CN116734268A - Device system and method for mixing and burning wet sludge of circulating fluidized bed boiler - Google Patents
Device system and method for mixing and burning wet sludge of circulating fluidized bed boiler Download PDFInfo
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- CN116734268A CN116734268A CN202310763212.4A CN202310763212A CN116734268A CN 116734268 A CN116734268 A CN 116734268A CN 202310763212 A CN202310763212 A CN 202310763212A CN 116734268 A CN116734268 A CN 116734268A
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- 239000010802 sludge Substances 0.000 title claims abstract description 168
- 238000002156 mixing Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000000463 material Substances 0.000 claims abstract description 46
- 238000000926 separation method Methods 0.000 claims abstract description 43
- 238000001035 drying Methods 0.000 claims abstract description 24
- 238000002485 combustion reaction Methods 0.000 claims abstract description 18
- 230000001105 regulatory effect Effects 0.000 claims abstract description 17
- 230000001276 controlling effect Effects 0.000 claims abstract description 6
- 239000003245 coal Substances 0.000 claims description 40
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 38
- 239000003546 flue gas Substances 0.000 claims description 38
- 238000006477 desulfuration reaction Methods 0.000 claims description 21
- 239000002245 particle Substances 0.000 claims description 21
- 230000023556 desulfurization Effects 0.000 claims description 20
- 239000007787 solid Substances 0.000 claims description 20
- 238000005243 fluidization Methods 0.000 claims description 14
- 238000009825 accumulation Methods 0.000 abstract description 7
- 238000005260 corrosion Methods 0.000 abstract description 7
- 230000007797 corrosion Effects 0.000 abstract description 7
- 238000010438 heat treatment Methods 0.000 abstract description 6
- 239000002893 slag Substances 0.000 abstract description 5
- 230000015572 biosynthetic process Effects 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 230000029087 digestion Effects 0.000 description 4
- 238000010344 co-firing Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- 244000052616 bacterial pathogen Species 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/001—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals for sludges or waste products from water treatment installations
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The invention provides a device system and a method for mixing and burning wet sludge of a circulating fluidized bed boiler, wherein the device system comprises the circulating fluidized bed boiler, a cyclone separation device, a returning device and a sludge drying device; the circulating fluidized bed boiler, the cyclone separation device and the material returning device are sequentially connected; the material returning device comprises a primary material returning device and a secondary material returning device which are connected in series and/or in parallel; the sludge drying device is connected with the secondary material returning device. According to the invention, the two-stage returning device is arranged behind the cyclone separation device, so that the combustion process and the heat exchange process of the circulating fluidized bed boiler are separated, and the problem of slag formation, corrosion and ash accumulation of a heating surface of the circulating fluidized bed boiler when sludge is mixed and burned is effectively solved; by controlling the regulating valve, two working states of sludge mixed burning or sludge not mixed burning of the circulating fluidized bed boiler are flexibly switched, so that the power consumption of a factory is effectively saved, and the circulating fluidized bed boiler is suitable for large-scale popularization and application.
Description
Technical Field
The invention relates to the technical field of circulating fluidized bed boilers, in particular to a device system and a method for blending and burning wet sludge of a circulating fluidized bed boiler.
Background
With the development of social economy, the acceleration of urban process and the improvement of national living standard, the urban domestic sewage quantity is increased sharply, and the output of the sludge which is used as an accessory product after sewage treatment of a sewage treatment plant is also increased continuously. The sludge itself has a certain calorific value and the yield is as high as tens of millions of tons per year. This portion of sludge has potential energy utilization value. The wet sludge has high moisture content and low external heat release amount due to combustion per unit mass, and the direct blending combustion of the sludge tends to reduce the combustion temperature of a hearth, so that the combustion instability is caused, the carbon content of ash is increased, and the boiler efficiency is reduced, so that the sludge is difficult to treat on a large scale by direct blending combustion in a coal-fired furnace. The circulating fluidized bed boiler is a preferable technical scheme for cooperatively disposing sludge of the coal-fired unit due to the characteristics of fuel adaptability, low pollutant discharge, flexible operation and the like.
