TW491888B - Method and apparatus for drying coal - Google Patents

Abstract

A method and apparatus for drying coal by fluidized bed dryer 7, using flue exhaust gas 31 of coke oven 1 as a portion or all of feed gas 34 to fluidized bed dryer 7, characterized in that exhaust gas 32 from fluidized bed dryer 7 is circulated through gas circulation pipe 21 and reused as feed gas 34 to fluidized bed dryer 7 when the supply of flue exhaust gas of coke oven 1 is interrupted or reduced. In the above method and apparatus, the amount of coal fed to fluidized bed 14 is reduced, and the exhaust gas from fluidized bed dryer 7 is circulated and reused as feed gas to the fluidized bed dryer when the supply of flue exhaust gas 31 from coke oven 1 is interrupted or reduced.

Description

491888

Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 491888 A7 _______________B7_________ — V. Description of the invention (2) Drying system, in which the sensible heat recovered by the coke oven (sensible ^ is called an organic heating medium that is heated and is circulated in heat conduction) In the pipeline, the pipeline is set up in a fluidized bed dryer, and at the same time, the combustion exhaust gas from the coke oven is injected into the fluidized bed dryer as hot gas. In a chamber-type coke oven, the coking chamber and combustion The chambers are staggered into a line, separated by a brick wall of about 100 mm thickness. The hot gas generated in the combustion chamber is transmitted through the brick wall to the coal in the coke oven. The array of combustion chambers is usually divided into 26 Up to 34 small chambers, one regenerator is arranged under each combustion chamber. The small chambers including the regenerators are divided into two groups. The first group of regenerators is heated at high temperature after the heat storage is completed, and the fuel gas and air are in the regenerators. The medium is preheated and then mixed with each other and burned in the upper chamber (upflow). Then, after combustion, the exhaust gas is sent down to the second group of chambers (downflow) ), S hot summer is taken out of the regenerator below the chamber and discharged through the flue. The temperature of the first group of regenerators is lowered by preheating the gas, and the temperature of the second group of regenerators is increased by thermal storage. After the predetermined time has elapsed, the functions of the first group are switched to the thermal storage side and the second group is switched to the combustion side. By repeatedly switching at predetermined time intervals, the preheating operation and the thermal storage operation are staggered to improve Regeneration efficiency. The state of the combustion chamber is staggered, and the operation from the combustion side to the downstream side or the opposite is referred to as the combustion shift as described above. The operation of supplying and stopping air and gas in the combustion shift room is explained according to FIG. 4 First, the gas supplied to the combustion chamber that is already on the combustion side (temporarily referred to as "A side") drops to zero within a specified time. Then, the amount of air used for combustion is reduced to zero within a specified time. .At this time, from the combustion chamber and the flow side (temporarily this standard applies the Chinese National Standard (CNS) A4 specification (210 X 297))-'~~ 5 ~:-— — — — — — — — — — IAW-ull · — — ^ -11111111 I (Please read the precautions on the back before filling out this page) 491888 491888 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 V. Description of Invention (3) — ~-Called B side) Regenerator Go to the flue search system, switch from open to closed. After that, the regenerator of "《burning chamber and" _ "(as of that time, it is still the burning side)," switch from closed to open "so that It is discharged into the flue. After the shortage, air is gradually introduced into the combustion chamber on the B side (which is still the downstream side by then), and finally, the introduction of the fuel gas is started. In the chamber-type coke oven, the combustion gas is changed as above This is done in a fixed period. During the transition period, 'as shown at the bottom of Figure 4, the flow of combustion exhaust gas from the kiln is interrupted, although only for a short time. In the coke-making | furnace, the flue gas is used as the feed gas of the fluidized bed dryer. In the traditional method, 'no precautions are given to overcome the interruption of the combustion gas during the above-mentioned combustion shift, and it is impossible to ensure the drying of coal. Stable operation. In addition, because the exhaust gas sent from the A fluidized bed dryer contains steam that is completely or almost saturated at high temperatures, there is a problem in that the condensation of the steam occurs due to the exhaust gas cooling in the exhaust pipe, and then dust on the downstream side of the pipe occurs. The filter cloth of the trap is clogged. Moreover, a sufficient volume of gas must be supplied to the fluidized bed dryer to fluidize the coal, regardless of the feed rate of the coal. Although, the exhaust gas from the coke oven is used as a relatively dry feed gas, it has a temperature above a certain degree to dry coal. As fluidized bed drying begins, coal feeds gradually increase. However, because the amount of feed gas is maintained above a certain level as described above, there is a problem that the coal is excessively dried when the coal feed rate is low. Brief description of the present invention The purpose of the present invention is to solve the above problems and dry the fluidized bed «^ --------- tr ---- (Please read the precautions on the back before filling this page)

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This paper size applies to Chinese National Standard (CNS) A4 (210 X 297 mm) 491888 A7 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 5. Description of the invention () The dryer uses the flue gas from the coke oven to dry coal In the present invention, a method and an apparatus for drying coal are provided, which can stably dry the coal, even during a combustion shift of a coke oven. & Another object of the present invention is to prevent smooth condensation of the exhaust gas discharged from the fluidized bed dryer. Another object of the present invention is to prevent excessive drying of coal at the initial stage of operation of the fluidized bed dryer. Another object of the present invention is to suppress the emission of fine coal from a fluidized bed dryer and improve coke quality. ... Ίπ The present invention is conceived to solve the above problems. The main points of the present invention are as follows: ⑴The method for drying coal uses a fluidized bed dryer to use the flue gas from the coke oven as the feed to the fluidized bed dryer. Part or all of the gas delivery is characterized in that when the supply of exhaust gas from the coke oven flue is interrupted or reduced, the exhaust gas from the fluidized bed dryer is recycled and reused as the fluidized bed dryer Feed gas. (2) The method for drying coal uses a fluidized bed dryer to use the flue gas from the coke oven as two or all of the fluidized bed dryers. It is characterized in that when it comes from a coke oven Flue waste = when the amount of coal sent to the fluidized bed should be interrupted or reduced, and the exhaust gas sent from the fluidized bed dryer is recycled and reused as the feed gas to the fluidized bed dryer . (3) The method for drying coal uses a fluidized bed dryer to use the flue gas from a coke oven as part or all of the feed gas to the fluidized bed dryer, which is characterized by ... When the supply of flue gas from the coke oven is interrupted or reduced, the amount of coal discharged from the fluidized bed and the size of the coal sent to the fluidized bed are suitable for the β-country standard (CNS) A4 standard ⑽χ297. Read the phonetic on the back? (Please fill in this page for matters) Install ----- r --- Order ----

ϋ ϋ ϋ I φ 491888 Printed by the Consumers ’Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 B7 V. Invention Description (5)-Carbon, both of which are reduced, and the exhaust gas discharged from the fluidized bed dryer is recycled and reused As a feed gas to the fluidized bed dryer, the thickness of the coal layer is maintained within a predetermined thickness in the fluidized bed. (4) The method for drying coal according to point (2) or (3), characterized in that the amount of coal fed into the fluidized bed is controlled so that when the supply of exhaust gas from the coke oven flue is interrupted or reduced The coal temperature at the outlet of the dryer is kept almost constant. 1 (5) The method for drying coal according to point (2) or (3), characterized in that the amount of coal fed into the fluidized bed is controlled such that the temperature of the feed gas sent to the fluidized bed and The difference between the gas temperatures at the outlet of the fluidized bed dryer falls within a predetermined range. (6) The method for drying coal according to the point (2) or (3), characterized in that when the supply of flue gas from the coke oven is continued, the flue gas of the coke oven is used as the fluidization The bed dryer is fed with gas, and the amount of coal sent to the fluidized bed is increased so that the temperature of the coal at the outlet of the dryer is maintained within a predetermined target range. (7) The method for drying coal according to point (6), characterized in that the amount of coal sent to the remote fluidized bed is increased so that the temperature of the feed gas sent to the fluidized bed and the fluidized bed The difference between the temperatures at the outlet of the dryer falls within a predetermined range. (8) The method for drying coal according to the point (1), (2) or (3), characterized in that the gas discharged from the fluidized bed dryer is circulated to be fed into the fluidized bed to dry Part or all of the gas path of the machine is thermally insulated, and part of the gas is heated. ^ ----- r I--tT --------- 1 (Please read the notes on the back before filling this page)

