CN219570168U - Raw coke oven gas waste heat recycling device - Google Patents

Abstract

The utility model discloses a raw coke oven gas waste heat recycling device which comprises a rising pipe and a waste heat recoverer, wherein the waste heat recoverer comprises a dust removing box and a heat absorbing box, a plurality of dust removing plates are arranged in the dust removing box, a dust scraping mechanism is arranged on each dust removing plate, a steam heater is arranged at the top of the dust removing box, a water tank is arranged below the dust removing box, a liquid inlet pipe communicated with the steam heater is arranged on the water tank, a plurality of heat absorbing pipes are arranged between the steam heater and the dust removing box at equal intervals in a penetrating way, a heat accumulating component is arranged on the heat absorbing pipe in the heat absorbing box, a driving mechanism for driving the heat accumulating component to synchronously rotate is arranged below the heat absorbing box, an impeller is arranged at the upper part in the steam heater, a generator connected with the impeller in a transmission way, and a steam discharging pipe is arranged at the top of the steam heater. The device not only can realize dust removal and oil removal treatment on raw gas and solve the problems of coking and oil hanging of a dust removal plate, but also has higher heat recovery rate.

Description

Raw coke oven gas waste heat recycling device

Technical Field

The utility model belongs to the technical field of clean coking, and particularly relates to a device for recycling waste heat of raw gas of a coke oven.

Background

In the coke production process, the blended coal is heated and distilled in a coke oven by isolating air, so that a large amount of raw coke gas is generated at the same time. The average temperature of the coke oven raw gas leaving the carbonization chamber is 650-850 ℃, and the coke oven raw gas carries about 35% of the heat of the coke oven, and the direct discharge of the coke oven raw gas not only pollutes the environment, but also wastes huge heat energy carried by the coke oven raw gas, so that the waste heat in the coke oven raw gas rising pipe is required to be recycled. At present, the raw gas sensible heat recovery process technology mainly comprises a raw gas flow system and a steam-water flow system, wherein the raw gas flow system mainly comprises the working principle that high-temperature raw gas with the temperature of 650-850 ℃ is used as a main byproduct of coal carbonization, the raw gas escapes from a carbonization chamber and enters a coke oven riser evaporator, indirect heat exchange is carried out between the raw gas and a steam-water heat exchange medium, the temperature is reduced to about 500 ℃ and then enters a bridge pipe through a three-way pipe, ammonia water is sprayed in the bridge pipe for rapid cooling, then the ammonia water is cooled and collected through a gas collecting pipe and then enters a chemical production recovery system, the purification treatment process is carried out, the working principle of the steam-water flow system is that desalted water is sent into a deaerator for deaeration through a deaeration feed pump and then sent into a steam drum for separation, the deaeration water and the raw gas are sent into a water inlet of the riser evaporator through a forced circulation pump for indirect heat exchange, so that the generated saturated steam is sent into the steam drum again for steam-water separation, and meanwhile, the saturated steam can be sent into a riser 'secondary superheater' for carrying out a overheat reaction, so that high-quality superheated steam is generated, and then user steam is merged into. The raw gas flow system has the following defects in the using process: firstly, because the raw gas contains a large amount of tar, dust and other impurities, during the use process, the ascending tube evaporator can produce coking, oil hanging and other phenomena, the heat exchange efficiency can be influenced, and a better heat recovery effect can not be realized. Therefore, the device for recycling the waste heat of the raw coke oven gas, which has reasonable structure, low cost, remarkable purifying effect and remarkable heat recovery rate, is objectively required.

Disclosure of Invention

The utility model aims to provide a coke oven raw gas waste heat recycling device which is reasonable in structure, low in cost, remarkable in purifying effect and remarkable in heat energy recovery rate.