However, the circulating fluidized bed is mixed with the sludge in actual operation, and due to the complex nature of the sludge, the problems of serious slagging, corrosion and ash accumulation can be caused, particularly, the problem of blockage of the material returning equipment can be caused, and the safe and stable operation of the circulating fluidized bed can be greatly influenced.
CN1616885a discloses a method and apparatus for blending and burning sludge in a circulating fluidized bed boiler, a sludge feed inlet is arranged at the upper end of the blending and burning sludge in the circulating fluidized bed boiler, a conveying pipeline is connected to the sludge feed inlet, and the other end of the conveying pipeline is connected to an output port of a sludge plunger pump. The method for blending and burning the sludge in the circulating fluidized bed boiler comprises the following steps: a. inputting sludge into the mixed-burned sludge of the circulating fluidized bed boiler in a negative pressure area at the upper part of a hearth of the mixed-burned sludge of the circulating fluidized bed boiler; b. the sludge accounts for within 50 percent of the weight of the fuel, and the water content of the sludge is 78-82 percent; c. the sludge is dried in the furnace and is changed into fine ash after being burned, and harmful microorganisms, harmful pathogenic bacteria and peculiar smell in the sludge remained in the sludge are decomposed at a high temperature of 850-950 ℃ for more than 2-6 seconds, so that the harmful microorganisms, the harmful pathogenic bacteria and the peculiar smell in the sludge are thoroughly eliminated.
CN110332548A discloses a circulating fluidized bed boiler with a direct sludge co-firing system, comprising a sludge conveying system and a sludge blanking system; the sludge conveying system comprises a first sludge belt conveyor, a second sludge belt conveyor, a trestle coal conveying belt and a stokehold sludge belt conveyor which are sequentially connected, wherein the output end of the stokehold sludge belt conveyor is connected with the inlet of an intermediate sludge storage bin, and the lower outlet of the intermediate sludge storage bin is connected with a shaftless screw feeder; the sludge blanking system comprises a sludge blanking pipe and a sludge feeding coal tank, the sludge feeding coal tank is arranged on a boiler hearth, one end of the sludge blanking pipe is connected with an outlet of the shaftless screw feeder through a pneumatic gate, and the other end of the sludge blanking pipe is connected with the sludge feeding coal tank, so that whole-course automatic control can be realized.
CN112377924a discloses a system and method for blending and burning sludge in a circulating fluidized bed boiler with medium temperature separation, the system comprises a cyclone separator with medium temperature separation, etc., the method comprises: when the middle-temperature separation circulating fluidized bed boiler is used for mixing and burning sludge, the sludge is conveyed to a vertical feeder above a corner flue of a central cylinder of the middle-temperature separation cyclone separator through a plunger pump, the agglomerated sludge is cut and scattered by the vertical feeder and then enters the central cylinder, the sludge sequentially passes through the central cylinder, a cylinder body and a cone from top to bottom, the sludge is in direct contact with ascending middle-temperature flue gas for heat exchange in the moving process, under the turbulent flow effect, moisture in the sludge is rapidly evaporated, particles shrink, collapse and redisperse, the water content of the sludge falls to about 40% and falls into an ash discharge port, and the sludge is mixed with circulating ash and then conveyed to a circulating fluidized bed boiler mixing and burning sludge hearth through a returning device for burning.
However, the above sludge-mixed circulating fluidized bed boiler has yet to be further improved in terms of alleviating the problems of slagging corrosion and ash accumulation on the heating surface of the boiler.