This paper size applies to China National Standard (CNS) A4 specifications (210 X 297 mm 491888) Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 V. Description of the invention ((9) Use according to the point (1), ⑵ or ⑶ The method for drying coal is characterized in that when the gas discharged from the fluidized bed dryer is circulated and reused as the feed gas to the fluidized bed dryer, a dust trap installed in the circulating gas passage is cleaned. For the purpose, the gas is blown in: and: The amount of gas corresponding to the increase in the amount of gas blown in is added to the amount of gas discharged outside. (10) Method for drying coal according to point (1), ⑵ or ⑶ , Characterized in that: before the supply of flue gas from the coke oven is interrupted or reduced, a warning signal is issued, and after the sequence of the signal, one or more of the following actions are taken: change to be recycled and reused as The exhaust gas amount of the feed gas of the fluidized bed dryer, 'changes the amount of coal sent to the fluidized bed, changes the amount of coal released from the fluidized bed, heats the circulating gas, and blows in the gas for cleaning Dust trap (11) The method for drying coal according to point (1), ⑵ or ⑶, characterized in that when the supply of flue gas from the coke oven is interrupted or reduced, the Hot gas is used as part of the feed gas to the fluidized bed dryer. (12) The method for drying coal uses a fluidized bed dryer to use the hot gas supplied by the hot gas generator, together with the gas from the coke oven. The flue gas exhaust gas, as the feed gas to the fluidized bed dryer, is characterized in that the paper size is controlled by the change of the supply volume of flue gas exhaust gas from the coke oven. (CNS) A4 specifications (2_1G x 297)

Aw Μ ----- r --- ^ --------- Aw 1 (Please read the notes on the back before filling out this page} Printed by A7, Consumer Cooperatives, Intellectual Property Bureau, Ministry of Economic Affairs --- ---- BL_____ 5. Description of the invention (^ Volume and / or temperature, the supply volume and temperature of the feed gas to the fluidized bed dryer are maintained at their respective predetermined target values. (13) According to the main point (1 ), (2), (3) or (12) method for drying coal, characterized in that one or both of the circulating gas sent to the fluidized bed dryer and the flue gas from the coke oven (14) The method for drying coal according to the points (ι), (2), (3) or (12), characterized in that a part of the feed gas is supplied to the fluidized bed One of the plenums, and at the same time, the remaining feed gas, at a point between the freeboard section of the dryer and the dust trap, is supplied to the exhaust gas sent by the dryer. 15) The method for drying coal uses a first-grade chemical bed dryer to use the flue gas from the coke oven as the purge gas for the fluidized bed dryer. It is characterized by the fact that the flue gas from two coke ovens with different combustion conversion timings is mixed and used as the feed gas to the fluidized bed dryer. ⑽ According to the points 要, ⑵, ⑶, ⑽ (15) The method for drying coal, characterized in that: at the initial stage of the operation of the fluidized bed dryer, the coal feed rate to the dryer is gradually increased, and at the same time, the feed gas is sent to the Dryer and add water to the fluidized bed. _ (Π) The method for drying coal according to the points ⑴, ⑵, ⑶, ⑽ or (15), characterized in that the flue gas from the coke oven and the free flow Both the circulating gas discharged from the fluidized bed dryer are used as the input body to the fluidized bed dryer. The consumption of the circulating gas is controlled according to the coal temperature measured at the outlet of the fluidized bed dryer. The gas volume is also at the same time. This standard is suitable for the Chinese National Standard (CNS) A4 specification (210 x 297 cm). ^ ^ --------- ^ --------- ^ (Please Read the notes on the back before filling this page) A7 -------- B7____ V. Description of Invention (8) " The coal temperature at the outlet of the fluidized bed dryer is controlled by the above three measures. (18) The method for drying coal according to points ⑴, ⑵, ⑶, (12) or (15), It is characterized in that both the flue gas from the coke oven and the circulating gas discharged from the fluidized bed dryer are used as the eaves gas to the fluidized bed dryer and the shield ring gas consumption according to the feed to the fluidized bed. The difference between the gas sending temperature and the gas temperature at the fluidized bed dryer outlet is controlled. The volume of gas taken out from the coke oven flue is also controlled at the same time, and the coal temperature at the fluidized bed dryer outlet is controlled by the above three Measures and stability. (19) The method for drying coal according to the points ⑴, ⑵, (3), (12), or (15) is characterized in that the fine coal contained in the gas discharged from the fluidized bed is separated by a solid-gas method Separated, the separated fine coal is mixed and stirred by an additive consisting of a liquid, the additive contains heavy hydrocarbons obtained from coal or gasoline, the mixed and stirred fine coal, together with a fluidized bed The coal dried by the dryer is used as the raw material sent to the coke oven. (20) The method for drying coal according to the points (1), (3), (3), (12) or (15) is characterized in that the fine coal contained in the gas discharged from the fluidized bed is solidified Separated by gas separation, the separated micro-gentle coal is mixed and stirred by an additive made of liquid, the additive contains heavy hydrocarbons obtained from coal or gasoline, and the mixed and disturbed fine coal is under pressure It is formed by a forming method, and the formed fine coal, together with the coal dried by a fluidized bed dryer, is used as a raw material sent to a coke oven. (21) Device for drying coal with a fluidized bed for drying coal. The paper size is applicable to China National Standard (CNS) A4 (210 X 297 mm) (Please read the precautions on the back before filling this page. ) ---------- Order ----- 镳 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 9

w ^ r --- ^ --------- (Please read the notes on the back before filling out this page) Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs

Α7 V. Description of the invention (Drying machine and the gas pipeline used to make the coke oven send the flue flue gas—partial or full gas is supplied to the fluidized bed dryer, which is characterized by containing. The gas discharged from the fluidized bed dryer is circulated and supplied back to the fluidized bed dryer, and the milk circulation system control H is used to control the supply order of the flue gas when the coke oven sends out When it is broken or reduced, the gas discharged from the fluidized bed dryer is recycled and reused as the feed gas to the fluidized bed dryer. (22) The device for drying coal has a stream for drying coal. A fluidized bed dryer and a gas pipeline for supplying a part or all of the flue gas exhausted from a coke oven to a fluidized bed dryer are characterized by comprising: a gas circulation pipeline 1 The gas discharged from the bed dryer is circulated and supplied back to the fluidized bed dryer, a gas circulation system controller for controlling the gas discharged from the fluidized bed dryer to be recycled and reused as the fluidized bed Feed air of dryer ， And ,,-the coal feed amount controller, the silk control makes the amount of coal sent to the fluidized bed decrease when the flue gas from the coke oven is interrupted or reduced. (23) The device for dry miscellaneous carbon has A fluidized bed dryer for drying coal and a gas line for supplying part or all of the flue exhaust gas from a coking oven to a fluidized bed dryer is characterized in that it includes: a gas circulation line for The gas discharged from the fluidized bed dryer is circulated and supplied back to the fluidized bed dryer, and the gas circulation system controller is used to control the gas discharged from the fluidized bed dryer to be recycled and reused. As the fluid bed dryer

This paper size applies the Chinese National Standard (CNS) A4 specification (21 × χ 297 mm 491888, printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs, printed A7. 5. Description of the invention () Send gas, a controller for controlling the amount of coal released So that when the supply of flue gas from the coke oven is interrupted or reduced, the coal bed thickness of the fluidized bed is maintained by reducing the amount of coal released from the fluidized bed. (24) According to the point (22) or (23) The device for drying coal is characterized in that the amount of gas fed into the fluidized bed is controlled so that when the supply of flue gas from the coke oven is interrupted or reduced, the temperature of the coal at the outlet of the dryer is (25) The device for drying coal according to the point (22) or (23) is characterized in that the amount of coal sent to the fluidized bed is controlled so that the feed to the fluidized bed The difference between the gas temperature and the gas temperature at the outlet of the fluidized bed dryer falls within a predetermined range. (26) The device for drying coal according to the point (22) or (23) is characterized by: When the coke oven sends out When the supply of flue gas is continued, the gas circulation system controller is used to control, so that the flue gas from the coke oven is used as the feed gas to the fluidized bed dryer, and the coal feed controller is It is used to increase the amount of coal sent to the fluidized bed so that the temperature of the coal at the outlet of the dryer is maintained within a predetermined temperature range. (27) The device for drying coal according to the point (26) is characterized in that The amount of coal fed to the fluidized bed is increased so that the difference between the temperature of the gas fed to the fluidized bed and the temperature of the gas at the outlet of the fluidized bed dryer falls within a predetermined range. (28) The device for drying coal according to the point (21), (22) or (23), characterized in that the gas exhausted from the fluidized bed dryer and will be fed ^ --- -Order ---------. Γ% Please read the notes on the back before filling in this page}

This paper is suitable for the national standard (CNS) A4 specification of the rich country (210 X 297). 491888

