CN212293415U - Coke oven crude gas waste heat utilization system - Google Patents

Coke oven crude gas waste heat utilization system Download PDF

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Publication number
CN212293415U
CN212293415U CN202020918066.XU CN202020918066U CN212293415U CN 212293415 U CN212293415 U CN 212293415U CN 202020918066 U CN202020918066 U CN 202020918066U CN 212293415 U CN212293415 U CN 212293415U
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heat exchange
pipe
tube
rich oil
branch
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张美玲
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Huatai Yongchuang Beijing Technology Co ltd
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Huatai Yongchuang Beijing Technology Co ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency
    • Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/50—Improvements relating to the production of bulk chemicals
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

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Abstract

The embodiment of the utility model provides a coke oven raw coke oven gas waste heat utilization system. The coke oven crude gas waste heat utilization system comprises a coke oven, a crude benzene distillation device and a debenzolization tower; the ascending pipe of the coke oven comprises an ascending pipe body and a heat exchange pipe; the heat exchange tube is fixedly arranged in the ascending tube body and is used for absorbing the heat of the raw coke oven gas flowing through the ascending tube body; the inlet end of the heat exchange tube is connected with a first branch tube, and the heat exchange tube is connected with a crude benzene distillation device through the first branch tube; the outlet end of the heat exchange tube is connected with a second branch tube, and the heat exchange tube is connected with the debenzolization tower through the second branch tube; the first branch pipe is provided with a flow meter for monitoring the rich oil flow at the inlet of the heat exchange pipe and an adjusting valve for adjusting the rich oil flow at the inlet of the heat exchange pipe; the second branch pipe is provided with a temperature measuring meter for measuring the temperature of the outlet rich oil. The scheme can reduce the cost of distilling and extracting crude benzene from rich oil in the debenzolization tower.

Description

Coke oven crude gas waste heat utilization system
Technical Field
The utility model relates to a coke oven raw gas waste heat utilization technology field especially relates to a coke oven raw gas waste heat utilization system.
Background
In the traditional coking crude benzene production process, after benzene washing is carried out by a crude benzene distillation device, rich oil after crude benzene treatment is absorbed, the rich oil is usually sent into a tube furnace or a rich oil heater for heating, and then sent into a debenzolization tower for distillation so as to extract crude benzene. Wherein, the tubular furnace takes coal gas as a heating source, and a large amount of coal gas resources are consumed; the rich oil heater uses steam as a heating source, and a large amount of steam resources are consumed.
Because the tube furnace or the rich oil heater is adopted to heat the rich oil, coal gas resources or steam resources are consumed, so that the cost for distilling and extracting crude benzene from the rich oil in the debenzolization tower is higher.
SUMMERY OF THE UTILITY MODEL
An object of the embodiment of the utility model is to provide a coke oven raw coke oven gas waste heat utilization system for reduce the cost that rich oil distilled and extracted crude benzene in the debenzolization tower. The specific technical scheme is as follows:
in a first aspect, the embodiment of the utility model provides a coke oven crude gas waste heat utilization system, which comprises a coke oven, a crude benzene distillation device and a debenzolization tower;
the ascending pipe of the coke oven comprises an ascending pipe body and a heat exchange pipe; the heat exchange tube is fixedly arranged in the ascending tube body and is used for absorbing heat of raw coke oven gas flowing through the ascending tube body;
the inlet end of the heat exchange tube is connected with a first branch tube, and the heat exchange tube is connected with the crude benzene distillation device through the first branch tube and is used for receiving rich oil produced by the crude benzene distillation device;
the outlet end of the heat exchange tube is connected with a second branch tube, the heat exchange tube is connected with the debenzolization tower through the second branch tube, so that rich oil heated by the heat exchange tube is input into the debenzolization tower and is used for distilling and extracting crude benzene in the debenzolization tower;
the first branch pipe is provided with a flow meter for monitoring the rich oil flow at the inlet of the heat exchange pipe and an adjusting valve for adjusting the rich oil flow at the inlet of the heat exchange pipe; the second branch pipe is provided with a temperature meter for measuring the rich oil temperature at the outlet of the heat exchange pipe.
Optionally, the first branch pipe is also provided with a first cut-off valve for controlling the opening and closing of the inlet of the heat exchange pipe; the second branch pipe is also provided with a second cut-off valve used for controlling the opening and closing of the outlet of the heat exchange pipe.
