CN108745208A - The energy saver and method of dissolved solid urea in a kind of Melamine Production - Google Patents
The energy saver and method of dissolved solid urea in a kind of Melamine Production Download PDFInfo
- Publication number
- CN108745208A CN108745208A CN201810421661.XA CN201810421661A CN108745208A CN 108745208 A CN108745208 A CN 108745208A CN 201810421661 A CN201810421661 A CN 201810421661A CN 108745208 A CN108745208 A CN 108745208A
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- Prior art keywords
- urea
- liquid
- tower reactor
- melting tank
- urine
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000004202 carbamide Substances 0.000 title claims abstract description 107
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 106
- 239000007787 solid Substances 0.000 title claims abstract description 36
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 229920000877 Melamine resin Polymers 0.000 title claims abstract description 25
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims description 31
- 239000007788 liquid Substances 0.000 claims abstract description 89
- 210000002700 urine Anatomy 0.000 claims abstract description 36
- 238000002844 melting Methods 0.000 claims abstract description 33
- 230000008018 melting Effects 0.000 claims abstract description 33
- 238000005201 scrubbing Methods 0.000 claims abstract description 30
- 238000005516 engineering process Methods 0.000 claims abstract description 18
- 238000001816 cooling Methods 0.000 claims description 14
- 230000002485 urinary effect Effects 0.000 claims description 10
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 239000011229 interlayer Substances 0.000 claims description 5
- 239000000498 cooling water Substances 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 2
- 239000007921 spray Substances 0.000 claims 2
- 230000004927 fusion Effects 0.000 abstract description 2
- 235000013877 carbamide Nutrition 0.000 description 81
- 239000007789 gas Substances 0.000 description 21
- 150000003672 ureas Chemical class 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 3
- OHJMTUPIZMNBFR-UHFFFAOYSA-N biuret Chemical compound NC(=O)NC(N)=O OHJMTUPIZMNBFR-UHFFFAOYSA-N 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- XZMCDFZZKTWFGF-UHFFFAOYSA-N Cyanamide Chemical compound NC#N XZMCDFZZKTWFGF-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000019628 coolness Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012946 outsourcing Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000005829 trimerization reaction Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J6/00—Heat treatments such as Calcining; Fusing ; Pyrolysis
- B01J6/005—Fusing
Landscapes
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention belongs to solid urea fusion apparatus technical fields, propose a kind of energy saver of dissolved solid urea in Melamine Production, scrubbing tower is urinated including urea melting tank and liquid, it is provided with a middle part end socket in liquid urine scrubbing tower, it is located on the end socket of middle part in liquid urine scrubbing tower and is provided with middle part tower reactor, liquid urine scrubbing tower bottom end is provided with bottom tower reactor, its top is provided with liquid urine nozzle and high-temperature technology gas entrance, bottom tower reactor is connect with urea melting tank, it is also urinated circulating pump by liquid and is connected to liquid urine nozzle, the side of middle part tower reactor is connected to by gas-liquid separator with bottom tower reactor, it is provided with a fusing urea on the end socket of middle part and draws pipeline, middle part tower reactor is drawn pipeline by fusing urea and is connected to urea melting tank, a large amount of steam can be consumed by solving dissolved solid urea, the technical issues of improving production cost.
Description
Technical field
The invention belongs to solid urea fusion apparatus technical field, it is related to dissolved solid urea in a kind of Melamine Production
Energy saver and method.
Background technology
For the one-step method preparation technology of melamine of no mating urea plant, the solid urea of outsourcing is dissolved
Liquid area at molten is essential link.
Its common practice is：The low-pressure steam of 0.35-0.4Mpa, solid are passed through in the equipment tube side of " urea molten tank "
Urea is put into the shell side of " urea molten tank ", and the heat of steam, which is transmitted to by heat exchanger tube in solid urea, melts it
Solution, the fusing urea after melting collect in the bottom of " urea molten tank ", and melamine is transported to using potential difference or with pump
In the liquid urinary system of device, dissolved solid urea can consume a large amount of steam with this method, improve production cost.
Invention content
The present invention proposes the energy saver and method of dissolved solid urea in a kind of Melamine Production, solves above-mentioned
Technical problem.
The technical proposal of the invention is realized in this way：
The energy saver of dissolved solid urea in a kind of Melamine Production, including：
Urea melting tank and liquid urinate scrubbing tower, and a middle part end socket, the liquid urine washing are provided in the liquid urine scrubbing tower
It is located in tower on the middle part end socket and is provided with middle part tower reactor, liquid urine scrubbing tower bottom end is provided with bottom tower reactor, top
It is provided with liquid urine nozzle and high-temperature technology gas entrance, the bottom tower reactor connect with the urea melting tank, also urinated by liquid
Circulating pump is connected to liquid urine nozzle, and the side of the middle part tower reactor is connected to by gas-liquid separator with the bottom tower reactor,
Be provided on the middle part end socket fusing urea draw pipeline, the middle part tower reactor by the fusing urea draw pipeline with
The urea melting tank connection.
