CN111238247A - Ascending pipe for recovering waste heat of coke oven crude gas and method for utilizing waste heat of ascending pipe - Google Patents

Abstract

The embodiment of the invention provides a riser for recovering waste heat of raw coke oven gas and a method for utilizing the waste heat of the riser. The ascending tube comprises a base, an ascending tube shell and an ascending tube cover which are sequentially connected from bottom to top; the ascending pipe shell is formed by sleeving an inner cylinder and an outer cylinder; a heat exchange channel is formed between the inner cylinder and the outer cylinder; a riser lining is built in the inner steel plate; the outer cylinder is provided with a heat exchange working medium inlet and a heat exchange working medium outlet which are communicated with the heat exchange channel; the heat exchange working medium inlet is positioned at the lower part of the riser shell, and the heat exchange working medium outlet is positioned at the upper part of the riser shell; introducing a heat exchange working medium into the heat exchange channel through a heat exchange working medium inlet, wherein the heat exchange working medium is coal gas or air or hydrogen; and after heat exchange is carried out on the heat exchange working medium in the heat exchange channel, the heat exchange working medium is discharged from the heat exchange working medium outlet. The problem that the existing ascending pipe adopting demineralized water as a heat exchange working medium is easy to leak and damage the furnace wall of the carbonization chamber of the coke furnace can be solved through the scheme.

Description

A riser for recovering waste heat from coke oven waste gas and a method for utilizing the waste heat of the riser

technical field

The invention relates to the technical field of coking process waste heat recovery, in particular to a riser for recovering waste heat of coke oven waste gas and a method for utilizing the waste heat of the riser.

Background technique

The coking industry is a basic industry with high pollution, high emissions and high energy consumption, and it produces important coke raw materials for the iron and steel industry. Coke oven is the core thermal equipment with high energy consumption in coking enterprises. The energy medium supplied to coke oven is mainly industrial gas such as coke oven gas, blast furnace gas and producer gas. The heat energy released by the combustion of industrial gas in the coke oven is mainly used for the dry distillation of the coal, and nearly 73% of the heat energy is converted into the chemical energy of the product coke and the heat energy of the waste gas.

During the coke oven production process, the high-temperature waste gas is led from the carbonization chamber to the gas collecting pipe through the channel of the rising pipe. The riser body includes the riser base, the cylindrical riser shell made of steel plate, the bridge tube shell, the riser lining and the riser cover and other auxiliary components. The cylindrical riser shell can be adjusted according to the overall height of the riser. The case is divided into several pipe sections and connected by flanges. The inside of the riser is lined with high temperature resistant refractory bricks or refractory castables.

At present, in the normal production of coke ovens, the high-temperature waste gas with a temperature of up to 700 ℃ ~ 900 ℃ is sucked into the gas collecting pipe after passing through the cylindrical channel in the riser, and part of the heat of the high-temperature waste gas passes through the lining of the riser and the shell of the riser. of steel plates. The surface temperature of the riser is as high as 80-300°C, and there is a large temperature difference compared with the average ambient temperature of 25°C. Part of the sensible heat carried by the raw gas passes through the outer surface of the steel plate of the riser shell and is dissipated into the surrounding environment by convection and radiation. The lost thermal energy not only results in a waste of energy, but also the thermal energy dissipated into the environment leads to a high ambient temperature on the furnace top, which affects the development of production operations and testing.

From the above analysis, it can be seen that recovering the heat dissipated on the surface of the riser has considerable economic and environmental benefits.

In the 1970s, Japanese steel companies made the riser tube into the form of a jacket, that is, the two-layer steel plate was made into a hollow structure, and the heat-conducting oil was used as the heat-exchange medium, and the heat-conducting oil flowed through the jacket space to achieve convection and heat transfer. The heat transferred from the raw gas through the lining of the riser pipe and the steel plate of the shell is recovered by means of heat conduction.