Disclosure of Invention
In view of the problems in the prior art, the invention provides a device system and a method for mixing and burning wet sludge of a circulating fluidized bed boiler, which effectively relieve the problems of slag formation, corrosion and ash accumulation of a heating surface of the circulating fluidized bed boiler when mixing and burning the sludge by arranging a two-stage returning device behind a cyclone separation device; the tail flue gas is adopted to dry the sludge, so that the water content of the sludge is reduced, and the sludge digestion capacity of the boiler is improved; the dried flue gas is sent to the secondary material returning device, the temperature of the material returning device can be adjusted, the blocking condition of the material returning device is relieved, and the flue gas has a large-scale popularization and application prospect.
To achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a device system for blending and burning wet sludge of a circulating fluidized bed boiler, wherein the device system comprises the circulating fluidized bed boiler, a cyclone separation device, a returning device and a sludge drying device;
the circulating fluidized bed boiler, the cyclone separation device and the material returning device are sequentially connected;
the material returning device comprises a primary material returning device and a secondary material returning device which are connected in series and/or in parallel; the sludge drying device is connected with the secondary material returning device.
The device system for mixing and burning wet sludge of the circulating fluidized bed boiler separates the combustion process and the heat exchange process of the circulating fluidized bed boiler by utilizing the two-stage material returning device, so that the problem of slag formation, corrosion and ash accumulation of a heating surface of the circulating fluidized bed boiler when mixing and burning the sludge can be effectively solved; the tail flue gas is introduced to dry the sludge, so that the water content of the sludge is reduced, the sludge digestion capacity of the boiler is improved, and the dried flue gas is fed into the secondary returning device, so that the temperature of the returning device can be effectively regulated, and the blocking condition in the returning device is relieved.
Preferably, a first connecting pipeline and a second connecting pipeline are arranged between the first-stage returning device and the second-stage returning device, and a regulating valve is arranged on the second connecting pipeline and used for controlling the operation or the shutdown of the second-stage returning device.
According to the invention, the regulating valve is arranged, so that when the circulating fluidized bed boiler does not burn sludge or the water content of the sludge is low and the sludge does not need to be dried by flue gas, the regulating valve can be closed, the secondary material returning device is stopped, and at the moment, the circulating fluidized bed boiler only adopts the primary material returning device to operate, so that the station service electricity can be effectively saved.
Preferably, the plant system further comprises a first fluidization fan and a second fluidization fan.
Preferably, the first fluidization fan is respectively connected with the cyclone separation device and the first-stage returning device.
Preferably, the second fluidization fan is connected with the secondary material returning device.
Preferably, the device system further comprises a coal storage device and a coal conveying device which are connected in sequence.
Preferably, the coal conveying device is connected with a circulating fluidized bed boiler.
Preferably, the device system further comprises a sludge storage device and a sludge conveying device which are respectively connected with the sludge drying device.
Preferably, the sludge conveying device is connected with a circulating fluidized bed boiler.
Preferably, the device system further comprises a heat exchange device, a coal saving device, an air preheating device and a desulfurization and denitrification device which are sequentially arranged in the tail flue of the circulating fluidized bed boiler.
Preferably, the desulfurization and denitrification device is connected with a chimney.
Preferably, a flue gas branch is arranged between the air preheating device and the desulfurization and denitrification device.
Preferably, the flue gas branch is connected with a sludge drying device.
According to the invention, the flue gas after passing through the air preheating device is introduced into the sludge drying device to dry the sludge, so that the full recycling of heat in the flue gas is realized, the flue gas quantity entering the desulfurization and denitrification device can be reduced, and the workload of the desulfurization and denitrification device is reduced.