V. Description of the Invention (Part or all of the circulation gas path printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs to the fluidized bed dryer is thermally insulated, and the heating device is provided to heat part of the gas. (29) The device for drying coal according to the point (21), (22), or (23) is characterized in that when the gas discharged from the fluidized bed dryer is circulated and reused as an inlet to the fluidized bed dryer When sending gas, the gas cleaning controller of the dust trap set in the circulating gas path is used to blow in the gas for cleaning purposes. A dryer exhaust gas controller is used to control the The amount of gas corresponding to the increased amount of gas is added to the amount of gas discharged to the outside. (30) The device for drying coal according to the point (21), (22), or (23) includes: a cigarette pack 'to The gas discharged from the fluidized bed dryer is released to the outside, and an exhaust gas pipeline is used to transfer the gas discharged from the fluidized bed dryer to the smoke and smoke. The first control valve is arranged on a gas pipeline. To make the coke oven Part or all of the flue gas sent out is supplied to the fluidized bed dryer, and a controller for the first control valve and a second control valve are arranged on the exhaust pipe, and are used to bite The controller of the second control valve, the third control valve is arranged on the gas circulation pipeline, and the controller for the third control valve; and the control is performed when the fluidized bed dryer is discharged When the exhaust gas is circulated and reused as the feed gas to the fluidized bed dryer, it is used for the first paper size of this paper to apply Chinese National Standard (CNS) A4 specification (210 X 297 mm) ---- ------- Installation -----: ---- Order --------- I (Please read the notes on the back before filling this page) A7 V. Invention Description (12 Control The controller of the valve is closed. The first controller is closed, the second control valve is made of the “lean valve” and the control valve for the third control valve is used to open the third control valve. (3D according to the points ⑵) , (22) or (23) The device for drying coal is characterized in that the section of the The device that sends out the signal before, follows the sequence of the signal, the gas circulation system controller, the coal feed amount controller, '" Hai 2 release! Controller, the heating device, the dust trap The gas / month office control, and the controller for the first to the third control valve, perform one or more of the following actions: 〇 change is recycled and used as the to the fluidized bed dryer The amount of exhaust gas fed into the gas changes the amount of coal sent to the fluidized bed, changes the amount of coal discharged from the fluidized bed, heats the circulating gas, and blows in the gas to clean the dust trap. Zhou Shi briefly said that for drying coal The general schematic of the system. Figure 1 is based on the present invention --------- Order --------- (Please read the precautions on the back before filling out this page) Intellectual Property Bureau of the Ministry of Economic Affairs The second drawing of the employee consumer cooperative printing chart is a partial schematic diagram of the system used in accordance with this publication. Fig. 3 is a partial schematic view of a system for drying coal having a dust collector equipped with a heating device according to the present invention. Fig. 4 shows the post-transition state of the combustion gas system of the coke oven.

Dry coal equipped with a hot gas generator J This paper is scaled to the Chinese national standard ⑽χ 297 公 复 τ 491888 Printed by the Consumers ’Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 5. Formulation of the invention (formula 3) Figure 5 shows the invention Diagram of the control state of the first example. Fig. 6 is a diagram showing the control state of the second example of the present invention. Fig. 7 is a diagram of the control state of the third example of the present invention. Fig. 8 is a diagram showing the control state. In the fourth embodiment of the invention, a diagram of the transition state of the flue gas from the coke oven. Preferred Embodiments The embodiments of the present invention are described below based on Figures 1 to 4. The combustion exhaust gas generated in the coke oven 1 is in After passing through the flue 2, it is released to the atmosphere through the soot 4 of the coke oven 1. The temperature of the combustion exhaust gas passing through the flue 2 is 150C to 250 ° C, and the coke oven produces about 10,000t / day (60t / h (Wet) coal release rate), the volume of combustion exhaust gas is about 60,000m3 / h. Coal is fed from the coal feeder 15 to the fluidized bed dryer 7, and when the gas 34 is fed from the lower dispersion plate 14, the hot gas Blown in and fed to dryer The coal forms a fluidized bed 13, and the gas flows upward through the dispersion plate 14. The moisture contained in the coal is dried in the fluidized bed 13, and after the coal is adjusted to a predetermined temperature and a predetermined moisture content, the coal is removed from the flow. The fluidized bed dryer 7 is released. According to the present invention, the exhaust gas from the coke oven 1 is supplied to the fluidized bed dryer 7 through the gas pipe 8 and the blower 12 branched out of the coke oven flue 2. From > The exhaust gas 32 released from the chemical bed dryer 7 is released to the atmosphere through smoke after being captured by dust 16 and blower 18 through exhaust pipe 17. A bag filter can be used as dust capture Collector 丨 6. Cyclone dust collector is also applicable, but because the cyclone dust collector cannot separate and capture fine coal with a particle size of about 20 μm, the bag filter has the paper size suitable for China Standard (CNS) A4 specification (210 X 297 mm) ^ ---------- ^ --------- (Please read the notes on the back before filling this page) 491888 Ministry of Economic Affairs A7 printed by the Intellectual Property Bureau's Consumer Cooperatives V. Invention Description (1, Temple Car Moreover, it is possible to circulate the exhaust gas M of the fluidized bed dryer 7 through the gas circulation line 21 branched from the exhaust gas line 17 and reuse the exhaust gas as the feed gas 34 of the fluidized bed dryer. The exhaust gas from the coking oven, the exhaust gas flow meter 5 and the control valve 6, which are used to control the coke m flue pressure T, are arranged in the coke oven flue 2. The flow meter 9 and the No.-control valve group On the gas line 8, the second control valve 19 is arranged on the exhaust gas line 17, and the third control valve is arranged on the gas still ring line 21. Because the volume of the exhaust gas can be estimated by combustion calculation Out 'so the exhaust gas flow meter 5 is not necessary. The openings and flow rates of control valves Nos.-3 can be adjusted by the respective controllers (26_28). Moreover, the coal feed rate of the coal feeder 15 is controlled by the coal feed rate controller, and the coal release rate from the fluidized bed dryer is controlled by the coal release rate controller 25. The gas circulation system controller 23 can control the circulating gas by giving the control finger + to the controller for the first, third, and third control valves. The hot gas generated by the hot gas generator 11 (Fig. 2) can be used as part of the feed gas for the fluidized bed dryer 7. The exhaust gas from the coke oven or the circulating gas used as the feed gas for the fluidized bed dryer 7 is not only directly supplied to the fluidized bed dryer 7, but also used as a hot gas generator 丨 as the feed gas. The coke oven 1 usually has two combustion gas systems. By switching from one system to another after a predetermined combustion time has elapsed, combustion is always maintained in one of the two systems. This change is usually every 15 to 30 minutes. During the transition of the combustion gas system, the combustion gas flow using the system up to that time (System a) is gradually reduced to the top row shown in Figure 4. When the flow is reduced to zero, 'from then (System b) is used The combustion gas flow rate of the system gradually increases β installed --------- Order --------- * (Please read the precautions on the back before filling this page)

This paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm) 491888 A7 V. Description of the invention (plus. For this reason, the exhaust gas flow rate from the coke oven is reduced to zero, and then again during the combustion shift Increased. The time required for combustion conversion is generally 2 to 3 minutes. In the method using the flue gas from the coke oven as the feed gas for the fluidized bed dryer 7, the coke oven sends the exhaust gas as the feed gas Is interrupted during the combustion conversion of the coke oven 1. With the present invention, when the supply of flue gas from the coke oven is interrupted or reduced, the gas released from the fluidized bed dryer 7 is circulated through the gas circulation line 21 In order to use the feed gas of the fluidized bed dryer again. This procedure is described in particular according to Figures 1 to 4. The third control valve 22 set in the gas circulation line 21 is kept closed during stable operation Or slightly open to control the temperature of the coal at the outlet of the dryer. If the temperature of the flue gas from the coke oven 1 is too high during stable operation, mix a small amount of the colder Circulating gas is effective to reduce the gas temperature, and when the humidity of the fed coal fluctuates irregularly, the circulating gas can also be used to control the drying capacity. At the beginning of the combustion conversion of the coke oven 1, the third control valve 22 starts from A closed position or a slightly open position, opened to a certain degree. Thereby, a recirculation flow of the circulating gas 33 through the gas circulation line 21 by the blowers 12 and 18 is established. When the circulating gas 33 is ensured at a prescribed flow rate, The first control valve 10 gradually closed, and as a result, the amount of flue gas exhausted from the coke oven to the fluidized bed was gradually reduced, and the amount of the exhaust gas flowing to the chimney 4 increased. The first said that the control valve 10 The valve actuating speed is not necessarily fixed, and must be determined according to the operating conditions of the coke oven, because the amount of combustion exhaust gas varies according to the operating rate of the coking oven 1 or its combustion condition. The Chinese paper standard applies to China Standard (CNS) A4 Specifications (210 X 297 male *) (Please read the precautions on the back before filling out this page) Install ----- ^ --- Order ---- IIII 1. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 164 91888 A7 V. Description of the invention () When the gas is circulated through the gas circulation pipe 21, it is also acceptable to open the second control valve 22 and close the second control valve. The dream prevents this during the gas circulation, The phenomenon that gas flows from the chimney 20 back to the gas circulation pipe ^ occurs. The first to third control valves can be controlled by the respective controllers (26-28) based on the instructions from the gas circulation system controller U. Of course It is possible to combine the gas circulation system controller 23 with a part or all of the controllers for the first to third control valves to form a control unit. Alternatively, the controllers for the control valves may be integrated into the respective The control valve for changing the feed gas of the fluidized bed dryer 7 during the combustion conversion of the coke oven 1 may be started when a signal from the coke oven combustion conversion start is received, or according to the flue gas exhaust flow rate The change in the flow rate of the flue gas measured by the meter 5 and the like started. It is better to receive a warning signal from the coke oven i and start the change control of the feed gas for the fluidized bed dryer according to the warning signal in a specific period before the combustion shift starts, as shown in the middle of FIG. 4 And shown in the bottom row. Before the exhaust gas flow of the flue becomes zero, for example, a warning signal is received, the gas recirculation through the gas circulation pipe 21 is started, and the warning signal is started. In this way, it is possible to avoid the shortage of the feed gas for the fluidized bed dryer 7 due to the delay in the start of the gas cycle. Because the circulating gas 33 used during the combustion conversion of the coke oven 1 has been used to dry the coal of the fluidized bed dryer 7, its temperature is of course lower than that of the flue gas from the coke oven, and its humidity content is high. As a result, its coal drying capacity tends to be lower than that of flue gas from coke ovens. By using the present invention, in the use of private paper standard national standard (cKs) A4 specifications (210 x 297 public love (please read the precautions on the back before filling this page) -install ----- r --- tl- -------- Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs (), when the gas is circulating, by reducing the coal feed rate to the fluidized bed dryer 7 of the fluidized bed dryer 7 The drying degree of the coal discharged from the chemical bed dryer 7 can be maintained. The injection rate is controlled here, so that the temperature of the coal on the rotating side of the dryer is kept better. The content can be: about-fixed. This result comes from the fact that although the coal temperature on the dryer side of the dryer can be measured correctly, a stable online (.n-line) measurement of the coal clarity content is Difficult. Preferably, the coal thermometer 30 is arranged near the outlet of the fluidized area. Insert it into the coal layer, as shown in the first icon No. 3Ga at the right of the coal releaser 37 at the outlet of the fluidized bed. Above 'or as shown in the first icon number 30b, it is just below the release coal unloading pipe, which is acceptable. During the use of circulating gas, the feed rate of coal to the fluidized bed 13 can also be controlled, so that the difference between the temperature of the feed gas to the fluidized bed and the gas temperature at the outlet of the fluidized bed dryer 'falls within a predetermined range. Within the range. Because the amount of gas supplied to the fluidized bed is kept approximately constant in order to maintain the fluidization condition, the difference between the feed gas temperature and the dryer outlet is changed proportional to the heat transferred from the gas to the coal per unit time. Therefore, by controlling the coal feed rate, so that the above-mentioned heat falls within a predetermined range, it is possible to keep the coal moisture content of the dryer's conveying side within a target range. When reducing to a fluidized bed dryer as described above When the coal feed rate of 7 is better, it is better to keep the coal bed thickness of the fluidized bed 13 constant by reducing the coal release rate of the fluidized bed dryer 7 at the same time. This reason is that if the fluidized bed The coal release rate of the dryer remains unchanged without reduction. As a result, the amount of coal remaining in the w-bed dryer is reduced, and the coal layer in the fluidized bed is thinned. 491888 Intellectual Property Bureau, Ministry of Economic Affairs Printed by Employee Consumer Cooperative

f ---------- ^ --------- (Please read the notes on the back before filling out this page) A7 V. Description of the invention (1 may cause the flow in the fluidized bed 13 The pressure drop in the coal region is reduced, so the fluidization (leakage) cannot be stabilized. Because the time required for the combustion shift of the coke oven is only about 2 to 3 minutes, the time during which the fluidized bed dryer uses the recirculated gas The period is also =. Therefore, although the coal drying capacity of gas is secreted due to the gas feeding cycle during this period, by reducing the coal feeding, a considerable degree of coal quality can be preserved after drying, and the above-mentioned coal can be reduced. Release rate and reduction of dry coal production due to reduced coal feed rate. When the combustion shift at the coke oven is complete and the flow rate of flue gas from the coke oven returns to normal, use flue gas to feed into the fluidization The bed dryer 7 becomes possible. While maintaining the volume of the gas sent to the fluidized bed dryer 7 to be approximately constant, by opening the first control valve 10 (which is closed during the combustion shift) and the second control valve 19 'Fume exhaust is attracted as fluid bed drying Feed gas of 7. Because the coal drying capacity of the feed gas increases with the change of gas, the coal feed rate to the fluidized bed increases, so that the temperature of the coal discharged from the fluidized bed dryer 7 is controlled. Within a predetermined target range. By this, the gas changing operation is completed while controlling the fishery content of the coal discharged from the fluidized bed dryer 7 to the respective targets. It is also acceptable to increase the coal feed to the fluidized bed The feed rate, therefore, the difference between the temperature of the feed gas used in the fluidized bed and the gas temperature at the exit of the fluidized bed dryer falls within a predetermined range.-Regarding the refining f and furnace combustion conversion, the Control of the feed gas to the fluidized bed dryer, the operation can be changed according to the predetermined pattern of the volume of the reused circulating gas and the coal feed rate to the fluidized bed dryer.

Specifications of this button _ t @ @ Specifications (210_ 297 mm) 19491888 A7 Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs of the People's Republic of China (5) Invention Description (This control method can be effectively used, especially when it is sent to the fluidizer When coal shows a small degree of fluctuation in humidity. "To maintain the feed for the fluidized bed dryer during gas recirculation II: Two Γ capacity as high as possible 'is better to keep the feed The gas was sent and the dish was exhausted to the ground, ⑤, but not to the extent that the quality of charcoal was impaired. With the present invention, it is possible to maintain the coal drying ability of the recycled gas by the following means: by applying heat insulation to the radon from the fluidized bed The part of the exhaust pipe 17 exiting the dryer 7 toward the branch point of the gas circulation pipe 21, the dust trap 16 and the surface of the gas circulation pipe 21 exposed to morale; Circuit (by steam) or set up heating device 29 (using electric heaters or high-temperature gas, etc.) to heat some or all of the above-mentioned thermal insulation parts, so that the heat loss is as small as possible. In the example of the gas pipeline, the Made of heat-insulating material It is possible to reduce heat loss by insulating them. Fig. 3 shows a case where the heating device 29 is installed in the dust trap 16. When a bag filter is used as the dust trap 16, a gas blowing operation is sometimes performed. In order to remove the dust of the filter cloth of the bag filter, such as reverse air blowing or pulse blowing of air or nitrogen to the filter cloth. The present invention allows the above-mentioned period to release the gas equivalent to the gas blowing during the gas recirculation. The amount of gas outside the system (through the chimney 27 in Figure 1), the method of blowing the gas to the dust trap. The coal drying capacity can be increased because the dust trap for the clean gas is mixed with the recycled gas, The humidity of the recirculated gas is reduced. As mentioned above, it is also possible to use the hot gas generated by the hot gas generator U, together with the flue gas from the coke oven, as the feed gas for the fluidized bed dryer 7. The paper dimensions apply to Chinese national standards ( CNS) A4 size (210 X 297 male shame)

