CN211546409U

CN211546409U - Coke oven ascending pipe special-shaped section coil heat exchanger

Info

Publication number: CN211546409U
Application number: CN202020081555.4U
Authority: CN
Inventors: 宋旭勇; 刘文焱; 潘聪
Original assignee: Wuhan Front Industrial Equipment Technology Co ltd
Current assignee: Wuhan Front Industrial Equipment Technology Co ltd
Priority date: 2020-01-15
Filing date: 2020-01-15
Publication date: 2020-09-22
Anticipated expiration: 2030-01-15

Abstract

The utility model discloses a coil heat exchanger with a special-shaped section for a coke oven ascending pipe, relating to the technical field of coke oven heat exchange; the outer side wall of the sleeve is provided with special-shaped cross-section coil pipes, the heat conducting layer is arranged between the special-shaped cross-section coil pipes and the sleeve, the cross sections of the special-shaped cross-section coil pipes are crescent, one side of each special-shaped cross-section coil pipe is an arc with a radian of pi, the other side of each special-shaped cross-section coil pipe is a half arc line of an ellipse with an eccentricity of 0.968, the corresponding diameter of the arc with the radian of pi is 60mm, the corresponding ellipse major axis of the half arc line of the ellipse with the eccentricity of; the utility model makes the steam-water mixture distributed more evenly on the section of the coil pipe, thereby increasing the effective heat exchange area, reducing the heat transfer resistance, strengthening the heat transfer, simultaneously ensuring the wall temperature of the coil pipe to be even and ensuring the safety; the temperature stability of the inner wall of the ascending pipe can be ensured in the production period of the coke oven, and the sleeve is prevented from overheating and the inner wall of the ascending pipe is prevented from coking.

Description

Coke oven ascending pipe special-shaped section coil heat exchanger

Technical Field

The utility model belongs to the technical field of the coke oven heat transfer, concretely relates to coke oven tedge dysmorphism cross-section coil pipe heat exchanger.

Background

At present, with the high importance of a coking plant on resource recycling, the waste heat recovery of the raw gas is one of the main ways for reducing the energy consumption of the coke oven, and the existing process is to make the raw gas with high temperature of 650-850 ℃ escaping from a coking chamber enter a gas collecting pipe through an ascending pipe heat exchanger to recover the waste heat. The coke oven crude gas contains various tar components, the dew point of the coke oven crude gas is mainly distributed at 200-350 ℃, liquid with higher viscosity is easily generated to be tightly adhered to the surface of a tube wall, so that the problems of adhesion and coking are caused, the production working condition is unstable, and the heat transfer problem is further worsened. When the riser pipe is subjected to alternate changes of dry burning and water supply, the metal material of the pipe body is easy to generate high-temperature oxidation and high-temperature creep deformation, so that the deformation and water leakage of the cylinder body are caused, and the normal production of the coke oven is influenced. At present, the coil pipe heat exchanger of the ascending pipe has the common problems of low heat exchange efficiency and large flow resistance, and meanwhile, steam and water in the coil pipe are not uniformly distributed, and the local overheating and high temperature of the coil pipe easily cause the occurrence of pipe explosion safety accidents.

The traditional coke oven ascending pipe is an adiabatic gas channel, the temperature of the crude gas is between 650 ℃ and 850 ℃, the crude gas is generally cooled by spraying ammonia water, the temperature of the crude gas is reduced from 650 ℃ to 850 ℃ to about 80 ℃, and then the crude gas enters the next process flow for treatment, a large amount of ammonia water is required to be sprayed in the process, the cost is high, the environment is polluted, and more importantly, the heat of the crude gas is wasted, and the energy is not fully utilized, so that the energy waste is caused.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems that the existing coke oven ascending pipe needs a large amount of sprayed ammonia water, has higher cost and can pollute the environment, more importantly, the heat of the raw coke oven gas is wasted, is not fully utilized and causes energy waste, and when the ascending pipe is subjected to dry burning and water supply alternate change, the metal material of the pipe body is easy to generate high-temperature oxidation and high-temperature creep deformation, so that the deformation and water leakage of the cylinder body are caused, and the normal production of the coke oven is influenced; the existing coil pipe heat exchanger of the ascending pipe has the common problems of low heat exchange efficiency and large flow resistance, and simultaneously, the steam-water distribution in the coil pipe is not uniform, and the local overheating and high temperature of the coil pipe easily cause the occurrence of pipe explosion safety accidents; an object of the utility model is to provide a coke oven tedge dysmorphism cross-section coil pipe heat exchanger.

