CN110748878A - High-calcium ash back-combustion system - Google Patents
High-calcium ash back-combustion system Download PDFInfo
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- CN110748878A CN110748878A CN201911222916.0A CN201911222916A CN110748878A CN 110748878 A CN110748878 A CN 110748878A CN 201911222916 A CN201911222916 A CN 201911222916A CN 110748878 A CN110748878 A CN 110748878A
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- Prior art keywords
- ash
- calcium
- flashback
- communicated
- boiler
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/02—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed
- F23C10/04—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
- F23C10/24—Devices for removal of material from the bed
- F23C10/26—Devices for removal of material from the bed combined with devices for partial reintroduction of material into the bed, e.g. after separation of agglomerated parts
Abstract
The invention discloses a high-calcium ash back-burning system, which comprises a reaction device and a high-calcium circulating ash dust removal and collection device communicated with the reaction device, wherein the high-calcium circulating ash dust removal and collection device is communicated with a boiler through a back-burning device so that high-calcium ash enters the boiler to be back-burned; the boiler is also communicated with a back-fire collecting device. Therefore, after being collected by the dust collection device, the high-calcium ash after being desulfurized by the semidry method of the circulating fluidized bed is conveyed to the hearth of the circulating fluidized bed boiler for back combustion by the high-calcium ash back combustion device through the back combustion pipeline, the calcium content of the ash after back combustion is greatly reduced, the activity is enhanced, and the comprehensive utilization condition of the ash is completely achieved. The invention can realize the secondary utilization of calcium in the high-calcium ash after the semi-dry desulfurization of the circulating fluidized bed, increase the activity of the ash, realize the comprehensive utilization of 100 percent of ash, reduce the discharge of solid wastes, simultaneously reduce the consumption of the desulfurized calcium powder in the fluidized bed boiler and improve the environmental protection benefit.
Description
Technical Field
The invention relates to the technical field of environmental protection, in particular to a high-calcium ash back-combustion system.
Background
Currently, the protection of ecological environment as the life line and the lowest red line of enterprises faces a serious challenge.
The circulating fluidized bed forms a dense phase bed state through the recycling of materials, an absorbent, an adsorbent and circulating ash in the reaction tower, water is sprayed into the reaction tower, and various pollutants in the flue gas are subjected to chemical reaction or physical adsorption in the reaction tower; the flue gas purified by the reaction tower enters a downstream dust remover to further purify the flue gas, and the SO in the flue gas at the moment2And NOx, almost all SO3HC l, HF, heavy metal Hg and other multi-component pollutants are absorbed and removed, the desulfurization efficiency can reach more than 98%, and the denitration efficiency can reach more than 70%; the technology is mature and stable, the desulfurization and denitrification efficiency is high, no desulfurization waste water exists, the occupied area is small, and the investment and operation cost is low; the method is suitable for flue gas desulfurization, denitration, dust removal and multi-pollutant cooperative control in power station circulating fluidized bed boilers, steel industry and cement industry.
The semi-dry desulfurization, denitrification and dedusting integrated process of the circulating fluidized bed has high reaction speed and high efficiency, and can remove Hg, heavy metals and SO in a synergistic manner3Pollutants such as dioxins; no sewage discharge and no antiseptic treatment, the temperature of the flue gas passing through the semidry method reaction tower process is higher than 75 ℃, the flue gas is dry flue gas, and the flue gas is discharged into the atmosphere through a chimney without white smoke plume "The phenomenon is that the circulating fluidized bed semi-dry method ultralow emission environment-friendly parameter control process is selected more and more in power plants, steel industry, cement industry and the like.
However, ash produced in the operation of the circulating fluidized bed semidry method ultralow emission process has high calcium content and low comprehensive utilization rate, is mostly used for road foundation or ash yard storage, increases the solid waste storage cost, and is easy to cause secondary environmental pollution.
Disclosure of Invention
The invention aims to provide a high-calcium ash backflash system, which can greatly reduce the calcium content of circulating ash, enhance the activity and realize 100 percent comprehensive utilization of ash.
