desulfurizer carried by the boiler flue gas is filtered by the bag-type dust remover, and then is blown into a desulfurizer ash bin by factory compressed air, and finally is conveyed into a desulfurizer ash bin, strong brine is sprayed when the desulfurizer ash bin is transported outside, and strong brine particles are sprayed by a high-pressure backflow atomizing nozzle;
(6) and discharging the qualified boiler flue gas filtered by the bag-type dust collector into a chimney through a draught fan, and finally, introducing into the atmosphere.
Through detection, by the design, the sulfur dioxide emission concentration is 68mg/m3, and the emission standard is achieved.
In the further improvement of the utility model, the calcium-sulfur ratio is 2.5.
The utility model discloses in the further improvement, above-mentioned desulfurizer particle size range is 0.2 ~ 1.5mm, and wherein 200 ~ 500 mu m account for 60-80%, and calcium hydroxide content is more than 80%, and the optimum point scope of boiler bed temperature is 850 ~ 950 ℃.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model discloses a desulfurization and desulfurization technique outside the stove in the stove, the boiler coal and the desulfurization operation elasticity are big, the water economy resource, and flue gas denitration is with low costs.
Drawings
To more clearly illustrate the background art or the technical solution of the present invention, the drawings used in conjunction with the prior art or the detailed description are briefly described below; obviously, the structure, proportion, size, etc. shown in the drawings are only used for matching with the content disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, so that the present invention has no technical essential meaning, and any modification of the structure, change of the proportion relation or adjustment of the size should still fall within the scope covered by the technical content disclosed in the present invention without affecting the function and the achievable purpose of the present invention.
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the present invention will be described in detail below with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work based on the embodiments of the present invention shall fall within the protection scope of the present invention, and meanwhile, the terms such as "upper", "lower", "front", "rear", "middle", etc. cited in the present specification shall be understood only for convenience of description, and are not intended to limit the scope of the present invention which can be implemented, and the relative relationship changes or adjustments thereof, without substantial changes in technical content, the scope of the present invention should also be considered as the following implementable claims.
As shown in figure 1, the internal and external desulfurization systems of the circulating fluidized bed boiler comprise a circulating fluidized bed boiler, wherein the inlet of the circulating fluidized bed boiler is communicated with the internal desulfurization system, and the outlet of the circulating fluidized bed boiler is communicated with the external desulfurization system.
The in-furnace desulfurization system comprises a Roots blower, a desulfurizer bin and a secondary air pipe which are sequentially communicated; and the lower air inlet of the secondary air pipe is communicated with the inlet of the circulating fluidized bed boiler.
The external desulfurization system comprises an electrostatic dust collector, a desulfurization tower, a low-resistance separator, a bag-type dust collector, a draught fan, a chimney and factory compressed air; the electrostatic dust collector, the desulfurizing tower, the low-resistance separator, the bag-type dust collector, the induced draft fan and the chimney are communicated in sequence; the factory compressed air is respectively communicated with the electrostatic dust collector, the desulfurizing tower and the bag-type dust collector through air pipes; the inlet of the electrostatic dust collector is communicated with the outlet of the circulating fluidized bed boiler; the desulfurizing tower is communicated with a desulfurizing agent bin.
The electrostatic dust collector is communicated with a coarse slag ash bin, and the coarse slag ash bin is communicated with a strong brine I.
The desulfurizing tower is respectively communicated with a strong brine II and a desulfurizing agent ash storehouse.
The low-resistance separator is communicated with a gasification tank, and the gasification tank is communicated with the desulfurizing tower.
The bag-type dust remover is communicated with a desulfurizer ash bin, the desulfurizer ash bin is communicated with a desulfurizer ash bin, and the desulfurizer ash bin is communicated with strong brine III.
