JPH02500752A - Method and device for cooling and dedusting high temperature coke - Google Patents

Abstract

A process for the cooling of and the removal of dust from high-temperature coke in at least two stages, whereby the coke is cooled in the first stage to less than about 800 DEG C. In this first cooling stage (1), the coke is cooled to a temperature of between 200 DEG and 800 DEG C, and preferably to between about 400 and 650 DEG C; it is then quickly and continuously drawn through a water bath (8), after which it is held in the steam-laden atmosphere of a sealed re-evaporation chamber (14).

Description

[Detailed description of the invention] Method and device for cooling and removing dust from high-temperature coke The present invention provides a method and apparatus for cooling and removing dust from high-temperature coke. Cooling the hot coke in at least two steps by cooling it to below about 800°C and a method for removing dust, and a method according to claim 8 for carrying out the method. The present invention relates to a device of the type having the characteristics described in the Concept.

German Patent Application No. 2,533,606 discloses that coke is cooled. A two-step process is described in which the coke is first closed in a t; Cool from 1100°C to about 315-425°C in a countercurrent using an inert gas in a container. cool and then close I; rinse the container with water and evaporate the water. The process consists of lowering the temperature of the rice cake to 95-150°C. In this case, coke As in conventional wet fire extinguishing under fire towers, steam rises and dust particles , therefore the waste gas must be purified before being released into the atmosphere.

Finally, from German Patent No. 3523897, coke cooling and the film layer method are known, which method uses coke in a coke dry cooling system of about 1 After exiting at a temperature of 50 to 200 °C, the liquid is placed in an immersion vessel with a liquid temperature of about 100 °C. Input and removal from the immersion container at infinitely controllable speed, removing fine dust at the same time. It consists of doing. In this case, the coke is also separated; the bleeder is also soaked. After leaving the soaking container, there is still significant evaporation and the container is partially released. may cause environmental pollution. Additionally, coke soaking times of less than 30 seconds In extremely short cases, complete intense heat exchange between the coke surface and the coke interior is possible. It cannot be done. Therefore, on subsequent conveying equipment, water absorption occurs near the surface. In the case of large coke pieces, which are confined to coke particles, heat exchange is resulting in evaporation. Thereby, the non-uniformity of different coke pieces with different sizes High moisture content may occur.

Always remove completely dry coke pieces when handling coke further; dust particles was found to be released and cause emission problems.

The object of the invention is a method for cooling and dedusting hot coke of the type mentioned at the outset. and the equipment for carrying out the method is free from environmental problems, especially dust problems when loading coke. is substantially eliminated, and the coke dry cooling process is further simplified with an inexpensive construction style. The aim is to improve the system so that it

In order to solve this problem, the structure of the method described in the characteristic part of claim 1 Claims 2 to 7 that feature requirements add important constituent features. . Claims 8 to 10 indicate constituent features of the device according to the invention.

According to the invention, the energy of the coke is partially utilized to a very small extent in the first step. , thereby generating lower pressure steam than in other known methods.

This is particularly important in coke industry installations, where: There is no possibility of releasing large amounts of high pressure steam to external consumers. Thereby, coke The dry cooling chamber itself can be constructed small and, in particular, with a significantly reduced overall height. Ko Of course, the temperature is the first step before immersion in water, and gasification progresses at an accelerated rate at high temperatures. The reaction is allowed to drop in such a way that it is sufficiently suppressed in the method according to the invention.

The hot coke is cooled in the first step preferably exclusively indirectly to about 600°C and cooled thereto. Heat removal is carried out by a cooling surface built into the shaft or by a continuously circulated hot coke stove. on the conveyor belt to a radiant cooling surface placed above or below the conveyor belt. . When cooling directly in countercurrent with a cooling gas, advantageously the amount and temperature of the cooling gas are controlled. Depending on the coke, the coke is optionally cooled to approximately 400°C. In case of normal temperature cooling The coke is rapidly heated with hot steam at about 120°C below 800°C, preferably at about 60°C. It can be cooled to 0-650°C, so no coke gasification takes place.

The steam taken out at about 500-600℃ is heated to high pressure in a coal preheating or waste heat boiler. It can be used to generate steam.