In order to achieve the aim, the invention provides a high-calcium ash backflash system which comprises a reaction device and a high-calcium circulating ash dedusting and collecting device communicated with the reaction device, wherein the high-calcium circulating ash dedusting and collecting device is communicated with a boiler through a backflash device so that high-calcium ash enters the boiler to be backflowed; the boiler is also communicated with a back-fire collecting device.
Preferably, the device further comprises a back-burning conveying adjusting device and a control device connected with the back-burning conveying adjusting device and the back-burning device.
Preferably, the flashback collecting device is also communicated with the reaction device.
Preferably, the back-fire collection device is also communicated with an ash storehouse.
Preferably, the back-burning device comprises a fluidization air chamber connected with a spraying pipe and a feeding valve communicated with the high-calcium circulating ash dust removal and collection device, and the spraying pipe is communicated with the back-burning conveying and adjusting device through an output valve; the fluidization wind chamber is also communicated with a gas inlet valve and a gasification valve of compressed air.
Preferably, the back-burning device is also provided with a balance exhaust valve and a level meter.
The high-calcium ash back-burning system comprises a reaction device and a high-calcium circulating ash dust removal and collection device communicated with the reaction device, wherein the high-calcium circulating ash dust removal and collection device is communicated with a boiler through a back-burning device so that high-calcium ash enters the boiler to be back-burned; the boiler is also communicated with a back-fire collecting device. Therefore, after being collected by the dust collection device, the high-calcium ash after being desulfurized by the semidry method of the circulating fluidized bed is conveyed to the hearth of the circulating fluidized bed boiler for back combustion by the high-calcium ash back combustion device through the back combustion pipeline, the calcium content of the ash after back combustion is greatly reduced, the activity is enhanced, and the comprehensive utilization condition of the ash is completely achieved.
The invention can realize the secondary utilization of calcium in the high-calcium ash after the semi-dry desulfurization of the circulating fluidized bed, increase the activity of the ash, realize the comprehensive utilization of 100 percent of ash, reduce the discharge of solid wastes, simultaneously reduce the consumption of the desulfurized calcium powder in the fluidized bed boiler and improve the environmental protection benefit.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a high calcium ash flashback system provided in an embodiment of the present invention.
Fig. 2 is a schematic structural view of the flashback device in fig. 1.
The reference numerals in fig. 1, 2 are as follows:
1-a reaction device, 2-a high-calcium circulating ash dust removal and collection device, 3-a back-burning device, 4-a back-burning conveying and adjusting device, 5-a boiler, 6-a back-burning collection device, 7-a control device and 8-an ash warehouse;
3.1-feeding valve, 3.2-level meter, 3.3-fluidizing air chamber, 3.4-injecting pipe, 3.5-balance exhaust valve, 3.6-compressed air inlet valve, 3.7-gasification valve and 3.8-output valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in 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, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The core of the invention is to provide a high-calcium ash back-burning system, which can greatly reduce the calcium content of the circulating ash, enhance the activity and realize 100 percent comprehensive utilization of ash.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a high calcium ash flashback system according to an embodiment of the present invention.
In a specific embodiment, the high-calcium ash back-burning system provided by the invention comprises a reaction device 1 and a high-calcium circulating ash dedusting and collecting device 2 communicated with the reaction device, wherein the high-calcium circulating ash dedusting and collecting device 2 is communicated with a boiler 5 through a back-burning device 3, so that high-calcium ash enters the boiler 5 for back burning; the boiler 5 is also communicated with a back-fire collecting device 6.
The high calcium ash conveying flow can be adjusted through the back combustion conveying adjusting device 4 according to the set program sent by the program control device 7 according to the boiler combustion parameters, obviously, the program control device 7 is in signal connection with the back combustion conveying adjusting device 4 and the back combustion device 3.
The flashback-collection device 6 can also communicate with the reaction device 1 to optimize further system configurations.
The back-burning collecting device 6 is also communicated with an ash storehouse 8 so as to facilitate the transfer of ash.
Referring to fig. 2, fig. 2 is a schematic structural diagram of the flashback device in fig. 1.
