CN109027989B - Method for utilizing residual heat of coal coke powder of fluidized bed - Google Patents
Method for utilizing residual heat of coal coke powder of fluidized bed Download PDFInfo
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- CN109027989B CN109027989B CN201810865353.6A CN201810865353A CN109027989B CN 109027989 B CN109027989 B CN 109027989B CN 201810865353 A CN201810865353 A CN 201810865353A CN 109027989 B CN109027989 B CN 109027989B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B39/00—Cooling or quenching coke
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B39/00—Cooling or quenching coke
- C10B39/02—Dry cooling outside the oven
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/26—Steam-separating arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
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Abstract
The invention relates to a method for utilizing waste heat of coal coke powder of a fluidized bed, belonging to the field of pyrolysis and dry distillation of a pulverized coal fluidized bed, cooling the high-temperature coal coke powder subjected to dry distillation to a safe packaging temperature, and generating steam by utilizing the waste heat of the coal coke powder. The method for utilizing the residual heat of the coal coke powder of the fluidized bed adopts a multi-stage series connection mode according to the temperature grade of the coal coke powder and is divided into a high-temperature steam generation part and a medium preheating part; grading and utilizing the residual heat of the coke powder; the high-temperature coal coke powder flows through the steam production area and the cooling medium preheating area in sequence and flows out of the cooling medium preheating area.
Description
Technical Field
The invention belongs to the field of pyrolysis and dry distillation of a pulverized coal fluidized bed, and particularly relates to a method for utilizing waste heat of coal coke powder of a fluidized bed.
Background
The coal dry distillation is to convert coal into semicoke, coal tar and coal gas tri-state products in an inert atmosphere by a heating mode. Coal dry distillation can be divided into low-temperature dry distillation, medium-temperature dry distillation and high-temperature dry distillation according to different heating temperatures. The heating temperature is low-temperature dry distillation at 500-600 ℃, medium-temperature dry distillation at 700-900 ℃ and high-temperature dry distillation at 900-1100 ℃. At present, the coal dry distillation technology is more, and the heating temperature and the heating mode have larger difference. The coal carbonization products mainly comprise coal tar and semicoke. The semicoke is a product with high fixed carbon, high calorific value, low fraction and low volatile component, and has complex particle size composition, particle coal of about 10-8 mm and pulverized coal with small particle size. The dry distillation coke cooling also has different methods according to different coke powder, the influence of the granularity on the pulverized coal cooling is mainly realized by heat transfer and mass transfer, the size of coal particles directly influences the specific surface area, the density, the pore structure and the like of coal, and the heat transfer of the coal particles can be greatly influenced, so the dry distillation of the fluidized bed is only suitable for the pulverized coal with smaller particle size. However, coal dust is far from the catalyst particles for most gas-solid reactions because the cooling of coal dust cannot be carried out according to conventional fluidization, regardless of the specific gravity (density), particle shape, or particle distribution of the material, which is completely different from that of the conventional catalyst.
The temperature of the coke powder (also called coke breeze) after the pulverized coal pyrolysis is high, the low-temperature dry distillation temperature is 500-600 ℃, but the temperature required for directly bagging the coke powder is less than 60 ℃, the coke powder is economically and deeply cooled by using the waste heat of the coke powder, and great challenges are provided for the design of a cooling system. In addition, the dry distilled coal coke powder usually contains tar, and the coal coke powder is easy to agglomerate after low temperature, thereby influencing transportation and heat exchange. Therefore, the cooling of the coke powder is more difficult than the heat exchange of the conventional chemical process in the aspects of heat transfer and temperature.
Disclosure of Invention
The invention aims to provide a method for utilizing the residual heat of the coke powder of a fluidized bed, and the method can cool the high-temperature coke powder after dry distillation to a safe packaging temperature and realize the utilization of the residual heat of the coke powder.