According to the proposal of the invention, the coke in the first step is from 200 to 400 g. Continuously cooled to the temperature mentioned at the beginning from 00 to 650 °C and then in a closed system. Supply into a dipping container. During this process, the coke is passed through a water bath for a short time; Due to the short residence time of coke within the coke, the coke fillet generally Complete heat exchange between the parts does not occur. Therefore, the coke will continue to be closed in the third step. After cooling, it is kept in an evaporation container. Here, inside the particle and on the particle surface within the coke deposit. During this intense heat exchange occurs, most of the water adhering to the surface evaporates and released. The intense heat exchange is facilitated by the generated water vapor, which The coke deposits can then flow through and also be guided into the circuit. lastly , the coke has a uniform temperature and a uniform moisture content (the moisture content is no longer present during subsequent loading). (or no change) and leaves the post-evaporation vessel. In particular, further processing of coke In this case, dust particles can no longer be dissipated, so that pine emissions are avoided. At that time is able to almost completely remove coke dust adhering to coke pieces and remove it together with cleaning water. Immersion times of less than 3 minutes, advantageously between 10 and 60 seconds, are sufficient for introduction into the clarifier. be. The attached coke dust is no longer transported into the subsequent evaporation vessel.

Maintaining the parameters as claimed in claim 4, the coke after leaving the post-evaporation vessel is It has a relatively low moisture content, which makes it suitable for later use in the blast furnace. After-steaming The temperature of the coke after leaving the blasting vessel is advantageously between 70 and 80°C, which is below the evaporation temperature. significantly lower than , thus also conveying the coke further on the open conveyor device In addition, when directly immersing the water It was found that vapor formation was relatively low. Water vapor can be easily removed from the closed container and Simply by introducing it into the raw gas refining side of the coke plant. It can be further processed. Already in the immersion container, the water volume is increased by constant watering. Most of the water vapor is condensed again over the entire surface of the vessel. This is true! ; Steam This is done using the existing water sprinkler system when introducing the water into the zone. always cold water By introducing cooled circulating water from the clarifier and the clarifier, the water temperature in the immersion vessel is reduced to approx. The coke is held at 60-80°C, so most of the heat within the coke is absorbed through the heating of water. Only a small amount of water vapor is generated.

Proposes an apparatus according to claim 8 for carrying out the method according to the invention; According to coke dry cooling shaft or hot coke conveyor belt coke The outlet and the immersion vessel as well as the subsequent post-evaporation vessel are each connected hermetically to each other. Therefore, no release occurs when the coke is transferred from one container to another. It can't be done. Prevents water vapor from flowing back from the dip vessel to the coke dry chiller In order to Dense coke deposits can be retained within the body and outflow hopper. Additionally, Shutoff valves can be used to deplete coke deposits and prevent water vapor from flowing back. can. However, according to the present invention, a coke removal device from a coke dry cooling device is provided. The installation can also be constructed without the use of conventional gate bunkers or airtight discharge gates. can do. In some cases, the discharge may be carried out using a non-airtight transport mechanism, e.g. can be limited to.

Attachment 1: A detailed description of the invention with reference to an exemplary embodiment schematically illustrated in the drawing.

The front chamber 19 in FIG. and the coke is continuously cooled through the coke supply port 2. Slide into shaft 1. Therefore, the coke is heated indirectly through the cooling wall 6 and/or directly into the cooling gas, which flows countercurrently through the connection 315 (solid line). arrow) or at normal temperature (dashed arrow) and discharged. In the latter case, the connection 3, hot steam at about 120°C is supplied for normal temperature cooling of the coke, and the water Steam is passed from the lower end of the cooling chamber under the exhaust locker 20 to the cooling gas suction device 5. It is taken out at a temperature of 00-600°C. After leaving the dry cooling zone, the coke The temperature within the coke outlet 4 is approximately 200 to 800°C based on the cooling method used each time. and continuously slides into the water bath in the dipping vessel 8 via the outflow hopper 9 and the filling pipe 7. Ru. In the filling pipe 7 and partly also in the outflow hopper 9, coke deposits are dammed up. and sufficiently prevent backflow of water vapor generated during coke cooling in the immersion vessel 8. Stop. The discharge rod cooled the flow of hot coke through the coke dry cooling shaft. When the valve 20 is controlled, even if the filling pipe 7 becomes empty, the shutoff valve 1 remains in the upper region. 7 is automatically closed by weight, for example. Residence time of coke in immersion water bath is guided around the direction changing roller 11 and preferably has a sheave-like shape. Depending on the speed of the coke conveyor 13, which is an apron conveyor with plates, Determined by Below the coke conveyor 13 is a scraper conveyor 18. The coke particles separated from the coke are conveyed to the drain port 16. . The coke is directly and airtightly connected to the dipping vessel 8 by the coke conveyor 13. The coke is then transported directly to the evaporation vessel 14, from which the coke is released automatically after a certain period of time. The coke outlet 15 is connected to the coke outlet 15 in a known manner, e.g. via a gate or packet wheel. It is taken out. at least above the point of entry of the coke into the water bath, but advantageously A spraying and watering device 12 is placed above the entire water surface, and cold cleaning is carried out through this device. Water as well as clear water cooled in the circuit are poured in. During coke cooling Most of the water vapor generated is recondensed by the water that is poured over it. condensation Not carried out: Water vapor is extracted from various places, in particular on the post-evaporation vessel 14. It can be removed for further processing via the device 10. To prevent corrosion It has been found to be advantageous to add lime or something similar to the immersion water bath for this purpose. I made it clear.

