CN208378758U - A kind of melamine heat reclaiming system - Google Patents
A kind of melamine heat reclaiming system Download PDFInfo
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- CN208378758U CN208378758U CN201820464033.5U CN201820464033U CN208378758U CN 208378758 U CN208378758 U CN 208378758U CN 201820464033 U CN201820464033 U CN 201820464033U CN 208378758 U CN208378758 U CN 208378758U
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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
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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
- Y02P20/50—Improvements relating to the production of bulk chemicals
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Abstract
The utility model belongs to chemical technology field, specifically discloses a kind of melamine heat reclaiming system.The melamine heat reclaiming system includes reaction system and carrier gas system；The reaction system includes liquid urine pump, urea washes tower, fluidized-bed reactor, thermal energy recoverer, hot-air filter, crystallizer and the trap being sequentially connected；The carrier gas system includes sack cleaner, Carrier Gas Compressor, carrier gas preheater and the fused salt circulatory system.Melamine heat reclaiming system provided by the utility model increases thermal energy recoverer and sack cleaner on the basis of original legacy system, process gas after sack cleaner can be directly entered Carrier Gas Compressor pressurization, it exchanges heat subsequently into thermal energy recoverer with generation gas is reacted, eliminate the raw cooling system in original road, thermal energy has effectively been recycled, the coal consumption of molten salt furnace or the consumption of natural gas are considerably reduced.
Description
Technical field
The utility model relates to chemical technology fields, and in particular, to a kind of melamine heat reclaiming system.
Background technique
Currently, melamine is usually produced by raw material of urea, production method can be divided into low-pressure process and two kinds of high-pressure process.
High-pressure process preparation technology of melamine belongs to liquid phase reactor, no catalyst.Reaction pressure is generally 7~20MPa, instead
Answering temperature is 360~400 DEG C.
Low-pressure process preparation technology of melamine belongs to gas phase catalytic reaction, is generally urged with aluminium oxide, Alusil or silica gel
Agent.Reaction pressure is generally 0.1~0.7MPa, and reaction temperature is 350~400 DEG C.
Low-pressure process preparation technology of melamine generally uses gas phase quenching technique to post-process reaction product, i.e., with ammonia
Gaseous mixture with carbon dioxide is the crystallization and purification that quenching medium completes product.
Gas phase quenching technique is gas phase catalytic reaction, and in fluidized-bed reactor, following reaction occurs:
6CO(NH2)2(urea) → C3N6H6(melamine)+6NH3+3CO2
The reaction is the endothermic reaction, and heat is provided by salt melting system, and molten salt furnace can be coal furnace or gas furnace.
The heat that molten salt furnace provides is divided into two parts: first is that urea decomposition generation melamine is absorbed in fluidized-bed reactor
Heat；Second is that heat required for carrier gas is heated to 390 DEG C.
In existing gas phase quenching technique, Carrier Gas Compressor is located at after cold air demister, inlet temperature be 135~
140 DEG C, after Carrier Gas Compressor pressurizes, outlet temperature is 190~200 DEG C, is heated subsequently into carrier gas preheater with fused salt
To 390 DEG C, fluidized-bed reactor is entered back into.The heat that carrier gas heating needs is about the 50% of molten salt furnace total heat duties, reaction life
It is lower at gas heat utilization rate, cause fluidized carrier gas heating that molten salt furnace is needed to provide a large amount of heat source.
For the defect of thermal energy recovery technology in gas phase quenching technique, some scientific research institutions and manufacturer are proposed carrier gas
Compressor is placed in after trap, and inlet temperature is 210~220 DEG C, and after Carrier Gas Compressor pressurizes, outlet temperature is
270~280 DEG C.But since in existing gas phase quenching technique, trap is all made of cyclone separating structure form, separative efficiency
Generally 99% or so.Contain a small amount of melamine powder from the process gas that trap comes out, if being directly entered carrier gas pressure
It will cause blockings for contracting machine, so that Carrier Gas Compressor is unable to operate normally.
In addition, in existing gas phase quenching technique, in addition to carrier gas (ammonia and two from the generation gas that fluidized-bed reactor exports
Carbonoxide), outside melamine, also contain by-product (sweet primary amine and melem) and a small amount of catalyst fines.In order to remove by-product
Object and catalyst fines, 390 DEG C of reaction generation gas need to first pass through hot gas cooler and are cooled to 340 DEG C, make by-product (honey primary
Amine and melem) being sublimated by gas phase becomes solid, and hot-air filter filtering is entered back into, is removed by-product (sweet primary amine and melem)
And a small amount of catalyst fines, enter back into crystallizer crystallization.And existing hot gas cooler uses tubular heat exchanger pattern, walks work in pipe
Skill gas, the raw liquid cooling heat transferring in the road Guan Waiwei.The raw liquid in road is heated gasification, becomes angry, road anger inlet channel raw food condenser is cold
Coagulating, which becomes liquid, flows back to hot gas cooler, forms Natural Circulation by potential difference.Since the raw liquid in road is biphenyl and biphenyl ether mixture, belong to
Inflammable and explosive chemicals will result in environmental pollution, or even blast accident occurs once leaking.
Summary of the invention
The purpose of this utility model is to overcome reacting in the prior art, generation gas heat utilization rate is lower, causes to fluidize
Carrier gas heating needs molten salt furnace to provide the defect of a large amount of heat sources, provides a kind of melamine heat reclaiming system, the utility model
Thermal energy recoverer and sack cleaner are increased on the basis of original legacy system, the process gas after sack cleaner can
It is directly entered Carrier Gas Compressor pressurization, exchanges heat subsequently into thermal energy recoverer with generation gas is reacted, eliminates original road raw food
But system has effectively recycled thermal energy, considerably reduces the coal consumption of molten salt furnace or the consumption of natural gas.
To achieve the goals above, the utility model is achieved by following scheme:
A kind of melamine heat reclaiming system, including reaction system and carrier gas system；The reaction system includes successively
Connected liquid urine pump 16, urea washes tower 12, fluidized-bed reactor 1, thermal energy recoverer 7, hot-air filter 9,10 and of crystallizer
Trap 11, and the cold air demister 14 being connected with urea washes tower 12；Urea washes tower 12 is equipped with air cooler 13；
The carrier gas system includes sack cleaner 18, Carrier Gas Compressor 2, carrier gas preheater 5 and the fused salt circulatory system；It catches
Storage 11, sack cleaner 18, Carrier Gas Compressor 2 and thermal energy recoverer 7 are sequentially connected；Carrier gas preheater 5 and fluidized-bed reaction
Device 1 is connected；The fused salt circulatory system includes sequentially connected fused salt storage tank 4, pump for liquid salts 3, molten salt furnace 6 and fused salt heating tube
17, fused salt heating tube 17 is located in fluidized-bed reactor 1, and fused salt heating tube 17 is connected with carrier gas preheater 5, carrier gas preheater 5
It is connected with fused salt storage tank 4.
The fluidized-bed reactor 1 includes the feed inlet set on reactor bottom, for being passed through high temperature carrier gas, discharge port position
In reactor head, the reaction for generating in output-response device generates gas, and fusing urea enters reactor by reactor middle part,
Fused salt heating tube 17 is located at reactor lower part, reacts required heat for providing.
The carrier gas preheater 5 is connected with fluidized-bed reactor 1, for heating carrier gas.
The thermal energy recoverer 7 is connected with the outlet of fluidized-bed reactor 1, generates gas for cooling reaction, while heating load
Gas.Existing hot gas cooler and road raw food condenser are replaced using thermal energy recoverer 7, eliminate raw cooling system, it is ensured that three
Poly cyanamid device is more safe and environment-friendly, efficiently runs.
The hot-air filter 9 is connected with the outlet of thermal energy recoverer 7, for filtering the by-product in reaction generation gas and urging
Agent powder.
The crystallizer 10 is connected with the outlet of hot-air filter 9, generates melamine crystallization in gas for reacting.
The trap 11 is connected with crystallizer 10, for trapping the melamine of crystallization.
The sack cleaner 18 is connected with trap 11, a small amount of trimerization for entrained in further separating technology gas
Cyanamide.
The Carrier Gas Compressor 2 is connected with sack cleaner 18, pressurizes for carrier gas.
The fused salt circulatory system is used for heated fluidized bed reactor 1 and carrier gas preheater 5, includes successively by process sequence
Fused salt storage tank 4, pump for liquid salts 3, molten salt furnace 6 and the fused salt heating tube 17 of connection, fused salt heating tube 17 are located at fluidized-bed reactor 1
Interior, fused salt heating tube 17 is connected with carrier gas preheater 5, and carrier gas preheater 5 is connected with fused salt storage tank 4；The molten salt furnace 6 can be
Coal furnace or gas furnace.
Preferably, the melamine heat reclaiming system is additionally provided with Cool gas blower 15, and Cool gas blower 15 is arranged in cold air
Between demister 14 and crystallizer 10, i.e., cold air demister 14, Cool gas blower 15 and crystallizer 10 are sequentially connected.
Preferably, the melamine heat reclaiming system is additionally provided with Cool gas blower 15, and the setting of Cool gas blower 15 is trapping
Between device 11 and urea washes tower 12, and sack cleaner 18 is between trap 11 and Cool gas blower 15, i.e. trap 11, bag
Formula deduster 18, Cool gas blower 15 and urea washes tower 12 are sequentially connected.
Preferably, the entrance of the thermal energy recoverer 7 is equipped with the carrier gas regulating valve 8 for adjusting carrier gas flux, the carrier gas
Regulating valve 8 is used to adjust the carrier gas flux by thermal energy recoverer 7, generates gas to control the reaction of the outlet of thermal energy recoverer 7
Temperature is 330~340 DEG C, so that by-product (sweet primary amine and melem) sublimates become solid completely, both ensure that melamine
The quality of product in turn avoids melamine and sublimates crystallization.
Preferably, the sack cleaner 18 includes internal rotary back-blowing device 19 and external insulation jacket 20, institute
It states sack cleaner 18 and uses rotary back-blowing technology, both improved blowback effect, and in turn ensured the long-term operation of equipment.It is described
Using 250 DEG C of nitrogen heat preservations in insulation jacket 20, with maintain process gas outlet temperature 220 DEG C or so (it is higher than inlet temperature by 1~
5 DEG C), avoid in process gas melamine crystallization of sublimating from being precipitated and Carrier Gas Compressor is caused to block.
Using the technique of above-mentioned melamine heat reclaiming system production melamine, include the following steps:
S1. the carrier gas after heating pressurization and fusing urea generate melamine through catalyst action in fluidized-bed reactor 1
Amine generates gas to get reaction；
S2. it is cooling to enter thermal energy recoverer 7 for reaction generation gas, while impurity is precipitated；
S3. the gas come out from thermal energy recoverer 7, into hot-air filter 9, filtering and impurity removing；
S4. the gas come out from hot-air filter 9, mixes with cold air into crystallizer 10, crystallizes；
S5. the gas that a large amount of melamines of entrainment come out from crystallizer 10 crystallize, separates into trap 11, separation
Melamine solid powder is exported by trap 11.
Preferably, divide two-way from the gas that trap 11 comes out, enter urea washes tower 12 all the way, heat is by air cooler 13
It takes away；The gas come out from urea washes tower 12 enters back into Cool gas blower 15 and adds into 14 Separation of Urea mist of cold air demister
Pressure, subsequently into crystallizer 10；Another way enters a small amount of melamine that sack cleaner 18 further separates entrained in gas
Amine；The gas come out from sack cleaner 18, pressurizes into Carrier Gas Compressor 2, recycles reaction life subsequently into thermal energy recoverer 7
At the heat of gas.
Preferably, the gas come out from trap 11, into entrained in sack cleaner 18 further separation gas
A small amount of melamine；The gas come out from sack cleaner 18 divides two-way, enters Carrier Gas Compressor 2 all the way and pressurizes, subsequently into
The heat that the recycling reaction of thermal energy recoverer 7 generates gas is preheated, and is heated subsequently into carrier gas preheater 5, then anti-through fluidized bed
1 bottom of device is answered to enter fluidized-bed reactor 1；Another way enters the pressurization of Cool gas blower 15, subsequently into urea washes tower 12, heat
It is taken away by air cooler 13；The gas come out from urea washes tower 12 enters back into knot into 14 Separation of Urea mist of cold air demister
Brilliant device 10.
Preferably, the carrier gas that the rotary back-blowing device 19 inside the sack cleaner 18 is exported using Carrier Gas Compressor 2
As blowback air, the dosage of ammonia is saved, operating cost is reduced.
Compared with prior art, the utility model has the following beneficial effects:
Melamine heat reclaiming system provided by the utility model increases heat on the basis of original legacy system
Melamine powder in process gas is further separated completely using sack cleaner, is kept away by energy recover and sack cleaner
Exempt to generate Crystallization Plugging, so that Carrier Gas Compressor and Cool gas blower can be directly sucked in high-temperature technology gas, thermal energy is utilized effectively.
Simultaneously as Carrier Gas Compressor outlet temperature increases substantially, carrier gas directly can generate gas and change in thermal energy recoverer with reacting
Heat not only eliminates raw cooling system, but also thermal energy is made to be fully used, and considerably reduces coal consumption or the natural gas of molten salt furnace
Consumption.There is the system of the utility model thermal energy recovery efficiency height, device to run more safe and environment-friendly effect and be obviously improved
Advantage.
Detailed description of the invention
Fig. 1 is the melamine heat reclaiming system and process flow diagram of the utility model embodiment 1.
Fig. 2 is the melamine heat reclaiming system and process flow diagram of the utility model embodiment 2.
Appended drawing reference is as follows:
1- fluidized-bed reactor 2- Carrier Gas Compressor
3- pump for liquid salts 4- fused salt storage tank
5- carrier gas preheater 6- molten salt furnace
7- thermal energy recoverer 8- carrier gas regulating valve
9- hot-air filter 10- crystallizer
11- trap 12- urea washes tower
13- air cooler 14- cold air demister
15- Cool gas blower 16- liquid urine pump
17- fused salt heating tube 18- sack cleaner
19- rotary back-blowing device 20- insulation jacket
Specific embodiment
With reference to the accompanying drawings of the specification and specific embodiment is made the utility model and is further elaborated, the reality
It applies example to be served only for explaining the utility model, is not intended to limit the scope of the utility model.Examination as used in the following examples
Proved recipe method is conventional method unless otherwise specified；Used material, reagent etc., unless otherwise specified, being can be from business way
The reagent and material that diameter obtains.
A kind of melamine heat reclaiming system of embodiment 1
A kind of melamine heat reclaiming system, as shown in Figure 1, including reaction system and carrier gas system；The reaction system
System include be sequentially connected liquid urine pump 16, urea washes tower 12, fluidized-bed reactor 1, thermal energy recoverer 7, hot-air filter 9,
Crystallizer 10 and trap 11, and the cold air demister 14 being connected with urea washes tower 12；Urea washes tower 12 is equipped with sky
Cooler 13；
The carrier gas system includes sack cleaner 18, Carrier Gas Compressor 2, carrier gas preheater 5 and the fused salt circulatory system；It catches
Storage 11, sack cleaner 18, Carrier Gas Compressor 2 and thermal energy recoverer 7 are sequentially connected；Carrier gas preheater 5 and fluidized-bed reaction
Device 1 is connected；The fused salt circulatory system includes sequentially connected fused salt storage tank 4, pump for liquid salts 3, molten salt furnace 6 and fused salt heating tube
17, fused salt heating tube 17 is located in fluidized-bed reactor 1, and fused salt heating tube 17 is connected with carrier gas preheater 5, carrier gas preheater 5
It is connected with fused salt storage tank 4.
The fluidized-bed reactor 1 includes the feed inlet set on reactor bottom, for being passed through high temperature carrier gas, discharge port position
In reactor head, the reaction for generating in output-response device generates gas, and fusing urea enters reactor by reactor middle part,
Fused salt heating tube 17 is located at reactor lower part, reacts required heat for providing.
The carrier gas preheater 5 is connected with fluidized-bed reactor 1, for heating carrier gas.
The thermal energy recoverer 7 is connected with the outlet of fluidized-bed reactor 1, generates gas for cooling reaction, while heating load
Gas.Existing hot gas cooler and road raw food condenser are replaced using thermal energy recoverer 7, eliminate raw cooling system, it is ensured that three
Poly cyanamid device is more safe and environment-friendly, efficiently runs.
The hot-air filter 9 is connected with the outlet of thermal energy recoverer 7, for filtering the by-product in reaction generation gas and urging
Agent powder.
The crystallizer 10 is connected with the outlet of hot-air filter 9, generates melamine crystallization in gas for reacting.
The trap 11 is connected with crystallizer 10, for trapping the melamine of crystallization.
The sack cleaner 18 is connected with trap 11, a small amount of trimerization for entrained in further separating technology gas
Cyanamide.
The Carrier Gas Compressor 2 is connected with sack cleaner 18, pressurizes for carrier gas.
The fused salt circulatory system is used for heated fluidized bed reactor 1 and carrier gas preheater 5, includes successively by process sequence
Fused salt storage tank 4, pump for liquid salts 3, molten salt furnace 6 and the fused salt heating tube 17 of connection, fused salt heating tube 17 are located at fluidized-bed reactor 1
Interior, fused salt heating tube 17 is connected with carrier gas preheater 5, and carrier gas preheater 5 is connected with fused salt storage tank 4；The molten salt furnace 6 can be
Coal furnace or gas furnace.
The melamine heat reclaiming system is additionally provided with Cool gas blower 15, and Cool gas blower 15 is arranged in cold air demister 14
Between crystallizer 10, i.e., cold air demister 14, Cool gas blower 15 and crystallizer 10 are sequentially connected.
The entrance of the thermal energy recoverer 7 is equipped with the carrier gas regulating valve 8 for adjusting carrier gas flux, the carrier gas regulating valve 8
For adjusting the carrier gas flux for passing through thermal energy recoverer 7, it is to control the temperature of the reaction generation gas of the outlet of thermal energy recoverer 7
330~340 DEG C, so that by-product (sweet primary amine and melem) sublimates become solid completely, it both ensure that melamine product
Quality in turn avoids melamine and sublimates crystallization.
The sack cleaner 18 includes internal rotary back-blowing device 19 and external insulation jacket 20, and the pocket type removes
Dirt device 18 uses rotary back-blowing technology, had both improved blowback effect, and had in turn ensured the long-term operation of equipment.The insulation jacket
Using 250 DEG C of nitrogen heat preservations in 20, to maintain process gas outlet temperature 220 DEG C or so (1~5 DEG C higher than inlet temperature), keep away
Exempt from melamine in process gas sublimate crystallization be precipitated and cause Carrier Gas Compressor to block.
Using the technique of above-mentioned melamine heat reclaiming system production melamine, specifically comprise the following steps:
(1) carrier gas (temperature is 270~280 DEG C) exported from Carrier Gas Compressor 2, (carries into 7 shell of thermal energy recoverer
Make leave with rage between pipe), gas is generated by the reaction in pipe and is heated to 350~360 DEG C, is heated subsequently into carrier gas preheater 5, it is pre- through carrier gas
After hot device 5 is heated to 380~400 DEG C, fluidized-bed reactor 1 is entered by the feed inlet of 1 bottom of fluidized-bed reactor, by fluidized bed
Catalyst in reactor 1 is fluidized；
(2) it is anti-that fusing urea from 16 outlet of liquid urine pump by the feed inlet at the middle part of fluidized-bed reactor 1 enters fluidized bed
Answer device 1；
(3) reaction that urea generates melamine is carried out in fluidized-bed reactor 1, maintaining reaction temperature is 350~400
DEG C, pressure between 0.1~1.0MPa (fused salt heating tube 17 is provided in fluidized-bed reactor 1, heat required for reacting by
Salt melting system provides)；
(4) reaction come out at the top of fluidized-bed reactor 1 generates gas (temperature is 380~390 DEG C) and recycles into thermal energy
Device 7 (reaction generate make leave with rage in pipe), by pipe outside carrier gas be cooled to 330~340 DEG C, by-product (sweet primary amine and honey in gas
Strangle amine) sublimating to crystallize is precipitated, and the reaction that thermal energy recoverer 7 exports generates temperature degree and is controlled by carrier gas regulating valve 8；
(5) reaction come out from thermal energy recoverer 7 generates gas and enters hot-air filter 9, is filtered to remove and carries secretly in gas
By-product (sweet primary amine and melem) and catalyst fines；
(6) the reaction generation gas come out from hot-air filter 9 enters crystallizer 10 by the top inlet of crystallizer 10, with
It is mixed from the cold air of 10 lower part of crystallizer, the melamine quenching in gas phase is sublimated crystallization；
(7) gas of a large amount of melamines of entrainment come out from 10 bottom of crystallizer enters trap 11, in trap 11
Interior separation melamine solid powder, the melamine solid powder separated are defeated by the discharging device of 11 bottom of trap
Out；
(8) gas (temperature is 210~220 DEG C) come out at the top of trap 11 divides two-way: entering urea washes all the way
Tower 12, in urea washes tower 12, heat is taken away by air cooler 13；Cold air temperature after urea washes is 130~140 DEG C,
Into 14 Separation of Urea mist of cold air demister, Cool gas blower 15 is entered back into, by under crystallizer 10 after the pressurization of Cool gas blower 15
Portion enters crystallizer 10；
Another way enters sack cleaner 18 by 18 centre inlet of sack cleaner, further separates entrained in gas
A small amount of melamine；The gas (temperature is 220 DEG C) come out from sack cleaner 18 enters Carrier Gas Compressor 2, compresses through carrier gas
After machine 2 pressurizes (temperature is 270~280 DEG C), reaction is recycled into thermal energy recoverer 7 and generates gas heat.
A kind of melamine heat reclaiming system of embodiment 2
A kind of melamine heat reclaiming system, as shown in Fig. 2, including reaction system and carrier gas system；The reaction system
System include be sequentially connected liquid urine pump 16, urea washes tower 12, fluidized-bed reactor 1, thermal energy recoverer 7, hot-air filter 9,
Crystallizer 10 and trap 11, and the cold air demister 14 being connected with urea washes tower 12；Urea washes tower 12 is equipped with sky
Cooler 13；
The carrier gas system includes sack cleaner 18, Carrier Gas Compressor 2, carrier gas preheater 5 and the fused salt circulatory system；It catches
Storage 11, sack cleaner 18, Carrier Gas Compressor 2 and thermal energy recoverer 7 are sequentially connected；Carrier gas preheater 5 and fluidized-bed reaction
Device 1 is connected；The fused salt circulatory system includes sequentially connected fused salt storage tank 4, pump for liquid salts 3, molten salt furnace 6 and fused salt heating tube
17, fused salt heating tube 17 is located in fluidized-bed reactor 1, and fused salt heating tube 17 is connected with carrier gas preheater 5, carrier gas preheater 5
It is connected with fused salt storage tank 4.
The fluidized-bed reactor 1 includes the feed inlet set on reactor bottom, for being passed through high temperature carrier gas, discharge port position
In reactor head, the reaction for generating in output-response device generates gas, and fusing urea enters reactor by reactor middle part,
Fused salt heating tube 17 is located at reactor lower part, reacts required heat for providing.
The carrier gas preheater 5 is connected with fluidized-bed reactor 1, for heating carrier gas.
The thermal energy recoverer 7 is connected with the outlet of fluidized-bed reactor 1, generates gas for cooling reaction, while heating load
Gas.Existing hot gas cooler and road raw food condenser are replaced using thermal energy recoverer 7, eliminate raw cooling system, it is ensured that three
Poly cyanamid device is more safe and environment-friendly, efficiently runs.
The hot-air filter 9 is connected with the outlet of thermal energy recoverer 7, for filtering the by-product in reaction generation gas and urging
Agent powder.
The crystallizer 10 is connected with the outlet of hot-air filter 9, generates melamine crystallization in gas for reacting.
The trap 11 is connected with crystallizer 10, for trapping the melamine of crystallization.
The sack cleaner 18 is connected with trap 11, a small amount of trimerization for entrained in further separating technology gas
Cyanamide.
The Carrier Gas Compressor 2 is connected with sack cleaner 18, pressurizes for carrier gas.
The fused salt circulatory system is used for heated fluidized bed reactor 1 and carrier gas preheater 5, includes successively by process sequence
Fused salt storage tank 4, pump for liquid salts 3, molten salt furnace 6 and the fused salt heating tube 17 of connection, fused salt heating tube 17 are located at fluidized-bed reactor 1
Interior, fused salt heating tube 17 is connected with carrier gas preheater 5, and carrier gas preheater 5 is connected with fused salt storage tank 4；The molten salt furnace 6 can be
Coal furnace or gas furnace.
The melamine heat reclaiming system is additionally provided with Cool gas blower 15, and the setting of Cool gas blower 15 is in trap 11 and urine
Between plain scrubbing tower 12, and sack cleaner 18 is between trap 11 and Cool gas blower 15, i.e. trap 11, sack cleaner
18, Cool gas blower 15 and urea washes tower 12 are sequentially connected.
The entrance of the thermal energy recoverer 7 is equipped with the carrier gas regulating valve 8 for adjusting carrier gas flux, the carrier gas regulating valve 8
For adjusting the carrier gas flux for passing through thermal energy recoverer 7, it is to control the temperature of the reaction generation gas of the outlet of thermal energy recoverer 7
330~340 DEG C, so that by-product (sweet primary amine and melem) sublimates become solid completely, it both ensure that melamine product
Quality in turn avoids melamine and sublimates crystallization.
The sack cleaner 18 includes internal rotary back-blowing device 19 and external insulation jacket 20, and the pocket type removes
Dirt device 18 uses rotary back-blowing technology, had both improved blowback effect, and had in turn ensured the long-term operation of equipment.The insulation jacket
Using 250 DEG C of nitrogen heat preservations in 20, to maintain process gas outlet temperature 220 DEG C or so (1~5 DEG C higher than inlet temperature), keep away
Exempt from melamine in process gas sublimate crystallization be precipitated and cause Carrier Gas Compressor to block.
Using the technique of above-mentioned melamine heat reclaiming system production melamine, specifically comprise the following steps:
(1) carrier gas (temperature is 270~280 DEG C) exported from Carrier Gas Compressor 2, (carries into 7 shell of thermal energy recoverer
Make leave with rage between pipe), gas is generated by the reaction in pipe and is heated to 350~360 DEG C, is heated subsequently into carrier gas preheater 5, it is pre- through carrier gas
After hot device 5 is heated to 380~400 DEG C, fluidized-bed reactor 1 is entered by the feed inlet of 1 bottom of fluidized-bed reactor, by fluidized bed
Catalyst in reactor 1 is fluidized；
(2) it is anti-that fusing urea from 16 outlet of liquid urine pump by the feed inlet at the middle part of fluidized-bed reactor 1 enters fluidized bed
Answer device 1；
(3) reaction that urea generates melamine is carried out in fluidized-bed reactor 1, maintaining reaction temperature is 350~400
DEG C, pressure between 0.1~1.0MPa (fused salt heating tube 17 is provided in fluidized-bed reactor 1, heat required for reacting by
Salt melting system provides)；
(4) reaction come out at the top of fluidized-bed reactor 1 generates gas (temperature is 380~390 DEG C) and recycles into thermal energy
Device 7 (reaction generate make leave with rage in pipe), by pipe outside carrier gas be cooled to 330~340 DEG C, by-product (sweet primary amine and honey in gas
Strangle amine) sublimating to crystallize is precipitated, and the reaction that thermal energy recoverer 7 exports generates temperature degree and is controlled by carrier gas regulating valve 8；
(5) reaction come out from thermal energy recoverer 7 generates gas and enters hot-air filter 9, is filtered to remove and carries secretly in gas
By-product (sweet primary amine and melem) and catalyst fines；
(6) the reaction generation gas come out from hot-air filter 9 enters crystallizer 10 by the top inlet of crystallizer 10, with
It is mixed from the cold air of 10 lower part of crystallizer, the melamine quenching in gas phase is sublimated crystallization；
(7) gas of a large amount of melamines of entrainment come out from 10 bottom of crystallizer enters trap 11, in trap 11
Interior separation melamine solid powder, the melamine solid powder separated are defeated by the discharging device of 11 bottom of trap
Out；
(8) gas (temperature is 210~220 DEG C) come out at the top of trap 11, by 18 centre inlet of sack cleaner
Into sack cleaner 18, a small amount of melamine of entrained in gas is further separated；
(9) gas (temperature is 220 DEG C) come out from sack cleaner 18 divides two-way: entering Carrier Gas Compressor 2, warp all the way
After Carrier Gas Compressor 2 pressurizes (temperature is 270~280 DEG C), reaction is recycled into thermal energy recoverer 7 and generates gas heat；Another way
Into Cool gas blower 15, enter urea washes tower 12 after the pressurization of Cool gas blower 15, in urea washes tower 12, heat is by air-cooled
Device 13 is taken away；Cold air temperature after urea washes is 130~140 DEG C, into 14 Separation of Urea mist of cold air demister, then into
Enter crystallizer 10.
Operation result is as shown in table 1.
The overall target ratio of 1 the utility model melamine heat reclaiming system of table and existing low-pressure process gas phase quenching system
Compared with (to produce per year in terms of 50,000 tons of melamines)
As shown in Table 1, melamine heat reclaiming system provided by the utility model, considerably reduces molten salt furnace
Thermic load, reduces coal consumption or gas consumption, and thermal energy recovery efficiency significantly improves；Simultaneously as eliminating raw cooling system
System, device run more safe and environment-friendly effect and are obviously improved.
Finally, it should be noted that above embodiments are only to illustrate the technical solution of the utility model rather than to this realities
It is gone back on the basis of above description and thinking for those of ordinary skill in the art with the limitation of novel protected range
It can make other variations or changes in different ways, there is no necessity and possibility to exhaust all the enbodiments.It is all
It is practical new to should be included in this for made any modifications, equivalent replacements, and improvements etc. within the spirit and principles of the utility model
Within type scope of protection of the claims.
Claims (5)
1. a kind of melamine heat reclaiming system, which is characterized in that including reaction system and carrier gas system；The reaction system
Including liquid urine pump (16), urea washes tower (12), fluidized-bed reactor (1), thermal energy recoverer (7), hot gas mistake being sequentially connected
Filter (9), crystallizer (10) and trap (11), and the cold air demister (14) being connected with urea washes tower (12)；Urea
Scrubbing tower (12) is equipped with air cooler (13)；
The carrier gas system includes sack cleaner (18), Carrier Gas Compressor (2), carrier gas preheater (5) and the fused salt circulatory system；
Trap (11), sack cleaner (18), Carrier Gas Compressor (2) and thermal energy recoverer (7) are sequentially connected；Carrier gas preheater (5)
It is connected with fluidized-bed reactor (1)；The fused salt circulatory system includes sequentially connected fused salt storage tank (4), pump for liquid salts (3), melts
Salt furnace (6) and fused salt heating tube (17), fused salt heating tube (17) are located in fluidized-bed reactor (1), fused salt heating tube (17) with
Carrier gas preheater (5) is connected, and carrier gas preheater (5) is connected with fused salt storage tank (4).
2. melamine heat reclaiming system according to claim 1, which is characterized in that it is additionally provided with Cool gas blower (15), it is cold
Gas blower (15) is arranged between cold air demister (14) and crystallizer (10).
3. melamine heat reclaiming system according to claim 1, which is characterized in that it is additionally provided with Cool gas blower (15), it is cold
Gas blower (15) is arranged between trap (11) and urea washes tower (12), and sack cleaner (18) in trap (11) and
Between Cool gas blower (15).
4. melamine heat reclaiming system according to claim 1, which is characterized in that the thermal energy recoverer (7) into
The carrier gas regulating valve (8) for adjusting carrier gas flux is equipped at mouthful.
5. melamine heat reclaiming system according to claim 1, which is characterized in that the sack cleaner (18) includes
The insulation jacket (20) of internal rotary back-blowing device (19) and outside.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820464033.5U CN208378758U (en) | 2018-03-30 | 2018-03-30 | A kind of melamine heat reclaiming system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820464033.5U CN208378758U (en) | 2018-03-30 | 2018-03-30 | A kind of melamine heat reclaiming system |
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| CN208378758U true CN208378758U (en) | 2019-01-15 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113624013A (en) * | 2021-08-25 | 2021-11-09 | 河南省科学院 | Material isothermal heating system for laboratory and control method thereof |
| CN115010674A (en) * | 2022-07-05 | 2022-09-06 | 山东省舜天化工集团有限公司 | Melamine production resource recycling system and recycling method |
-
2018
- 2018-03-30 CN CN201820464033.5U patent/CN208378758U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113624013A (en) * | 2021-08-25 | 2021-11-09 | 河南省科学院 | Material isothermal heating system for laboratory and control method thereof |
| CN115010674A (en) * | 2022-07-05 | 2022-09-06 | 山东省舜天化工集团有限公司 | Melamine production resource recycling system and recycling method |
| CN115010674B (en) * | 2022-07-05 | 2023-11-07 | 山东省舜天化工集团有限公司 | Melamine production resource recycling system and recycling method |
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