The invention aims to provide a method for utilizing the residual heat of coal coke powder of a fluidized bed, which adopts a multi-stage series connection mode and is divided into a high-temperature steam generation part and a cooling medium preheating part, the coal coke powder is cooled in a cooler, and the cooler is provided with a steam generation part shell, a cooling medium preheating part shell and a bottom end enclosure; the heat of the high-temperature coal coke powder is utilized in a grading way, the high-temperature part is used for generating steam, the steam is separated from water in a water-steam separator (also called a water-steam separation area), and the low-temperature part after the steam is generated, namely the low-temperature coal coke powder, is used for heating circulating water; high-temperature coal coke powder firstly enters a steam producing part (also called a steam producing area), enters a cooling medium preheating part after the heat release of steam production lowers the temperature, and flows out after being cooled to the required temperature in the cooling medium preheating part; an evaporation pipe is arranged in the steam production part, and the high-temperature coal coke powder transfers heat to the steam production part in the evaporation pipe through the evaporation pipe to supply water to produce steam; the cooling medium preheating part is provided with a circulating water heat exchange pipe, circulating water is in the pipe, and coal coke powder is outside the pipe; the steam producing part and the cooling medium preheating part are fluidized by a fluidizing medium to control the temperature and the steam production of the coke powder.
In the invention, high-temperature coal coke powder firstly enters a steam production part, the steam production part leads the coal coke powder to form a fluidization condition through a steam production fluidization medium to realize the heat transfer of the coal coke powder to an evaporation tube, and the fluidization medium is from a cooling medium preheating part or is independently arranged, or the fluidization medium is from a cooling medium preheating part and a fluidization medium supplemented by the steam production part; the high-temperature coal coke powder is fluidized by a steam-producing fluidized medium, so that the coal coke powder exchanges heat with an evaporation pipe of a steam-producing part, the coal coke powder enters a cooling medium preheating part after the heat released by the steam is released and the temperature is reduced, the cooling fluidized medium is arranged at the coal coke powder cooling medium preheating part, the coal coke powder is fluidized by the cooling fluidized medium, so that the coal coke powder exchanges heat with circulating water in a circulating water heat exchange pipe of the cooling medium preheating part to be continuously cooled, and the coal coke powder flows out of the cooling medium preheating part after the cooling requirement is met.
The high temperature is not defined in principle and can be adjusted according to the temperature requirement of specific steam production. In general, the high-temperature coal coke powder refers to the condition that the temperature is higher than 200 ℃.
The method for utilizing the residual heat of the coal coke powder of the fluidized bed comprises the following steps of generating steam after water supply of a steam generating part exchanges heat with high-temperature coal coke powder of the steam generating part, directly performing water-vapor separation above the steam generating part, separating the water-vapor separator from the steam generating part by using a split tube plate or a partition plate, connecting an evaporation tube to the split tube plate or the partition plate, vertically arranging the evaporation tube in a sleeve form, arranging an inner tube and an outer tube of the evaporation tube, connecting the outer tube of the evaporation tube to the split tube plate or the partition plate, enabling the water supply of the steam generating part to enter the inner tube from a top inlet, enabling the water to flow downwards to the bottom of the evaporation tube to turn to enter annular gaps of the inner tube and the outer tube, enabling the steam to flow upwards in the annular gaps between the inner tube and.
The method for utilizing the residual heat of the coal coke powder of the fluidized bed further comprises the steps that a cooling medium preheating part and a steam generating part are integrated up and down, the cooling medium preheating part is directly arranged at the lower part of the steam generating part, and the coal coke powder of the steam generating part directly settles and enters the cooling medium preheating part after exchanging heat with an evaporation pipe; the cooling medium preheating part is provided with a cooling fluidizing medium which controls the cooling temperature of the coke powder at the cooling medium preheating part; the cooling fluidizing medium flows out of the cooling medium preheating part upwards and then enters a steam producing part, and the coal coke powder of the steam producing part is continuously fluidized; the steam producing part can supplement a steam producing fluidizing medium, and the steam producing fluidizing medium and the cooling fluidizing medium are mixed together to fluidize the coal coke powder of the steam producing part and control the heat exchange of the steam producing part.