Optionally, the coke oven comprises a plurality of carbonization chambers, the riser of each carbonization chamber comprising one of the heat exchange tubes;
a first branch pipe connected with the inlet ends of the plurality of heat exchange pipes is connected into the same rich oil inlet main trunk pipe; the rich oil inlet main trunk pipe is connected with a liquid outlet of the crude benzene distillation device;
second branch pipes connected with the outlet ends of the plurality of heat exchange pipes are connected into the same rich oil outlet main pipe; the rich oil outlet main pipe is connected with the liquid inlet of the debenzolization tower.
Optionally, the heat exchange tube, the first branch tube, the second branch tube, the rich oil inlet main tube and the rich oil outlet main tube are all made of high-temperature-resistant and rich oil corrosion-resistant tubes.
Optionally, the heat exchange tube is a tube array, a spiral coil or a sleeve.
Optionally, the riser body is provided with a first through hole and a second through hole;
the inlet end of the heat exchange tube penetrates through the first through hole to extend out of the ascending tube body and is connected with the first branch tube;
the outlet end of the heat exchange tube penetrates through the second through hole to extend out of the ascending tube body and is connected with the second branch tube.
Optionally, the riser cover of the riser body is provided with the first through hole and the second through hole;
or the first through hole and the second through hole are formed in the side wall of the ascending pipe body.
Optionally, the inlet end of the heat exchange tube is connected with the first branch tube through a flange; the outlet end of the heat exchange tube is connected with the second branch tube through a flange.
In a second aspect, the embodiment of the present invention further provides a method for utilizing waste heat of raw coke oven gas applied to the system for utilizing waste heat of raw coke oven gas in the first aspect, which includes:
conveying the rich oil produced by the crude benzene distillation device to a heat exchange tube in the riser body for heating through a first branch tube connected with the crude benzene distillation device;
based on temperature data measured by a temperature meter on a second branch pipe and flow data measured by a flow meter on the first branch pipe, regulating the outlet flow of the heat exchange pipe by controlling a regulating valve on the first branch pipe to enable the rich oil temperature to reach a preset temperature;
and inputting the rich oil reaching the preset temperature after heat exchange through the heat exchange tube into a debenzolization tower through a second branch tube (7) for distilling and extracting crude benzene in the debenzolization tower.
The embodiment of the utility model provides an in the scheme, heat the rich oil through the heat exchange tube in the ascending pipe of coke oven in the system, and need not to provide the gas resource or provide the steam resource for the rich oil heater for the tubular furnace, consequently, can reduce the cost that the crude benzene was drawed in the distillation of rich oil in the debenzolization tower. In addition, the tube furnace or the rich oil heater is eliminated, so that equipment purchase and maintenance cost of the tube furnace or the rich oil heater can be saved. In addition, the problem of environmental pollution caused by the tail gas emission of the tube furnace is also avoided due to the elimination of the tube furnace.
In addition, the heat exchange tubes in the coke oven ascension pipes absorb the heat of the coke oven raw gas, so that the heat of the coke oven raw gas can be utilized more fully, the heat efficiency is effectively improved, the pressure grade of the ascension pipes is obviously reduced, and the stable operation of the coke oven ascension pipes is facilitated. And because the flow velocity of the rich oil in the ascending pipe is fast, the area is small, and the required heat is less, the temperature of the raw coke oven gas in the ascending pipe is reduced, and the pipeline can not be blocked by the adhesion of viscous liquid such as tar.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a coke oven in a coke oven crude gas waste heat utilization system provided by an embodiment of the present invention;
FIG. 2 is a top view of a rising pipe of a coke oven in the coke oven crude gas waste heat utilization system provided in FIG. 1.
The reference numerals in the drawings are explained as follows:
1-coke oven body;
2-ascending pipe, 21-ascending pipe body, 22-heat exchange pipe;
3-bridge tube, 31-bridge tube turning plate;
4, a gas collecting pipe;
5-main pipe of rich oil inlet
6-a first branch pipe, 61-a flow meter, 62-a regulating valve, 63-a first cut-off valve;
7-a second branch pipe, 71-a temperature measuring meter and 72-a second cut-off valve;
8-main trunk pipe of rich oil outlet;
9-flange.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The prior art that the rich oil is heated by adopting a tubular furnace or a rich oil heater and then sent into a debenzolization tower to be distilled to extract crude benzene has great energy consumption. Although the tube furnace or the rich oil heater has been improved in various ways in recent years, the substantial problem of high energy consumption in the rich oil heating process has not been solved.