The utility model aims at realizing the purposes, the device comprises a rising pipe and a waste heat recoverer connected with the top of the rising pipe, wherein the waste heat recoverer comprises a dust removing box and a heat absorbing box which are horizontally communicated, a plurality of dust removing plates are installed in the dust removing box in a staggered manner along the air flow direction, dust scraping mechanisms are arranged on each dust removing plate, dust discharging holes are formed in the bottom of the dust removing box between two adjacent dust removing plates, an exhaust pipe is installed at the end part of the dust removing box, a steam heater is installed at the top of the dust removing box, a water tank is arranged below the dust removing box, a liquid inlet pipe communicated with the steam heater is installed on the water tank, a plurality of heat absorbing pipes are installed at equal intervals between the steam heater and the dust removing box in a penetrating manner, heat transfer fins are installed on the heat absorbing pipes located in the steam heater, a heat accumulating component is installed on the heat absorbing pipes located in the heat absorbing box, a driving mechanism for driving the heat accumulating component to synchronously rotate is installed below the heat absorbing box, an impeller is arranged at the upper part in the steam heater, a generator connected with the impeller in a transmission manner is arranged at the top of the steam heater.

Compared with the prior art, the device has the advantages that: firstly, dust removal and oil removal treatment are carried out on raw gas by utilizing a dust removal box, a plurality of dust removal plates are arranged up and down in a staggered manner to form a circulation channel for the raw gas to pass through, the raw gas is guided to change the flow direction, the dust removal and oil removal treatment of the raw gas is realized, the subsequent continuous operation of heat energy recovery is improved, and meanwhile, the dust removal mechanism can timely clean dust and tar on the dust removal plates, so that the coking and oil hanging phenomena of the dust removal plates are solved; secondly, set up the heat absorption pipe on heating cabinet and steam heater, the heat accumulation subassembly is in pivoted in-process can be abundant absorb the heat in the raw coke oven gas to in transferring steam heater through the heat absorption pipe, generating electricity through the steam that produces in the heating steam, thereby realized the recycle of heat energy, the ability of heat exchange can be showing in the setting of heat accumulation subassembly and heat absorption pipe, not only can produce stable, abundant steam, and thermal rate is higher moreover, can retrieve the heat energy more than 90% in the raw coke oven gas, can produce better energy-concerving and environment-protective effect, easily uses widely.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the present utility model;

FIG. 2 is a schematic view of the ash scraping mechanism in the present utility model;

fig. 3 is a schematic view of the connection structure between the heat absorbing pipe 10 and the heat storage assembly;

in the figure: 1-riser, 2-dust removal box, 3-heat absorption box, 4-dust removal plate, 5-ash discharge port, 6-exhaust pipe, 7-steam heater, 8-water tank, 9-feed pipe, 10-heat absorption conduit, 11-heat transfer fin, 12-impeller, 13-generator, 14-steam discharge pipe, 15-driving sprocket, 16-driven sprocket, 17-scraper, 18-driving chain, 19-working box, 20-cooling branch pipe, 21-cooling main pipe, 22-steam branch pipe, 23-steam main pipe, 24-heat storage shell, 25-heat storage fin, 26-heat transfer carrier, 27-transmission motor, 28-transmission gear, 29-transmission rack, 30-transmission shaft, 31-flow blocking plate.

Description of the embodiments

The utility model is further described below with reference to the accompanying drawings, without limiting the utility model in any way, and any alterations or modifications based on the teachings of the utility model are within the scope of the utility model.