Furthermore, a multi-channel partition plate is arranged between the steam producing part and the cooling medium preheating part, one or more coke powder descending channels and a plurality of fluidizing medium ascending channels are arranged on the channel partition plate, so that the coke powder in the steam producing part flows to the cooling medium preheating part below through the coke powder descending channels of the partition plate, and the cooling fluidizing medium in the cooling medium preheating part enters the steam producing part through the fluidizing medium ascending channels of the partition plate. In specific implementation, the passage partition plate is generally transversely connected to the shell, the fluidized medium ascending passage of the passage partition plate is generally in a round hole shape, the passage partition plate can be in a cone shape or an arc shape, and a technician of the equipment structure of the passage partition plate can design the passage partition plate according to specific working conditions.
The method for utilizing the residual heat of the coal coke powder of the fluidized bed further comprises the steps that a cooling medium preheating part is arranged outside a steam production part, and the coal coke powder cooled in the steam production part enters the cooling medium preheating part through a conveying pipe to be cooled; the cooling medium preheating part is provided with a cooling fluidizing medium which controls the cooling temperature of the coke powder in the cooling medium preheating part.
The method for utilizing the residual heat of the coal coke powder of the fluidized bed further comprises the following steps of circulating water of a preheating part of a cooling medium in the following mode:
or the circulating water heat exchange tubes are grouped to directly pass through the shell of the cooling medium preheating part or the bottom end socket to enter and exit the cooling medium preheating part; circulating water circulates independently in each group of circulating water heat exchange pipes respectively;
or a cooling tube plate or a partition plate is arranged at the bottom of the cooling medium preheating part, the lower end of the circulating water heat exchange tube is connected to the cooling tube plate or the partition plate, a circulating water inlet and outlet is arranged on a part or a bottom sealing head of the shell of the cooling medium preheating part, which is positioned below the cooling tube plate or the partition plate, and circulating water circulates in the circulating water heat exchange tube from the inlet and outlet;
or the circulating water heat exchange pipe adopts an inner sleeve and an outer sleeve, and two pipe plates or clapboards are arranged at the bottom of the cooling medium preheating part and respectively comprise an upper pipe plate or clapboard and a lower pipe plate or clapboard; the lower end of the inner tube of the heat exchange tube is arranged on the lower tube plate, and the lower end of the outer tube is arranged on the upper tube plate; circulating water enters an annular gap between the outer pipe and the inner pipe at the bottom of the circulating water heat exchange pipe, flows upwards in the annular gap and is heated, turns to enter the inner pipe at the top of the circulating water heat exchange pipe and flows downwards, and flows out of the heat exchange pipe from the bottom of the inner pipe; a circulating water inlet is arranged at the part of the shell of the preheating part of the cooling medium, which is positioned between the upper tube plate and the lower tube plate or between the partition plates; and a circulating water outlet is arranged on the part of the shell of the cooling medium preheating part, which is positioned below the lower tube plate or the partition plate, or the bottom end enclosure, and circulating water enters and exits the cooling medium preheating part from the inlet and the outlet.
Furthermore, the circulating water heat exchange tube is in an inner and outer sleeve form, a partition plate is arranged on an upper tube plate or a lower tube plate, the circulating water heat exchange tube is divided into 1-6 zones, 1-6 water inlets are formed in the part, located between the upper tube plate and the lower tube plate, of the cooling medium preheating part shell, 1-6 water outlets are formed in the part, located below the lower tube plate, of the cooling medium preheating part shell or a bottom end socket, circulating water is respectively and independently preheated in each zone, and circulating water in each zone enters the circulating water heat exchange tube from an annular gap between the inner tube and the outer tube and flows out from the inner tube.