However, the furnace wall of the large-scale coke oven carbonization chamber is built with silica bricks. The silica bricks have crystal transformation points, and the silica bricks have excellent thermal vibration stability performance above 600 °C. Damage in the form of explosion, etc., will shorten the life of the coke oven. The heat-conducting oil is a liquid medium and has a large latent heat of evaporation. When the riser jacket leaks due to welding quality and durability, a large amount of heat-conducting oil will flow or splash on the furnace wall of the carbonization chamber, and a large amount of latent heat of evaporation will occur. As a result, the temperature of the furnace wall decreases sharply, which leads to the destruction of the silica brick. Therefore, this technology is not widely used in industry.

In recent years, under the pressure of energy saving and emission reduction and improving the operating environment, the recovery and utilization technology of heat loss on the surface of the riser has received more and more attention and research. Some waste heat recovery technologies using demineralized water as working fluid have been applied in industry.

Although water is one of the best heat exchange working fluids found and widely used in industry due to its large specific heat and latent heat of evaporation. However, under the constraints that the first-generation coke oven is older than 25 years and the coke oven wall is made of silica brick, no matter how the manufacturing process of the riser shell jacket structure is advanced and improved, there is a problem of durability. Leaks are bound to cause irreparable damage to the coke oven walls.

SUMMARY OF THE INVENTION

The purpose of the embodiments of the present invention is to provide a riser for recovering waste heat from coke oven waste gas and a method for utilizing the waste heat of the riser, so as to solve the problem that the existing riser using demineralized water as the heat exchange working medium is prone to leakage and damage to the coke oven carbonization chamber Furnace wall problem. The specific technical solutions are as follows:

In a first aspect, an embodiment of the present invention provides a riser pipe for recovering waste heat from coke oven waste gas, comprising a base, a riser pipe shell and a riser pipe cover that are connected in sequence from bottom to top;

The riser shell is formed by sheathing an inner cylinder and an outer cylinder; a heat exchange channel is formed between the inner cylinder and the outer cylinder; a riser lining is built in the inner layer of steel plates;

The outer cylinder is provided with a heat exchange working medium inlet and a heat exchange working medium outlet, and the heat exchange working medium inlet and the heat exchange working medium outlet are communicated with the heat exchange channel; the heat exchange working medium inlet is located in the riser pipe the lower part of the shell, the heat exchange working medium outlet is located in the upper part of the riser shell;

A heat exchange working medium is introduced into the heat exchange channel through the heat exchange working medium inlet, and the heat exchange working medium is coal gas, air or hydrogen; The heat exchange working medium is discharged from the outlet.

Optionally, a partition plate is arranged in the heat exchange channel, and the partition plate divides the heat exchange channel into multiple sections;

Each section of the heat exchange channel is provided with a heat exchange working medium inlet corresponding to the lower part of the riser shell, and a heat exchange working medium outlet at the upper part.

Optionally, the heat exchange channel is a spiral-rising heat exchange channel, and the spiral-rising heat exchange channel is a single-spiral-rising heat exchange channel or a multi-spiral-rising heat exchange channel.

Optionally, the value range of the distance d between the inner cylinder and the outer cylinder is [10mm, 150mm].

Optionally, the value range of the distance d between the inner cylinder and the outer cylinder is [20mm, 100mm].

Optionally, the riser casing includes a straight pipe casing and a bridge pipe casing, and the straight pipe casing and the bridge pipe casing are welded and connected in sections.

In a second aspect, an embodiment of the present invention further provides a method for utilizing the waste heat of a riser, including:

Through the gas introduction pipeline, the gas transported by the gas main pipeline is connected to the heat exchange channel of the riser pipe in the first aspect for heat exchange; wherein, the gas is blast furnace gas or coke oven gas;

The gas after heat exchange through the heat exchange channel is connected to the return gas pipeline system through the gas outlet pipeline; wherein, when the gas is blast furnace gas, the return gas pipeline system is used to heat the blast furnace; the gas In the case of coke oven gas, the return gas pipeline system is used for coke oven heating.

