CN1073507A - A kind of pulverized-coal fired boiler desulfurizing combustion that is used for - Google Patents
A kind of pulverized-coal fired boiler desulfurizing combustion that is used for Download PDFInfo
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- CN1073507A CN1073507A CN 91111618 CN91111618A CN1073507A CN 1073507 A CN1073507 A CN 1073507A CN 91111618 CN91111618 CN 91111618 CN 91111618 A CN91111618 A CN 91111618A CN 1073507 A CN1073507 A CN 1073507A
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- combustion
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- desulfurizing
- coal
- boiler
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Abstract
A kind of method that is used for the pulverized-coal fired boiler desulfurizing combustion, it is the sulphur principle of utilizing in the coal that explains of preferential oxidation branch at high temperature, make coal dust at first in a preposition burner, carry out combustion with meagre oxygen, the combustion gas that the burning back generates enters with the residue carbon granule that does not burn carries out desulphurization reaction in the gas solid reactor that desulfurizing agent is housed, directly send into boiler furnace then and carry out completing combustion.The present invention compared with prior art under investment and the lower situation of operating cost, has characteristics such as desulfuration efficiency height and sorbent utilization height, and can reduce NO effectively
xGeneration, be particularly suitable for building the transformation of boiler.
Description
The present invention relates to a kind of method that pulverized-coal fired boiler equipment carries out desulfurizing combustion that is used for, particularly relate to the method that a kind of boiler plant that uses the high-sulfur coal dust carries out desulfurizing combustion.
At present, in view of SO
2The all strict control SO of the seriousness that gaseous contamination caused, countries in the world
2The gas purging amount.In the prior art, control coal combustion discharging SO
2Method mainly contain following two kinds: the one, flue gas desulfurization promptly is provided with a smoke eliminator at back-end ductwork, this method desulfurization degree is higher, be at present effective method, but equipment investment is too big, the operating cost height is not suitable for building the transformation of boiler simultaneously.The 2nd, desulfurization in the stove internal combustion comprises fluidized bed combustion and in-furnace calcium spraying technology.Fluidized bed combustion desulfurization degree height has been obtained very big success to miniature boiler, but also there are many problems in large scale development, and investment and operating cost are also higher simultaneously, are difficult to be used for building the transformation of boiler.The in-furnace calcium spraying technology, investment cost is low, is very suitable for building the transformation of boiler, but desulfurization degree and calcium utilization are very low.
The objective of the invention is deficiency and defective, propose a kind of new method that is used for pulverized-coal fired boiler equipment desulfurizing combustion at the prior art existence.This method not only has the higher desulfuration efficiency and the calcium utilization of desulfurizing agent, and can reduce the generation of NOx effectively under investment and all lower situation of operating cost, can be suitable for having built the transformation of boiler.
The object of the present invention is achieved like this: coal dust at first carries out combustion with meagre oxygen in a preposition burner, the combustion gas that the burning back generates enters with the residue carbon granule that does not burn carries out desulphurization reaction in the gas solid reactor that desulfurizing agent is housed, directly send into boiler furnace then and carry out completing combustion.
Adopting the process of above this pulverized-coal fired boiler desulfurizing combustion, is the principle of having utilized the preferential oxidation decomposition at high temperature of the sulphur in the coal to discharge.This is that this sulfur is called inorganic sulfur because in most of coal, pyrite is main sulfur-bearing composition, and it is a kind of very unsettled material, and very easily decomposing oxidation can just begin oxidizing fire under 350 ℃～400 ℃ conditions, discharges sulfur.Also having a kind of sulfur is organic sulfur, this sulfur can be under hot environment with the fugitive constituent in the coal in large quantities pyrolysis discharge.Therefore, the effect of preposition burner is with the least possible air capacity and time, sulphur in the coal dust is discharged, the combustion gas that burning generates is being carried the residue carbon granule that does not burn and is being entered the gas solid reactor that desulfurizing agent is housed, remove the sulfur-bearing component in the combustion gas, and then send into boiler furnace, add sufficient air and carry out completing combustion.
The present invention compared with prior art owing to be provided with preposition burner, makes it can be with less air amount and the time of extremely lacking, sulphur in the coal is farthest discharged, in gas solid reactor, carry out desulphurization reaction then, therefore have desulfuration efficiency height, the characteristics that sorbent utilization is high; , only be about 4% of whole boiler size, so investment cost is lower simultaneously, is particularly suitable for building the transformation of boiler because that the size of preposition burner and gas solid reactor can design is very little.Another advantage of the present invention is: because preposition burner is a High Temperature Air Combustion, the nitrogen component in the coal dust also can discharge in a large number, changes into nitrogen, thereby has controlled the generation of NOx, makes it have the advantage that low NOx generates.