As shown in fig. 1 to 3, the utility model comprises a rising pipe 1 and a waste heat recoverer connected with the top of the rising pipe 1, the waste heat recoverer comprises a dust removing box 2 and a heat absorbing box 3 which are horizontally communicated, a plurality of dust removing plates 4 are alternately arranged in the dust removing box 2 along the air flow direction, each dust removing plate 4 is provided with a dust scraping mechanism, the dust scraping mechanism can clean dust or tar on the dust removing plates 4, the bottom of the dust removing box 2 between two adjacent dust removing plates 4 is provided with a dust discharging opening 5, after a section of use, the dust discharging opening is opened to discharge dust in the dust removing box 2, the end part of the dust removing box 2 is provided with an exhaust pipe 6, the exhaust pipe 6 is used for discharging cooled raw gas to a gas purifying system, the top of the dust removing box 2 is provided with a steam heater 7, the lower part of the dust removing box 2 is provided with a water tank 8, the water tank 8 is provided with a liquid inlet pipe 9 communicated with the steam heater 7, a plurality of heat absorption pipes 10 are arranged between the steam heater 7 and the dust removal box 2 at equal intervals in a penetrating way, the heat absorption pipes 10 adopt a heat pipe structure in the prior art, the heat pipe is used as a heat transfer component, heat of a heating object is quickly transferred to the outside of a heat source through the heat pipe, preferably, two ends of the heat absorption pipes 10 are closed, a liquid absorption core is arranged in the heat absorption pipes 10 and is mainly formed by weaving metal fibers, the porosity of a net structure formed by weaving the metal fibers of the liquid absorption core is 25-90%, so that the capillary tissue has good capillary force and higher adhesion, when the heat absorption pipe is used, a proper amount of working liquid is filled in the heat absorption pipe 10, one end of the heat absorption pipe 10 is a heat absorption section, the other end of the heat absorption pipe 10 is a heat release section, the working liquid in the liquid absorption core evaporates when one end of the heat absorption pipe 10 is heated, and the steam flows to the other end to condense the heat into liquid, the liquid flows back to the heat absorption section by the action of capillary force or gravity, so that the circulation is not repeated, and the heat is transferred from one end to the other end of the heat absorption conduit 10; heat transfer fins 11 are installed on a heat absorption conduit 10 positioned in the steam heater 7, a heat storage component is installed on the heat absorption conduit 10 positioned in the heat absorption box 3, a driving mechanism for driving the heat storage component to synchronously rotate is installed below the heat absorption box 3, an impeller 12 is arranged at the upper part in the steam heater 7, a generator 13 in transmission connection with the impeller 12 is arranged outside the steam heater 7, and a steam discharge pipe 14 is arranged at the top of the steam heater 7.

The working process of the device is as follows: firstly, cold water in a water tank 8 is added into a steam heater 7 through a liquid inlet pipe 9, the water level in the steam heater 7 and a submerged heat absorption conduit 10 are suitable, then raw gas discharged from a rising pipe 1 is introduced into a dust collection box 2, a plurality of dust collection plates 4 arranged in the dust collection box 2 are arranged up and down in a staggered way to form a circulation channel for the raw gas to change direction, the raw gas is guided to change flow direction, dust collection and oil removal treatment of the raw gas is realized, the subsequent continuous operation of heat energy recovery is improved, meanwhile, a dust collection mechanism is arranged to timely clean dust and tar on the dust collection plates 4, the phenomenon of coking and oil hanging of the dust collection plates 4 is solved, after the dust collection plates 4 are used for a period of time, dust collection at the bottom of the dust collection box 2 can be timely opened to discharge dust 5 through the dust collection mechanism, the raw gas is discharged, the dust-removed and oil-removed raw gas through the dust removal plate 4 enters the heating box 3, at the moment, the driving mechanism drives the heat storage components to synchronously rotate, the heat storage components can fully absorb heat in the raw gas in the rotating process and transfer the heat to the steam heater 4 through the heat absorption conduit 10, then the cold water in the steam heater 7 is heated through the heat absorption conduit 10 and the heat transfer fins 11, the cold water in the steam heater 7 is continuously evaporated, high-temperature steam generated by evaporation rapidly rises to the top of the steam heater 7 and then drives the impeller 12 to rotate, the generator 13 generates electricity, the steam discharged from the steam discharge pipe 14 enters the steam pipe network, the temperature of the raw gas after heat absorption of the heat storage components is reduced to below 100 ℃, and then the steam is discharged through the exhaust pipe 6, the heat can be used for drying coking coal and preheating the rest coking raw materials. The device not only can realize dust removal and oil removal treatment on raw gas and improve continuous operation of subsequent heat recovery, and solves the problems of coking and oil hanging of a dust removal plate, but also has higher heat recovery rate and can recover more than 90% of heat energy in the raw gas.