In a second aspect, the invention also provides a method for blending and burning wet sludge in a circulating fluidized bed boiler, which is carried out by adopting the device system for blending and burning wet sludge in the circulating fluidized bed boiler in the first aspect;
the method comprises the following steps:
the flue gas generated in the circulating fluidized bed boiler enters a cyclone separation device, and when the circulating fluidized bed boiler is mixed with sludge, solid particles generated by separation are returned to the circulating fluidized bed boiler through a first-stage returning device and a second-stage returning device in sequence for re-combustion; a part of the separated flue gas enters a sludge drying device to dry sludge, and the dried sludge enters a circulating fluidized bed boiler through a secondary material returning device to be mixed with fire coal;
when the circulating fluidized bed boiler is not mixed with sludge, solid particles generated by separation return to the circulating fluidized bed boiler through the first-stage returning device for re-combustion; and the separated flue gas is discharged through a tail flue.
The method for blending and burning wet sludge of the circulating fluidized bed boiler can flexibly switch two working states of blending and burning sludge or not blending and burning sludge of the circulating fluidized bed boiler, can effectively consume sludge, can save power consumption of a factory, and has high economic benefit.
Preferably, when the circulating fluidized bed boiler is mixed with sludge, the regulating valve on the second connecting pipeline is opened, and solid particles generated by separation sequentially pass through the first-stage returning device and the second-stage returning device.
Preferably, when the circulating fluidized bed boiler is not mixed with sludge, the regulating valve on the second connecting pipeline is closed, and solid particles generated by separation only pass through the first-stage returning device.
Preferably, the first fluidizing wind conveyed by the first fluidizing fan conveys the solid particles generated by separation into a circulating fluidized bed boiler.
Preferably, the second fluidized wind conveyed by the second fluidized fan conveys the solid particles generated by separation and the dried sludge into a circulating fluidized bed boiler.
Preferably, the fire coal in the fire coal storage device is sent to the circulating fluidized bed boiler through the coal conveying device.
Preferably, the sludge in the sludge storage device is sent to the circulating fluidized bed boiler through the sludge conveying device after being dried by the flue gas through the sludge drying device.
Preferably, the flue gas generated by the circulating fluidized bed boiler is subjected to heat exchange by a heat exchange device, a coal saving device and an air preheating device in a tail flue, is treated by a desulfurization and denitrification device, and is finally discharged through a chimney.
Preferably, the flue gas between the air preheating device and the desulfurization and denitrification device enters the sludge drying device through the flue gas branch to dry the sludge.
As a preferred technical solution of the present invention, the method includes:
the fire coal in the fire coal storage device is sent into the circulating fluidized bed boiler to burn through the coal conveying device, and the generated smoke enters the cyclone separation device;
when the circulating fluidized bed boiler is mixed with sludge, a regulating valve on a second connecting pipeline is opened, solid particles generated by separation sequentially pass through a first-stage returning device and a second-stage returning device, and the first fluidizing air conveyed by a first fluidizing fan conveys the solid particles generated by separation into the circulating fluidized bed boiler for re-combustion; the second fluidized air conveyed by the second fluidized fan conveys solid particles generated by separation and dried sludge into a circulating fluidized bed boiler for re-combustion;
the flue gas between the air preheating device and the desulfurization and denitrification device enters a sludge drying device through a flue gas branch to dry the sludge conveyed by the sludge storage device, and the dried sludge enters a circulating fluidized bed boiler through a secondary material returning device to be mixed with fire coal;
when the circulating fluidized bed boiler is not mixed with sludge, solid particles generated by separation are returned to the circulating fluidized bed boiler through the primary material returning device for re-combustion; the separated flue gas is treated by a desulfurization and denitrification device after heat exchange by a heat exchange device, a coal saving device and an air preheating device in the tail flue, and finally is discharged by a chimney.
Compared with the prior art, the invention has at least the following beneficial effects:
(1) The device system for blending and burning wet sludge of the circulating fluidized bed boiler provided by the invention has the advantages that the problems of slag formation, corrosion and ash accumulation on the heating surface and blockage of the returning device of the circulating fluidized bed boiler during blending and burning sludge are solved, and the sludge digestion capacity of the circulating fluidized bed boiler is improved;
(2) According to the method for blending and burning wet sludge of the circulating fluidized bed boiler, disclosed by the invention, the two working states of blending and burning sludge or not blending and burning sludge of the circulating fluidized bed boiler are flexibly switched through controlling the regulating valve, so that the power consumption of a factory is effectively saved, and the method is suitable for large-scale popularization and application.