The temperature of the raw coke oven gas discharged from the coke oven carbonization chamber and conveyed by the riser is up to 650-850 ℃. In the existing coking and gas purification process of a coking plant, a large amount of circulating ammonia water is sprayed to cool raw coke gas, part of the circulating ammonia water in an ascending pipe evaporates and absorbs heat, the raw coke gas is preliminarily cooled to 82 ℃, and then the raw coke gas is further cooled to 21-22 ℃ by circulating water and low-temperature water through a primary cooler. In the process, the raw gas is cooled, so that a large amount of waste heat of the raw gas is wasted, and a large amount of cooling water and electric energy are consumed.
The demand of the high energy consumption of rich oil heating in the above-mentioned one side crude benzol extraction technology, the condition of the waste of the abundant energy of on the other hand coke oven crude gas cooling, in order to solve the consumption of how to reduce rich oil heating in-process coal gas or steam to reduce crude benzol manufacturing cost's problem, the embodiment of the utility model provides a coke oven crude gas waste heat utilization system and method.
The following first introduces a system for utilizing waste heat of raw coke oven gas provided by the embodiment of the present invention.
The embodiment of the utility model provides a coke oven crude gas waste heat utilization system, which comprises a coke oven, a crude benzene distillation device and a debenzolization tower;
the ascending pipe of the coke oven comprises an ascending pipe body and a heat exchange pipe; the heat exchange tube is fixedly arranged in the ascending tube body and is used for absorbing heat of raw coke oven gas flowing through the ascending tube body;
the inlet end of the heat exchange tube is connected with a first branch tube, and the heat exchange tube is connected with the crude benzene distillation device through the first branch tube and is used for receiving rich oil produced by the crude benzene distillation device;
the outlet end of the heat exchange tube is connected with a second branch tube, the heat exchange tube is connected with the debenzolization tower through the second branch tube, so that rich oil heated by the heat exchange tube is input into the debenzolization tower and is used for distilling and extracting crude benzene in the debenzolization tower;
the first branch pipe is provided with a flow meter for monitoring the rich oil flow at the inlet of the heat exchange pipe and an adjusting valve for adjusting the rich oil flow at the inlet of the heat exchange pipe; the second branch pipe is provided with a temperature meter for measuring the rich oil temperature at the outlet of the heat exchange pipe.
It should be noted that the raw coke oven gas in the ascending pipe flows outside the heat exchange pipe, and the rich oil conveyed by the crude benzene distillation device flows inside the heat exchange pipe, and as the raw coke oven gas of the high-temperature coke oven and the rich oil in the heat exchange pipe perform reverse heat exchange in the ascending pipe, the temperature difference between the high-temperature coke oven gas and the rich oil is large, the heat transfer coefficient is large, and a good heat transfer effect can be achieved.
It can be understood that the rich oil flow entering the heat exchange tube for heat exchange is adjusted according to the temperature of the rich oil after heat exchange, and the purpose of stabilizing the temperature of the rich oil within a certain preset temperature range can be achieved. Specifically, if the rich oil temperature measured by the temperature meter on the second branch pipe is lower than the preset temperature required by the crude benzene distillation and extraction of the debenzolization tower, the regulating valve can be controlled according to the flow displayed by the flow meter, so that the rich oil stays in the heat exchange pipe for a longer time, more heat is obtained, and the rich oil temperature is increased to the preset temperature; on the contrary, if the rich oil temperature measured by the temperature measuring meter is higher than the preset temperature required by the crude benzene distillation and extraction of the debenzolization tower, the regulating valve can be controlled according to the flow displayed by the flow meter, so that the residence time of the rich oil in the heat exchange tube is reduced, the heat obtained by the rich oil is reduced, and the rich oil temperature is reduced to the preset temperature. Therefore, the rich oil temperature can reach the required preset temperature through the temperature measuring meter, the flow meter and the regulating valve.
