CN111518573A - Coke oven crude gas waste heat utilization system and method - Google Patents
Coke oven crude gas waste heat utilization system and method Download PDFInfo
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- CN111518573A CN111518573A CN202010460089.5A CN202010460089A CN111518573A CN 111518573 A CN111518573 A CN 111518573A CN 202010460089 A CN202010460089 A CN 202010460089A CN 111518573 A CN111518573 A CN 111518573A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B27/00—Arrangements for withdrawal of the distillation gases
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/02—Preparation, purification or separation of ammonia
- C01C1/024—Purification
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/043—Details
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/16—Treatment of water, waste water, or sewage by heating by distillation or evaporation using waste heat from other processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D21/0001—Recuperative heat exchangers
- F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
- F28D21/001—Recuperative heat exchangers the heat being recuperated from exhaust gases for thermal power plants or industrial processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
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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
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Abstract
The embodiment of the invention provides a system and a method for utilizing waste heat of raw coke oven gas. The coke oven crude gas waste heat utilization system comprises a coke oven and an ammonia still; 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; the inlet end of the heat exchange tube is connected with the first branch tube, and the outlet end of the heat exchange tube is connected with the second branch tube; the first branch pipe and the second branch pipe are respectively connected with the ammonia still; the first branch pipe is provided with a flow meter for monitoring the flow of the ammonia evaporation wastewater at the inlet of the heat exchange pipe and an adjusting valve for adjusting the flow of the ammonia evaporation wastewater 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 ammonia distillation wastewater at the outlet of the heat exchange pipe. The method can reduce the cost of ammonia gas obtained by rectifying ammonia water in the ammonia still.
Description
Technical Field
The invention relates to the technical field of waste heat utilization of raw gas of a coke oven, in particular to a waste heat utilization system and method of raw gas of the coke oven.
Background
In the production process of the coke oven, crude coke oven gas is initially cooled to form ammonia water, wherein most of the ammonia water is used as circulating ammonia water, and the redundant discharged part is called residual ammonia water. In order to extract and utilize ammonia in the residual ammonia water, the residual ammonia water is sent to an ammonia still for rectification, concentrated ammonia gas is obtained at the tower top, and ammonia still wastewater containing less ammonia is obtained at the tower bottom.
At present, a tubular furnace or a reboiler is generally adopted to heat ammonia distillation wastewater at the bottom of an ammonia distillation tower, so that the ammonia distillation wastewater is vaporized into saturated steam and returns to the bottom of the ammonia distillation tower to provide distillation heat for the ammonia distillation tower. Wherein, the tubular furnace takes coal gas as a heating source, and a large amount of coal gas resources are consumed; the reboiler uses steam as a heating source, and a large amount of steam resources are consumed.
As the tubular furnace or the reboiler is adopted to heat the ammonia distillation wastewater, a large amount of coal gas resources or steam resources are consumed, so that the cost for obtaining ammonia gas by rectifying ammonia water in the ammonia distillation tower is higher.
Disclosure of Invention
The embodiment of the invention aims to provide a system and a method for utilizing waste heat of raw gas of a coke oven, which are used for reducing the cost of ammonia gas obtained by rectifying ammonia water in an ammonia still. The specific technical scheme is as follows:
in a first aspect, the embodiment of the invention provides a system for utilizing waste heat of raw gas in a coke oven, which comprises a coke oven and an ammonia still;
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 the first branch tube, and the outlet end of the heat exchange tube is connected with the second branch tube; the first branch pipe and the second branch pipe are respectively connected with the ammonia still and used for enabling ammonia still wastewater at the bottom of the ammonia still to be conveyed into the heat exchange pipe from the first branch pipe for heating and then to be output back to the bottom of the ammonia still through the second branch pipe;
the first branch pipe is provided with a flow meter for monitoring the flow of the ammonia evaporation wastewater at the inlet of the heat exchange pipe and an adjusting valve for adjusting the flow of the ammonia evaporation wastewater 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 ammonia distillation wastewater 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 ammonia distillation wastewater inlet main trunk pipe; the ammonia distillation wastewater inlet main pipe is connected with the ammonia distillation tower;
second branch pipes connected with the outlet ends of the plurality of heat exchange pipes are connected to the same ammonia distillation wastewater outlet main pipe; and the main pipe of the ammonia distillation wastewater outlet is connected with the ammonia distillation tower.