Further, the ash scraping mechanism comprises a driving sprocket 15, a driven sprocket 16, scrapers 17 and a driving chain 18, wherein the driving sprocket 15 and the driven sprocket 16 are arranged at the upper end and the lower end of the dust removal plate 4 at intervals, the driving chain 18 is sleeved between the driving sprocket 15 and the driven sprocket 16, a driving motor in transmission connection with the driving sprocket 15 is arranged on the driving sprocket 15, the driving motor is not shown in the device, the driving motor is in the prior art, the number of the scrapers 17 is two, the two scrapers 17 are positioned at the upper side and the lower side of the dust removal plate 4, the cutter faces of the two scrapers 17 are in contact with the dust removal plate 4, cutter handles of the two scrapers 17 are fixedly connected with the corresponding driving chain 18, working boxes 19 are arranged at the top and the bottom of the dust removal box 2, the arranged working boxes 19 can prevent raw gas from leaking in the working process of the ash scraping mechanism, and when the dust removal plate 4 is arranged at the top of the dust removal box 2, the driving sprocket 15 and the driving motor are arranged in the working boxes 19 above the dust removal box 2, and the driven sprocket 16 is arranged in the dust removal box 2; when the dust removing plate 4 is arranged at the bottom of the dust removing box 2, the driving sprocket 15 and the driving motor are arranged in the working box 19 below the dust removing box 2, and the driven sprocket 16 is arranged in the dust removing box 2; when the dust collecting plate 4 needs to be cleaned, the driving motor drives the driving sprocket 15 to rotate, the driving chain 18 can be driven to reciprocate up and down under the driving action of the driven sprocket 16, and the scraper 17 can be driven to clean two sides of the dust collecting plate 4 in time in the process of reciprocating up and down of the driving chain 18. In order to ensure high efficiency and stability of the scraper 17 during use, the cross-sectional shape of the scraper 17 is preferably isosceles triangle.

Further, in order to further improve the utilization ratio of heat energy, the dust collecting plates 4 are hollow structures in the interior, the lower part of each dust collecting plate 4 is provided with a cooling branch pipe 20, a plurality of cooling branch pipes 20 are connected with a cooling main pipe 21, the cooling main pipe 21 is communicated with the water tank 8, the upper part of each dust collecting plate 4 is provided with a steam branch pipe 22, the plurality of steam branch pipes 22 are connected with a steam main pipe 23, the steam main pipe 23 is communicated with the steam heater 7, cold water in the water tank 8 enters the cooling branch pipes 20 through the cooling main pipes 21, then enters each dust collecting plate 4 through the cooling branch pipes 20, dust and tar are intercepted by the dust collecting plates 4, heat in raw gas can be absorbed by the cold water, steam is continuously generated after the cold water absorbs the heat, the generated steam is discharged through the steam branch pipes 22, and after the steam discharged through the steam branch pipes 22 enters the steam main pipe 23 into the steam heater 7, the generated heat collecting plates can be directly used for generating electricity.

Further, the heat storage assembly includes a heat storage shell 24 and a heat storage fin 25, the heat storage shell 24 is coaxially rotatably mounted on the outer side of the heat absorption conduit 10, the heat storage fin 25 is mounted on the outer wall of the heat storage shell 24, the heat storage shell 24 and the heat storage fin 25 function to increase the heat exchange area with raw gas, the heat storage capacity of the heat storage assembly is improved to the greatest extent, so that the high heat recovery effect of the heat storage assembly is achieved, and in order to enhance the heat transfer effect between the heat storage assembly and the heat absorption conduit 10, a heat transfer carrier 26 is arranged between the heat storage shell 24 and the heat absorption conduit 10, and the heat transfer carrier 26 preferably uses alkali metal sodium or potassium or an alloy of the two metals as a heat carrier. The driving mechanism comprises a driving motor 27, a driving gear 28 and a driving rack 29, wherein the driving motor 27 is in the prior art, a finished product can be directly purchased according to the power used, a driving shaft 30 extending to the lower part of the heat absorption box 3 is installed at the bottom of the heat storage shell 24, the driving gear 28 is installed at the lower end of the driving shaft 30, the driving rack is meshed and sleeved on the driving gear 28, an output shaft of the driving motor 27 is in driving connection with one of the driving gears 28, and when the driving mechanism is used, the driving motor 27 drives the driving gear 28 connected with the driving motor to rotate, under the action of the driving rack 29, the driving gear 28 can be driven to synchronously rotate, the driving shaft 30 is driven to rotate, and the heat storage shell 24 and the heat transfer fins 25 can be driven to rotate in the rotating process of the driving shaft 30.

In order to make the impeller 12 fully utilize steam to generate electricity, a spoiler 31 is arranged in the steam heater 7 between the impeller 12 and the steam discharge pipe 14, ventilation holes are uniformly formed in the spoiler 31, the spoiler 31 can slow down the rising speed of steam, the working efficiency of the impeller 12 is improved, and the generating capacity of the generator 13 is improved.