The method for utilizing the residual heat of the coal coke powder of the fluidized bed further adopts steam, nitrogen or flue gas containing less than 2% of oxygen (the flue gas is gas generated after oxygen combustion reaction in air, and flue gas or other flue gas generated in coke powder combustion in the pulverized coal dry distillation process) as a fluidizing medium, and the fluidizing medium enables coal tar gas carried by the coal coke powder to flow out or return to a dry distillation reactor along with the fluidizing medium while realizing fluidization and heat exchange of the coal coke powder, so that the yield of dry distillation products is improved, the combustion of the cooled coal coke powder is avoided, or the combustion chance of the cooled coal coke powder is reduced. The flue gas used as the fluidizing medium is flue gas obtained by recovering waste heat of the flue gas burnt by the dry distillation device by a waste heat boiler and the like and then cooling the flue gas or flue gas obtained by recovering waste heat from other devices.
Furthermore, steam or flue gas is used as a fluidizing medium in the steam production part, and nitrogen is adopted to fluidize the coal coke powder before the coal coke powder cooled by the cooling medium preheating part flows out of the flow outlet; or steam or flue gas is used as a fluidizing medium in the steam production part and the cooling medium preheating part, and nitrogen is used as the fluidizing medium before the coal coke powder flows out from the cooling medium preheating part to replace the gas carried by the coal coke powder. In specific implementation, when the cooling temperature of the coal coke powder is lower than 100 ℃, nitrogen is used as a fluidizing medium to replace gas carried by the coal coke powder before the preheated part of the coal coke powder flows out of the cooling medium.
The method for utilizing the residual heat of the fluidized bed coke powder is further implemented in a concrete way that circulating water is heated in the preheating part of the cooling medium and then is used as water supply for the steam production part.
The invention effectively solves the problems of fluidization and heat transfer of the high-temperature coal coke powder after coal carbonization, cools the high-temperature coal coke powder after carbonization to a safe packaging temperature, and realizes the utilization of the waste heat of the coal coke powder.
Drawings
FIG. 1 is a schematic view of an embodiment of the method for utilizing waste heat of coal coke powder according to the present invention;
FIG. 2 is an enlarged view of a portion of the evaporator tube of FIG. 1;
FIG. 3 is a schematic view of an embodiment of a method for utilizing residual heat of coal coke powder according to the present invention.
The numbering in the figures illustrates: 1, a cooler; 11 steam producing part, 12 cooling medium preheating part, 13 water-steam separator, 14 steam producing part shell, 14-1 cooling medium preheating part shell, 15 split tube plate or partition plate, 111 coke powder inlet pipe, 112 steam producing fluidizing medium inlet pipe, 113 fluidizing gas outlet pipe and 114 conveying pipe; a coal coke powder outlet pipe 121, a cooling fluidizing medium inlet pipe 122, a cooling medium preheating part heat taking medium inlet pipe 123, a cooling medium preheating part heat taking medium outlet pipe 124 and a second fluidizing gas outlet pipe 125; 131 steam-producing part water supply inlet pipe, 132 steam outlet pipe; 2 evaporation tube, 21 evaporation tube outer tube, 22 inner tube; 3 circulating water heat exchange pipe; 4, sealing the bottom end; 5, high-temperature coal coke powder; 6, cooling the coal coke powder; 7 cooling the fluidizing medium, 71 producing steam fluidizing medium; 8, a thermometer; 9 outlet fluidizing gas; 10 a flow meter; circulating water A, circulating water B after temperature rise, water supply for the steam production part C and steam D.
Detailed Description
The invention is further described with reference to the accompanying drawings and examples, which are only schematic illustrations of the method and are not intended to limit the practice thereof.