Drawings
Fig. 1 is a schematic structural diagram of an apparatus system for co-firing wet sludge in a circulating fluidized bed boiler according to embodiment 1.
In the figure: 1-a coal-fired storage device; 2-a coal conveying device; 3-a sludge storage device; 4-a sludge drying device; 5-a sludge conveying belt; 6-circulating fluidized bed boiler; 7-a cyclone separation device; 8-a first-stage returning device; 9-a secondary material returning device; 10-a first fluidization fan; 11-a second fluidization fan; 12-a heat exchange device; 13-a coal-saving device; 14-an air preheating device; 15-desulfurization and denitrification device; 16-chimney; 17-regulating valve.
Detailed Description
The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings.
The present invention will be described in further detail below. The following examples are merely illustrative of the present invention and are not intended to represent or limit the scope of the invention as defined in the claims.
It is to be understood that in the description of the present invention, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
It should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.
It will be appreciated by those skilled in the art that the present invention necessarily includes the necessary piping, conventional valves and general pumping equipment for achieving the process integrity, but the foregoing is not a major inventive aspect of the present invention, and that the present invention is not particularly limited thereto as the layout may be automatically added by those skilled in the art based on the process flow and the equipment configuration options.
Example 1
The embodiment provides a device system for blending and burning wet sludge of a circulating fluidized bed boiler, and the structure schematic diagram of the device system is shown in fig. 1.
The device system comprises a circulating fluidized bed boiler 6, a cyclone separation device 7, a returning device and a sludge drying device 4;
the circulating fluidized bed boiler 6, the cyclone separation device 7 and the material returning device are sequentially connected;
the material returning device comprises a primary material returning device 8 and a secondary material returning device 9 which are connected in series and/or in parallel; the sludge drying device 4 is connected with a secondary material returning device 9.
A first connecting pipeline and a second connecting pipeline are arranged between the first-stage returning device 8 and the second-stage returning device 9, and a regulating valve 17 is arranged on the second connecting pipeline and used for controlling the operation or the stop of the second-stage returning device 9.
The plant system further comprises a first fluidization fan 10 and a second fluidization fan 11;
the first fluidization fan 10 is respectively connected with the cyclone separation device 7 and the primary material returning device 8;
the second fluidization fan 11 is connected with the secondary material returning device 9.
The device system also comprises a coal storage device 1 and a coal conveying device 2 which are connected in sequence;
the coal conveying device 2 is connected with a circulating fluidized bed boiler 6.
The device system also comprises a sludge storage device 3 and a sludge conveying device 5 which are respectively connected with the sludge drying device 4;
the sludge conveying device 5 is connected with a circulating fluidized bed boiler 6.
The device system also comprises a heat exchange device 12, a coal-saving device 13, an air preheating device 14 and a desulfurization and denitrification device 15 which are sequentially arranged in the tail flue of the circulating fluidized bed boiler 6;
the desulfurization and denitrification device 15 is connected with a chimney 16.
A flue gas branch is arranged between the air preheating device 14 and the desulfurization and denitrification device 15;
the flue gas branch is connected with a sludge drying device 4.