In order to prolong the service life of the regulating valve, the flow meter and the temperature measuring meter and ensure the working reliability of the regulating valve and the temperature measuring meter, the regulating valve can adopt any regulating valve which can adapt to the working temperature, pressure and corrosivity of rich oil, the flow meter can adopt any flow meter which can adapt to the working temperature, pressure and corrosivity of rich oil, and the temperature measuring meter can adopt any temperature measuring meter which can meet the working temperature, pressure and corrosivity of rich oil.
In addition, in the embodiment of the utility model, rich oil is carried to the heat exchange tube heat transfer back of coke oven tedge from crude benzol distillation plant through the pipeline, returns the debenzolization tower, and the heat transfer process is closed circuit, except the horizontal resistance loss on the way, does not have the height to the resistance loss, make full use of the altitude difference potential energy of coke oven.
The embodiment of the utility model provides an in the scheme, heat the rich oil through the heat exchange tube in the ascending pipe of coke oven in the system, and need not to provide the gas resource or provide the steam resource for the rich oil heater for the tubular furnace, consequently, can reduce the cost that the crude benzene was drawed in the distillation of rich oil in the debenzolization tower. In addition, the tube furnace or the rich oil heater is eliminated, so that equipment purchase and maintenance cost of the tube furnace or the rich oil heater can be saved. In addition, the problem of environmental pollution caused by the tail gas emission of the tube furnace is also avoided due to the elimination of the tube furnace.
In addition, the heat exchange tubes in the coke oven ascension pipes absorb the heat of the coke oven raw gas, so that the heat of the coke oven raw gas can be utilized more fully, the heat efficiency is effectively improved, the pressure grade of the ascension pipes is obviously reduced, and the stable operation of the coke oven ascension pipes is facilitated. And because the flow velocity of the rich oil in the ascending pipe is fast, the area is small, and the required heat is less, the temperature of the raw coke oven gas in the ascending pipe is reduced, and the pipeline can not be blocked by the adhesion of viscous liquid such as tar.
Optionally, in order to facilitate the maintenance of the heat exchange tube of the riser, the first branch tube is further provided with a first cut-off valve for controlling the opening and closing of the inlet of the heat exchange tube; the second branch pipe is also provided with a second cut-off valve used for controlling the opening and closing of the outlet of the heat exchange pipe.
Optionally, the coke oven comprises a plurality of carbonization chambers, and in order to recycle the waste heat of the coke oven crude gas as much as possible, the ascending pipe of each carbonization chamber comprises one heat exchange pipe;
a first branch pipe connected with the inlet ends of the plurality of heat exchange pipes is connected into the same rich oil inlet main trunk pipe; the rich oil inlet main trunk pipe is connected with a liquid outlet of the crude benzene distillation device;
second branch pipes connected with the outlet ends of the plurality of heat exchange pipes are connected into the same rich oil outlet main pipe; the rich oil outlet main pipe is connected with the liquid inlet of the debenzolization tower.
It can be understood that the heat exchange tubes are arranged on the ascending tubes of each carbonization chamber, and the rich oil in the heat exchange tubes corresponding to the ascending tubes of the carbonization chamber is collected into the main tube for conveying, so that the waste heat of the coke oven crude gas can be better utilized.
Optionally, in order to provide service lives of the heat exchange tube, the first branch tube, the second branch tube, the rich oil inlet main tube and the rich oil outlet main tube, ensure reliable operation of equipment and reduce the probability of equipment accidents, the heat exchange tube, the first branch tube, the second branch tube, the rich oil inlet main tube and the rich oil outlet main tube are all made of high-temperature-resistant and rich oil corrosion-resistant tubes. For example, the heat exchange tube may be made of 310S stainless steel, 904L stainless steel, etc., and the other tubes may be made of 20# steel, 304 stainless steel, 310S stainless steel, 904L stainless steel, etc.
Optionally, the heat exchange tube may be a tube array, a spiral coil or a sleeve, in order to facilitate the extraction of the heat exchange tube from the riser and the maintenance and replacement of the heat exchange tube. Of course, the form of the heat exchange pipe is not limited thereto.
Optionally, the riser body is provided with a first through hole and a second through hole;
the inlet end of the heat exchange tube penetrates through the first through hole to extend out of the ascending tube body and is connected with the first branch tube;
the outlet end of the heat exchange tube penetrates through the second through hole to extend out of the ascending tube body and is connected with the second branch tube.