In a third aspect, the embodiment of the present invention also provides another method for utilizing the waste heat of the riser, including:

The ambient air is pressurized by a fan;

The air pressurized by the fan is connected to the heat exchange channel of the riser described in the first aspect through the air introduction pipeline for heat exchange;

The air after heat exchange through the heat exchange channel is transported to a designated air inlet through an air outlet line; wherein, the designated air inlet includes an air inlet of a coke oven gas exchange cock and/or an air inlet of a blast furnace gas exchange cock and/or the air inlet of the coke oven off-gas switch and/or the gas inlet of the coke oven off-gas switch.

The riser pipe for recovering waste heat of coke oven waste gas provided by the embodiment of the present invention adopts coal gas, air or hydrogen as the heat exchange working medium to recover the heat loss on the surface of the riser pipe of the coke oven and reduce the surface temperature of the riser pipe. Since gas, air or hydrogen will not flow or splash on the furnace wall of the carbonization chamber to damage the silica bricks, it can solve the problem of easy leakage and damage to the furnace wall of the carbonization chamber in the existing riser pipe using demineralized water as the heat exchange medium.

The embodiment of the present invention provides a riser pipe for recovering waste heat from coke oven waste gas, using coal gas, air or hydrogen as the heat exchange working medium, which will not cause the tar in the waste gas to condense and block the riser pipe; and uses gas as the heat exchange process. The quality riser tube, which is not a pressure vessel, will not affect the continuous and uninterrupted generation of the coke oven.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

Fig. 1 is the structural representation of a kind of riser pipe that recovers the waste heat of coke oven waste gas provided by the embodiment of the present invention;

FIG. 2 is a flowchart of a first method for utilizing waste heat of a riser provided by an embodiment of the present invention;

3 is a flowchart of a second method for utilizing the waste heat of a riser provided by an embodiment of the present invention;

4 is a flowchart of a third method for utilizing waste heat from a riser provided by an embodiment of the present invention;

5 is a flowchart of a fourth method for utilizing the waste heat of a riser provided by an embodiment of the present invention;

FIG. 6 is a flowchart of a fifth method for utilizing waste heat of a riser provided by an embodiment of the present invention.

The description of each label in the figure is as follows:

1—base;

2—straight pipe shell;

21—Inner cylinder, 211—Rising pipe lining;

22—heat exchange channel, 221—clapboard;

23—outer cylinder, 231—heat exchange working medium inlet, 232—heat exchange working medium outlet;

3—Bridge tube shell.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In order to solve the problem of easy leakage and damage to the furnace wall of the coke oven carbonization chamber in the existing riser pipe using demineralized water as the heat exchange working medium, the embodiment of the present invention provides a riser pipe for recovering the waste heat of coke oven waste gas and a method for utilizing the waste heat of the riser pipe .

The following first introduces a riser pipe for recovering waste heat from coke oven waste gas provided by the embodiment of the present invention.

The embodiment of the present invention provides a riser pipe for recovering waste heat of coke oven waste gas, comprising a base, a riser pipe shell and a riser pipe cover which are connected in sequence from bottom to top;

The riser shell is formed by sheathing an inner cylinder and an outer cylinder; a heat exchange channel is formed between the inner cylinder and the outer cylinder; a riser lining is built in the inner layer of steel plates;

The outer cylinder is provided with a heat exchange working medium inlet and a heat exchange working medium outlet, and the heat exchange working medium inlet and the heat exchange working medium outlet are communicated with the heat exchange channel; the heat exchange working medium inlet is located in the riser pipe the lower part of the shell, the heat exchange working medium outlet is located in the upper part of the riser shell;

A heat exchange working medium is introduced into the heat exchange channel through the heat exchange working medium inlet, and the heat exchange working medium is coal gas, air or hydrogen; The heat exchange working medium is discharged from the outlet.