The first implementation mode comprises the following steps:
as shown in fig. 1-2, the method for utilizing the residual heat of the coal coke powder comprises a high-temperature steam generation and medium preheating part, the coal coke powder is cooled and the residual heat is utilized in a cooler 1, and the cooler 1 is provided with a steam generation part shell 14, a cooling medium preheating part shell 14-1 and a bottom end enclosure 4; high-temperature coal coke powder 5 firstly enters a steam production part 11 through a coal coke powder inlet pipe 111 to be fluidized, an evaporation pipe 2 is arranged in the steam production part 11, the high-temperature coal coke powder 5 transfers heat to a steam production part in the evaporation pipe through the evaporation pipe 2 to supply water C to produce steam D, and the coal coke powder which is subjected to heat release and temperature reduction of the steam production enters a cooling medium preheating part 12. The water-vapor mixture is directly subjected to water-vapor separation above the steam generating part 11, the water-vapor separator 13 and the steam generating part 12 are separated by a split tube plate or a partition plate 15, the evaporation tube 2 is connected to the split tube plate or the partition plate 15, as shown in fig. 2, the evaporation tube 2 is in a sleeve form and is vertically arranged and provided with an inner tube 22 and an outer tube 21 of the evaporation tube, water supply C for the steam generating part is introduced from a water supply inlet tube 131 of the steam generating part, enters the inner tube 22 from a top inlet, flows downwards to the bottom of the evaporation tube and turns to enter annular gaps of the inner tube and the outer tube, and steam D flows upwards into the water-vapor separator 13 in the annular gap between the inner tube 22 and the outer tube 21 of;
according to the invention, the cooling medium preheating part and the steam generating part can be designed into an integral structure or a split structure; in the present embodiment, the cooling medium preheating part 12 and the steam generating part 11 are integrated vertically, the cooling medium preheating part 12 is directly disposed at the lower part of the steam generating part 11 and is connected in series with the steam generating part 11 to form a whole, the coke powder of the steam generating part 11 directly settles and enters the cooling medium preheating part 12, and the cooling fluidizing medium 7 from the cooling fluidizing medium inlet pipe 122 fluidizes;
the cooling medium preheating part 12 is provided with circulating water heat exchange tubes 3, the circulating water heat exchange tubes 3 can be designed in various manners, in the embodiment, the circulating water heat exchange tubes 3 are grouped and directly enter and exit the cooling medium preheating part 12 through the bottom end socket 4, circulating water independently circulates in each group of heat exchange tubes respectively, coal coke powder transfers heat to circulating water A in the circulating water heat exchange tubes 3 through the circulating water heat exchange tubes 3, and the cooled coal coke powder 6 flows out from a coal coke powder outlet tube 121;
circulating water A enters the bottom of the cooling area 12 through a heat taking medium inlet pipe 123 of the preheating part of the cooling medium, and circulating water B after temperature rise flows out from the bottom of the preheating part of the cooling medium 12 through a heat taking medium outlet pipe 124 of the preheating part of the cooling medium; a flowmeter 10 is arranged on the cooling fluidizing medium inlet pipe 122 to control the coke powder cooling outlet thermometer 8, and the cooling fluidizing medium 7 flows out of the cooling medium preheating part 12 upwards and then enters the steam producing part 11 to continue fluidizing the coke powder of the steam producing part; supplementing the steam-producing fluidizing medium 71 to the steam-producing part through the steam-producing fluidizing medium inlet pipe 112, mixing the steam-producing fluidizing medium 71 with the cooling fluidizing medium 7 to fluidize the coal coke powder of the steam-producing part together, controlling the heat exchange of the steam-producing part 11, and enabling the outlet fluidizing gas 9 to flow out of the fluidizing gas outlet pipe 113;
the circulating water B heated in the circulating water A in the cooling medium preheating part 12 flows out of the cooling medium preheating part 12 and then enters the evaporation pipe 2 of the steam production part as the water supply C of the steam production part to continuously generate steam.