Exemplarily, the riser cover of the riser body is provided with the first through hole and the second through hole;
or the first through hole and the second through hole are formed in the side wall of the ascending pipe body.
It will be appreciated that the heat exchange tubes may be welded to the riser cap of the riser body or to the side wall of the riser body.
Optionally, in order to facilitate the disassembly and assembly of the heat exchange tube in the overhaul and maintenance and improve the efficiency of the overhaul and maintenance of the equipment, the inlet end of the heat exchange tube is connected with the first branch tube through a flange; the outlet end of the heat exchange tube is connected with the second branch tube through a flange. It is understood that the heat exchange pipe and the branch pipe may be connected by welding.
Based on foretell coke oven raw coke oven gas waste heat utilization system, the embodiment of the utility model also provides a coke oven raw coke oven gas waste heat utilization method. The embodiment of the utility model provides a still provide a coke oven raw coke oven gas waste heat utilization method can include following step:
step one, through the first branch pipe connected with the crude benzene distillation device, the rich oil produced by the crude benzene distillation device is conveyed to the heat exchange pipe in the riser body of the system provided by the embodiment of the utility model for heating;
secondly, regulating the outlet flow of the heat exchange tube by controlling a regulating valve on the first branch tube based on temperature data measured by a temperature meter on the second branch tube and flow data measured by a flow meter on the first branch tube, so that the rich oil temperature reaches a preset temperature;
it can be understood that the rich oil flow entering the heat exchange tube for heat exchange is adjusted according to the temperature of the rich oil after heat exchange, and the purpose of stabilizing the temperature of the rich oil within a certain preset temperature range can be achieved.
Specifically, under the condition that the rich oil temperature measured by the temperature measuring meter on the second branch pipe is lower than the preset temperature required by the crude benzene distillation and extraction of the debenzolization tower, the regulating valve can be controlled according to the flow displayed by the flow meter, so that the rich oil stays in the heat exchange pipe for a longer time, more heat is obtained, and the rich oil temperature is increased to the preset temperature; on the contrary, for the condition that the rich oil temperature measured by the temperature measuring meter is higher than the preset temperature required by the crude benzene distillation and extraction of the debenzolization tower, the regulating valve can be controlled according to the flow displayed by the flow meter, so that the residence time of the rich oil in the heat exchange tube is reduced, the heat obtained by the rich oil is reduced, and the rich oil temperature is reduced to the preset temperature. Therefore, the rich oil temperature can reach the required preset temperature through the temperature measuring meter, the flow meter and the regulating valve.
And step three, inputting the rich oil reaching the preset temperature after heat exchange through the heat exchange tube into a debenzolization tower through a second branch tube, and distilling and extracting crude benzene by using the debenzolization tower.
The embodiment of the utility model provides an in the scheme, heat the rich oil through the heat exchange tube in the ascending pipe of coke oven in the system, and need not to provide the gas resource or provide the steam resource for the rich oil heater for the tubular furnace, consequently, can reduce the cost that the crude benzene was drawed in the distillation of rich oil in the debenzolization tower. In addition, the tube furnace or the rich oil heater is eliminated, so that equipment purchase and maintenance cost of the tube furnace or the rich oil heater can be saved. In addition, the problem of environmental pollution caused by the tail gas emission of the tube furnace is also avoided due to the elimination of the tube furnace.
In order to better understand the technical solution of the present invention, the following describes, by way of example, the specific structure of the coke oven raw gas waste heat utilization system provided by the embodiment of the present invention with reference to fig. 1 and 2.
The embodiment of the utility model provides a coke oven crude gas waste heat utilization system, including coke oven, crude benzol distillation plant and debenzolization tower. Referring to fig. 1, the coke oven comprises a coke oven body 1, an ascending pipe 2, a bridge pipe 3 and a gas collecting pipe 4, wherein a bridge pipe turning plate 31 is arranged in the bridge pipe 3. Wherein, the bridge pipe 3 is used for connecting the ascending pipe 2 and the gas collecting pipe 4. The gas collecting pipe 4 is a collecting pipe of crude gas in all the ascending pipes 2 of the coke oven. The bridge tube turnover plate 31 is an adjusting valve for raw gas entering the path of the gas collecting tube 4 from the ascending tube 2, and is used for adjusting the pressure of the gas collecting tube 4 and ensuring the operating pressure in the coke oven.