LI ^ --------- t --------- I (Please read the notes on the back before filling in this page) 491888 A7 --------- B7 2〇 '--- ------ V. Description of the invention () --- Body. When the gas is recirculated due to the combustion conversion of the coke oven, the coal drying capacity of the feed gas for the fluidized bed dry inorganic 7 can be maintained by increasing the temperature and flow of the gas generated by the heat generator η. In addition to the method of mixing the hot gas generated by H 11 with the recirculated gas as shown in the second figure, it is also possible to raise the temperature of the recirculated gas itself and use the recirculated gas as shown in FIG. 2 (b). As the feed gas of the hot gas generator. In the case where the flue gas from the coke oven and the hot gas from the hot gas generator u are used as the feed gas for the fluidized bed dryer 7, when the flow and heat of the flue gas is decreased during the combustion shift, etc., By increasing the heat of the hot gas supplied to the hot gas generator 11, it is possible to maintain the coal-avoiding drying capacity for the fluidized bed dryer 7. In this case, it is possible to maintain the normal operation of the fluidized bed dryer by controlling the supply volume and temperature of the hot gas sent from the hot gas generator ^ after the flue gas exhaust supply, So that the supply volume and temperature of the feed gas for the fluidized bed dryer 7 are maintained at respective predetermined target values. It is also possible to increase the temperature of the flue gas by supplying the flue gas to the hot gas generator 11 for heating. As a result of drying the coal in the fluidized bed 13, the humidity of the gas sent to the fluidized bed dryer 7 increases. While the gas passes from the fluidized bed dryer 7 until it is released to the atmosphere through the dust trap 16 through the chimney 20, the temperature of the gas decreases as the heat of the gas is lost to the surrounding environment. When the gas temperature drops to or below the dew point temperature, condensation will occur. Condensation wets the filter cloth of the bag filter (commonly used in the dust trap 16), causing the filter cloth to become clogged. By the invention, when a part of the flue gas sent from the coke oven is supplied, the paper size is applicable to the Chinese National Standard (CNS) A4 specification (210 X 297 mm) (Please read the precautions on the back before filling this page) -III l · III ^ «— — — — — — — I — 1 · T5 printed by the Consumers’ Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs. When the fluidized inorganic 7 is drying coal, another-part of the flue gas from the coke oven may be added to the stream at the freeboard height section ^ of the grabbed bed dryer 7 and the dust trap ^ between the points. In the exhaust gas sent from the chemical bed dryer 7. Because the flue waste milk is hot and its clarity is low, the temperature of the exhaust gas mixed with the flue gas is increased and the seat is low, so that condensation in the exhaust system can be prevented. As a result, the filter cloth of the bag transitioner can also be prevented from clogging. The coke manufacturing process generally includes several coke ovens. In each coke oven, the timing of the combustion change is simultaneous. However, the timing of the combustion change can be different Is there a coke oven? According to the present invention, the timing of the combustion conversion of one coke oven is different from that of the other coke oven, and the flue gas from two coke ovens with different job conversion timings are mixed to form a feed for the fluidized bed dryer 7. By this, during the combustion conversion of one coke oven, the flue gas from the other coke oven can be increased, so that the interruption of the feed gas for the fluidized bed dryer 7 can be avoided, so that the fluidized bed dryer 7 Continuous and stable operation is possible. As necessary, first, to dry the coal at the fluidized bed 13 at the beginning of the operation of the fluidized bed dryer 7, a sufficient amount of feed gas is supplied to the fluidized bed 13 and the coal The feed rate is gradually increasing. When the flue gas from the coke oven is used as the feed gas, the temperature of the feed gas is always high regardless of the operating condition of the fluidized bed dryer 7. For this reason, in When the coal feed rate is very low at the beginning of the operation, the coal is over-dried, resulting in a lower-than-predetermined coal. When the coal is over-dried, coal is present after it is released from the dryer. Danger of charcoal dust emission or fire. 491888 Α7 ------- Β7 22 '~ ------- — V. Description of the invention () With the present invention, by adding water to the flow in the early stage of operation Increasing the coal exhaustion in the fluidized bed 13 and gradually increasing the coal feed rate can maintain a constant humidity content of the coal exhausted from the dryer and prevent excessive drying in the initial stage of operation of the fluidized bed dryer 7. More specifically In other words, water is added to the fluidized bed 13 during the initial stage of coal feeding until a stable fluidized state (the pressure loss of the coal seam becomes approximately constant or reaches a predetermined range) is established, corresponding to the stability The humidity of the coal is dried and sensible during operation (sensible "called the amount of heat required for ascent. Water can be sprayed in the form of a mist to the fluidized coal bed, or to the freeboard height near the outlet of the fluidized bed" One or both of the sections, where there is an upward exhaust gas flow and the coarse-grained coal moves to the release outlet. The volatility of the coal sent to the chemical bed dryer 7 is not always constant, and sometimes varies with Time changes. Therefore, when the coal feed rate is maintained, the humidity content of the coal released from the dryer outlet must be maintained by changing the coal drying capacity of the dryer. Meanwhile, in order to maintain a constant fluidization condition of the fluidized bed, it is necessary to maintain a constant flow rate of the feed gas for the fluidized bed dryer 7. For this reason, the change in the moisture content of the fed coal must be overcome by changing the drying capacity of the coal by changing the temperature of the fed gas. . According to the present invention, the preparation gas from the coke oven is used as the feed gas of the fluidized bed dryer, however, the flue gas temperature is determined by the operation of the coke oven, even if the humidity content of the feed coal changes, its immutable. By means of the present invention, not only when the supply of flue gas from the coke oven is interrupted or reduced, but also in a stable operating state, from a fluidized bed dryer (please read the precautions on the back before filling this page). ---- r --- Order --------- Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs

A7 V. Description of the Invention (Release-Part of the gas is circulated as the feed gas of the fluidized bed dryer. The amount of circulating gas is based on the coal temperature measured at the outlet of the fluidized bed. The milk output from the controller 戍 m ^ is also controlled at the same time. The temperature of the coal that is used to output σ can be stabilized by the above action. When the moisture content of the feed coal of the dryer 7 increases, if the feed gas If the body temperature f stays the same, the drying capacity becomes insufficient, and the coal temperature X at the outlet of the dryer will decrease. Therefore, if the temperature of the coal at the outlet is measured to decrease, the drying capacity of the incoming gas can be reduced by reducing the reuse cycle. The gas volume and the gas volume 3 taken out of the coke oven to increase the strength " Conversely, if the feed content of the feed coal is reduced and the feed gas temperature remains unchanged, the drying capacity becomes excessive, so the drying The coal at the exit of the machine rises. Therefore, the coal drying capacity of the feed gas can be reduced by taking the opposite action to that used in the case of increasing the coal's wort content. With the above control action, even when the feed is sent to the dryer 7 The change in the clarity content of coal may also maintain the constant temperature and humidity of the coal released from the dryer outlet. The above-mentioned control of the volume of recycled gas and the volume of gas taken out of the coke oven flue can also be used according to The difference between the temperature of the feed gas in the fluidized bed and the gas temperature at the outlet of the fluidized bed. Because the gas supply rate to the fluidized bed is maintained to maintain the fluidized state, the printing is generally maintained by the employee consumer cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs Certainly, so the feed gas temperature and the gas temperature at the outlet of the dryer change in proportion to the amount of heat transferred from the gas to the coal per unit time. Therefore, by controlling the volume of recirculated gas and coke oven flue gas based on the above heat Take out the volume, it is possible to keep the temperature and humidity of the coal released from the dryer outlet. The fluidized bed dryer 7 can classify the coal when drying the coal. • The paper size of the fluidized bed is subject to Chinese National Standards (CNS). A4 specification (210 X 297 mm) 24 A7 V. Description of the invention Coal I's small particle size and fine coal are taken to the outside of the dryer by the upward airflow along with the exhaust gas. The straw can be controlled by the specially set upward airflow speed to control the fine coal particle size range taken away by the air. Contained in the exhaust gas The fine coal is captured by the dust trap 16 and classified as fine coal. The fine coal taken away by the gas released from the mechanical bed is separated by a solid-gas separation method, and the separated fine coal and heavy coal are separated. Hydrocarbon (taken from coal or petroleum) liquid additives are mixed and stirred_ the fine coal that has been dropped together with the fluidized bed dryer mentioned above is used as the raw material for coal. The added amount of the above additives is better The ground is 3-25 parts by weight of fine coal. The reason is that if less than 3 of the above ratio is added, it is difficult to uniformly dry the fine coal, but if it exceeds 25, the additive is added. The tar content may form a localized liquid, or coal may stick to components of the transfer system during transfer to the coke oven. " Because the fine particles of coal are removed from the coal discharged from the fluidized bed dryer 7 through the above procedure, the emission of dust during the transfer to the coke oven is very small. In addition, because the recovered fine coal is mixed and formed by a mixer, it can be used as a raw material for coke ovens without causing dust emission. "/ As mentioned above, the fine coal can be formed under pressure after being mixed and stirred by the mixer. In this way, the fine coal can be changed into shaped coals of any size and shape, and the coal that has been formed into particles like particles can be prevented from being crushed As a result, dust is generated. In addition, when the formed coal is loaded into the coke oven, the bulk density of the loaded coal is increased, and the quality of coke can be improved. This paper standard is applicable to Yin State National Standard (CNS) A4 specification (210 X 297 public love)