In specific implementation, a multi-channel partition plate can be further arranged between the steam production part 11 and the cooling medium preheating part 12, so that the coke powder in the steam production part 11 flows to the cooling medium preheating part 12 below through the channel partition plate, and the specific structural design of the channel partition plate can simultaneously realize the unidirectional flow of the coke powder and the cooling of the fluidizing medium to enter the steam production part, which can be completed by a person skilled in the art and is not described in detail herein.
The second embodiment:
as shown in FIG. 3, the method for utilizing the residual heat of the coke powder comprises a high-temperature steam generation part and a medium preheating part, wherein a cooling medium preheating part 12 is arranged outside a steam generation part 11, and a steam generation part shell 14 and a cooling medium preheating part shell 14-1 are arranged in a split structure; the cooled coal coke powder in the steam production part 11 enters the cooling medium preheating part 12 through the conveying pipe 114 for cooling;
circulating water heat exchange pipes 3 of the cooling medium preheating part 12 are grouped and directly enter and exit the cooling medium preheating part 12 through a bottom end enclosure 4; the cooling medium preheating section 12 is further provided with a second fluidizing gas discharge pipe 125; cooling fluidizing medium 7 enters the cooling medium preheating part 12, heat exchange of the cooling medium preheating part 12 is controlled, and outlet fluidizing gas 9 flows out of the second fluidizing gas outlet pipe 125; the steam-producing fluidizing medium 71 enters the steam-producing part 11 to control the heat exchange of the steam-producing part 11, and the outlet fluidizing gas 9 flows out from the fluidizing gas outlet pipe 113.
The rest structure is the same as the first embodiment.
Example 1
As shown in figure 1, in the method for utilizing the waste heat of the coal coke powder after the dry distillation of certain coal, the inlet temperature of the high-temperature coal coke powder is 600 ℃, the flow rate is 100t/h, and the outlet temperature is 150 ℃; the water supply of the steam generation part is to adopt circulating water (at 65 ℃) heated by the preheating part as a heat-taking medium, and 1.0MPa steam is generated for 25 t/h; the heat medium, namely circulating water, taken by the preheating part of the cooling medium adopts circulating water with the temperature of 32 ℃, and the temperature of the circulating water after heat exchange is 65 ℃. The fluidizing gas of the steam production part and the circulating water preheating part adopts nitrogen; the diameter of the main casing of the device is 2800mm and the total height is 20 m.
The high-temperature coal coke powder with the temperature of 600 ℃ firstly enters a steam production part, and exchanges heat with circulating water in an evaporation pipe under the action of steam flow, the coal coke powder after steam production enters a cooling medium preheating part and exchanges heat with the circulating water in a circulating water heat exchange pipe under the action of nitrogen flow, and the outlet temperature of the cooled coal coke powder is 150 ℃. The nitrogen dosage of the preheating part of the cooling medium is about 45Nm3Min, the steam consumption of the steam-producing part is about 30Nm3And/min, controlling the temperature of the coke powder by using the nitrogen of the preheating part of the cooling medium, and controlling the heat transfer of the steam producing area by enabling the nitrogen of the preheating part to go upwards to enter the steam producing area.