The utility model relates to a coil heat exchanger with a special-shaped cross section for a coke oven ascending pipe, which comprises a coil with a special-shaped cross section, a heat conducting layer, a sleeve, a heat accumulating layer and a heat insulating layer; the heat-insulating sleeve is characterized in that special-shaped cross-section coil pipes are arranged on the outer side wall of the sleeve, the heat conducting layer is arranged between the special-shaped cross-section coil pipes and the sleeve, a heat storage layer is arranged on the inner side wall of the sleeve, a heat insulating layer is arranged on the outer side of the heat conducting layer, the cross section of each special-shaped cross-section coil pipe is crescent, one side of each special-shaped cross-section coil pipe is an arc with a radian of pi, the other side of each special-shaped cross-section coil pipe is a half arc of an ellipse with an eccentricity of 0.968, the corresponding diameter of the arc with.

Preferably, the wall thickness of the heat conducting layer is 8 mm.

Preferably, the wall thickness of the heat storage layer is 20 mm.

Preferably, the thickness of the heat-insulating layer is 80 mm.

Compared with the prior art, the beneficial effects of the utility model are that:

firstly, the steam-water mixture is more uniformly distributed on the section of the coil pipe, so that the effective heat exchange area is increased, the heat transfer resistance is reduced, the heat transfer is enhanced, the wall temperature of the coil pipe is ensured to be uniform, and the safety is ensured; high-heat-conduction materials are filled between the coil pipes and the sleeves and between the coil pipes, so that the heat conduction capability between the sleeves and the coil pipes can be enhanced;

and secondly, a heat storage layer is attached to the inner wall of the ascending pipe sleeve, and the heat storage layer has strong heat storage capacity, can ensure the temperature stability of the inner wall of the ascending pipe in the production period of the coke oven, prevents the sleeve from being overheated, and simultaneously prevents the inner wall of the ascending pipe from coking.

Drawings

For ease of illustration, the invention is described in detail by the following detailed description and accompanying drawings.

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a radial distribution diagram of steam-water flow velocity along a coil of a conventional coil heat exchanger;

fig. 3 is the radial distribution diagram of the steam-water flow rate along the coil pipe of the present invention.

In the figure: 1-special section coil pipe; 2-heat conducting layer; 3-a sleeve; 4-heat storage layer; 5-insulating layer.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described below with reference to specific embodiments shown in the accompanying drawings. It should be understood that the description is intended to be illustrative only and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.

It should also be noted that, in order to avoid obscuring the invention with unnecessary details, only the structures and/or process steps that are closely related to the solution according to the invention are shown in the drawings, while other details that are not relevant to the invention are omitted.

As shown in fig. 1, the following technical solutions are adopted in the present embodiment: the heat-conducting type heat-insulating pipe comprises a special-shaped section coil pipe 1, a heat-conducting layer 2, a sleeve 3, a heat-accumulating layer 4 and a heat-insulating layer 5; the heat-insulating sleeve is characterized in that special-shaped section coil pipes 1 are arranged on the outer side wall of the sleeve 3, the heat conducting layer 2 is arranged between the special-shaped section coil pipes 1 and the sleeve 3, a heat storage layer 4 is arranged on the inner side wall of the sleeve 3, a heat insulating layer 5 is arranged on the outer side of the heat conducting layer 2, the sections of the special-shaped section coil pipes 1 are crescent-shaped, one side of each special-shaped section coil pipe 1 is an arc with a radian of pi, the other side of each special-shaped section coil pipe 1 is a half arc of an ellipse with an eccentricity of 0.968, the corresponding diameter of the arc with the radian of pi is 60mm, the corresponding.

As shown in FIG. 2, the radial velocity distribution of the steam-water flow velocity of the conventional coil from the inner wall side to the outer wall side shows that the velocity gradient is large, and the velocity of the steam-water flow at the inner wall side is small and the flow distribution is small from 0.5m/s at the inner wall side to 1.1m/s at the outer wall side.

As shown in figure 3, the radial velocity distribution of the steam-water flow velocity of the coil pipe with the special-shaped section from the inner wall side to the outer wall side is shown in figure 2, the velocity gradient is smaller, the steam-water flow velocity is uniformly distributed along the radial direction, the integral steam-water flow velocity distribution in the pipe is more uniform from 0.6m/s of the inner wall side to 0.9m/s of the outer wall side, the flow field is uniform, and the heat exchange efficiency is improved and the safe operation is ensured.

In the specific embodiment, the cross section of the coil 1 with the special-shaped cross section is crescent, the size of the cross section of the coil is that the diameter corresponding to the arc with the radian pi is 60mm, the major axis of the ellipse corresponding to the half arc of the ellipse with the eccentricity of 0.968 is 60mm, and the minor axis of the ellipse is 15 mm. The heat conducting layer 2 is 40mm thick, is arranged between the coil pipes and the sleeve, and is made of high-heat-conductivity materials; the heat-conducting layer is provided with a heat-insulating layer on the outer side; the sleeve 3 is made of heat-resistant steel, and the wall thickness is 8 mm; the heat storage layer 4 is 20mm thick and is formed by compounding special silicon carbide, brown corundum and the like which are high temperature resistant, corrosion resistant and strong in heat storage capacity; the thickness of the heat-insulating layer 5 is 80 mm.

The embodiment provides a coil heat exchanger with a special-shaped cross section, which aims at the problems of low heat exchange efficiency, large flow resistance and uneven steam-water distribution in a coil of the existing coil heat exchanger of a coke oven ascending pipe; firstly, the section of the coil adopts a crescent-shaped special-shaped section, and compared with the conventional coil with a circular section, the steam-water mixture can be more uniformly distributed on the section of the coil, so that the effective heat exchange area is increased, the heat transfer resistance is reduced, the heat transfer is enhanced, the wall temperature of the coil is uniform, and the safety is ensured; high-heat-conduction materials are filled between the coil pipes and the sleeves and between the coil pipes, so that the heat conduction capability between the sleeves and the coil pipes can be enhanced; the inner wall of the ascending pipe sleeve is attached with a heat storage layer again, the heat storage layer has strong heat storage capacity, the temperature stability of the inner wall of the ascending pipe can be ensured in the production period of the coke oven, the sleeve is prevented from being overheated, and meanwhile, the inner wall of the ascending pipe is prevented from being coked.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A coke oven ascending pipe special-shaped section coil heat exchanger is characterized in that: comprises a coil pipe with a special-shaped section, a heat conducting layer, a sleeve, a heat storage layer and a heat insulating layer; the heat-insulating sleeve is characterized in that special-shaped cross-section coil pipes are arranged on the outer side wall of the sleeve, the heat conducting layer is arranged between the special-shaped cross-section coil pipes and the sleeve, a heat storage layer is arranged on the inner side wall of the sleeve, a heat insulating layer is arranged on the outer side of the heat conducting layer, the cross section of each special-shaped cross-section coil pipe is crescent, one side of each special-shaped cross-section coil pipe is an arc with a radian of pi, the other side of each special-shaped cross-section coil pipe is a half arc of an ellipse with an eccentricity of 0.968, the corresponding diameter of the arc with.

2. The coke oven ascension pipe odd-shaped cross-section coil heat exchanger of claim 1, wherein: the wall thickness of the heat conducting layer is 8 mm.

3. The coke oven ascension pipe odd-shaped cross-section coil heat exchanger of claim 1, wherein: the wall thickness of the heat storage layer is 20 mm.

4. The coke oven ascension pipe odd-shaped cross-section coil heat exchanger of claim 1, wherein: the thickness of the heat-insulating layer is 80 mm.