The embodiment also provides a method for blending and burning wet sludge by the circulating fluidized bed boiler, which is carried out by adopting the device system for blending and burning wet sludge by the circulating fluidized bed boiler; the regulating valve 17 is in an open state, and the secondary material returning device 9 operates normally;
the method comprises the following steps:
the coal in the coal storage device is sent into a circulating fluidized bed boiler through a coal conveying device, and flue gas generated by combustion in the circulating fluidized bed boiler enters a cyclone separation device;
at the moment, the circulating fluidized bed boiler is mixed with the sludge, a regulating valve on a second connecting pipeline is opened, solid particles generated by separation sequentially pass through a first-stage returning device and a second-stage returning device, and the first fluidizing air conveyed by a first fluidizing fan conveys the solid particles generated by separation into the circulating fluidized bed boiler for re-combustion; the second fluidized air conveyed by the second fluidized fan conveys solid particles generated by separation and dried sludge into a circulating fluidized bed boiler for re-combustion;
the flue gas between the air preheating device and the desulfurization and denitrification device enters a sludge drying device through a flue gas branch to dry sludge, and the dried sludge enters a circulating fluidized bed boiler through a secondary material returning device to be mixed with fire coal;
and the flue gas generated by the circulating fluidized bed boiler is subjected to heat exchange through a heat exchange device, a coal saving device and an air preheating device in the tail flue, is treated through a desulfurization and denitrification device, and is finally discharged through a chimney.
Example 2
This example provides a system of apparatus for co-firing wet sludge for a circulating fluidized bed boiler, which is the same as that of example 1.
The embodiment also provides a method for blending and burning wet sludge by the circulating fluidized bed boiler, which is carried out by adopting the device system for blending and burning wet sludge by the circulating fluidized bed boiler; the regulating valve 17 is in a closed state, and the secondary material returning device 9 is stopped;
the method comprises the following steps:
the fire coal in the fire coal storage device is sent into the circulating fluidized bed boiler to burn through the coal conveying device, and the generated smoke enters the cyclone separation device;
at the moment, the circulating fluidized bed boiler is not mixed with sludge, solid particles generated by separation only pass through the first-stage returning device, and the first fluidizing air conveyed by the first fluidizing air blower is conveyed into the circulating fluidized bed boiler for re-combustion;
the separated flue gas is treated by a desulfurization and denitrification device after heat exchange by a heat exchange device, a coal saving device and an air preheating device in the tail flue, and finally is discharged by a chimney.
In summary, the device system for blending and burning wet sludge of the circulating fluidized bed boiler provided by the invention relieves the problems of slag bonding, corrosion and ash accumulation on the heating surface and blockage of the material returning device when the circulating fluidized bed boiler blends and burns the sludge, and improves the sludge digestion capacity of the circulating fluidized bed boiler; by controlling the regulating valve, two working states of sludge mixed burning or sludge not mixed burning of the circulating fluidized bed boiler are flexibly switched, so that the power consumption of a factory is effectively saved, and the circulating fluidized bed boiler is suitable for large-scale popularization and application.
The applicant states that the detailed structural features of the present invention are described by the above embodiments, but the present invention is not limited to the above detailed structural features, i.e. it does not mean that the present invention must be implemented depending on the above detailed structural features. It should be apparent to those skilled in the art that any modifications of the present invention, equivalent substitutions of selected components of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope of the present invention and the scope of the disclosure.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention.
Claims (10)
1. The device system for the mixed burning of the wet sludge of the circulating fluidized bed boiler is characterized by comprising the circulating fluidized bed boiler, a cyclone separation device, a returning device and a sludge drying device;
the circulating fluidized bed boiler, the cyclone separation device and the material returning device are sequentially connected;
the material returning device comprises a primary material returning device and a secondary material returning device which are connected in series and/or in parallel; the sludge drying device is connected with the secondary material returning device.
2. The device system according to claim 1, wherein a first connecting pipeline and a second connecting pipeline are arranged between the primary material returning device and the secondary material returning device, and a regulating valve is arranged on the second connecting pipeline for controlling the operation or the shutdown of the secondary material returning device.
3. The plant system according to claim 1 or 2, further comprising a first fluidization fan and a second fluidization fan;
preferably, the first fluidization fan is respectively connected with the cyclone separation device and the first-stage returning device;
preferably, the second fluidization fan is connected with the secondary material returning device.