Claims (6)
1. A fluidized bed coal coke powder waste heat utilization method, the heat of the high-temperature coal coke powder (5) is utilized in grades, the high-temperature part is used for producing steam (D), the steam (D) is separated from water in a water-steam separator (13), the low-temperature part is used for heating circulating water (A); the high-temperature coal coke powder (5) firstly enters a steam production part (11), enters a cooling medium preheating part (12) after the heat release of the steam production lowers the temperature, and flows out after being cooled to the required temperature in the cooling medium preheating part (12); an evaporation pipe (2) is arranged in the steam production part (11), and the high-temperature coal coke powder (5) transfers heat to water (C) for the steam production part in the evaporation pipe (2) through the evaporation pipe (2) to generate steam; the cooling medium preheating part (12) is provided with a circulating water heat exchange pipe (3), circulating water (A) is arranged in the pipe, and coal coke powder is arranged outside the pipe; the steam production part (11) and the cooling medium preheating part (12) control the temperature and the steam production of the coke powder by fluidizing with a fluidizing medium; the method is characterized in that:
the cooling medium preheating part (12) and the steam production part (11) are integrated up and down, the cooling medium preheating part (12) is directly arranged at the lower part of the steam production part (11), and the coal coke powder of the steam production part (11) directly settles and enters the cooling medium preheating part (12); the cooling medium preheating part (12) is provided with a cooling fluidizing medium (7), and the cooling fluidizing medium (7) controls the cooling temperature of the coal coke powder in the cooling medium preheating part (12); the cooling fluidizing medium (7) flows out of the cooling medium preheating part (12) upwards and then enters the steam producing part (11) to continue fluidizing the coal coke powder of the steam producing part; when the steam-producing part (11) supplements the steam-producing fluidized medium (71), the steam-producing fluidized medium (71) and the cooling fluidized medium (7) are mixed together to fluidize the coke powder of the steam-producing part, and the heat exchange of the steam-producing part (11) is controlled; a multi-channel partition plate is arranged between the steam production part (11) and the cooling medium preheating part (12), one or more coke powder descending channels and a plurality of fluidized medium ascending channels are arranged on the multi-channel partition plate, so that the coke powder in the steam production part (11) flows to the cooling medium preheating part (12) below through the coke powder descending channels of the partition plate, and the cooling fluidized medium (7) in the cooling medium preheating part (12) enters the steam production part (11) through the ascending channels of the partition plate.
2. The method for utilizing the residual heat of the fluidized bed coke powder as claimed in claim 1, wherein the steam and water separation is directly carried out above the steam generating part (11), the steam and water separator (13) and the steam generating part (11) are separated by a split tube plate or a partition plate (15), the evaporating tube (2) is in a sleeve form and is provided with an inner tube (22) and an outer tube (21) of the evaporating tube, the outer tube (21) of the evaporating tube is vertically arranged, the outer tube (21) of the evaporating tube is connected to the split tube plate or the partition plate (15), the water supply (C) of the steam generating part enters the inner tube (22) from a top inlet and turns to enter annular gaps of the inner tube and the outer tube from the bottom of the evaporating tube, and the steam flows upwards into the steam separator (13) in the annular gap between the inner tube (22) and the outer tube (21) of.
3. The method for utilizing the residual heat of the fluidized bed coke powder as claimed in claim 1, wherein the circulating water of the cooling medium preheating part (12) is circulated in the following manner:
or the circulating water heat exchange tubes (3) are grouped and directly pass through the cooling medium preheating part shell (14-1) or the bottom end enclosure (4) to enter and exit the cooling medium preheating part (12); circulating water circulates independently in each group of circulating water heat exchange pipes respectively;
or a cooling tube plate or a partition plate is arranged at the bottom of the cooling medium preheating part (12), the lower end of the circulating water heat exchange tube (3) is connected to the cooling tube plate or the partition plate, a circulating water inlet and outlet is arranged on the part of the shell (14-1) of the cooling medium preheating part below the cooling tube plate or the partition plate or a bottom seal head (4), and circulating water circulates in the circulating water heat exchange tube (3) from the inlet and outlet;
or the circulating water heat exchange pipe (3) adopts an inner and outer sleeve form, and two pipe plates or clapboards, namely an upper pipe plate or clapboard and a lower pipe plate or clapboard, are arranged at the bottom of the cooling medium preheating part (12); the lower end of the inner tube of the heat exchange tube (3) is arranged on the lower tube plate, and the lower end of the outer tube is arranged on the upper tube plate; circulating water enters an annular gap between the outer pipe and the inner pipe at the bottom of the circulating water heat exchange pipe (3), flows upwards in the annular gap and is heated, turns to enter the inner pipe to flow downwards at the top of the circulating water heat exchange pipe (3), and flows out of the heat exchange pipe from the bottom of the inner pipe; a circulating water inlet is arranged at the part of the shell (14-1) of the preheating part of the cooling medium, which is positioned between the upper tube plate and the lower tube plate or the partition plate; and a circulating water outlet is arranged on the part of the shell (14-1) of the preheating part of the cooling medium, which is positioned below the lower tube plate or the partition plate, or the bottom seal head (4), and circulating water enters and exits the preheating part of the cooling medium from the inlet and the outlet.