As shown in fig. 1 and 2, the ascending tube 2 comprises an ascending tube body 21 and a heat exchange tube 22; wherein the heat exchange tube 22 can be a tube array, a spiral coil or a sleeve. The heat exchange pipe 22 is fixedly arranged in the ascending pipe body 21 and is used for absorbing heat of the crude gas flowing through the ascending pipe body 21.
The rising pipe body 21 is provided with a first through hole and a second through hole. The inlet end of the heat exchange tube 22 penetrates through the first through hole to extend out of the ascending tube body 21 and is connected with the first branch tube 6 through the flange 9, the first branch tube 6 is connected with the rich oil inlet main trunk tube 5, and the heat exchange tube 22 is connected with a liquid outlet of the crude benzene distillation device through the first branch tube 6 and the rich oil inlet main trunk tube 5 and is used for receiving rich oil produced by the crude benzene distillation device. The outlet end of the heat exchange tube 22 penetrates through the second through hole to extend out of the ascending tube body 21 and is connected with the second branch tube 7 through the flange 9, the second branch tube 7 is connected with the rich oil outlet main tube 8, and the heat exchange tube 22 is connected with the liquid inlet of the debenzolization tower through the second branch tube 7 and the rich oil outlet main tube 8, so that rich oil heated by the heat exchange tube 22 is input into the debenzolization tower and is used for distilling and extracting crude benzene in the debenzolization tower. Note that, for better distinction of the rich oil inlet trunk pipe 5, the first branch pipe 6, the second branch pipe 7, and the rich oil outlet trunk pipe 8, in fig. 1, the first branch pipe 6 and the second branch pipe 7 are shown by lines, and the rich oil inlet trunk pipe 5 and the rich oil outlet trunk pipe 8 are shown by circles.
The first branch pipe 6 is provided with a flow meter 61 for monitoring the rich oil flow at the inlet of the heat exchange pipe 22, a regulating valve 62 for regulating the rich oil flow at the inlet of the heat exchange pipe 22 and a first cut-off valve 63 for controlling the opening and closing of the inlet of the heat exchange pipe 22; the second branch pipe 7 is provided with a temperature measuring meter 71 for measuring the outlet rich oil temperature and a second cut-off valve 72 for controlling the opening and closing of the outlet of the heat exchange pipe 22.
The embodiment of the utility model provides a system can be through the first branch pipe 6 of being connected with crude benzol distillation plant, carries the rich oil of crude benzol distillation plant output to the heat exchange tube 22 in the ascending pipe body 21 of system and heats. It is understood that a pump may be provided at the outlet end of the crude benzene distillation unit to pressurize the rich oil in order to achieve smooth transfer of the rich oil.
Based on the temperature data measured by the temperature measuring meter 71 on the second branch pipe 7 and the flow data measured by the flow meter 61 on the first branch pipe 6, the outlet flow of the heat exchange pipe 22 is adjusted by controlling the adjusting valve 62 on the first branch pipe 6, so that the rich oil temperature reaches the preset temperature.
The rich oil which has reached the preset temperature after heat exchange through the heat exchange tube 22 is input into the debenzolization tower through the second branch tube 7 and is used for distilling and extracting crude benzene in the debenzolization tower. The preset temperature is the temperature required by rich oil in the debenzolization process, and can be determined according to the actual situation.
The embodiment of the utility model provides an in the scheme, heat the rich oil through the heat exchange tube in the ascending pipe of coke oven in the system, and need not to provide the gas resource or provide the steam resource for the rich oil heater for the tubular furnace, consequently, can reduce the cost that the crude benzene was drawed in the distillation of rich oil in the debenzolization tower. In addition, the tube furnace or the rich oil heater is eliminated, so that equipment purchase and maintenance cost of the tube furnace or the rich oil heater can be saved. In addition, the problem of environmental pollution caused by the tail gas emission of the tube furnace is also avoided due to the elimination of the tube furnace.