The back-burning device 3 is provided with a feed valve 3.1 communicated with the high-calcium circulating ash dust-removing and collecting device 2 and a balance exhaust valve 3.5; a fluidizing air chamber 3.3 of the back-burning device 3 is provided with a spraying material pipe 3.4, and the spraying material pipe 3.4 is communicated with a back-burning conveying adjusting device 4 through an output valve 3.8; a material level meter 3.2 can be arranged in the device body, and the fluidization air chamber 3.3 is also communicated with an air inlet valve 3.6 of compressed air and a gasification valve 3.7.
During operation, the program control device 7 is controlled by the electromagnetic valve box, firstly the balance exhaust valve 3.5 is opened, then the feeding valve 3.1 is opened, and at the moment, materials on the upper part of the feeding hole are added from the feeding hole. The material is controlled in accordance with the program design, for example, by the feed time and also by the level gauge 3.2.
The program control device 7 controls according to program setting, closes the feed valve 3.1 and the balance exhaust valve 3.5, opens the output valve 3.8, simultaneously, the gasification valve 3.7 and the air inlet valve 3.6 are opened, compressed air is divided into two paths to enter the body of the back combustion device 3, provides internal pressurization, fluidization and conveying air sources for the device, fully fluidizes the material through the gasification device, and blows out the fluidized material through the injection pipe 3.4.
When the material is conveyed, the resistance in the pipeline is greatly reduced, the pressure is low, and the program control automatically closes the compressed air inlet valve 3.6, so that the second working cycle is started. The program control device can be generally provided with two working modes of automation and manual operation for field operation.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The high calcium ash flashback system provided by the present invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (6)
1. The high-calcium ash back-burning system is characterized by comprising a reaction device (1) and a high-calcium circulating ash dust removal and collection device (2) communicated with the reaction device, wherein the high-calcium circulating ash dust removal and collection device (2) is communicated with a boiler (5) through a back-burning device (3) so that high-calcium ash enters the boiler (5) for back burning; the boiler (5) is also communicated with a back-fire collecting device (6).
2. High calcium ash flashback system according to claim 1, further comprising a flashback-conveying regulating device (4) and a control device (7) connected to both the flashback-conveying regulating device (4) and the flashback device (3).
3. High calcium ash flashback system as set forth in claim 2, wherein said flashback collection means (6) is also in communication with said reaction means (1).
4. High calcium ash flashback system, according to claim 3, characterized in that the flashback collecting device (6) is also in communication with an ash silo (8).
5. The high calcium ash flashback system of any one of claims 1 through 4,
the flashback device (3) comprises a fluidization air chamber (3.3) connected with an injection pipe (3.4) and a feed valve (3.1) communicated with the high-calcium circulating ash dedusting and collecting device (2), and the injection pipe (3.4) is communicated with the flashback conveying and adjusting device (4) through an output valve (3.8); the fluidization wind chamber (3.3) is also communicated with an air inlet valve (3.6) of compressed air and a gasification valve (3.7).
6. The high calcium ash flashback system as defined in claim 5, characterized in that the flashback device (3) is further provided with a balancing exhaust valve (3.5) and a level indicator (3.2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911222916.0A CN110748878A (en) | 2019-12-03 | 2019-12-03 | High-calcium ash back-combustion system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911222916.0A CN110748878A (en) | 2019-12-03 | 2019-12-03 | High-calcium ash back-combustion system |
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| CN110748878A true CN110748878A (en) | 2020-02-04 |
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| CN201911222916.0A Pending CN110748878A (en) | 2019-12-03 | 2019-12-03 | High-calcium ash back-combustion system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU200504U1 (en) * | 2020-04-01 | 2020-10-27 | Общество с ограниченной ответственностью "БАРНАУЛЬСКИЙ ЭНЕРГОМАШИНОСТРОИТЕЛЬНЫЙ ЗАВОД" | Device for returning ash and unburned particles to the boiler furnace |
-
2019
- 2019-12-03 CN CN201911222916.0A patent/CN110748878A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU200504U1 (en) * | 2020-04-01 | 2020-10-27 | Общество с ограниченной ответственностью "БАРНАУЛЬСКИЙ ЭНЕРГОМАШИНОСТРОИТЕЛЬНЫЙ ЗАВОД" | Device for returning ash and unburned particles to the boiler furnace |
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