Optionally, the heat exchange tube, the first branch tube, the second branch tube, the ammonia distillation wastewater inlet main tube and the ammonia distillation wastewater outlet main tube are all made of high-temperature-resistant and ammonia distillation wastewater 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, an 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, including:
conveying ammonia distillation wastewater at the bottom of the ammonia distillation tower to a heat exchange pipe in the ascending pipe body for heating through a first branch pipe connected with the ammonia distillation tower;
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 flow of the ammonia distillation wastewater at the outlet of the heat exchange pipe by controlling a regulating valve on the first branch pipe, so that the temperature of the ammonia distillation wastewater reaches a preset temperature;
and conveying the ammonia distillation wastewater reaching the preset temperature after heat exchange through the heat exchange tubes back to the ammonia distillation tower through a second branch pipe for rectifying by the ammonia distillation tower to obtain ammonia gas.
According to the scheme provided by the embodiment of the invention, the ammonia distillation wastewater is heated through the heat exchange tubes in the ascending tubes of the coke oven in the system, and a tube furnace is not required to provide gas resources or a reboiler is not required to provide steam resources, so that the cost of obtaining ammonia gas by rectifying ammonia water in the ammonia distillation tower can be reduced. And, because the tube furnace and the reboiler are cancelled, equipment purchase and maintenance cost of the tube furnace and the reboiler 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 ammonia distillation wastewater has fast flow velocity, small area and less heat required in the ascending pipe, the temperature of the raw gas in the ascending pipe is reduced, and the pipeline can not be blocked by the adhesion of viscous liquid such as tar and the like.
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 the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a coke oven in a system for utilizing waste heat of raw coke oven gas of the coke oven provided by the embodiment of the 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 for ammonia distillation wastewater 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 pipe of ammonia distillation waste water outlet;
9-flange.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The existing process for obtaining ammonia gas by heating ammonia distillation wastewater at the bottom of an ammonia distillation tower by adopting a tubular furnace or a reboiler and then conveying the ammonia distillation wastewater back to the bottom of the ammonia distillation tower for rectification has extremely high energy consumption. Although the tubular furnace or the reboiler is improved by various means in recent years, the substantial problem of high energy consumption in the heating process of the ammonia distillation wastewater is still not 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.
Aiming at the above-mentioned requirement of high energy consumption for heating ammonia distillation wastewater in the process of obtaining ammonia gas by rectifying ammonia distillation in an ammonia distillation tower on the one hand and the waste of a large amount of energy for cooling coke oven crude gas on the other hand, in order to solve the problem of how to reduce the consumption of gas or steam in the heating process of ammonia distillation wastewater so as to reduce the cost for obtaining ammonia gas by rectifying residual ammonia water in the ammonia distillation tower, the embodiment of the invention provides a system and a method for utilizing the waste heat of the coke oven crude gas.
Firstly, the system for utilizing the waste heat of the raw gas of the coke oven provided by the embodiment of the invention is introduced below.
The embodiment of the invention provides a system for utilizing waste heat of raw gas of a coke oven, which comprises a coke oven and an ammonia still;
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 the first branch tube, and the outlet end of the heat exchange tube is connected with the second branch tube; the first branch pipe and the second branch pipe are respectively connected with the ammonia still and used for enabling ammonia still wastewater at the bottom of the ammonia still to be conveyed into the heat exchange pipe from the first branch pipe for heating and then to be output back to the bottom of the ammonia still through the second branch pipe;
the first branch pipe is provided with a flow meter for monitoring the flow of the ammonia evaporation wastewater at the inlet of the heat exchange pipe and an adjusting valve for adjusting the flow of the ammonia evaporation wastewater 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 ammonia distillation wastewater 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, the ammonia distillation wastewater conveyed from the bottom of the ammonia distillation tower flows inside the heat exchange pipe, and the high-temperature coke oven raw coke oven gas and the ammonia distillation wastewater in the heat exchange pipe perform reverse heat exchange in the ascending pipe, so that the temperature difference between the high-temperature coke oven gas and the ammonia distillation wastewater is large, the heat transfer coefficient is large, and a good heat transfer effect can be achieved.
It can be understood that the flow of the ammonia distillation wastewater entering the heat exchange tube for heat exchange is adjusted according to the temperature of the ammonia distillation wastewater after heat exchange, and the purpose of stabilizing the temperature of the ammonia distillation wastewater within a certain preset temperature range can be achieved. Specifically, if the temperature of the ammonia distillation wastewater measured by the temperature measuring meter on the second branch pipe is lower than the preset temperature required by the ammonia distillation tower for obtaining concentrated ammonia gas by rectification, the regulating valve can be controlled according to the flow displayed by the flow meter, so that the ammonia distillation wastewater stays in the heat exchange pipe for a longer time, more heat is obtained, and the temperature of the ammonia distillation wastewater is increased to the preset temperature; on the contrary, if the temperature of the ammonia distillation wastewater measured by the temperature measuring meter is higher than the preset temperature required by the ammonia distillation tower for obtaining the concentrated ammonia gas through rectification, the regulating valve can be controlled according to the flow displayed by the flow meter, the retention time of the ammonia distillation wastewater in the heat exchange tube is reduced, the heat obtained by the ammonia distillation wastewater is reduced, and the temperature of the ammonia distillation wastewater is reduced to the preset temperature. Therefore, the temperature of the ammonia distillation wastewater 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, the pressure and the corrosivity of the ammonia evaporation wastewater, the flow meter can adopt any flow meter which can adapt to the working temperature, the pressure and the corrosivity of the ammonia evaporation wastewater, and the temperature measuring meter can adopt any temperature measuring meter which can meet the working temperature, the pressure and the corrosivity of the ammonia evaporation wastewater.
In addition, in the embodiment of the invention, the ammonia distillation wastewater is conveyed from the crude benzene distillation device to the heat exchange tube of the ascending tube of the coke oven through the pipeline for heat exchange and then returns to the bottom of the ammonia distillation tower, the heat exchange process is a closed circuit, horizontal resistance loss along the way is eliminated, no high-direction resistance loss exists, and the altitude difference potential energy of the coke oven is fully utilized.
According to the scheme provided by the embodiment of the invention, the ammonia distillation wastewater is heated through the heat exchange tubes in the ascending tubes of the coke oven in the system, and a tube furnace is not required to provide gas resources or a reboiler is not required to provide steam resources, so that the cost of obtaining ammonia gas by rectifying ammonia water in the ammonia distillation tower can be reduced. And, because the tube furnace and the reboiler are cancelled, equipment purchase and maintenance cost of the tube furnace and the reboiler 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 ammonia distillation wastewater has fast flow velocity, small area and less heat required in the ascending pipe, the temperature of the raw gas in the ascending pipe is reduced, and the pipeline can not be blocked by the adhesion of viscous liquid such as tar and the like.
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 ammonia distillation wastewater inlet main trunk pipe; the ammonia distillation wastewater inlet main pipe is connected with the ammonia distillation tower;
second branch pipes connected with the outlet ends of the plurality of heat exchange pipes are connected to the same ammonia distillation wastewater outlet main pipe; and the main pipe of the ammonia distillation wastewater outlet is connected with the ammonia distillation tower.
It can be understood that the heat exchange tubes are arranged on the ascending tubes of each carbonization chamber, and the ammonia distillation wastewater in the heat exchange tubes corresponding to the ascending tubes of the carbonization chambers is collected into the main tube for conveying, so that the waste heat of the raw coke oven gas can be better utilized.
Optionally, in order to prolong the service life of the heat exchange tube, the first branch tube, the second branch tube, the ammonia distillation wastewater inlet main tube and the ammonia distillation wastewater outlet main tube, ensure the reliable operation of equipment and reduce the probability of equipment accidents, the heat exchange tube, the first branch tube, the second branch tube, the ammonia distillation wastewater inlet main tube and the ammonia distillation wastewater outlet main tube are all made of high-temperature-resistant and ammonia distillation wastewater 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, in order to facilitate the extraction of the heat exchange tube from the riser and the maintenance and replacement of the heat exchange tube, the heat exchange tube is a tube array, a spiral coil or a sleeve. 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.
Based on the coke oven crude gas waste heat utilization system, the embodiment of the invention also provides a coke oven crude gas waste heat utilization method, and the embodiment of the invention also provides a coke oven crude gas waste heat utilization method which comprises the following steps:
firstly, conveying ammonia distillation wastewater at the bottom of an ammonia distillation tower to a heat exchange pipe in an ascending pipe body for heating through a first branch pipe connected with the ammonia distillation tower;
secondly, regulating the flow of the ammonia distillation wastewater at the outlet of the heat exchange tube by controlling a regulating valve on the first branch tube based on the temperature data measured by a temperature meter on the second branch tube and the flow data measured by a flow meter on the first branch tube, so that the temperature of the ammonia distillation wastewater reaches a preset temperature;
it can be understood that the flow of the ammonia distillation wastewater entering the heat exchange tube for heat exchange is adjusted according to the temperature of the ammonia distillation wastewater after heat exchange, and the purpose of stabilizing the temperature of the ammonia distillation wastewater within a certain preset temperature range can be achieved.
Specifically, under the condition that the temperature of the ammonia distillation wastewater measured by the temperature measuring meter on the second branch pipe is lower than the preset temperature required by the ammonia distillation tower for rectifying to obtain the concentrated ammonia gas, the regulating valve can be controlled according to the flow displayed by the flow meter, so that the ammonia distillation wastewater stays in the heat exchange pipe for a longer time, more heat is obtained, and the temperature of the ammonia distillation wastewater is increased to the preset temperature; on the contrary, under the condition that the temperature of the ammonia distillation wastewater measured by the temperature measuring meter is higher than the preset temperature required by the ammonia distillation tower for rectifying to obtain the concentrated ammonia gas, the regulating valve can be controlled according to the flow displayed by the flow meter, so that the retention time of the ammonia distillation wastewater in the heat exchange tube is reduced, the heat obtained by the ammonia distillation wastewater is reduced, and the temperature of the ammonia distillation wastewater is reduced to the preset temperature. Therefore, the temperature of the ammonia distillation wastewater can reach the required preset temperature through the temperature measuring meter, the flow meter and the regulating valve.
And step three, conveying the ammonia distillation wastewater reaching the preset temperature after heat exchange through the heat exchange tubes back to the ammonia distillation tower through a second branch pipe, and rectifying the ammonia distillation wastewater by using the ammonia distillation tower to obtain ammonia gas.
According to the scheme provided by the embodiment of the invention, the ammonia distillation wastewater is heated through the heat exchange tubes in the ascending tubes of the coke oven in the system, and a tube furnace is not required to provide gas resources or a reboiler is not required to provide steam resources, so that the cost of obtaining ammonia gas by rectifying ammonia water in the ammonia distillation tower can be reduced. And, because the tube furnace and the reboiler are cancelled, equipment purchase and maintenance cost of the tube furnace and the reboiler 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 scheme of the invention, the specific structure of the coke oven crude gas waste heat utilization system provided by the embodiment of the invention is exemplarily described below with reference to fig. 1 and fig. 2.
The waste heat utilization system of the raw gas of the coke oven comprises the coke oven and an ammonia still. 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 ascension pipe 2 of the coke oven comprises an ascension pipe body 21 and a heat exchange pipe 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 ascending pipe body 21 is provided with a first through hole and a second through hole; the inlet end of the heat exchange tube 22 extends out of the ascending tube body 21 through the first through hole and is connected with the first branch tube 6 through the flange 9; the outlet end of the heat exchange tube 22 extends out of the ascending tube body 21 through the second through hole and is connected with the second branch tube 7 through the flange 9. The first branch pipe 6 is connected to an ammonia distillation wastewater inlet main pipe 5, and the ammonia distillation wastewater inlet main pipe 5 is connected with an ammonia distillation tower; the second branch pipe 7 is connected to an ammonia distillation wastewater outlet main pipe 8, and the ammonia distillation wastewater outlet main pipe 8 is connected with an ammonia distillation tower. The first branch pipe 6 is connected with an ammonia still (not shown in the figure) through an ammonia still wastewater inlet main pipe 5, and the second branch pipe 7 is connected with the ammonia still through an ammonia still wastewater outlet main pipe 8, so that ammonia still wastewater at the bottom of the ammonia still enters the heat exchange pipe 22 from the first branch pipe 6 to be heated, and then is output back to the bottom of the ammonia still through the second branch pipe 7 to be rectified by the ammonia still to obtain ammonia gas. In fig. 1, the first branch pipe 6 and the second branch pipe 7 are shown by lines, and the ammonia still wastewater inlet main pipe 5 and the ammonia still wastewater outlet main pipe 8 are shown by circles, for better distinction of the ammonia still wastewater inlet main pipe 5, the first branch pipe 6, the second branch pipe 7, and the ammonia still wastewater outlet main pipe 8.
The first branch pipe 6 is provided with a flow meter 61 for monitoring the flow of the ammonia evaporation wastewater at the inlet of the heat exchange pipe 22, an adjusting valve 62 for adjusting the flow of the ammonia evaporation wastewater 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 temperature of the ammonia distillation wastewater at the outlet of the heat exchange pipe 22 and a second cut-off valve 72 for controlling the opening and closing of the outlet of the heat exchange pipe 22.
According to the system provided by the embodiment of the invention, ammonia distillation wastewater at the bottom of the ammonia distillation tower can be conveyed to the heat exchange tube 22 in the ascending tube body 21 of the system for heating through the first branch tube 6 connected with the ammonia distillation tower. It can be understood that in order to realize smooth transportation of the ammonia distillation wastewater, a pump can be arranged at the bottom of the ammonia distillation tower to pressurize the ammonia distillation wastewater.
The ammonia distillation wastewater at the bottom of the ammonia distillation tower is conveyed to a heat exchange pipe 22 in the ascending pipe body 21 for heating through a first branch pipe 6 connected with the ammonia distillation tower.
Based on the temperature data measured by the temperature 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 flow of the ammonia distillation wastewater at the outlet of the heat exchange pipe 22 is adjusted by controlling the adjusting valve 62 on the first branch pipe 6, so that the temperature of the ammonia distillation wastewater reaches the preset temperature; the preset temperature is the temperature required by ammonia distillation wastewater in the process of rectifying the concentrated ammonia gas in the ammonia distillation tower, and can be specifically determined according to actual conditions.
The ammonia distillation wastewater reaching the preset temperature after heat exchange through the heat exchange tube 22 is conveyed back to the ammonia distillation tower through the second branch tube 7 and is used for rectifying in the ammonia distillation tower to obtain ammonia gas.
According to the scheme provided by the embodiment of the invention, the ammonia distillation wastewater is heated through the heat exchange tubes in the ascending tubes of the coke oven in the system, and a tube furnace is not required to provide gas resources or a reboiler is not required to provide steam resources, so that the cost of obtaining ammonia gas by rectifying ammonia water in the ammonia distillation tower can be reduced. And, because the tube furnace and the reboiler are cancelled, equipment purchase and maintenance cost of the tube furnace and the reboiler 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 ammonia distillation wastewater has fast flow velocity, small area and less heat required in the ascending pipe, the temperature of the raw gas in the ascending pipe is reduced, and the pipeline can not be blocked by the adhesion of viscous liquid such as tar and the like.
The above description is only for the 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 (9)
1. A coke oven crude gas waste heat utilization system is characterized by comprising a coke oven and an ammonia still;
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 tube (22) is connected with a first branch tube (6), and the outlet end of the heat exchange tube (22) is connected with a second branch tube (7); the first branch pipe (6) and the second branch pipe (7) are respectively connected with the ammonia still and used for enabling ammonia still wastewater at the bottom of the ammonia still to be input into the heat exchange pipe (22) from the first branch pipe (6) for heating and then to be output back to the bottom of the ammonia still through the second branch pipe (7);
the first branch pipe (6) is provided with a flow meter (61) for monitoring the flow of ammonia evaporation wastewater at the inlet of the heat exchange pipe (22) and a regulating valve (62) for regulating the flow of ammonia evaporation wastewater 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 the ammonia distillation wastewater 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 to the same ammonia distillation wastewater inlet main pipe (5); the ammonia distillation wastewater inlet main pipe (5) is connected with the ammonia distillation tower;
second branch pipes (7) connected with the outlet ends of the plurality of heat exchange pipes (22) are connected to the same ammonia distillation wastewater outlet main pipe (8); and the ammonia distillation wastewater outlet main pipe (8) is connected with the ammonia distillation 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 ammonia distilled wastewater inlet main pipe (5) and the ammonia distilled wastewater outlet main pipe (8) are all made of high temperature resistant and ammonia distilled wastewater 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. System according to claim 6, characterized in that said first and second through holes are provided in the riser body (21) at the riser pipe (2) cover;
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).
9. The method for utilizing the waste heat of the raw coke oven gas applied to the system for utilizing the waste heat of the raw coke oven gas of the coke oven of any one of claims 1 to 8 is characterized by comprising the following steps of:
the ammonia distillation wastewater at the bottom of the ammonia distillation tower is conveyed to a heat exchange pipe (22) in an ascending pipe body (21) for heating through a first branch pipe (6) connected with the ammonia distillation tower;
based on temperature data measured by a temperature meter (71) on a second branch pipe (7) and flow data measured by a flow meter (61) on the first branch pipe (6), regulating the flow of ammonia distillation wastewater at the outlet of the heat exchange pipe (22) by controlling a regulating valve (62) on the first branch pipe (6) so as to enable the temperature of the ammonia distillation wastewater to reach a preset temperature;
and the ammonia distillation wastewater reaching the preset temperature after heat exchange through the heat exchange tube (22) is conveyed back to the ammonia distillation tower through a second branch tube (7) and is used for rectifying the ammonia distillation tower to obtain ammonia gas.
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| CN202010460089.5A CN111518573A (en) | 2020-05-27 | 2020-05-27 | Coke oven crude gas waste heat utilization system and method |
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| CN202010460089.5A CN111518573A (en) | 2020-05-27 | 2020-05-27 | Coke oven crude gas waste heat utilization system and method |
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