In addition, the heat exchange tubes in the coke oven ascension pipes absorb the heat of the coke oven raw gas, so that the heat of the coke oven raw gas can be utilized more fully, the heat efficiency is effectively improved, the pressure grade of the ascension pipes is obviously reduced, and the stable operation of the coke oven ascension pipes is facilitated. And because the flow velocity of the rich oil in the ascending pipe is fast, the area is small, and the required heat is less, the temperature of the raw coke oven gas in the ascending pipe is reduced, and the pipeline can not be blocked by the adhesion of viscous liquid such as tar.
The above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.

Claims (8)

1. A coke oven crude gas waste heat utilization system is characterized by comprising a coke oven, a crude benzene distillation device and a debenzolization tower;
the ascending pipe (2) of the coke oven comprises an ascending pipe body (21) and a heat exchange pipe (22); the heat exchange pipe (22) is fixedly arranged in the ascending pipe body (21) and is used for absorbing heat of crude gas flowing through the ascending pipe body (21);
the inlet end of the heat exchange pipe (22) is connected with a first branch pipe (6), and the heat exchange pipe (22) is connected with the crude benzene distillation device through the first branch pipe (6) and is used for receiving rich oil produced by the crude benzene distillation device;
the outlet end of the heat exchange tube (22) is connected with a second branch tube (7), the heat exchange tube (22) is connected with the debenzolization tower through the second branch tube (7), so that rich oil heated by the heat exchange tube (22) is input into the debenzolization tower and is used for distilling and extracting crude benzene in the debenzolization tower;
the first branch pipe (6) is provided with a flow meter (61) for monitoring the rich oil flow at the inlet of the heat exchange pipe (22) and a regulating valve (62) for regulating the rich oil flow at the inlet of the heat exchange pipe (22); the second branch pipe (7) is provided with a temperature measuring meter (71) for measuring the temperature of rich oil at the outlet of the heat exchange pipe (22).
2. The system according to claim 1, wherein the first branch pipe (6) is further provided with a first cut-off valve (63) for controlling opening and closing of an inlet of the heat exchange pipe (22); the second branch pipe (7) is also provided with a second cut-off valve (72) for controlling the opening and closing of the outlet of the heat exchange pipe (22).
3. The system according to claim 1 or 2, characterized in that the coke oven comprises a plurality of carbonization chambers, the riser (2) of each carbonization chamber comprising one of said heat exchange tubes (22);
a first branch pipe (6) connected with the inlet ends of a plurality of heat exchange pipes (22) is connected into the same rich oil inlet main pipe (5); the rich oil inlet main trunk pipe (5) is connected with a liquid outlet of the crude benzene distillation device;
second branch pipes (7) connected with the outlet ends of the plurality of heat exchange pipes (22) are connected into the same rich oil outlet main pipe (8); the main trunk pipe (8) of the rich oil outlet is connected with the liquid inlet of the debenzolization tower.
4. The system according to claim 3, wherein the heat exchange pipe (22), the first branch pipe (6), the second branch pipe (7), the rich oil inlet trunk pipe (5) and the rich oil outlet trunk pipe (8) are all made of high temperature and rich oil corrosion resistant pipes.
5. The system of claim 1, wherein the heat exchange tubes (22) are tubes, spiral coils, or sleeves.
6. The system according to claim 1, characterized in that said riser body (21) is provided with a first through hole and a second through hole;
the inlet end of the heat exchange tube (22) penetrates through the first through hole, extends out of the ascending tube body (21), and is connected with the first branch tube (6);
the outlet end of the heat exchange tube (22) penetrates through the second through hole to extend out of the ascending tube body (21) and is connected with the second branch tube (7).
7. The system according to claim 6, characterized in that the riser cover of the riser body (21) is provided with said first and second through holes;
or the first through hole and the second through hole are arranged on the side wall of the ascending pipe body (21).
8. The system according to claim 1, wherein the inlet end of the heat exchange tube (22) is connected to the first branch tube (6) by a flange (9); the outlet end of the heat exchange tube (22) is connected with the second branch tube (7) through a flange (9).
CN202020918066.XU 2020-05-27 2020-05-27 Coke oven crude gas waste heat utilization system Active CN212293415U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111518574A (en) * 2020-05-27 2020-08-11 华泰永创(北京)科技股份有限公司 Coke oven crude gas waste heat utilization system and method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111518574A (en) * 2020-05-27 2020-08-11 华泰永创(北京)科技股份有限公司 Coke oven crude gas waste heat utilization system and method

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