It should be noted that the lining of the rising pipe in the inner cylinder may be refractory materials such as shaped refractory products or refractory castables, wherein the shaped refractory products may be clay bricks or the like. In specific applications, appropriate materials can be selected according to the amount of heat that needs to be exchanged. For example, when a large amount of heat exchange is not required, the lining of the riser is preferably clay bricks, and ceramic bricks can be laid between the clay bricks and the inner cylinder. Fiber insulation products or aerogel insulation materials; when a large amount of heat exchange is required, silicon carbide products with excellent thermal conductivity are preferred for the lining of the riser; of course, the lining of the riser is not limited to the above materials.

Alternatively, the gas may include coke oven gas, converter gas, blast furnace gas, and the like. The material of the inner cylinder and the outer cylinder can be ordinary carbon steel plate or alloy steel plate.

It can be understood that the base is used to fixedly connect the coke oven, and the riser cover is generally a steel plate welded part. By opening and closing the riser cover, the waste gas in the riser can be released. .

In addition, the number of heat exchange working medium inlets may be one or more, and the number of heat exchange working medium outlets may be one or more. The shape of the inlet and outlet is usually circular, but other shapes, such as square, are also possible. The size of the inlet and outlet should be reasonably selected according to actual needs.

The riser pipe for recovering the waste heat of the coke oven waste gas provided by the embodiment of the present invention adopts coal gas, air or hydrogen as the heat exchange working medium, recovers the heat loss on the surface of the riser pipe of the coke oven, reduces the surface temperature of the riser pipe, and can reduce the surface temperature of the riser pipe. Control between 30 ℃ ~ 80 ℃. Since gas, air or hydrogen will not flow or splash on the furnace wall of the carbonization chamber to damage the silica bricks, it can solve the problem of easy leakage and damage to the furnace wall of the carbonization chamber in the existing riser pipe using demineralized water as the heat exchange medium.

In addition, because the waste gas close to the lining wall of the riser is restricted by the frictional resistance of the wall surface, its flow speed is slow and it is in a laminar flow state, that is, the waste gas close to the lining wall has a relatively long residence time and the lining of the riser. For heat exchange, under the working condition of demineralized water as the heat exchange working medium, it is easy to cause the temperature of the waste gas near the lining wall to drop below the dew point temperature of the tar, and condensation will occur, which will block the outlet of the waste gas in the riser. aisle. As for the riser pipe with jacket structure, the process of recovering waste heat by using demineralized water as the heat exchange working medium belongs to the category of pressure vessels according to relevant laws and technical standards, that is, according to the requirements of national safety production regulations, it must be There is an irreconcilable contradiction between the annual inspection system of the riser pipe and its auxiliary pressure pipes and the requirement of continuous and uninterrupted production of coke ovens. The embodiment of the present invention provides a riser pipe for recovering waste heat from coke oven waste gas, using coal gas, air or hydrogen as the heat exchange working medium, which will not cause the tar in the waste gas to condense and block the riser pipe; and uses gas as the heat exchange process. The quality riser tube, which is not a pressure vessel, will not affect the continuous and uninterrupted generation of the coke oven.

Optionally, a partition plate is arranged in the heat exchange channel, and the partition plate divides the heat exchange channel into multiple sections;

Each section of the heat exchange channel is provided with a heat exchange working medium inlet corresponding to the lower part of the riser shell, and a heat exchange working medium outlet at the upper part.

It can be understood that the use of metal or non-metallic materials to separate the heat exchange channel between the inner cylinder and the outer cylinder can increase the residence time of the heat exchange working medium in the heat exchange channel and improve the flow state of the heat exchange working medium. The heat exchange area and heat transfer coefficient can effectively improve the heat exchange efficiency and meet the needs of fluid flow pressure loss.

In addition, according to the number and form of partitions of the cooling channels, a plurality of heat-exchange medium inlets and heat-exchange medium outlets may be provided in the circumferential direction of the outer cylinder.

Optionally, the heat exchange channel may be a spiral-rising heat exchange channel, and the spiral-rising heat exchange channel may be a single-spiral-rising heat exchange channel or a multi-spiral-rising heat exchange channel. Of course, it is not limited, and other forms of heat exchange channels can also be used.

Optionally, the value range of the distance d between the inner cylinder and the outer cylinder may be [10mm, 150mm].