4. The method for utilizing the residual heat of the coal coke powder in the fluidized bed according to claim 3, wherein the circulating water heat exchange tube (3) is in the form of an inner sleeve and an outer sleeve, a partition plate is arranged on an upper tube plate or a lower tube plate to divide the circulating water heat exchange tube (3) into 1 to 6 zones, 1 to 6 water inlets are arranged on a part of the cooling medium preheating part shell (14-1) between the upper tube plate and the lower tube plate, 1 to 6 water outlets are arranged on a part of the cooling medium preheating part shell (14-1) below the lower tube plate or a bottom end enclosure (4), and circulating water is circularly preheated in each zone independently.
5. The method for utilizing the residual heat of the coal coke powder in the fluidized bed as claimed in claim 1, wherein steam, nitrogen or flue gas containing less than 2% of oxygen is used as a fluidizing medium, and the fluidizing medium realizes fluidization and heat exchange of the coal coke powder, and simultaneously, coal tar gas carried by the coal coke powder flows out along with the fluidizing medium or returns to the dry distillation reactor, so that the yield of dry distillation products is improved, and the cooled coal coke powder is prevented from burning.
6. The method for utilizing the residual heat of the coke powder in the fluidized bed according to claim 1 or 5, wherein steam or flue gas is used as a fluidizing medium in the steam generating part (11), and nitrogen is used for fluidizing the coke powder before the coke powder cooled by the cooling medium preheating part (12) flows out of the outlet; or steam or flue gas is used as a fluidizing medium in the steam generating part (11) and the cooling medium preheating part (12), and nitrogen is used as the fluidizing medium before the coal coke powder flows out from the cooling medium preheating part (12) to replace the gas carried by the coal coke powder.
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| CN105879925A (en) * | 2016-05-09 | 2016-08-24 | 石宝珍 | Combined catalyst cooler |
| CN206279124U (en) * | 2016-12-23 | 2017-06-27 | 胜帮科技股份有限公司 | A kind of dry coke quenching system |
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| DE3404684C2 (en) * | 1984-02-10 | 1986-01-23 | Didier Engineering Gmbh, 4300 Essen | Process for utilizing the sensible heat generated when coke is dry-cooled by means of a gas |
| CN2217725Y (en) * | 1994-08-30 | 1996-01-17 | 中国石化洛阳石油化工工程公司 | External heating device with steam bag |
| CN1355396A (en) * | 2000-11-27 | 2002-06-26 | 中国石化集团洛阳石油化工工程公司设备研究所 | Vapour generator using afterheat of powder body |
| CN204220127U (en) * | 2014-10-08 | 2015-03-25 | 青岛京润石化工程有限公司 | A kind of tube-sheet type external warmer |
| CN106047379A (en) * | 2016-06-30 | 2016-10-26 | 中国重型机械研究院股份公司 | High-temperature powdered coke dry quenching system and method |
| CN206019399U (en) * | 2016-08-30 | 2017-03-15 | 扬州科润德机械有限公司 | A kind of powder cooler |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105879925A (en) * | 2016-05-09 | 2016-08-24 | 石宝珍 | Combined catalyst cooler |
| CN206279124U (en) * | 2016-12-23 | 2017-06-27 | 胜帮科技股份有限公司 | A kind of dry coke quenching system |
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