Further, it is provided with multilayer cooling tube bundle in the middle part tower reactor, recirculated cooling water is connected in the cooling tube bundle.
Further, the fusing urea draws and is disposed with flowmeter and regulating valve on pipeline.
Further, it is molten with the urea higher than it to draw one end that pipeline is connect with the middle part end socket for the fusing urea
Melt tank connected one end.
Further, the bottom tower reactor is connected to by liquid urinary catheter road with the urea melting tank, and liquid urinary catheter road tilts
Setting, and the one end being connect with the bottom tower reactor is downward, the liquid urinary catheter is provided with flowmeter and regulating valve on road.
Further, the urea melting tank includes Inner tanks, outer tank and the interlayer being disposed there between, in the interlayer
It is connected with heat preservation steam, agitating device is provided in the Inner tanks, top is provided with solid urea entrance.
The power-economizing method of dissolved solid urea, includes the following steps in a kind of Melamine Production：
S1, high-temperature technology exhaust gas is passed through into liquid urine scrubbing tower by high-temperature technology gas entrance, while nozzle is urinated by liquid
High-temperature liquid urine is also sprayed into wherein, after so that liquid urine and high-temperature technology gas is sufficiently mixed, the process gas after cooling carries a small amount of liquid urine secretly
Into gas-liquid separation is carried out in gas-liquid separator, the liquid urine after heating is fallen into the middle part tower reactor on the end socket of middle part；
High-temperature liquid urine in S2, middle part tower reactor is entered by fusing urea extraction pipeline in urea melting tank will be therein solid
Body urea is melted；
Liquid urine after being melted in S3, urea melting tank is delivered in the tower reactor of bottom, and the liquid urine part in the tower reactor of bottom conveys
It is urinated in nozzle to liquid, remaining part is delivered in other reactors for producing melamine.
Compared with prior art, it operation principle of the present invention and has the beneficial effect that：
In the present invention, the big calorimetric released in cooling procedure using the hot process gases doped with a small amount of melamine
Amount, realizes the melting of solid urea, maintains the material balance of entire liquid urinary system, saves mass energy, and reduce life
Cost is produced, dissolved solid urea in one-step method Melamine Production is made no longer to need steam (only needing a small amount of heat preservation steam),
The device of the invention and the steam consumption of method consumption are only the 5% of conventional method, and the energy is greatly saved.
Description of the drawings
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 1 is schematic structural view of the invention；
In figure：1- urea melting tanks, 2- liquid urine scrubbing tower, 3- liquid urine circulating pump, 4- cooling tube bundles, 5- gas-liquid separators,
The bottoms 6- tower reactor, the middle parts 7- tower reactor, 8- flowmeters, 9- liquid urinate nozzle, the middle parts 10- end socket, and 11- fusing ureas draw pipeline, 12-
Regulating valve, 13- high-temperature technology gas entrances, 14- liquid urinary catheters road, 15- Inner tanks, 16- outer tanks, 17- interlayers, 18- solid urea entrances,
19- agitating devices.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without creative efforts
Embodiment shall fall within the protection scope of the present invention.
As shown in Figure 1, the present invention proposes the energy saver and method of dissolved solid urea in a kind of Melamine Production.
For one-step method preparation technology of melamine, the effect of " liquid urinates scrubbing tower 2 " is will to come from finished product paved set system
Unite, be entrained with a small amount of melamine powder 210 DEG C of high-temperature technology air coolings, purification be production technology need 140 DEG C it is pure
Process gas.
In process gas cooling procedure, there will be amount of heat to release.
By " liquid urinates circulating pump 3 ", by " liquid urinates scrubbing tower 2 " bottom tower reactor 6, interior, temperature is 133-134 DEG C of fusing urea
It is delivered to the top liquid urine nozzle 9 of " liquid urinates scrubbing tower 2 ", the fusing urea of cycle enters with from " liquid urinates scrubbing tower 2 " top
High-temperature technology gas is sufficiently mixed, the heat with the mixed fusing urea of high-temperature technology gas due to absorbing process gas, temperature
It will be increased to moment 155 DEG C (temperature measuring point is located between liquid urine nozzle 9 and " liquid urinates scrubbing tower 2 " cooling tube bundle).
If fusing urea maintains 155 DEG C for a long time, there is a large amount of biuret (C2H5N3O2) generate, due to contracting two
The fusing point of urea is 185-190 DEG C, considerably beyond 132.7 DEG C of urea fusing point, when the ratio of biuret is more than a certain amount of, it will make
At pipeline, system jams.Therefore it to be cooled down rapidly with the mixed fusing urea of high-temperature technology gas.