4 ^ ---- l · —tr --------- φ «. (Please read the notes on the back before filling out this page) 491888 Printed by A7, Consumer Cooperatives, Intellectual Property Bureau, Ministry of Economic Affairs, V. Invention Description (Examples) Some embodiments of the present invention are described below according to the figure. The present invention is applied to a coal drying operation using a fluidized bed dryer in order to reduce the moisture content of coal in coke production from to. Discussion The coke oven in the middle contains 100 coking chambers, that is, two and a half coke ovens, each with 50 coking chambers. The fluidized bed dryer dries the coal sent to the coke oven, and its (wet) coal treatment The capacity is 100t / h. The flue gas from the coke oven is used as the feed gas for the fluidized bed dryer. The temperature of the coke oven gas is 22 (rc and the flue gas volume is half of the coke oven). It is 82,000Nm3 / h. From the flue gas volume of the coke oven mentioned above, take out 65,000Nm3 / h from the flue 2 to the gas line 8 and enter the fluidized bed dryer 7. During normal operation, the The second control valve 19 is set to open 60% to maintain a stable control range. At the same time, the third control valve 22 is set to open 5%, in order to pass from the pipeline 17 through the gas circulation pipeline 21 to the drier exhaust gas. The 65,000Nm3 / h The coke oven flue gas and the 7,000 Nm3 / h circulating gas totaling a gas volume of 68,000 NmVh taken out of 72,000 Nm3 / h were used as fluidized bed drying. Feed gas to machine 7. The remaining 4,000 Nm3 / h is mixed with the waste from the fluid bed dryer at a point between the freeboard height of the dryer 7: section and the dust trap 16 and the waste is £ 32. The steam pipe with a diameter of about 10mm is arranged to meander around the funnel part below the bag filter, and is covered with heat insulation material as the heat insulation of the exhaust gas 32 of the fluidized bed dryer. Because in the above case, Dry coal, coal temperature at the exit of the dryer ^ ----- r --- ^ --------- Aw I (Please read the notes on the back before filling this page) Intellectual Property Bureau of the Ministry of Economic Affairs Printed by employee consumer cooperative A7 ----- JB7_______ V. Invention description (1 degree is about 52. (:, is controlled within the target temperature range of 50t: to 55t: In the dryer, the target coal humidity of 6% of the dryer outlet was reached, and the humidity was reduced by about 4% in the dryer. In these examples, 'combustion of the coke oven when the coke oven is operated at an output of 100 t / h The frequency of the shift is set at 30 mi η, although the shift frequency can be as short as 15 minutes when the output is high. (Example 1) During the combustion shift, the control of the feed gas for the fluidized bed dryer is explained according to Figures 4 and 5. As follows: One minute before the start of the combustion shift, the coke oven issued a warning number k. At the start of the combustion shift, as shown in Fig. 4, the combustion gas-side gas shut-off operation of the combustion side of the system A is first started so as to reach a full shutdown within 15 seconds. Then the closing operation of the 'combustion air' is started to reach a complete shutdown within 15 seconds. After 4 seconds of complete shutdown, the system b becomes the combustion side, and the air on the combustion side begins to be introduced to reach a normal level within 15 seconds, and then the flue gas starts to be introduced to reach a normal gas flow within 15 seconds. The changes in the flue gas flow of the coke oven over time are shown in the bottom row of Figure 4 and the top row of Figure 5. The controllers 23 to 28 of the fluidized bed dryer start to control the valve upon receiving the warning signal of the above-mentioned combustion change. The control day is described below based on Figure 5. First, the No. 1 control valve 10 is gradually closed from opening 55% to finally opening 5%. At the same time, the third control valve 22 is opened from 5% to 40%, and the second control valve 19 is closed from 60% to 40%. Due to the operation of the above valve, the paper size from the fluidized bed dryer exhaust gas 32 is applicable to the Chinese National Standard (CNS) A4 specification (210x297 mm) -29-IP I --------- ^ --- -(Please read the precautions on the back before filling this page) Φ Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 491888 A7 ---________ B7___ V. Description of the invention (1 60, OOONm / h circulates through the gas circulation pipeline 21 At the same time, the flow of the feed gas 34 to the fluidized bed dryer is set at%, the fineness is 3 / h, the ratio is 0.00Nm3 / h, and 5.6 '/ h is fed by the material. The gas 34.4% of the shoulder is mixed with the-point between the freeboard height section of the fluidized bed dryer exhaust gas 32 纟 dryer and the dust trap a. In addition to the above, when using a still gas, go to The coal feed rate of the dryer is reduced by 15% from normal operation to 85 t / h. The above sequence made by the valve and the adjustment of the coal feed rate are performed, following a prescribed pattern based on a warning signal for combustion conversion. When the combustion shift is completed, the plutonium operation is the reverse of the situation from the beginning of the combustion shift, and then after completing these plutonium operations, The coal feed rate returned to the normal position. The air from the atmosphere is used for pulse injection to remove dust from the bag filter. This operation usually requires 7 NmVh of air. During the above combustion conversion of the coke oven, The air flow is increased to 35 Nm3 / h. Even when the supply of flue gas from the coke oven is interrupted during the changeover of the coke oven, the recirculation of the gas is readable and guaranteed for the advancement of the fluidized bed dryer 7 And maintain the fluidization of the fluidized bed. Moreover, by reducing the coal feed rate to the fluidized bed during the combustion shift, inadequate drying of the coal is minimized. Once released, the L-bed dryer 7 releases The temperature of the exhaust gas is reduced to about 50 ° C, and the gas contains fine coal with a particle size of less than 0.1mm at about 5t / h. Although the exhaust gas content is 25%, it is not in a bag filter. The clogging spear of the filter cloth will occur S ', so fine coal with a size of several micrometers will be captured, and because part of the fluid in the fluidized bed dryer is fed with gas, it will be compared with the dry paper size + Guan Jia Standard (CNS) A4 specification (210 X 297 male shame) ^ ----- -------------! (Please read the notes on the back before filling this page)

· Equipment ·· --- Order ---------! C Please read the notes on the back before filling out this page) Printed by the Employees' Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 491888 A7 ------- -E__ 5. Description of the invention (1 " " ~ '^-The exhaust gas is mixed at the height section of the dry boat, and the funnel part below the bag type device is heated by steam and covered with thermal insulation material, so the exhaust gas It can be released to the atmosphere under further processing in the plant. Eighty percent of the fine dust that is not collected by the bag filter is fine coal with a particle size of less than 0.1mm. Tar is added as an additive. The temperature of the tar is maintained at About 8 ° C to reduce its viscosity and keep it liquid: and 10-15 parts of coke is added to 100 parts of fine coal. Then, by stirring the mixture, a granular-like The fine coal is loaded into the coking oven together with the coal discharged from the fluidized bed dryer 7. The fine coal like two grains shows less dust emission. (Example 2) Follow the control mode shown in FIG. 6 to control Operations are performed to adjust the combustion shift during the coke oven. The flow of circulating gas keeps the flow of the feed gas 34 for the fluidized bed dryer constant and keeps the coal feed rate at 100t / h. Other conditions remain the same as in Example 1. Because of the feed gas for the dryer The flow of 34 is maintained "定 ， #" to keep the fluidized state of the fluidized bed when the coal feed rate is kept constant. Because the coal feed rate is kept constant during the use of the circulating gas, it is released by the dryer The humidity of coal has risen to some extent. However, since the period of use of the circulating gas is as short as less than 2min, the production of coal with higher humidity content is controlled to about 3t, and the increase in coal humidity is as small as From ⑽ small to 7% under normal operation. (Example 3) Follow the control mode shown in Figure 7 during the combustion conversion period of the coke oven

This paper size applies to China National Standard (CNS) A4 (210 X 297 cm)

The printing room of the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs was adjusted to 68,000 Nm3 / h by the flow of% 33 gas, and the combustion exhaust gas (separated by the hot gas generator) heated to 28 ° C was flowed at a flow rate of 10,0. 〇〇NmVh is used as _ part of the feed gas, only when the circulating gas is used. The total flow of the feed gas 34 for the fluidized bed dryer is kept constant, and the coal feed rate is kept constant at 100 t / h. The other conditions remain the same as in example i. Because the gas sent from the hot gas generator is used extra, the breakable feed gas has sufficient coal drying capacity, so the humidity of the released coal is kept the same when the same coal feed rate is maintained during normal operation Humidity for normal operation. (Example 4) The feed gas for the dryer was used to ensure the use of the flue gas from two coke ovens from two furnaces (East furnace and West furnace) with different combustion shift timing during the uplift operation. Exhaust gas from the furnace and increase the supply volume of exhaust gas sent from one furnace during the combustion shift of another furnace. The control mode is shown in Figure 8. During normal operation, the flue gas volume of either the Cambodian furnace or the western furnace is 100,000 _3 / 11. A volume of 40,000 _3 /} 1 of exhaust gas from each coke oven is used as the feed gas to the dryer during normal operation. At the combustion shift time of the east furnace (12:30), the gas supply rate from the west furnace was increased to 80,000 Nm3 / h to ensure the feed gas for the dryer. Conversely, at the time of the combustion change of the West furnace (丨 2:45), the gas supply rate from the East furnace was increased to 80,000 NmVh, and the feed gas for the dryer was ensured in the same way. National Standard (CNS) A4 Specification (210 X 297 mm) · Meaning _ Pack -----; ---- Order --------- 1 (Please read the note on the back first? Matters (Fill in this page again) 30491888 Printed A7 by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 5. Description of the Invention () By this way, 'due to the flue gas from the coke oven (with constant maintenance of drying capacity) is used as a relatively dry feed Gas, so stable coal drying operation is ensured. With the present invention, by using the exhaust gas from the fluidized bed dryer as the feed for the fluidized bed dryer when the flue gas supply from the coke oven is interrupted or reduced due to reasons such as the combustion shift of the coke oven, Gas, it is always possible to ensure that as much feed gas as is required for the fluid bed dryer. By insulating the gas circulation path and arranging heating devices such as steam or electric heaters to part or all of the above-mentioned thermal insulation section, the coal drying ability of the recirculating rolled body can be kept high. Coal drying capacity can be improved by blowing in gas during the gas recirculation to clean the dust trap, because the gas used to clean the dust trap is mixed into the recirculated gas. By supplying the flue gas from the coke oven to the exhaust gas from the fluidized bed dryer, condensation of humidity in the exhaust gas path is prevented from occurring. By mixing the flue gas from the coke oven with different combustion timing and using the mixed gas to send to the fluidized bed dryer, the interruption of the feed gas for the fluidized bed dryer can be avoided, so the flow Continuous stable operation of a fluidized bed dryer is possible. By adding water to the fluidized bed coal and gradually increasing the coal feed rate at the beginning of the operation of the fluidized bed dryer, the fishery content of the coal discharged from the dryer is kept constant to prevent over-drying from occurring, even in During the start. By adding additives to the fine paper size carried by the exhaust gas sent out from the fluidized bed, the Chinese national standard (CNS) A4 specification (210 X 297 public hair is issued — — — — — — — — — --- 41 ^ pack- --- ^ ---- Order -------- I (Please read the notes on the back before filling this page) 491888

