CN213237464U

CN213237464U - Shell and tube heat exchanger with sleeve for recovering waste heat of ascending tube of coke oven

Info

Publication number: CN213237464U
Application number: CN202022109715.4U
Authority: CN
Inventors: 陈佳睿; 陈宗凯; 蒲龙; 孙海君
Original assignee: Tangshan Baokai Technology Co ltd
Current assignee: Tangshan Baokai Technology Co ltd
Priority date: 2020-09-24
Filing date: 2020-09-24
Publication date: 2021-05-18
Anticipated expiration: 2030-09-24

Abstract

The utility model relates to a tubular heat exchanger with a sleeve for recovering waste heat of a coke oven ascending tube, belonging to the technical field of recovering and utilizing the waste heat of crude gas in the ascending tube. The technical scheme is as follows: the inner-layer heat exchange tube comprises four U-shaped tubes, eight connecting bent tubes and three outer U-shaped connecting bent tubes, the four U-shaped tubes are arranged in parallel, the upper ends of the eight straight tubes of the four U-shaped tubes are respectively connected with one ends of the eight connecting bent tubes, the other ends of the eight connecting bent tubes are respectively arranged on a circular ring of the supporting seat (1) after being bent for 90 degrees, and the other ends of the six connecting bent tubes are connected in pairs through the three outer U-shaped connecting bent tubes (53); the outer sheath pipe (4) is sleeved outside the inner heat exchange pipe (5), and a gap is arranged between the inner heat exchange pipe and the outer sheath pipe. The utility model can reduce coking to the maximum extent while ensuring normal waste heat recovery to produce steam; when the heat exchanger has a leakage point, the leakage point can be found in time and water cut-off measures can be taken to prevent the coke oven from being damaged.

Description

Shell and tube heat exchanger with sleeve for recovering waste heat of ascending tube of coke oven

Technical Field

The utility model relates to a tubular heat exchanger with a sleeve for recovering waste heat of a coke oven ascending tube, belonging to the technical field of recovering and utilizing the waste heat of crude gas in the ascending tube.

Background

In the coking process of the coke oven, the temperature of the crude gas at the outlet of the coking chamber is about 650 plus 750 ℃, the crude gas enters the bridge pipe after passing through the ascending pipe, and enters the gas collecting pipe after being cooled by the sprayed ammonia water at the bridge pipe section, and the temperature of the crude gas is reduced to 82 ℃. The heat taken away by the raw gas accounts for 36 percent of the total heat of coking, and the temperature reduction by the circulating ammonia water greatly wastes a high-temperature heat source and brings a large amount of cooling water consumption to the next working procedure. The part of heat is used for waste heat recovery, so that not only can waste heat resources of raw gas of the coke oven be reasonably and effectively developed and utilized, but also steam required by coking production can be solved, energy conservation and consumption reduction of enterprises are realized, and economic benefits are improved. However, the existing heat exchanger is easy to cause the temperature of the raw gas to be too low after heat is taken, tar is separated out, chemical substances generated by tar combustion pollute air, and increasingly strict environmental protection requirements are violated. In addition, the heat exchanger may damage the coke oven once leaking.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a shell and tube heat exchanger with a sleeve for recovering waste heat of a coke oven riser, wherein an outer sheath tube is sleeved outside an inner layer heat exchange tube, and the heat taking quantity is properly reduced by indirectly taking heat, so that tar is prevented from being separated out due to too low temperature; if leakage points appear, steam can be found to emerge from the opening in time, and water cut-off measures are taken to prevent the coke oven from being damaged, so that the problems in the background technology are solved.

The technical scheme of the utility model is that:

a tube type heat exchanger with a sleeve for recovering waste heat of a coke oven riser comprises a supporting seat, a water inlet flange, a steam outlet flange, an outer sheath tube, an inner heat exchange tube and a fixed support, wherein the supporting seat consists of annular discs arranged up and down and a circular ring connected between the annular discs; the inner-layer heat exchange tube comprises four U-shaped tubes, eight connecting bent tubes and three outer U-shaped connecting bent tubes, the eight straight tube sections of the four U-shaped tubes are arranged in parallel, the arc tube sections of the two U-shaped tubes are positioned below the arc tube sections of the other two U-shaped tubes, the upper ends of the eight straight tube sections of the four U-shaped tubes are respectively connected with one ends of the eight connecting bent tubes, the other ends of the eight connecting bent tubes are bent for 90 degrees and then are respectively arranged on a circular ring of a supporting seat, the other ends of the six connecting bent tubes are connected in pairs through the three outer U-shaped connecting bent tubes, the other ends of the other two connecting bent tubes are respectively connected with a steam outlet flange and a water inlet flange which are arranged outside the circular ring of the supporting seat, and the water inlet flange, the steam outlet flange, the eight connecting bent tubes, the four U; the outer sheath pipe is all established to inlayer heat exchange tube outside cover, is equipped with the clearance between the two.