A desulfurization method of a desulfurization system inside and outside a furnace of a circulating fluidized bed boiler, comprising the steps of:
(1) blowing the desulfurizer in the desulfurizer bin into a lower air port of a secondary air pipe by a Roots blower, and enabling the desulfurizer to enter the circulating fluidized bed boiler through the lower air port of the secondary air pipe, wherein the calcium-sulfur ratio is controlled within 2-3;
(2) boiler flue gas of the circulating fluidized bed boiler enters a desulfurizing tower through an electrostatic dust collector, wherein dust separated by the electrostatic dust collector is blown into a coarse slag ash storehouse through factory compressed air, and strong brine is sprayed when the coarse slag ash storehouse is transported outside;
(3) blowing the desulfurizer in the desulfurizer bin into the desulfurizing tower by the Roots blower, and spraying strong brine in the desulfurizing tower by using a high-pressure backflow atomizing nozzle to maintain the optimal desulfurizing temperature in the tower to be 70 ℃, wherein the invalid desulfurizer used in the desulfurizing tower is discharged into a desulfurizer ash bin by using factory compressed air, and spraying the strong brine when the desulfurizer ash bin is transported outside;
(4) the boiler flue gas enters a low-resistance separator from an outlet at the upper part of the desulfurization tower, wherein the large-particle desulfurizer obtained by separation of the low-resistance separator enters a gasification tank and returns to the desulfurization tower for recycling, and the small-particle desulfurizer enters the next procedure along with the boiler flue gas;
(5) boiler flue gas from the low-resistance separator enters a bag-type dust collector, wherein small-particle desulfurizer carried by the boiler flue gas is filtered by the bag-type dust collector, and then is blown into a desulfurizer ash bin by factory compressed air, and finally is conveyed into a desulfurizer ash bin, and strong brine is sprayed when the desulfurizer ash bin is transported outside;
(6) and discharging the qualified boiler flue gas filtered by the bag-type dust collector into a chimney through a draught fan, and finally, introducing into the atmosphere.
The calcium to sulfur ratio was 2.5.
The particle size range of the desulfurizer is 0.2-1.5 mm, wherein the particle size range of 200-500 mu m accounts for 60-80%, the content of calcium hydroxide is more than 80%, and the optimal range of the bed temperature of the boiler is 850-950 ℃.
When the scheme is operated, the desulfurization in the furnace is preferably controlled to be 1/2-3/4, and the aim is to remove a part of the sulfur in the furnace first, so that the load of the sulfur removal can be better lightened.
The sulfur dioxide emission concentration in this example was tested to be 68mg/m 3.
Although the present invention has been described in detail by referring to the drawings in conjunction with the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and substance of the present invention, and these modifications or substitutions are intended to be within the scope of the present invention/any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. The utility model provides a desulfurization system outside stove in circulating fluidized bed boiler stove which includes circulating fluidized bed boiler, its characterized in that: the inlet of the circulating fluidized bed boiler is communicated with an in-furnace desulfurization system, and the outlet of the circulating fluidized bed boiler is communicated with an out-furnace desulfurization system.
2. The inside and outside furnace desulfurization system of a circulating fluidized bed boiler according to claim 1, characterized in that: the in-furnace desulfurization system comprises a Roots blower, a desulfurizer bin and a secondary air pipe which are sequentially communicated; and the lower air inlet of the secondary air pipe is communicated with the inlet of the circulating fluidized bed boiler.
3. The inside and outside furnace desulfurization system of the circulating fluidized bed boiler according to claim 2, characterized in that: the external desulfurization system comprises an electrostatic dust collector, a desulfurization tower, a low-resistance separator, a bag-type dust collector, a draught fan, a chimney and factory compressed air; the electrostatic dust collector, the desulfurizing tower, the low-resistance separator, the bag-type dust collector, the induced draft fan and the chimney are communicated in sequence; the factory compressed air is respectively communicated with the electrostatic dust collector, the desulfurizing tower and the bag-type dust collector through air pipes; the inlet of the electrostatic dust collector is communicated with the outlet of the circulating fluidized bed boiler; the desulfurizing tower is communicated with a desulfurizing agent bin.
4. The inside and outside furnace desulfurization system of a circulating fluidized bed boiler according to claim 3, characterized in that: the electrostatic dust collector is communicated with a coarse slag ash bin, and the coarse slag ash bin is communicated with a strong brine I.
5. The inside and outside furnace desulfurization system of a circulating fluidized bed boiler according to claim 3, characterized in that: the desulfurizing tower is respectively communicated with a strong brine II and a desulfurizing agent ash storehouse.
6. The inside and outside furnace desulfurization system of a circulating fluidized bed boiler according to claim 3, characterized in that: the low-resistance separator is communicated with a gasification tank, and the gasification tank is communicated with the desulfurizing tower.
7. The inside and outside furnace desulfurization system of a circulating fluidized bed boiler according to claim 3, characterized in that: the bag-type dust remover is communicated with a desulfurizer ash bin, the desulfurizer ash bin is communicated with a desulfurizer ash bin, and the desulfurizer ash bin is communicated with strong brine III.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110215828A (en) * | 2019-07-04 | 2019-09-10 | 久泰能源(准格尔)有限公司 | External desulfurzation system and sulfur method in a kind of circulating fluid bed boiler |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110215828A (en) * | 2019-07-04 | 2019-09-10 | 久泰能源(准格尔)有限公司 | External desulfurzation system and sulfur method in a kind of circulating fluid bed boiler |
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