31 V. Description of the invention (In coal anorexia, stirring and then pressing fine coal and additives to form pressure, the fine coal can be converted into coke oven raw materials and used together with coal dried by a fluidized bed dryer. Consumption by employees of the Intellectual Property Bureau of the Ministry of Economic Affairs Cooperative printed 1. Coking oven 4. Chimney 6. Control valve 8. Gas line 10 ... Control valve 12 ... Fan 14. Dispersion plate 16 ... Dust trap 18. .. blower 20 ... chimney 22 ... control valve 24 ... coal feed rate controller 26-28 ... controller 3 0 ... coal anaerobic thermometer 33 ... circulating gas 1 i ticket number 釾 照 袅 2 ... Flue 5 ... Waste gas flow meter 7. Fluid bed dryer 9 ... Flow meter 11 ... Hot gas generator 13 ... Fluid bed 15 ... Coal feeder 17 ... Exhaust line 19 ··· Control valve 21 ... Gas circulation line 23 ... Gas circulation system controller 25 ... Coal release rate controller 29 ... Heating device 32 ... Exhaust gas 34 ... Feed gas This paper size applies to Chinese national standards (CNS ) A4 size (210 X 297 mm) -From: ----------- install ----- r --- order --------- I (Please read the back first Notice (Please fill this page again)

Claims (1)