The water inlet flange and the steam outlet flange are respectively welded with the corresponding outer sheath pipes, the welding seams do not form closed loops and are provided with openings, when the inner heat exchange pipe has leakage points, steam can be sprayed out from the openings, the leakage points can be found in time, and meanwhile, leaked steam and water can be prevented from entering the carbonization chamber.

The inner diameter of the circular ring is the same as that of the upper annular disc and the lower annular disc, and the inner diameter of the circular ring is larger than or equal to that of the bridge pipe.

Asbestos ropes are coiled between the upper annular disc and the lower annular disc and between the water seal cover and the bridge pipe, and are soaked in industrial glass water and used for sealing.

Eight straight tube sections of four U type pipes are retrained fixedly through the fixed bolster between, and the fixed bolster contains eight nozzle stub and eight swing joint board, and eight nozzle stub set up respectively in the middle part of eight straight tube sections, connect through swing joint board between the eight nozzle stub.

The shape of the outer layer protecting sleeve pipe is the same as that of the inner layer heat exchange pipe, and the gap between the outer layer protecting sleeve pipe and the inner layer heat exchange pipe is 2 mm.

The utility model has the advantages that: the outer sheath pipe is sleeved outside the inner heat exchange pipe, so that the normal waste heat recovery for steam production is ensured, and meanwhile, the coking is reduced to the maximum extent; when the heat exchanger has a leakage point, the leakage point can be found in time and water cut-off measures can be taken to prevent the coke oven from being damaged.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a schematic view of the orientation of FIG. 1A-A;

FIG. 3 is a schematic cross-sectional view of the structure of FIG. 2B-B;

in the figure: the device comprises a supporting seat 1, a water inlet flange 2, a steam outlet flange 3, an outer sheath pipe 4, an inner heat exchange pipe 5, a U-shaped pipe 51, a connecting bent pipe 52, an outer U-shaped connecting bent pipe 53, a fixed support 6, a short pipe 61, a movable connecting plate 62, a welding line 7 and an opening 8.

Detailed Description

The present invention will be further explained by way of examples with reference to the accompanying drawings.

A tube type heat exchanger with a sleeve for recovering waste heat of a coke oven riser comprises a supporting seat 1, a water inlet flange 2, a steam outlet flange 3, an outer layer protecting sleeve 4, an inner layer heat exchange tube 5 and a fixed support 6, wherein the supporting seat 1 consists of annular discs arranged up and down and a circular ring connected between the annular discs; the inner layer heat exchange tube 5 comprises four U-shaped tubes 51 arranged in the ascending tube, eight connecting bent tubes and three outer U-shaped connecting bent tubes, eight straight tube sections of the four U-shaped tubes are arranged in parallel, arc tube sections of the two U-shaped tubes are positioned below arc tube sections of the other two U-shaped tubes, the upper ends of the eight straight tube sections of the four U-shaped tubes are respectively connected with one ends of the eight connecting bent tubes 52, the other ends of the eight connecting bent tubes are respectively arranged on a circular ring of the supporting seat 1 after being bent for 90 degrees, wherein the other ends of the six connecting bent pipes are connected two by three external U-shaped connecting bent pipes 53, the other ends of the other two connecting bent pipes are respectively connected with a steam outlet flange 3 and a water inlet flange 2 which are arranged outside the circular ring of the supporting seat 1, and the water inlet flange, the steam outlet flange, the eight connecting bent pipes, the four U-shaped pipes and the three external U-shaped connecting bent pipes are connected into a through pipeline; the outer sheath pipe 4 is all established to the outside cover of inlayer heat exchange tube 5, is equipped with the clearance between the two.

The water inlet flange 2 and the steam outlet flange 3 are respectively welded with the corresponding outer sheath pipes 4, the welding seams 7 do not form a closed loop and are provided with openings 8, when leakage points appear on the inner heat exchange pipe 5, steam can be sprayed out from the openings, so that the leakage points can be found in time, and meanwhile, leaked steam and water can be prevented from entering the carbonization chamber.

Eight straight tube sections of the four U-shaped tubes are restrained and fixed through the fixing support 6, the fixing support comprises eight short tubes 61 and eight movable connecting plates 62, the eight short tubes 61 are respectively arranged in the middle of the eight straight tube sections, and the eight short tubes 61 are connected through the movable connecting plates 62.

The outer layer protecting sleeve 4 covers the four U-shaped pipes, the eight connecting bent pipes and the three outer U-shaped connecting bent pipes, can be of an integral structure, and can also be formed by welding a plurality of pipe sections.