Claims (9)

1. The utility model provides a coke oven raw gas waste heat recycling device, including tedge (1) and with the waste heat recoverer that tedge (1) top is connected, wherein waste heat recoverer includes dust removal case (2) and heat absorption case (3) of horizontal intercommunication, install polylith dust removal board (4) along the air current direction is crisscross in dust removal case (2), all be provided with on every dust removal board (4) and scrape grey mechanism, dust removal case (2) bottom between two adjacent dust removal boards (4) is provided with ash discharge mouth (5), blast pipe (6) are installed to the tip of dust removal case (2), steam heater (7) are installed at the top of dust removal case (2), below of dust removal case (2) is provided with water tank (8), install inlet tube (9) with steam heater (7) intercommunication on water tank (8), install many heat absorption pipes (10) between steam heater (7) and dust removal case (2) equidistant running through, install on heat absorption pipe (10) that are located in steam heater (7) heat transfer fin (11), install on heat absorption pipe (3) and drive heat absorption mechanism (12) in heat storage unit (3), the outside of the steam heater (7) is provided with a generator (13) which is connected with the impeller (12) in a transmission way, and the top of the steam heater (7) is provided with a steam discharge pipe (14).

2. The raw coke oven gas waste heat recycling device according to claim 1, wherein: the dust scraping mechanism comprises a driving sprocket (15), a driven sprocket (16), scrapers (17) and a driving chain (18), wherein the driving sprocket (15) and the driven sprocket (16) are installed at the upper end and the lower end of the dust removing plate (4) at intervals, the driving chain (18) is sleeved between the driving sprocket (15) and the driven sprocket (16), a driving motor connected with the driving sprocket (15) is installed on the driving sprocket (15), the number of the scrapers (17) is two, the two scrapers (17) are located on the upper side and the lower side of the dust removing plate (4), the cutter faces of the two scrapers (17) are in contact with the dust removing plate (4), cutter handles of the two scrapers (17) are fixedly connected with the corresponding driving chain (18), and the top and the bottom of the dust removing box (2) are provided with a working box (19).

3. The raw coke oven gas waste heat recycling device according to claim 2, wherein: the cross section of the scraper (17) is isosceles triangle.

4. The raw coke oven gas waste heat recycling device according to claim 1, wherein: the dust removal board (4) is inside hollow structure, and the lower part of every dust removal board (4) all is provided with cooling branch pipe (20), and many cooling branch pipes (20) are connected with cooling and are responsible for (21), and cooling is responsible for (21) and water tank (8) intercommunication, and the upper portion of every dust removal board (4) all is provided with steam branch pipe (22), and many steam branch pipes (22) are connected with steam and are responsible for (23), and steam is responsible for (23) and steam heater (7) intercommunication.

5. The raw coke oven gas waste heat recycling device according to claim 1, wherein: the heat storage assembly comprises a heat storage shell (24) and heat storage fins (25), wherein the heat storage shell (24) is coaxially and rotatably arranged on the outer side of the heat absorption pipe (10), and the heat storage fins (25) are arranged on the outer wall of the heat storage shell (24).

6. The raw coke oven gas waste heat recycling device according to claim 5, wherein: a heat transfer carrier (26) is arranged between the heat storage shell (24) and the heat absorption conduit (10).

7. The raw coke oven gas waste heat recycling device according to claim 5, wherein: the driving mechanism comprises a transmission motor (27), a transmission gear (28) and a transmission rack (29), a transmission shaft (30) extending to the lower part of the heat absorption box (3) is arranged at the bottom of the heat storage shell (24), the transmission gear (28) is arranged at the lower end of the transmission shaft (30), the transmission rack is meshed and sleeved on the transmission gear (28), and an output shaft of the transmission motor (27) is in transmission connection with one of the transmission gears (28).

8. The raw coke oven gas waste heat recycling device according to claim 1, wherein: both ends of the heat absorption conduit (10) are closed, and a liquid absorption core is arranged in the heat absorption conduit (10).

9. The raw coke oven gas waste heat recycling device according to claim 1, wherein: a flow blocking plate (31) is arranged in the steam heater (7) between the impeller (12) and the steam discharge pipe (14), and ventilation holes are uniformly distributed on the flow blocking plate (31).