Reference sign list (1) Coke dry cooling shaft (2) Coke supply port (3) Cooling gas connection port (4) Coke discharge port (5) Cooling gas connection port (6) Cooling surface (7) Filling tube (8) Soaking container (9) Outflow hopper (10) Steam suction device (11) Direction changing roller (12) Watering device (13) Coke conveyor (14) Post-evaporation container (15) Coke discharge port (16) Water and coke particle outlet (17) Shutoff valve (18) Scraper conveyor (19) Anteroom (20) Outlet hook international search report international search report EP 8700693 SA 19757 Continuation of author page 1 Priority claim [Phase] November 8, 1986 [Phase] West Germany (DE) [Phase] P36 38166.7 [Phase] May 8, 1987 [Phase] West Germany (DE) [Phase] P37 15355.2 Founder Stahlhelm, Dieter Federal Republic of Germany 1st Mentor: Schumacher, Werner, Torstler, Federal Republic of Germany Se Inventor: Brinkmann, Vri Kuustraße, Federal Republic of Germany Special table Hei 2-500752 C5) 4350 Recklinghausen Drie Delve 4690 Herne am De Jungerbruch 211 4354 Tatstern Friedrich Ebel 1 4690 Herne Huon Bodelschwinn

Claims (10)

[Claims] 1. By cooling the coke to below 800°C in the first step, at least two In the method of cooling and dedusting high-temperature coke in the first step, the coke is Cooling to 0-800°C, preferably 400-650°C, followed by continuous short immersion. It is passed through an immersion bath and then kept in a water vapor atmosphere in an evaporite bath after closing. A method for cooling and removing dust from high-temperature coke. 2. The coke is cooled exclusively indirectly in the first step, preferably in a cooling shaft with an integrated cooling surface. Continuous with radiant cooling surfaces located within the conveyor belt or above or below the conveyor belt Claim 1, in which the coke is cooled to about 600°C on a hot coke conveying belt that circulates around the How to put it on. 3. Advantageously, the coke is heated directly in the first step to about 400°C by means of a gaseous refrigerant. 2. The method of claim 1, wherein the cooling is carried out countercurrently with water vapor to about 600 DEG -650 DEG C. 4. Residence time of the coke in the post-evaporation vessel is less than 30 minutes, preferably from 3 to 10 minutes and the coke is post-evaporated at a temperature of 40 to 80°C, preferably 70 to 80°C. The method according to any one of claims 1 to 3, in which the product is removed from a container. . 5. The water vapor extracted from the closed container during coke soaking in water is used in coke processing. further processing by introducing it into the raw gas production side of the field, advantageously into the raw gas main. , and supplying a corresponding amount of cold fresh water to the immersion vessel at all times, The method described in any one of items up to item 4. 6. A portion of the steam removed from the immersion vessel and/or the post-evaporation capacity is transferred to the post-evaporation vessel. 6. A method as claimed in claim 5, characterized in that the coke flows countercurrently through the coke. 7. Condensate containing coke particles continuously from the soaking vessel and/or post-evaporation vessel Alternatively, take out a portion of the waste water, thoroughly remove dust in a clarifier, and soak it in a clarifier. The method according to any one of claims 1 to 6, wherein the method is returned to a container. 8. An apparatus for carrying out the above method, comprising a coke supply port (2) at the top and a coke supply port (2) at the bottom. A type consisting of a coke dry cooling system with a coke discharge port (4) at the top. The coke outlet is connected via the filling pipe (7) immersed in the water of the immersion vessel (8). a gas-tight closed casing of the dipping container (8), and said dipping container being likewise gas-tight. for cooling and cooling the hot coke, characterized in that it is connected to a post-evaporation vessel (14); Equipment for removing dust and dust. 9. A shutoff valve (17) is provided at the lower end of the outflow hopper (9) or in the upper region of the filling pipe (7). provided that the shutoff valve is depleted of coke deposits in the region of the valve (17); 9. A device according to claim 8, wherein the device closes automatically when the device closes automatically. 10. The lower part ■ of the coke conveyor (13) circulating inside the dipping container (8) returns. located in the water bath together with the coke conveyor (13) and the feed side and return side of the coke conveyor (13). A sieve-shaped bottom is disposed between the sieve-shaped bottom and the separated container. of claims in which bare particles can fall through and settle to the bottom of the immersion vessel (8). The device according to scope item 9.