The outer sheath pipe 4 and the inner heat exchange pipe 5 are both made of 310S stainless steel and have excellent physical and chemical properties.

In fig. 1, the inner heat exchange tube 5 is inserted into the outer sheath tube 4, bent as a whole, and then the respective parts are welded and assembled. As shown in figure 2, the outer diameter of the inner layer heat exchange tube 5 and the inner diameter of the outer layer protecting sleeve 4 have a clearance, and the theoretical clearance is 2 mm. As shown in fig. 3, the upper ends of the two connecting bent pipes are respectively welded with the water inlet flange 2 and the steam outlet flange 3, and the outer sheath pipes outside the two connecting bent pipes are not welded with the water inlet flange 2 and the steam outlet flange 3 to form a closed loop, and an opening 8 is reserved for the leakage steam to be sprayed out. The supporting seat 1 is installed between the water seal cover and the bridge pipe through bolts, the upper annular disc, the lower annular disc, the water seal cover and the bridge pipe are arranged between the two connecting bent pipes and the water inlet flange and the steam outlet flange, the two connecting bent pipes are all wound by asbestos ropes soaked by industrial glass water to serve as seals, the water inlet flange 2 is connected with the water inlet branch pipe, and the steam outlet flange 3 is connected with the steam-water mixture main pipe. Sensible heat of raw coke oven gas is absorbed through the outer sheath pipe, heat is radiated to the inner heat exchange pipe 5, and deaerated water entering the heat exchanger is heated into a steam-water mixture and enters the steam pocket for steam-water separation.

Claims

1. A shell and tube heat exchanger with a sleeve for recovering waste heat of a coke oven ascending tube is characterized in that: the steam-water-supply heat exchanger comprises a supporting seat (1), a water inlet flange (2), a steam outlet flange (3), an outer layer protecting sleeve (4), an inner layer heat exchange pipe (5) and a fixing support (6), wherein the supporting seat (1) consists of an upper annular disc and a lower annular disc which are arranged up and down and a circular ring connected between the upper annular disc and the lower annular disc, positioning holes are formed in the two ends of the upper annular disc and the lower annular disc, matched bolts are arranged in the positioning holes, and the supporting seat (1) is arranged between a water sealing cover of an ascending pipe and a; the inner-layer heat exchange tube (5) comprises four U-shaped tubes (51), eight connecting bent tubes and three outer U-shaped connecting bent tubes which are arranged in the ascending tube, eight straight tube sections of the four U-shaped tubes are arranged in parallel, arc tube sections of two U-shaped tubes are positioned below arc tube sections of the other two U-shaped tubes, the upper ends of the eight straight tube sections of the four U-shaped tubes are respectively connected with one ends of the eight connecting bent tubes (52), the other ends of the eight connecting bent tubes are respectively arranged on a circular ring of the supporting seat (1) after being bent for 90 degrees, wherein the other ends of the six connecting bent pipes are connected in pairs through three external U-shaped connecting bent pipes (53), the other ends of the other two connecting bent pipes are respectively connected with a steam outlet flange (3) and a water inlet flange (2) which are arranged outside the circular ring of the supporting seat (1), and the water inlet flange, the steam outlet flange, the eight connecting bent pipes, the four U-shaped pipes and the three external U-shaped connecting bent pipes are connected into a through pipeline; the outer sheath pipe (4) is sleeved outside the inner heat exchange pipe (5), and a gap is arranged between the inner heat exchange pipe and the outer sheath pipe.

2. The tube type heat exchanger with the sleeve for recovering the waste heat of the ascending tube of the coke oven as recited in claim 1, wherein: the water inlet flange (2) and the steam outlet flange (3) are respectively welded with the corresponding outer sheath pipes (4), and the welding seams (7) do not form a closed loop and are provided with openings (8).

3. The tube type heat exchanger with the sleeve for recovering the waste heat of the ascending tube of the coke oven according to claim 1 or 2, which is characterized in that: the inner diameter of the circular ring is the same as that of the upper annular disc and the lower annular disc, and the inner diameter of the circular ring is larger than or equal to that of the bridge pipe.

4. The tube type heat exchanger with the sleeve for recovering the waste heat of the ascending tube of the coke oven according to claim 1 or 2, which is characterized in that: asbestos ropes are respectively coiled between the upper annular disc and the lower annular disc, the water seal cover and the bridge pipe.

5. The tube type heat exchanger with the sleeve for recovering the waste heat of the ascending tube of the coke oven according to claim 1 or 2, which is characterized in that: eight straight tube sections of four U type pipes are retrained fixedly through fixed bolster (6) between, and the fixed bolster contains eight nozzle stub (61) and eight swing joint board (62), and eight nozzle stub (61) set up respectively in the middle part of eight straight tube sections, connect through swing joint board (62) between eight nozzle stub (61).