4. A plant system according to any one of claims 1 to 3, further comprising a coal storage device and a coal conveying device connected in sequence;
preferably, the coal conveying device is connected with a circulating fluidized bed boiler.
5. The system of any one of claims 1 to 4, further comprising a sludge storage device and a sludge transfer device, each connected to the sludge drying device;
preferably, the sludge conveying device is connected with a circulating fluidized bed boiler.
6. The device system according to any one of claims 1 to 5, further comprising a heat exchange device, a coal saving device, an air preheating device and a desulfurization and denitrification device which are sequentially arranged in the tail flue of the circulating fluidized bed boiler;
preferably, the desulfurization and denitrification device is connected with a chimney.
7. The device system according to any one of claims 1 to 6, wherein a flue gas bypass is provided between the air preheating device and the desulfurization and denitrification device;
preferably, the flue gas branch is connected with a sludge drying device.
8. A method for blending and burning wet sludge in a circulating fluidized bed boiler, which is characterized in that the method is carried out by adopting the device system for blending and burning wet sludge in the circulating fluidized bed boiler according to any one of claims 1 to 7;
the method comprises the following steps:
the flue gas generated in the circulating fluidized bed boiler enters a cyclone separation device, and when the circulating fluidized bed boiler is mixed with sludge, solid particles generated by separation are returned to the circulating fluidized bed boiler through a first-stage returning device and a second-stage returning device in sequence for re-combustion; a part of the separated flue gas enters a sludge drying device to dry sludge, and the dried sludge enters a circulating fluidized bed boiler through a secondary material returning device to be mixed with fire coal;
when the circulating fluidized bed boiler is not mixed with sludge, solid particles generated by separation are returned to the circulating fluidized bed boiler through the primary material returning device for re-combustion; and the separated flue gas is discharged through a tail flue.
9. The method according to claim 8, wherein when the circulating fluidized bed boiler is mixed with sludge, a regulating valve on the second connecting pipeline is opened, and solid particles generated by separation pass through the primary material returning device and the secondary material returning device in sequence;
preferably, when the circulating fluidized bed boiler is not mixed with sludge, the regulating valve on the second connecting pipeline is closed, and solid particles generated by separation only pass through the first-stage returning device;
preferably, the first fluidizing wind conveyed by the first fluidizing fan conveys the solid particles generated by separation into a circulating fluidized bed boiler;
preferably, the second fluidized air conveyed by the second fluidized fan conveys the solid particles generated by separation and the dried sludge into a circulating fluidized bed boiler;
preferably, the fire coal in the fire coal storage device is sent into the circulating fluidized bed boiler through the coal conveying device;
preferably, the sludge in the sludge storage device is sent to the circulating fluidized bed boiler through the sludge conveying device after being dried by the flue gas through the sludge drying device.
10. The method according to claim 8 or 9, wherein the flue gas generated by the circulating fluidized bed boiler is treated by a desulfurization and denitrification device after heat exchange by a heat exchange device, a coal saving device and an air preheating device in a tail flue, and finally discharged by a chimney;
preferably, the flue gas between the air preheating device and the desulfurization and denitrification device enters the sludge drying device through the flue gas branch to dry the sludge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310763212.4A CN116734268A (en) | 2023-06-27 | 2023-06-27 | Device system and method for mixing and burning wet sludge of circulating fluidized bed boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310763212.4A CN116734268A (en) | 2023-06-27 | 2023-06-27 | Device system and method for mixing and burning wet sludge of circulating fluidized bed boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116734268A true CN116734268A (en) | 2023-09-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202310763212.4A Pending CN116734268A (en) | 2023-06-27 | 2023-06-27 | Device system and method for mixing and burning wet sludge of circulating fluidized bed boiler |
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| Country | Link |
|---|---|
| CN (1) | CN116734268A (en) |
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2023
- 2023-06-27 CN CN202310763212.4A patent/CN116734268A/en active Pending
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