Patent No. 89116655 patent application & > (Please read the precautions on the back before filling out this page) 累 Ming tired Shenjing patent snake enclosure amendment amendment date: December 1990 1. A kind of dry «char The method is to use a fluidized bed to dry the job, and use the flue gas sent from the refining seam as part or all of the incoming gas to the fluidized bed dryer, which is characterized by: #from coke oven flue waste I When the supply of gas is interrupted or reduced, the exhaust gas from the fluidized bed dryer is recycled and reused as feed gas to the fluidized bed dryer. • Order · 2 · —A method for drying coal. By using a fluidized bed dryer, the flue gas from a coke oven is used as part or all of the feed gas to the fluidized bed dryer. Its characteristics The reason is that when the supply of exhaust gas from the coke oven flue is interrupted or reduced, the amount of coal sent to the fluidized bed is reduced, and the exhaust gas sent from the fluidized bed dryer is recycled and reused as the fluidized bed. Feed gas to the dryer. 3. A method for drying coal. By using a fluidized bed dryer, the flue gas from a coke oven is used as part or all of the feed gas to the fluidized bed dryer, which is characterized by ... When the supply of exhaust gas from the coke oven flue is interrupted or reduced, both the amount of coal discharged from the fluidized bed and the amount of coal fed into the fluidized bed are reduced, and the exhaust gas discharged from the fluidized bed dryer is recycled. And reuse as the feed gas to the fluidized bed dryer in order to maintain the thickness of the coal layer in the fluidized bed within a predetermined thickness. 4. The method for drying coal as described in item 2 or 3 of the scope of patent application, where: the amount of coal fed to the fluidized bed is controlled so that 3 5 · This paper size applies the Chinese National Standard (CNS) A4 specification ( 210X297 mm) 491888 A8 B8 C8 ----------__--. 6. Scope of patent application-When the supply of flue gas from the coke oven is interrupted or reduced, the coal temperature at the outlet of the injection dryer is Keep it almost certain. 5. The method for drying coal according to item 2 or 3 of the scope of patent application, wherein the amount of coal fed to the fluidized bed is controlled so that the temperature of the feed gas sent to the fluidized bed and the fluidized bed The difference between the gas temperatures at the outlet of the dryer falls within a predetermined range. 6. The method for drying coal according to item 2 or 3 of the patent application scope, wherein: when the supply of flue gas from the coke oven continues, the flue gas of the coke oven is used to dry the fluidized bed The machine's feed gas' and the amount of coal sent to the fluidized bed were increased so that the temperature of the coal at the outlet of the dryer was kept within a predetermined target range. 7. The method for drying coal according to item 6 of the patent application, wherein the amount of coal sent to the fluidized bed is increased so that the temperature of the feed gas sent to the fluidized bed and the fluidized bed are dried The difference between the temperatures of the machine outlets falls within a predetermined range. 8. The method for drying coal as claimed in claim 1, 2 or 3, wherein: one of the gas discharged from the fluidized bed dryer and the gas that is circulated to be fed into the fluidized bed dryer Part or all of the pathways are thermally insulated, and part of the gas is heated. 9. The method for drying coal according to item 1, 2, or 3 of the scope of patent application, wherein: when the gas discharged from the fluidized bed dryer is circulated and reused as the feed gas to the fluidized bed dryer _____; _ -36- This paper size applies to China National Standard (CNS) A4 (210 X 297). Packing ..... (Please read the precautions on the back before filling this page) Order A8 B8 ^ ___ C8 — ---__ D8 6. When applying ^ ϋ ---, for the purpose of cleaning the dust catcher set in the circulation gas path, the gas is blown in, and it is added to the gas added by the blown gas The corresponding amount of gas is added to the amount of gas discharged outside. 1．If the application for drying coal in the scope of patent application No. 1, 2 or 3, where: the supply of flue gas from the coke oven is interrupted or reduced, a warning # is issued, and according to the After the sequence of the signals, one or more of the following actions are taken: changing the amount of exhaust gas that is recycled and reused as the feed gas to the fluidized bed dryer, changing the amount of coal sent to the fluidized bed, The amount of coal released from the fluidized bed, the circulating gas is heated, and the gas is blown in to clean the dust trap. 11. The method for drying coal according to the scope of the patent application No. 丨, 2 or 3, wherein: when the supply of flue gas from the coke oven is interrupted or reduced, the hot gas supplied by the hot gas generator is thrown as Part of the feed gas to the fluidized bed dryer. 12. · A method for drying coal, using a fluidized bed dryer, using the hot gas supplied by a hot gas generator, together with flue gas from a coke oven, as the feed gas to the fluidized bed dryer, It is characterized in that by controlling the volume and / or temperature of the hot gas according to the change in the supply volume of flue gas from the coke oven, the supply volume of the feed gas to the fluidized bed dryer and _____- 37- Paper size applies to China National Standard (CNS) A4 (210 X 297 mm) (Please read the precautions on the back before filling this page) 491888 A8 B8 C8 ----------- D8 ^ _ VI. Patent application scope Temperature 'is maintained at the respective predetermined target values. 13. The method for throwing dry coal as claimed in item 1, 2, 3, or 12, wherein: one or both of the circulating gas sent to the fluidized bed dryer and the flue gas from the coke oven. The person is heated.丨 4. If the method for drying coal in the scope of patent application No. 1, 2, 3 or 12 is used, 'A part of the feed gas is supplied to one of the gasification chambers of the fluidized bed, while the other The feed gas is supplied to a point between the freeboard height section of the dryer and the dust trap to the exhaust gas sent from the dryer. 15. A method for drying coal. By using a first-class chemical bed dryer, the flue gas from a coke oven is used as part or all of the feed gas to the fluidized bed dryer, which is characterized by: The flue gases of two coke ovens with different combustion shift timings are mixed and used as feed gas to the fluidized bed dryer. I6. If the method for drying coal is applied for items 1, 2, 3, 12 or 15 in the scope of patent application, wherein: at the initial stage of operation of the fluidized bed dryer, the coal feed rate to the dryer is gradually Increase while feeding the feed gas to the dryer and adding water to the fluidized bed. 17. · The method for drying coal if the scope of patent application is No. 1, 2, 3, 12 or 15, in which: flue waste from coke oven ---------- 3 8-paper size Applicable to China National Standard (CNS) A4 (21〇297297) (Please read the precautions on the back before filling this page) 491888 A8 B8 C8 D8 6. Scope of patent application (please read the precautions on the back before filling this page). Both gas and circulating gas discharged from the fluidized bed dryer are used as the feed gas to the fluidized bed dryer. The circulating gas consumption is controlled according to the coal temperature measured at the outlet of the fluidized bed dryer. The volume of gas taken out of the coke oven flue is also controlled at the same time, and the coal temperature at the outlet of the fluidized bed dryer is controlled by the above three. Measures and stability. 18. For the method for drying coal as claimed in item 1, 2, 3, 12 or 15, in which both the flue gas from the coke oven and the circulating gas discharged from the fluidized bed dryer are used As circulating gas to the fluidized bed dryer, the circulating gas consumption is controlled according to the difference between the temperature of the feed gas to the fluidized bed and the temperature of the gas at the outlet of the fluidized bed dryer. The volume is also controlled at the same time, and the coal temperature at the outlet of the fluidized bed dryer is stabilized by the above three measures. 19. For the method for drying coal in the scope of patent application No. 1, 2, 3, 12 or 15, in which the fine coal contained in the gas discharged from the fluidized bed is separated by the solid-gas separation method, the The separated fine coal is mixed and stirred by a liquid-containing additive containing heavy hydrocarbons obtained from coal or gasoline, the mixed and stirred fine coal, together with the coal dried by a fluidized bed dryer , Is used as the raw material sent to the coke oven. -39- This paper size applies Chinese National Standard (CNS) A4 specification (210X297 mm) 491888 A8 B8 C8 D8 6. Application for patent scope 20. If the scope of patent application for item 1, 2, 3, 12 or 15 is used for Method for drying coal, wherein fine coal contained in the gas discharged from the fluidized bed is separated by a solid-gas separation method, and the separated fine coal is mixed and mixed with a liquid-containing additive, and the mixture is added. The material contains heavy hydrocarbons obtained from coal or gasoline. The mixed and stirred fine coal is formed by pressure forming. The formed fine coal, together with the coal dried by a fluidized bed dryer, is used as a feed. Raw materials for coke oven. 21. —A device for drying coal, having a fluidized bed dryer for drying coal and a gas line for supplying a part or all of flue gas from a coke oven to a fluidized bed dryer It is characterized by comprising: a gas circulation line for circulating and supplying the gas discharged from the fluidized bed dryer to the fluidized bed dryer, and a gas circulation system controller for controlling the When the supply of flue gas from the coke oven is interrupted or reduced, the gas discharged from the fluidized bed dryer is circulated and reused as the feed gas to the fluidized bed dryer. 22. —A device for drying coal, having a fluidized bed dryer for drying coal and a gas line for supplying a part or all of flue gas from a coke oven to a fluidized bed dryer , Which is characterized by: __- 40-This paper size applies to Chinese National Standard (CNS) A4 (210 X 297 mm) (Please read the precautions on the back before filling this page) Order — 491888 A8 B8 C8 D8 VI Scope of patent application (please read the precautions on the back before filling out this page) A gas circulation pipeline, which is used to circulate and supply the gas discharged from the fluidized bed dryer back to the fluidized bed dryer, A gas circulation system controller for controlling the gas discharged from the fluidized bed dryer to be recycled and reused as the feed gas to the fluidized bed dryer, and a coal feed amount controller for controlling the When the flue gas from the coke oven is interrupted or reduced, the amount of coal sent to the fluidized bed is reduced. 23. —A device for drying coal, which has a fluidized bed dryer for drying coal and a gas line for supplying part or all of the flue gas from the coke oven to the fluidized bed dryer. It is characterized by comprising: a gas circulation road for circulating and supplying the gas discharged from the fluidized bed dryer to the fluidized bed dryer, and a gas circulation system controller for controlling The gas discharged from the fluidized bed dryer is recycled and reused as the feed gas to the fluidized bed dryer. A coal release controller is used to control when the supply of flue gas from the coking oven is interrupted or By reducing the amount of coal released from the fluidized bed, the thickness of the coal bed in the fluidized bed is maintained. 2 4. If the application for the drying of coal in item 22 or 23 of the scope of the patent application, where: the amount of gas sent to the fluidized bed is controlled, _____- 41-This paper size applies to China National Standard (CNS) A4 specifications (210 X 297 directors) Α8 Β8 C8 ---- ----- D8 one by one-so that when the supply of flue gas from the coke oven is interrupted or reduced, the coal temperature at the outlet of the dryer is maintained Almost certainly. 25. If the device for drying coal is applied for item 22 or 23 of the scope of the patent application, of which, the amount of coal sent to the fluidized bed is controlled so that the temperature of the feed gas to the fluidized bed and the fluidized bed The difference between the gas temperatures at the outlet of the bed dryer falls within a predetermined range. 26. If the scope of application for patent scope 22 or 23 is used for drying coal, 'where: when the supply of flue gas from the coke oven is continued', the gas circulation system controller is used to control the The flue gas is used as the feed gas to the fluidized bed dryer, and the coal feed controller is used to increase the amount of coal sent to the fluidized bed, so that the coal temperature at the outlet of the dryer is Keep within the predetermined temperature range. 27. For the device for drying coal such as the scope of application for patent No. 26, wherein the amount of coal fed to the fluidized bed is increased so that the temperature of the gas fed to the fluidized bed and the fluidized bed dryer The difference between the gas temperatures of the outlets falls within a predetermined range. 28. The device for drying coal such as the scope of patent application No. 21, 22 or 23, wherein: the gas exhausted from the fluidized bed dryer and the path of the circulating gas to be fed to the fluidized bed dryer A part or all of it is thermally insulated, and a heating device is provided to heat a part of the gas. --------: ___- 4.2-This paper size applies to China National Standard (CNS) A4 (210X297 mm) (Please read the precautions on the back before filling this page). Order — 491888 A8 B8 C8 D8 VI. Scope of patent application (please read the precautions on the back before filling this page) 29. If you apply for a device for drying coal in the scope of patent application No. 21, 22 or 23, of which: when discharged from the fluidized bed dryer When the gas is circulated and reused as the feed gas to the fluidized bed dryer, the gas cleaning controller of the dust trap set in the circulation gas path is used to blow in the gas for cleaning purposes. The dryer exhaust gas controller is used to control such that the amount of gas corresponding to the amount of gas added by the blowing gas is added to the amount of gas discharged to the outside. 30. The device for drying coal as claimed in the scope of patent application No. 21, 22 or 23 includes: a soot to release the gas discharged from the fluidized bed dryer to the outside, and an exhaust pipe for The gas discharged from the fluidized bed dryer is transmitted to the soot, and the No. 1 control valve is arranged on a gas pipeline so that part or all of the flue gas from the coke oven is supplied to the fluidized bed. Dryer, and a controller for the first control valve, a second control valve, are arranged on the exhaust pipe, and a controller for the second control valve, the third control valve, the group It is set on the gas circulation pipeline, and the controller for the third control valve; and control so that when the exhaust gas discharged by the fluidized bed dryer is __ ^ _- 4 3-This paper size applies Chinese national standards (CNS) A4 specification (210X297 mm) 491888 A8 B8 C8 _ D8 6. When the patent application scope is circulated and reused as the feed gas to the fluidized bed dryer, it is the controller for the first control valve Close the first control valve The controller of the second control valve closes the second control valve, and the controller for the third control valve opens the third control valve. 31. If the device for drying coal is applied for in the scope of patent application No. 21, 22, or 23, where the coke oven has a device that sends a signal before the supply of flue gas from the coke oven is interrupted or reduced, follow the The sequence of the warning signal, the gas circulation system controller, the coal feed amount controller, the coal release amount controller, the heating device, the dust trap controller, and the gas cleaning controller The controller to the third control valve performs one or more of the following actions: changes the amount of exhaust gas that is circulated and used as the feed gas to the fluidized bed dryer, and changes the coal sent to the fluidized bed Volume, changing the amount of coal discharged from the fluidized bed, heating the circulating gas, and blowing in the gas to clean the dust trap. This paper size applies Chinese national standard (CNS> A4 specification (21〇 > < 297 male purple) 4 4-(Please read the precautions on the back before filling this page)