Accompanying drawing 1 is a schematic flow sheet of the present invention.
Coal dust at first in a preposition burner [1], carries out combustion with meagre oxygen with air in certain amount.Because the organic sulfur in the coal discharges in a large amount of pyrolysis of beginning more than 800 ℃, thereby the maximum temperature in the preposition burner [1] must be greater than 800 ℃.Result of the test shows, the release rate of sulphur in preposition burner is relevant with an air capacity of sending with coal, but for general coal, for example bituminous coal and anthracite, theoretical air requirement with 40%, maximum temperature reaches 1300 ℃, stops in preposition burner 0.5 second, and the sulfur in the coal dust is just had an appointment and 80% is released.Gases that these burning backs generate carry the carbon granule that does not burn and enter gas solid reactor [2] together, carry out desulphurization reaction with the desulfurizing agent of the inside, and combustion gas after the desulfurization and coal dust are directly sent into boiler furnace [3], add sufficient air again and carry out completing combustion.In gas solid reactor [2], its desulfurization gas-solid reactive mode adopts fluid bed gas-solid reaction mode.Desulfurizing agent is the material based on calcium, also can directly form with the limestone mine fragmentation.Because the best desulfurization reaction temperature of calcium-based desulfurizing agent is 800 ℃～900 ℃, therefore require to enter the combustion gas in the gas solid reactor [2] and the temperature of the residue carbon granule that do not burn should be controlled between 700 ℃ to 1000 ℃.The average diameter of sorbent particle should can increase the time of staying of desulfurizing agent in reactor [2] like this greater than the diameter of pulverized coal particle.In addition because the burning in the preposition burner is a combustion with meagre oxygen, thereby contain a large amount of reproducibility components in the combustion gas of burning generation, the CaS material that generates under high-temperature reductibility gas part also can not stop up the hole of sorbent particle, so the utilization rate of desulfurizing agent can improve greatly.General desulfuration efficiency can reach 90%, and the utilization rate of desulfurizing agent can reach more than 70%.
Claims (4)
1, a kind of method that is used for pulverized-coal fired boiler equipment desulfurizing combustion, it is characterized in that coal dust at first carries out combustion with meagre oxygen in preposition burner [1], the combustion gas that the burning back generates is carried out desulphurization reaction in the residue carbon granule that does not burn enters the gas solid reactor [2] that desulfurizing agent is housed, directly send into boiler furnace [3] then and carry out completing combustion.
2,, it is characterized in that the maximum temperature in the preposition burner should be greater than 800 ℃ according to the described desulfurizing combustion of claim 1.
3, according to the described desulfurizing combustion of claim 1, the temperature of the residue carbon granule that it is characterized in that entering the combustion gas of gas solid reactor [2] and do not burn should be controlled between 700 ℃～1000 ℃, and entering the desulfurization gas-solid reactive mode of being carried out in the gas solid reactor is fluid bed gas-solid reaction mode.
4,, it is characterized in that the desulfurizing agent of being adorned in the gas solid reactor [2] is the material based on calcium according to the method for claim 1 or 3 described desulfurizing combustions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91111618 CN1073507A (en) | 1991-12-19 | 1991-12-19 | A kind of pulverized-coal fired boiler desulfurizing combustion that is used for |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91111618 CN1073507A (en) | 1991-12-19 | 1991-12-19 | A kind of pulverized-coal fired boiler desulfurizing combustion that is used for |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1073507A true CN1073507A (en) | 1993-06-23 |
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ID=4910743
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91111618 Pending CN1073507A (en) | 1991-12-19 | 1991-12-19 | A kind of pulverized-coal fired boiler desulfurizing combustion that is used for |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1073507A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100396992C (en) * | 2002-09-19 | 2008-06-25 | 李耀中 | Desulfurizing technique for clean combustion |
| CN106196011A (en) * | 2016-06-29 | 2016-12-07 | 无锡锡能锅炉有限公司 | A kind of desulfurizing combustion of coal-burning boiler |
-
1991
- 1991-12-19 CN CN 91111618 patent/CN1073507A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100396992C (en) * | 2002-09-19 | 2008-06-25 | 李耀中 | Desulfurizing technique for clean combustion |
| CN106196011A (en) * | 2016-06-29 | 2016-12-07 | 无锡锡能锅炉有限公司 | A kind of desulfurizing combustion of coal-burning boiler |
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |