CN108151547A - Recycling waste heat of coke oven crude gas is used to take off the device and method of benzene and ammonia still process - Google Patents
Recycling waste heat of coke oven crude gas is used to take off the device and method of benzene and ammonia still process Download PDFInfo
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- CN108151547A CN108151547A CN201810094390.1A CN201810094390A CN108151547A CN 108151547 A CN108151547 A CN 108151547A CN 201810094390 A CN201810094390 A CN 201810094390A CN 108151547 A CN108151547 A CN 108151547A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
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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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- 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
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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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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- Oil, Petroleum & Natural Gas (AREA)
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- General Chemical & Material Sciences (AREA)
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- Organic Chemistry (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
The invention discloses the device and method that recycling waste heat of coke oven crude gas is used to take off benzene and ammonia still process, including rising heat exchange of heat pipe, ammonia still process reboiler, negative pressure ammonia still, de- benzene reboiler, negative pressure benzene removal tower, thermal medium slot, the oil-poor slot of heat, the thermal medium outlet for rising heat exchange of heat pipe is connect with ammonia still process reboiler, thermal medium outlet is connect with de- benzene reboiler, de- benzene reboiler is connect with thermal medium outlet, pipeline is connect with negative pressure benzene removal tower, de- benzene reboiler is connect with the oil-poor slot of heat, de- benzene reboiler is connect with thermal medium slot, ammonia still process reboiler and the oil-poor slot of heat, thermal medium slot connects, ammonia still process reboiler is connect with negative pressure ammonia still, negative pressure ammonia still is connect with ammonia still process reboiler；Negative pressure benzene removal tower is connect with the oil-poor slot of heat, and the oil-poor slot of heat is connect with the oil-poor circulating pump of heat, and the oil-poor circulating pump of heat is connect with de- benzene reboiler, rising heat exchange of heat pipe, and another way pipeline is connect with thermal medium pump discharge, and thermal medium pump is connect with thermal medium slot.
Description
Technical field
The present invention relates to coke oven coke oven uprising tube raw coke oven gas heat recovery technical field more particularly to it is a kind of use hot fluid
Recycling waste heat of coke oven crude gas is used to take off benzene and the method and apparatus of ammonia still process.
Background technology
About 700 DEG C of the mean temperature of the raw coke oven gas of coke oven coke oven uprising tube, the heat taken out of is equivalent to coking consumption of calorie
About 35 ﹪, for ease of the purification and processing of rear process, common practice is in the prior art：Spray cycle ammonium hydroxide and raw coke oven gas are straight
Contact, largely vaporizes by cyclic ammonia water, raw coke oven gas is made drastically to be cooled to 80~83 DEG C and is sent to subsequent coal gas refining system.On
The converting heat for stating process raw coke oven gas consumes a large amount of recirculated water and water at low temperature pair for useless low temperature water vapour (~82 DEG C)
Raw coke oven gas is cooled down, and is the production technology of apparent highly energy-consuming poor efficiency.
To coke oven ascending tube crude-gas heat recovery, a large amount of research has been done in home and abroad, and current technology method is
Tedge waste heat recovery generation low-pressure steam is incorporated to steam pipe network and (is directly added into water including raw coke oven gas and generates low-pressure steam and use
Conduction oil recovery waste heat passes through the various ways such as reboiler heat exchange output steam again).But steam is not all accounted for as coking
Recovery of chemical products heat medium can generate a large amount of waste water, increase difficulty and cost that Coking Plant Wastewater is administered, while low-pressure steam
Also the de- benzene regeneration technology of coking is not used to, in addition steam is an exploitation system for coke-oven plant as heat medium
System is an inefficient heat supply energy.
Invention content
Present invention aim to address problems of the existing technology, provide a kind of recycling waste heat of coke oven crude gas for taking off
Benzene and the equipment of ammonia still process；The present invention is situated between by the use of hot fluid (including hot oil-poor, fused salt etc.), the heat as the recycling of raw coke oven gas waste heat
Matter, while be also the heat medium for taking off the technical process such as benzene and ammonia still process, conveying energy is provided by circulating pump, composition takes heat
With the closed circuit circulatory system of heat supply, the present invention can substitute the tubular heater in existing de- benzene and ammonia distillation process device, be not required to
Burn the coke-stove gas with high value, also without the generation of tubular type kiln gas and the desulfuring and denitrifying apparatus of flue gas, utilizes this hair
The hot fluids recycling tedge waste heat such as bright hot oil-poor, fused salt is used to take off the technical method of benzene and ammonia still process and device can reduction
The energy consumption of recovery system is produced, avoids and reduce the discharge of pollutant, also reduces related environmentally friendly apparatus accordingly
Acquisition expenses and use cost.
The present invention also provides a kind of methods for recycling waste heat of coke oven crude gas and being used to take off benzene and ammonia still process.
The present invention solve technical problem technical solution be：
A kind of equipment for recycling waste heat of coke oven crude gas and being used to take off benzene and ammonia still process, including rising heat exchange of heat pipe, ammonia still process is boiled again
Device, negative pressure ammonia still, de- benzene reboiler, negative pressure benzene removal tower, thermal medium slot, the oil-poor slot of heat, the rising heat exchange of heat pipe include outer
The thermal medium inlet and outlet piping of side, intermediate raw coke oven gas inlet and outlet piping, the thermal medium inlet of the thermal medium inlet and outlet piping top,
Thermal medium outlet is connect in lower part, thermal medium inlet, thermal medium outlet by respective flange with external pipe respectively, thermal medium
Thermal medium is equipped in inlet and outlet piping, the raw coke oven gas inlet and outlet piping includes the raw coke oven gas import of lower part, the raw coke oven gas outlet on top,
Raw coke oven gas import is connect by flange with coke oven outlet pipe, raw coke oven gas outlet is connect by flange with bridge tube, thermal medium outlet
It is connect with ammonia still process reboiler upper inlet, while thermal medium outlet is connect by pipeline and valve one with de- benzene reboiler top,
The top exit of de- benzene reboiler is connect simultaneously by pipeline and valve two, valve four with thermal medium outlet, in valve two and valve
Pipeline between door four is connect by pipeline one with negative pressure benzene removal tower, and pipeline one is equipped with valve three, and de- benzene reboiler lower part goes out
Mouth is connect by pipeline and valve five with the oil-poor trench bottom import of heat, and valve is equipped on the pipeline of the oil-poor trench bottom import of connection heat
Door six, while de- benzene reboiler lower part outlet is connect by pipeline and valve seven with thermal medium slot import, ammonia still process reboiler lower part
Outlet connect with the oil-poor trench bottom import of heat also by pipeline and valve six, is connected simultaneously by valve seven and the import of thermal medium slot
It connects, the outlet of ammonia still process reboiler overhead vapor is connect in the middle part of negative pressure ammonia still by pipeline, negative pressure ammonia still process tower bottom wastewater outlet
It is connect by pipeline with ammonia still process reboiler bottom inlet；Negative pressure benzene removal tower lower part outlet passes through pipeline and the oil-poor slot lower inlet of heat
Connection, the poor flume outlet of heat are connect with the oil-poor pump inlet of heat, and the outlet of the oil-poor circulating pump of heat passes through pipeline all the way and valve
Eight connect with de- benzene reboiler bottom, are connect by valve nine and another way pipeline with rising the thermal medium inlet of heat exchange of heat pipe,
Another way pipeline is connect by valve ten with thermal medium pump discharge simultaneously, and thermal medium pump inlet is connected with the outlet of thermal medium slot, institute
State and heating unit be equipped in thermal medium slot, raw coke oven gas inlet and outlet flange connect with coke oven and bridge tube, thermal medium import and export flange and
External pipe connects.
Raw coke oven gas inlet and outlet flange, inner cylinder, middle cylinder, the outer barrel for rising heat exchange of heat pipe and including both ends, heat
Medium inlet and outlet flange, the thermal medium inlet and outlet flange respectively with the thermal medium inlet of thermal medium inlet and outlet piping, thermal medium
Outlet connection；Thermal medium inlet and outlet piping is formed between inner cylinder and middle cylinder, inner cylinder intracoelomic cavity is raw coke oven gas inlet and outlet piping, waste
Coal gas is imported and exported end of the flange respectively with inner cylinder, middle cylinder, outer barrel and is connect.
The inner wall of the inner cylinder is equipped with the inorganic height that smooth, radiant heat transfer and thermal stability are good, prevent tar wall built-up
Molecular coatings.
Connected between the inner cylinder and middle cylinder by intermediate heat transfer helical layer fin, middle cylinder and outer barrel it
Between be equipped with outer layer thermal resistance material.
Be equipped with deformation compensator between middle cylinder and outer barrel, the deformation compensator on cylinder to
The annular groove of outer barrel side protrusion.
The outer barrel is equipped with outer barrel wall temperature real-time monitor, and monitor is connect with controller.
The thermal medium is using hot oil-poor, fused salt or conduction oil.
The heating unit uses electric heater unit.
A kind of waste heat of coke oven crude gas that recycles is used for the method for taking off benzene and the device of ammonia still process, during negative pressure benzene removal tower starting state
The waste heat of raw coke oven gas in tedge is recycled by conduction oil or fused salt, is included the following steps：
1) Open valve one, valve three, valve four, valve seven, valve eight, valve ten close valve two, valve five, valve
Door six, valve nine；
2) thermal medium in thermal medium slot is heated to 240-260 DEG C by the electric heater unit in thermal medium slot；
3) it is sent to the thermal medium in thermal medium pumped thermal medium slot and rises heat exchange of heat pipe and 750~850 DEG C of high temperature
Raw coke oven gas exchanges heat, after heat medium temperature is increased to 260~280 DEG C；
4) de- benzene reboiler is sent to all the way, and the oil-poor heat exchange of heat come with the oil-poor slot of heat oil-poor is heated to 225~235 hot
It DEG C is sent to after negative pressure benzene removal tower provides heat for de- benzene and returns to the oil-poor slot of heat；
5) another way is sent to the distilled ammonia wastewater come at negative pressure ammonia still process reboiler heating negative pressure ammonia still bottom and generates what steam was sent back to
Negative pressure ammonia still ammonia still process；
6) after the thermal medium mixing after negative pressure benzene braising reboiler and the heat exchange of negative pressure ammonia still process reboiler out temperature 246~
260 DEG C, thermal medium slot is entered, is sent to by thermal medium pumped and is risen heat exchange of heat pipe and high temperature raw coke oven gas and exchange heat again completion one
A cycle, so moves in circles；
7) system normal operating condition
It is oil-poor as following using heat when system startup runs to the temperature of accumulation sufficient amount after 225~235 DEG C of heat are oil-poor
Ring thermal medium carries out system operation, specifically comprises the following steps：
(1) thermal medium pump out of service, closes Open valve one, valve three, valve four, valve seven, valve eight, valve
Ten, Open valve two, valve five, valve six, valve nine；
(2) temperature is oil-poor in 225~235 DEG C of heat in the oil-poor slot of the oil-poor cycle pumped heat of startup heat, is sent to tedge
Heat exchanger exchanges heat with 750~850 DEG C of high temperature raw coke oven gas, and temperature is increased to 240~250 DEG C；
(3) by high temperature raw coke oven gas heat after heat it is oil-poor be directly sent to negative pressure benzene removal tower reactor all the way, dodged under negative pressure state
The heat source for generating oil gas as negative pressure benzene removal is steamed, the oil-poor temperature of heat after flash distillation is at 230~240 DEG C, into the oil-poor slot of heat；
(4) the oil-poor another way of heat after being heated by high temperature raw coke oven gas is sent into negative pressure ammonia still process reboiler and is used for heating ammonia still process tower reactor
The waste water come generates steam and sends ammonia still back to for ammonia still process；
(5) to exit into heat after being reduced to 210~220 DEG C poor for temperature after the oil-poor heated waste water of heat in ammonia still process reboiler
Oil groove；
(6) temperature at 225~235 DEG C by the oil-poor circulating pump of heat is extracted out and is sent again after the oil-poor mixing of two-way in the oil-poor slot of heat
A cycle is completed with the heat exchange of high temperature raw coke oven gas to heat exchange of heat pipe is risen, is so moved in circles.
Beneficial effects of the present invention：
1. the present invention is by the use of thermal medium of the hot fluids such as hot oil-poor, fused salt as the recycling of raw coke oven gas waste heat is included, simultaneously
And the heat medium for taking off the technical process such as benzene and ammonia still process, conveying energy is provided by circulating pump, composition takes heat and heat supply
Closed circuit circulatory system, the present invention can substitute tubular heater in existing de- benzene and ammonia distillation process device, present invention substitution
Ammonia still process can save the heating steam that tube furnace ammonia still process is used using coal gas or steam ammonia still process, and not needing to burning has high value
Coke-stove gas may replace de- benzene tube furnace, gas saving；Also without tubular type kiln gas generate and flue gas desulfuring and denitrifying apparatus,
This conduction oil recycling tedge waste heat of the present invention is used to take off the application of the technical method and device of benzene and ammonia still process, can reduce
The energy consumption of recovery of chemical products system avoids and reduces the discharge of pollutant, also reduces related environmentally friendly apparatus accordingly
Acquisition expenses and use cost；
The method and apparatus that the present invention states can be used for negative pressure ammonia still process and negative pressure benzene removal can also be used for normal pressure and take off benzene and normal pressure
Ammonia still process；It can be individually used for ammonia still process or de- benzene；Can also be used as other technical process (such as sulphur ammonium drying, sulfur melting kettle heating etc.)
Heat supply.
After the single tedge high temperature raw coke oven gas waste heat recovery of the present invention (800-500 DEG C), it is big that heat 100,000 can be recycled
Card/hour, year recycling heat year recycling heat：10 × 24 × 365=87600, ten thousand kilocalories, conversion mark 7000kcal/ kilograms of mark of coal
Coal calculates：125 tons of mark coal/；It marks coal and presses 960 yuan/ton；Year benefit is：120000 yuan/.For 1,100,000 t/y coke
Device (2 55 hole coke ovens) can bring benefits 13,200,000 yuan every year.
2. the present invention is compared with recovered steam (temperature), recyclable high-quality waste heat (temperature)；Two media is in equipment
Adverse current completely, heat transfer temperature difference is maximum, can obtain maximum heat transfer coefficient.
3. heat transfer oil closed-circuit, no run, drip, leak；Tedge uses independent control, can independently replace and independently tie up
Shield.
4. being equipped with by the inner wall of inner cylinder, smooth, radiant heat transfer and thermal stability are good, prevent the inorganic of tar wall built-up
Polymeric coating layer composite material.Inorganic polymer coating can make equipment inner wall smooth, strengthen radiant heat transfer, and thermal stability is good,
Tar wall built-up is prevented, the thermal efficiency is high, reduces outside wall temperature.
5. it is rapid to increase heat exchange area, the intensity for improving inner cylinder, increase fluid by intermediate heat transfer helical layer fin
Intensity of flow, enhanced heat exchange improve heat exchange efficiency.
6. the outer barrel is equipped with outer barrel wall temperature real-time monitor, monitor is connect with controller.Pass through outer barrel
The external cylinder wall temperature of wall temperature real-time monitor is uninterruptedly detected, and represents that outer barrel may have the feelings of leakage when wall temperature increases
Condition occurs, and ensures the safety of equipment.
Description of the drawings
Flow chart when attached drawing 1 is system worked well；
Attached drawing 2 is the principle assumption diagram for rising heat exchange of heat pipe.
Specific embodiment
For a better understanding of the present invention, embodiments of the present invention are explained in detail below in conjunction with the accompanying drawings.
Implementation
Such as attached drawing 1, shown in Fig. 2, a kind of equipment for recycling waste heat of coke oven crude gas and being used to take off benzene and ammonia still process, including tedge
Heat exchanger 1, ammonia still process reboiler 2, negative pressure ammonia still 3, de- benzene reboiler 4, negative pressure benzene removal tower 5, thermal medium slot 6, the oil-poor slot 9 of heat,
Valve 11~20 and the pipeline 21 for forming closed cycle.
The heat exchange of heat pipe 1 that rises includes the thermal medium inlet and outlet piping 121 in outside, intermediate raw coke oven gas inlet and outlet piping 122,
The thermal medium inlet 123 of the thermal medium inlet and outlet piping 121 in top, thermal medium outlet 124 in lower part, thermal medium inlet 123,
Thermal medium outlet 124 is connect respectively by respective flange with external pipe, and thermal medium is equipped in thermal medium inlet and outlet piping 121,
The raw coke oven gas inlet and outlet piping includes the raw coke oven gas import 125 of lower part, the raw coke oven gas outlet 126 on top, and raw coke oven gas import 125 is logical
Cross that flange is connect with coke oven outlet pipe, raw coke oven gas outlet 126 is connect by flange with bridge tube, thermal medium outlet 124 and ammonia still process
2 upper inlet of reboiler connects, while thermal medium outlet 124 is connect by pipeline and valve 1 with de- 4 top of benzene reboiler,
The top exit of de- benzene reboiler 4 is connect simultaneously by pipeline and valve 2 12, valve 4 14 with thermal medium outlet 124, in valve
Pipeline between door 2 12 and valve 4 14 is connect by pipeline 1 with negative pressure benzene removal tower 5, and pipeline 1 is equipped with valve three
13, de- 4 lower part outlet of benzene reboiler is connect by pipeline and valve 5 15 with oil-poor 9 bottom inlet of slot of heat, oil-poor in connection heat
The pipeline of 9 bottom inlet of slot is equipped with valve 6 16, while de- 4 lower part outlet of benzene reboiler passes through pipeline and valve 7 17 and heat
6 import of media slot connects, and 2 lower part outlet of ammonia still process reboiler connects also by pipeline and valve 6 16 with oil-poor 9 bottom inlet of slot of heat
It connects while is connect by valve 7 17 with 6 import of thermal medium slot, in the outlet of 2 overhead vapor of ammonia still process reboiler and negative pressure ammonia still 3
Portion is connected by pipeline, and 3 bottom wastewater outlet of negative pressure ammonia still is connect by pipeline with 2 bottom inlet of ammonia still process reboiler；Negative pressure
5 lower part outlet of debenzolizing tower is connect by pipeline with oil-poor 9 lower inlet of slot of heat, the oil-poor outlet of slot 9 of heat and the oil-poor circulating pump 10 of heat
Import connects, and the outlet of the oil-poor circulating pump 10 of heat is connect with de- 4 bottom of benzene reboiler by pipeline 23 all the way and valve 8 18, is logical
It crosses valve 99 and another way pipeline 21 and is connect with rising the thermal medium inlet 123 of heat exchange of heat pipe 1, while another way pipeline 21 is logical
It crosses valve 10 to connect with 8 outlet of thermal medium pump, thermal medium pumps 8 imports and connects with the outlet of thermal medium slot 6, the thermal medium slot 6
It is interior to be equipped with heating unit 7.Raw coke oven gas inlet and outlet flange 101 is connect with coke oven and bridge tube, raw coke oven gas bottom in and top out；Thermal medium passes in and out
Mouth flange 110 is connect with external pipe, thermal medium upper entering and lower leaving, and in equipment completely countercurrently, heat transfer temperature difference is maximum for two media,
Maximum heat transfer coefficient can be obtained.
The heating unit 7 uses electric heater unit.
The thermal medium is using hot oil-poor, conduction oil or fused salt.
The raw coke oven gas inlet and outlet flange 101 for rising heat exchange of heat pipe 1 including both ends, inner cylinder 103, middle cylinder 105,
Outer barrel 108, thermal medium inlet and outlet flange 110.Described thermal medium inlet and outlet flange 110 respectively with thermal medium inlet and outlet piping
Thermal medium inlet 123, thermal medium outlet 124 connect.Thermal medium inlet and outlet piping is formed between inner cylinder 103 and middle cylinder 105
121,103 inner cavity of inner cylinder is raw coke oven gas inlet and outlet piping 122, raw coke oven gas inlet and outlet flange 101 respectively with inner cylinder 103, intermediate
The end connection of cylinder 105, outer barrel 108.
The inner wall of the inner cylinder 103 is equipped with smooth, radiant heat transfer and thermal stability are good, prevent the inorganic of tar wall built-up
Polymeric coating layer 102；Inorganic polymer coating 102 can make equipment inner wall smooth, strengthen radiant heat transfer, and thermal stability is good, prevent
Only tar wall built-up.
It is connected between the inner cylinder 103 and middle cylinder 105 by intermediate heat transfer helical layer fin 104, middle cylinder
Outer layer thermal resistance material 106 is equipped between 105 and outer barrel 108.Heat-transfer surface can be increased by intermediate heat transfer helical layer fin 104
Product, the intensity for improving inner cylinder 103, increase fluid turbulent intensity, enhanced heat exchange improve heat exchange efficiency.
Between middle cylinder 105 and outer barrel 108 be equipped with deformation compensator 107, the deformation compensator 107 be set on
Between the annular groove 111 protruded to 108 side of outer barrel on cylinder 105.
The outer barrel 108 is equipped with outer barrel wall temperature real-time monitor 109, and monitor is connect with controller.By outer
9 external cylinder wall temperature of cylinder wall temperature real-time monitor is uninterruptedly detected, and represents that outer barrel may be let out when wall temperature increases
Happening for leakage, ensures the safety of equipment.
A kind of waste heat of coke oven crude gas that recycles is used to taking off the method for benzene and ammonia still process, and when negative pressure benzene removal 5 starting state of tower passes through
The waste heat of raw coke oven gas, includes the following steps in thermal medium (conduction oil or fused salt) recycling tedge：
1) Open valve 1, valve 3 13, valve 4 14, valve 7 17, valve 8 18, valve 10 close valve
2 12, valve 5 15, valve 6 16, valve 9 19；
2) thermal medium in thermal medium slot 6 is heated to 240-260 DEG C by the electric heater unit 7 in thermal medium slot 6；
3) it is sent to the thermal medium in 8 extraction thermal medium slot 6 of thermal medium pump and rises heat exchange of heat pipe 1 and 750~850 DEG C of height
Warm raw coke oven gas heat exchange, after heat medium temperature is increased to 260~280 DEG C；
4) send to de- benzene reboiler 4 all the way, the oil-poor heat exchange of heat with the oil-poor slot 9 of heat, it is hot it is oil-poor be heated to 225~
235 DEG C are sent to negative pressure benzene removal tower and return to the oil-poor slot of heat to take off after benzene provides heat；
5) another way is sent to the distilled ammonia wastewater generation steam come at 3 bottom of the heating negative pressure of negative pressure ammonia still process reboiler 2 ammonia still and sends back to
Negative pressure ammonia still ammonia still process；
6) after the thermal medium mixing after negative pressure benzene braising reboiler 4 and negative pressure ammonia still process reboiler 2 exchange heat out temperature 240~
260 DEG C, thermal medium slot 6 is entered, is sent to by 8 extraction of thermal medium pump and is risen heat exchange of heat pipe and high temperature raw coke oven gas and exchange heat again completion
One cycle, so moves in circles；
7) system normal operating condition
It is oil-poor as following using heat when system startup runs to the temperature of accumulation sufficient amount after 225~235 DEG C of heat are oil-poor
Ring thermal medium carries out system operation, specifically comprises the following steps：
(1) thermal medium pump 8 out of service, closes Open valve 1, valve 3 13, valve 4 14, valve 7 17, valve
8 18, valve 10, Open valve 2 12, valve 5 15, valve 6 16, valve 9 19；
(2) start the oil-poor circulating pump 10 of heat and extract in the oil-poor slot 9 of heat that temperature is oil-poor in 225~235 DEG C of heat out, be sent to rising
Heat exchange of heat pipe 1 exchanges heat with 750~850 DEG C of high temperature raw coke oven gas, and temperature is increased to 240~250 DEG C；
(3) by high temperature raw coke oven gas heat after heat it is oil-poor be directly sent to negative pressure benzene removal tower reactor all the way, dodged under negative pressure state
The heat source for generating oil gas as negative pressure benzene removal is steamed, the oil-poor temperature of heat after flash distillation is at 230~240 DEG C, into the oil-poor slot of heat；
(4) the oil-poor another way of heat after being heated by high temperature raw coke oven gas is sent into negative pressure ammonia still process reboiler and is used for heating ammonia still process tower reactor
The waste water come generates steam and sends ammonia still back to for ammonia still process；
(5) to exit into heat after being reduced to 210~220 DEG C poor for temperature after the oil-poor heated waste water of heat in ammonia still process reboiler
Oil groove；
(6) temperature is extracted out again at 225~235 DEG C by the oil-poor circulating pump of heat after the oil-poor mixing of two-way in the oil-poor slot 9 of heat
It is sent to and rises heat exchange of heat pipe and high temperature raw coke oven gas heat exchange one cycle of completion, so move in circles.The present invention is returned using hot fluid
Receive coke oven high temperature raw coke oven gas waste heat and be directly used in de- benzene and ammonia still process, using tedge composite material heat exchanger, with hot fluid (including
Hot oil-poor, fused salt) as raw coke oven gas waste heat recycling thermal medium, the heating directly as technical process such as de- benzene and ammonia still processs is situated between
Matter provides conveying energy by circulating pump, forms and take heat and the closed circuit circulatory system of heat supply.The present invention can be used for negative pressure ammonia still process
Normal pressure is can also be used for negative pressure benzene removal and takes off benzene and normal pressure ammonia still process, can be individually used for ammonia still process or de- benzene, be can also be used as other works
The heat supply of skill process (such as sulphur ammonium is dry, sulfur melting kettle heating).The present invention tedge composite material heat exchanger using internal layer without
Machine polymeric coating layer can make equipment inner wall smooth, strengthen radiant heat transfer, thermal stability is good, prevents tar wall built-up；Intermediate heat transfer
Helical layer fin has the intensity for increasing heat exchange area, improving inner cylinder, increase fluid turbulent intensity, enhanced heat exchange, heat exchange effect
Rate improves；Outer barrel wall temperature real-time monitor externally cylinder wall temperature can be detected uninterruptedly, represent outer when wall temperature increases
Cylinder may have happening for leakage, ensure the safety of equipment.
Although above-mentioned be described the specific embodiment of invention with reference to attached drawing, not to the scope of the present invention
Limitation, based on the technical solutions of the present invention, those skilled in the art do not need to make the creative labor and can make
Various modifications or changes still within protection scope of the present invention.
Claims (9)
1. a kind of waste heat of coke oven crude gas that recycles is used to take off the equipment of benzene and ammonia still process, including rise heat exchange of heat pipe, ammonia still process reboiler,
Negative pressure ammonia still, de- benzene reboiler, negative pressure benzene removal tower, thermal medium slot, the oil-poor slot of heat, it is characterized in that, the rising heat exchange of heat pipe
Thermal medium inlet and outlet piping including outside, intermediate raw coke oven gas inlet and outlet piping, the thermal medium inlet of the thermal medium inlet and outlet piping
In top, thermal medium outlet in lower part, thermal medium inlet, thermal medium outlet are connected respectively by respective flange and external pipe
Connect, be equipped with thermal medium in thermal medium inlet and outlet piping, the raw coke oven gas inlet and outlet piping include the raw coke oven gas import of lower part, top famine
Gas exit, raw coke oven gas import is connect by flange with coke oven outlet pipe, raw coke oven gas outlet is connect by flange with bridge tube, heat
Media outlet is connect with ammonia still process reboiler upper inlet, while thermal medium outlet passes through on pipeline and valve one and de- benzene reboiler
Portion connects, and the top exit of de- benzene reboiler is connect simultaneously by pipeline and valve two, valve four with thermal medium outlet, in valve
Pipeline between two and valve four is connect by pipeline one with negative pressure benzene removal tower, and pipeline one is equipped with valve three, takes off benzene reboiler
Lower part outlet is connect by pipeline and valve five with the oil-poor trench bottom import of heat, on the pipeline of the oil-poor trench bottom import of connection heat
Equipped with valve six, while de- benzene reboiler lower part outlet is connect by pipeline and valve seven with thermal medium slot import, and ammonia still process is boiled again
Device lower part outlet connect also by pipeline and valve six with heat oil-poor trench bottom import, simultaneously by valve seven and thermal medium slot into
Mouth connection, the outlet of ammonia still process reboiler overhead vapor are connect in the middle part of negative pressure ammonia still by pipeline, negative pressure ammonia still process tower bottom waste water
Outlet is connect by pipeline with ammonia still process reboiler bottom inlet；Negative pressure benzene removal tower lower part outlet passes through pipeline and the oil-poor slot lower part of heat
Import connects, and the poor flume outlet of heat is connect with the oil-poor pump inlet of heat, the outlet of hot oil-poor circulating pump by pipeline all the way and
Valve eight connect with de- benzene reboiler bottom, is connected by valve nine and another way pipeline with rising the thermal medium inlet of heat exchange of heat pipe
It connecing, while another way pipeline is connect by valve ten with thermal medium pump discharge, thermal medium pump inlet is connected with the outlet of thermal medium slot,
Heating unit is equipped in the thermal medium slot, raw coke oven gas inlet and outlet flange is connect with coke oven and bridge tube, thermal medium inlet and outlet flange
It is connect with external pipe.
2. a kind of equipment for recycling waste heat of coke oven crude gas and being used to take off benzene and ammonia still process as described in claim 1, it is characterized in that, institute
It states and rises raw coke oven gas inlet and outlet flange, inner cylinder, middle cylinder, outer barrel that heat exchange of heat pipe includes both ends, thermal medium inlet and outlet
Flange, thermal medium inlet and outlet flange are connect respectively with the thermal medium inlet of thermal medium inlet and outlet piping, thermal medium outlet；It is interior
Thermal medium inlet and outlet piping is formed between cylinder and middle cylinder, inner cylinder intracoelomic cavity is raw coke oven gas inlet and outlet piping, and raw coke oven gas is imported and exported
End of the flange respectively with inner cylinder, middle cylinder, outer barrel is connect.
3. a kind of equipment for recycling waste heat of coke oven crude gas and being used to take off benzene and ammonia still process as claimed in claim 2, it is characterized in that, institute
The inner wall for stating inner cylinder is equipped with the inorganic polymer coating that smooth, radiant heat transfer and thermal stability are good, prevent tar wall built-up.
4. a kind of equipment for recycling waste heat of coke oven crude gas and being used to take off benzene and ammonia still process as claimed in claim 2, it is characterized in that, institute
It states and is connected between inner cylinder and middle cylinder by intermediate heat transfer helical layer fin, outer layer is equipped between middle cylinder and outer barrel
Thermal resistance material.
5. a kind of equipment for recycling waste heat of coke oven crude gas and being used to take off benzene and ammonia still process as claimed in claim 2, it is characterized in that,
Be equipped with deformation compensator between middle cylinder and outer barrel, the deformation compensator on cylinder to outer barrel side
The annular groove of protrusion.
6. a kind of equipment for recycling waste heat of coke oven crude gas and being used to take off benzene and ammonia still process as claimed in claim 2, it is characterized in that, institute
Outer barrel is stated equipped with outer barrel wall temperature real-time monitor, monitor is connect with controller.
7. a kind of equipment for recycling waste heat of coke oven crude gas and being used to take off benzene and ammonia still process as described in claim 1, it is characterized in that, institute
Thermal medium is stated using hot oil-poor, conduction oil or fused salt.
8. a kind of equipment for recycling waste heat of coke oven crude gas and being used to take off benzene and ammonia still process as described in claim 1, it is characterized in that, institute
Heating unit is stated using electric heater unit.
9. it is used to take off the side of benzene and the device of ammonia still process using claim 1 to 8 any one of them recycling waste heat of coke oven crude gas
Method, it is characterized in that, the waste heat of raw coke oven gas in tedge is recycled during negative pressure benzene removal tower starting state by conduction oil or fused salt, including
Following steps：
1) Open valve one, valve three, valve four, valve seven, valve eight, valve ten, close valve two, valve five, valve six,
Valve nine；
2) thermal medium in thermal medium slot is heated to 240-260 DEG C by the electric heater unit in thermal medium slot；
3) it is sent to the thermal medium in thermal medium pumped thermal medium slot and rises heat exchange of heat pipe and 750~850 DEG C of high temperature famine coal
Gas exchanges heat, after heat medium temperature is increased to 260~280 DEG C；
4) de- benzene reboiler is sent to all the way, and the oil-poor heat exchange of heat come with the oil-poor slot of heat oil-poor be heated to 225~235 DEG C and send hot
The oil-poor slot of heat is returned to after providing heat for de- benzene to negative pressure benzene removal tower；
5) another way is sent to the distilled ammonia wastewater come at negative pressure ammonia still process reboiler heating negative pressure ammonia still bottom and generates the negative pressure that steam is sent back to
Ammonia still ammonia still process；
6) negative pressure benzene braising reboiler and negative pressure ammonia still process reboiler heat exchange after out thermal medium mixing after temperature at 246~260 DEG C,
Enter thermal medium slot, by thermal medium pumped be sent to rise heat exchange of heat pipe with high temperature raw coke oven gas again exchange heat complete one follow
Ring so moves in circles；
7) system normal operating condition
The temperature for accumulating sufficient amount is run to after 225~235 DEG C of heat are oil-poor when system starts, it is oil-poor as cycling hot using heat
Medium carries out system operation, specifically comprises the following steps：
(1) thermal medium pump out of service, closes Open valve one, valve three, valve four, valve seven, valve eight, valve ten, opens
Open valve two, valve five, valve six, valve nine；
(2) temperature is oil-poor in 225~235 DEG C of heat in the oil-poor slot of the oil-poor cycle pumped heat of startup heat, is sent to tedge and exchanges heat
Device exchanges heat with 750~850 DEG C of high temperature raw coke oven gas, and temperature is increased to 240~250 DEG C；
(3) by high temperature raw coke oven gas heat after heat it is oil-poor be directly sent to negative pressure benzene removal tower reactor all the way, under negative pressure state flash production
Heat source of the oil generation gas as negative pressure benzene removal, the oil-poor temperature of heat after flash distillation is at 230~240 DEG C, into the oil-poor slot of heat；
(4) the oil-poor another way of heat after being heated by high temperature raw coke oven gas is sent into negative pressure ammonia still process reboiler and is used for heating what ammonia still process tower reactor was come
Waste water generates steam and sends ammonia still back to for ammonia still process；
(5) to exit into heat after being reduced to 210~220 DEG C oil-poor for temperature after the oil-poor heated waste water of heat in ammonia still process reboiler
Slot；
(6) temperature at 225~235 DEG C by the oil-poor circulating pump of heat is extracted out and is sent to again after the oil-poor mixing of two-way in the oil-poor slot of heat
Riser heat exchanger completes a cycle with the heat exchange of high temperature raw coke oven gas, so moves in circles.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810094390.1A CN108151547B (en) | 2018-01-31 | 2018-01-31 | Equipment and method for recycling waste heat of raw coke oven gas for benzene removal and ammonia distillation |
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| CN201810094390.1A CN108151547B (en) | 2018-01-31 | 2018-01-31 | Equipment and method for recycling waste heat of raw coke oven gas for benzene removal and ammonia distillation |
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| CN111111386A (en) * | 2020-02-25 | 2020-05-08 | 韶关凯鸿纳米材料有限公司 | Ammonia distillation and ammonia absorption dual-purpose heat exchange system and use method thereof |
| CN111217664A (en) * | 2019-07-30 | 2020-06-02 | 杨承诣 | Device for heating rich oil and distilling crude benzene by using waste heat of raw gas and producing crude benzene by negative pressure |
| CN113061442A (en) * | 2021-03-30 | 2021-07-02 | 太原理工大学 | Ascending pipe for treating wastewater by wet oxidation |
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| CN108151547B (en) | 2023-05-09 |
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Denomination of invention: Equipment and method for recovering waste heat from coke oven raw gas for benzene removal and ammonia distillation Effective date of registration: 20230703 Granted publication date: 20230509 Pledgee: Rizhao Bank Co.,Ltd. Jinan Changqing Branch Pledgor: JINAN METALLURGY CHEMICAL EQUIPMENT CO.,LTD. Registration number: Y2023980046845 |