Optionally, the value range of the distance d between the inner cylinder and the outer cylinder may be [20mm, 100mm].

Optionally, the riser casing includes a straight pipe casing and a bridge pipe casing, and the straight pipe casing and the bridge pipe casing are welded and connected in sections.

Based on the above-mentioned riser pipe for recovering waste heat of coke oven waste gas, the embodiment of the present invention further provides a method for utilizing the waste heat of the riser pipe. The method can include:

Through the gas introduction pipeline, the gas transported by the gas main pipeline is connected to the heat exchange channel of the above-mentioned rising pipe for heat exchange; wherein, the gas is blast furnace gas or coke oven gas;

The gas after heat exchange through the heat exchange channel is connected to the return gas pipeline system through the gas outlet pipeline; wherein, when the gas is blast furnace gas, the return gas pipeline system is used to heat the blast furnace; the gas In the case of coke oven gas, the return gas pipeline system is used for coke oven heating. The return gas pipeline system consists of a series of intricate pipelines with various valves and flow and pressure regulating devices.

In the method for utilizing the waste heat of the riser provided by the embodiment of the present invention, by passing the blast furnace gas or coke oven gas into the riser of the embodiment of the present invention, the heat loss on the surface of the riser is recovered, which can effectively prevent the moisture in the gas from condensing and causing acid corrosion. The phenomenon of pipeline; avoids the special configuration of the heating device for heating the gas, saves the purchase cost of the heating equipment, and has considerable economic benefits.

Based on the above-mentioned riser pipe for recovering the waste heat of coke oven waste gas, the embodiment of the present invention further provides another method for utilizing the waste heat of the riser pipe. The method can include:

The ambient air is pressurized by a fan;

The air pressurized by the fan is connected to the heat exchange channel of the above-mentioned riser through the air introduction pipeline for heat exchange;

The air after heat exchange through the heat exchange channel is transported to a designated air inlet through an air outlet line; wherein, the designated air inlet includes an air inlet of a coke oven gas exchange cock and/or an air inlet of a blast furnace gas exchange cock and/or the air inlet of the coke oven off-gas switch and/or the gas inlet of the coke oven off-gas switch.

It should be noted that if the pressurized and heat-exchanged air is introduced into the air inlet of the coke oven and/or the blast furnace gas exchange cock, when the gas supply to the coke oven or blast furnace is stopped, the gas exchange cock is switched to the air inlet, and the high temperature High-pressure air can remove the graphite produced by the pyrolysis of residual gas in the gas pipeline. Since water vapor condensation does not occur in high-temperature air, there is no problem of acid corrosion of gas pipelines caused by condensation of water vapor in the air.

If the pressurized and heat-exchanged air is introduced into the air inlet of the coke oven exhaust gas shutter, it can be used as the combustion-supporting air for the coke oven heating when the coke oven is heated. If the pressurized heat-exchanged air is introduced into the gas inlet of the coke oven exhaust gas switch, it can be used to replace the gas inside the regenerator after the coke oven is heated and reversed.

Since both the gas exchange cock and the exhaust gas switch can adopt the prior art, they will not be repeated here.

In the method for utilizing the waste heat of the riser provided by the embodiment of the present invention, the ambient air is pressurized by a fan, and the pressurized air is exchanged for heat through the riser, and the high-pressure air carrying a large amount of sensible heat is used for other industrial purposes, It can effectively achieve energy saving and consumption reduction.

In order to better understand the technical solution of the present invention, the specific structure of the riser for recovering the waste heat of coke oven waste gas provided by the embodiment of the present invention is exemplarily introduced below with reference to FIG. 1 .

As shown in FIG. 1 , an embodiment of the present invention provides a riser pipe for recovering waste heat from coke oven waste gas, which includes a base 1 , a riser pipe shell and a riser pipe cover that are connected in sequence from bottom to top. The rising pipe casing includes a straight pipe casing 2 and a bridge pipe casing 3, and the straight pipe casing 2 and the bridge pipe casing 3 are connected by segment welding through flanges.

The straight tube shell 2 and the bridge tube shell 3 are both assembled by an inner tube 21 and an outer tube 23; a single-spiral or multi-spiral-rising heat exchange channel 22 is formed between the inner tube 21 and the outer tube 23 ; The value range of the distance d between the inner cylinder 21 and the outer cylinder 23 can be [10mm, 150mm], preferably [20mm, 100mm].

A partition plate 221 is arranged in the heat exchange channel 22. In this embodiment, the partition plate 221 adopts a flange; the partition plate 221 divides the heat exchange channel 22 into multiple sections; each section of the heat exchange channel 22 corresponds to the riser pipe The lower part of the casing is provided with a heat exchange working medium inlet 231 , and the upper part is provided with a heat exchange working medium outlet 232 .

The inner layer of steel plate is built with a rising pipe lining 211; when a large amount of heat exchange is not required, the rising pipe lining is preferably clay bricks, and ceramic fiber heat insulation products or gas can be laid between the clay bricks and the inner cylinder. Gel thermal insulation material; when a large amount of heat exchange is required, silicon carbide products with excellent thermal conductivity are preferred for the lining of the riser.

The outer cylinder 23 is provided with a heat exchange working medium inlet 231 and a heat exchange working medium outlet 232, and the heat exchange working medium inlet 231 and the heat exchange working medium outlet 232 are communicated with the heat exchange channel 22; the heat exchange working medium The inlet 231 is located at the lower part of the riser shell, and the heat exchange working medium outlet 232 is located at the upper part of the riser shell.

A heat exchange working medium is introduced into the heat exchange channel 22 through the heat exchange working medium inlet 231 , and the heat exchange working medium is coal gas, air or hydrogen; the heat exchange working medium exchanges heat in the heat exchange channel 22 Then, it is discharged from the heat exchange working medium outlet 232 . Among them, the arrows in the inner cylinder 21 are used to indicate the flow direction of the raw gas in the rising pipe; the arrows of the heat exchange working medium inlet 231, the heat exchange channel between the inner cylinder 21 and the outer cylinder 23, and the heat exchange working medium outlet 232 are used to indicate The flow direction of the heat exchange medium.

The riser pipe for recovering the waste heat of waste coke oven gas provided by the embodiment of the present invention adopts coal gas, air or hydrogen as the heat exchange working medium to recover the heat loss on the surface of the riser pipe of the coke oven and reduce the surface temperature of the riser pipe. Since gas, air or hydrogen will not flow or splash on the furnace wall of the carbonization chamber to damage the silica bricks, it can solve the problem of easy leakage and damage to the furnace wall of the carbonization chamber in the existing riser pipe using demineralized water as the heat exchange medium.

As shown in FIG. 2 , an embodiment of the present invention further provides a method for utilizing waste heat of a riser, including:

S101, through the gas introduction pipeline, the gas transported by the gas main pipeline is connected to the heat exchange channel of the riser pipe in the above-mentioned embodiment for heat exchange;

Wherein, the gas is blast furnace gas or coke oven gas;

S102, the gas after heat exchange through the heat exchange channel is connected to the return gas pipeline system through a gas outlet pipeline;

Wherein, when the gas is blast furnace gas, the return gas pipeline system is used for heating the blast furnace; when the gas is coke oven gas, the return gas pipeline system is used for coke oven heating.

It can be understood that when the gas transported by the main gas pipeline is blast furnace gas, the blast furnace gas is introduced into the blast furnace return gas pipeline system after being heated by the riser pipe in the above embodiment of the present invention. The moisture in the blast furnace gas is gaseous and will not condense into liquid water, so it can effectively prevent the blast furnace gas from corroding the pipeline system.

Similarly, when the gas transported by the main gas pipeline is coke oven gas, the coke oven gas is introduced into the coke oven return gas pipeline system after being heated by the riser pipe in the above-mentioned embodiment of the present invention. , The moisture in the high temperature coke oven gas is gaseous and will not condense into liquid water, so it can effectively prevent the corrosion of the coke oven gas to the pipeline system.

As shown in FIG. 3 , an embodiment of the present invention also provides a method for utilizing waste heat of a riser, including:

S201, pressurizing ambient air through a fan;

S202, the air pressurized by the fan is connected to the heat exchange channel of the riser pipe of the above-mentioned embodiment through the air introduction pipeline to perform heat exchange;

S203, the air after heat exchange through the heat exchange channel is transported to the air inlet of the coke oven gas exchange cock through an air outlet line.

It can be understood that, in the method for utilizing the waste heat of the riser provided by the embodiment of the present invention, after the air pressurized by the fan passes the heat exchange of the riser in the embodiment of the present invention and heats up, the air of the coke oven gas exchange cock can be introduced through the air outlet line. Inlet; the air that has been boosted and heated by heat exchange can replace the remaining gas in the gas pipeline and the graphite deposited by purging combustion after the coke oven is heated and reversed, so as to prevent the gas pipeline from clogging; in addition, in the gas exchange The positive pressure air can prevent the occurrence of explosion accidents in the coke oven gas pipeline; and the high temperature air can not only prevent the moisture in the air from corroding the pipeline system due to dew point condensation, but also prevent the moisture condensation from scouring the coke oven brick gas channel In order to avoid the leakage of brick and gas ducts.

As shown in FIG. 4 , an embodiment of the present invention also provides a method for utilizing waste heat of a riser, including:

S301, pressurizing the ambient air through a fan;

S302, the air pressurized by the fan is connected to the heat exchange channel of the riser pipe of the above-mentioned embodiment through the air introduction pipeline for heat exchange;

S303, the air after heat exchange through the heat exchange channel is transported to the air inlet of the blast furnace gas exchange cock through an air outlet pipeline.

It can be understood that, in the method for utilizing the waste heat of the riser provided by the embodiment of the present invention, after the air pressurized by the fan passes the heat exchange of the riser in the embodiment of the present invention and heats up, it can be introduced into the air inlet of the blast furnace gas exchange cock through the air outlet line. ; After the blast furnace heating and reversing, the residual gas in the gas pipeline is replaced and the graphite deposited by combustion is purged to prevent the gas pipeline from clogging; in addition, during the gas reversal period, the positive pressure air can prevent the coke oven gas pipeline The explosion accident occurs; and the high temperature air can not only prevent the moisture in the air from corroding the pipeline system due to dew point condensation, but also prevent the moisture condensation from scouring the ash seam in the brick gas channel of the coke oven body, so as to avoid the leakage of the brick gas channel.

As shown in FIG. 5 , an embodiment of the present invention further provides a method for utilizing waste heat of a riser, including:

S401, pressurizing the ambient air through a fan;

S402, the air pressurized by the fan is connected to the heat exchange channel of the riser pipe of the above-mentioned embodiment through the air introduction pipeline for heat exchange;

S403, the air after heat exchange through the heat exchange channel is transported to the air inlet of the coke oven exhaust gas shutter through an air outlet pipeline.

In the method for utilizing the waste heat of the riser provided by the embodiment of the present invention, after the air pressurized by the fan passes the heat exchange of the riser in the embodiment of the present invention and heats up, it can also be connected to the air inlet of the coke oven exhaust gas switch through the air outlet pipeline, Combustion air for coke oven heating.

As shown in FIG. 6 , an embodiment of the present invention further provides a method for utilizing waste heat of a riser, including:

S501, pressurizing the ambient air through a fan;

S502, the air pressurized by the fan is connected to the heat exchange channel of the riser pipe of the above-mentioned embodiment through the air introduction pipeline for heat exchange;

S503, the air after heat exchange through the heat exchange channel is transported to the gas inlet of the coke oven exhaust gas switch through an air outlet pipeline.

In the method for utilizing the waste heat of the riser provided by the embodiment of the present invention, after the air pressurized by the fan passes the heat exchange of the riser in the embodiment of the present invention and heats up, it can also be connected to the gas inlet of the coke oven exhaust gas switch through the air outlet pipeline, It is used to replace the gas inside the regenerator after the coke oven heating and reversing.

In addition, the heat exchange working fluid after heat exchange in the heat exchange channel of the riser in the embodiment of the present invention can also be supplied to the flue gas reheating device in the exhaust gas desulfurization and destocking system, that is, a gas-gas heat exchanger (GGH) for flue gas. The flue gas before being discharged can be reheated to heat up; or, it can be used in any other industrial places and heat exchange devices that need heat preservation and heat exchange, so as to realize the comprehensive utilization of energy.

The above are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims (8)

1. The ascending tube for recovering the waste heat of the coke oven crude gas is characterized by comprising a base (1), an ascending tube shell and an ascending tube cover which are sequentially connected from bottom to top;

the ascending pipe shell is formed by sleeving an inner cylinder (21) and an outer cylinder (23); a heat exchange channel (22) is formed between the inner cylinder (21) and the outer cylinder (23); a riser lining (211) is built in the inner steel plate;

the outer cylinder (23) is provided with a heat exchange working medium inlet (231) and a heat exchange working medium outlet (232), and the heat exchange working medium inlet (231) and the heat exchange working medium outlet (232) are communicated with the heat exchange channel (22); the heat exchange working medium inlet (231) is positioned at the lower part of the riser shell, and the heat exchange working medium outlet (232) is positioned at the upper part of the riser shell;

introducing a heat exchange working medium into the heat exchange channel (22) through the heat exchange working medium inlet (231), wherein the heat exchange working medium is coal gas or air or hydrogen; and the heat exchange working medium is discharged from the heat exchange working medium outlet (232) after heat exchange in the heat exchange channel (22).

2. The riser of claim 1, wherein a partition (221) is provided in the heat exchange channel (22), the partition (221) dividing the heat exchange channel (22) into a plurality of sections;

each section of heat exchange channel (22) is provided with a heat exchange working medium inlet (231) corresponding to the lower part of the riser shell, and a heat exchange working medium outlet (232) is arranged at the upper part of the riser shell.

3. The riser of claim 1 or 2, wherein the heat exchange channels (22) are helically ascending heat exchange channels, the helically ascending heat exchange channels being single helically ascending heat exchange channels or multiple helically ascending heat exchange channels.

4. The riser according to claim 1, characterised in that the distance d between the inner (21) and outer (23) cylinders ranges from [10mm, 150mm ].

5. Riser pipe according to claim 4, characterised in that the distance d between the inner and outer cylinders (21, 23) has a value in the range [20mm, 100mm ].

6. The riser as claimed in claim 1, characterised in that the riser housing comprises a straight pipe housing (2) and a bridge pipe housing (3), the straight pipe housing (2) and the bridge pipe housing (3) being welded in sections.

7. A riser waste heat utilization method is characterized by comprising the following steps:

connecting the coal gas conveyed by a coal gas main pipeline into a heat exchange channel of the ascending pipe according to any one of claims 1 to 6 through a coal gas introducing pipeline for heat exchange; wherein the coal gas is blast furnace gas or coke oven gas;

the coal gas after heat exchange through the heat exchange channel is connected into a return coal gas pipeline system through a coal gas outlet pipeline; when the coal gas is blast furnace coal gas, the return coal gas pipeline system is used for heating the blast furnace; when the coal gas is coke oven gas, the return coal gas pipeline system is used for heating the coke oven.

8. A riser waste heat utilization method is characterized by comprising the following steps:

pressurizing ambient air by a fan;

connecting the air pressurized by the fan into the heat exchange channel of the ascending pipe according to any one of claims 1 to 6 through an air inlet pipeline for heat exchange;

the air after heat exchange through the heat exchange channel is conveyed to a designated air inlet through an air outlet pipeline; wherein the designated air inlet comprises an air inlet of a coke oven gas exchange cock and/or an air inlet of a blast furnace gas exchange cock and/or an air inlet of a coke oven exhaust gas shutter and/or a gas inlet of a coke oven exhaust gas shutter.

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