Liquid urinates nozzle 9 in the following, being provided with multilayer cooling tube bundle in " liquid urinate scrubbing tower 2 " middle and upper part, in cooling tube bundle tube side
Be connected with recirculated cooling water, from tower top cocurrent and under 155 DEG C of process gas and cycle fusing urea by multilayer cooling tube bundle with
After recirculated cooling water heat exchange, partial heat is taken away from process gas and cycle fusing urea first, makes process gas and fusing urea
Temperature be reduced to 137 DEG C first, the temperature be higher than solid urea 132.7 DEG C of fusing point, therefore can be used in " liquid urinate scrubbing tower
The fusing ureas that recycle in 2 " melt solid urea.
In one middle part end socket 10 of " liquid urinates scrubbing tower 2 " middle part setting, during middle part end socket 10 is formed with " liquid urinates scrubbing tower 2 "
Portion's tower reactor 7 draws the fusing urea entrance that pipeline 11 draws 137 DEG C of a part from the bottom of middle part end socket 10 by fusing urea
In " urea melting tank 1 ", fusing urea draws pipeline 11 and is equipped with flowmeter 8 and regulating valve 12, adjusts valve opening, ensures molten
Melting the certain flow value of urea, (this is the solid that can be melted completely for the heat of its offer in addition " urea melting tank 1 "
Urea), due to the throttling action of regulating valve 12, the fusing urea between regulating valve 12 and " liquid urinates scrubbing tower 2 " draws pipeline 11
It is inside filled with fusing urea always, ensure that the process gas in " liquid urinates scrubbing tower 2 " will not be leaked with the fusing urea of extraction
Environment is polluted in " urea melting tank 1 ".
" urea melting tank 1 " apparatus casing outer wall is equipped with steam insulation chuck, is internally provided with blender, draws from fusing urea
Go out pipeline 11 and enter the fusing urea in " urea melting tank 1 " and the solid urea in addition " urea melting tank 1 ", in blender
Under the action of be sufficiently mixed and quickly melt, final fusing urea temperature is 132.7 DEG C in " urea melting tank 1 ", passes through position
Difference is transported to pump in the bottom tower reactor 6 of " liquid urinates scrubbing tower 2 ".
It goes in " urea melting tank 1 " and melts in addition to the 137 DEG C of fusing ureas of a part drawn from " liquid urinates scrubbing tower 2 " middle part
It solving outside solid urea, 137 DEG C of fusing ureas of another part take gas-liquid separator 5 to by process gas from " liquid urinates scrubbing tower 2 " middle part,
137 DEG C of the fusing urea after the separation of gas-liquid separator 5 enters the bottom tower reactor 6 of " liquid urinate scrubbing tower 2 " by potential difference, with from
In " urea melting tank 1 " after 132.7 DEG C of fusing urea mixing, the temperature of fusing urea is 133-134 DEG C in bottom tower reactor 6,
These fusing ureas urinate nozzle 9, process above behaviour by the top liquid that liquid urinates 3 continuous conveying of circulating pump to " liquid urinates scrubbing tower 2 "
It is carried out continuously as process.
Fusing urea is delivered in reactor with branch line on liquid urine 3 outlet line of circulating pump and is used for generating trimerization
Cyanamide.The fusing urea weight that reactor is actually gone to from this branch line is urinated with the solid being added in " urea melting tank 1 "
Plain weight is equal, this maintains the material balance of entire liquid urinary system.
In addition, obtaining 137 DEG C of pure process gas from 5 gas vent of gas-liquid separator, these pure process gas will be gone to
Other systems of melamine plant.
By above technical scheme, dissolved solid urea no longer needs steam (only to need in one-step method Melamine Production
A small amount of heat preservation steam), mass energy is saved, production cost is reduced.
By taking 60,000 tons/year of melamine plants as an example, energy-output ratio is as shown in table 1：
1 energy consumption data of table
The device of the invention and the steam consumption of method consumption are only conventional method it can be seen from 1 data of table
5%, the energy is greatly saved.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
With within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention god.
Claims (7)
1. the energy saver of dissolved solid urea in a kind of Melamine Production, which is characterized in that including urea melting tank (1) and
Liquid urinates scrubbing tower (2), and a middle part end socket (10) is provided in the liquid urine scrubbing tower (2), is located in the liquid urine scrubbing tower (2)
Middle part tower reactor (7) is provided on the middle part end socket (10), liquid urine scrubbing tower (2) bottom end is provided with bottom tower reactor (6),
Top is provided with liquid urine nozzle (9) and high-temperature technology gas entrance (13), the bottom tower reactor (6) and the urea melting tank (1)
Connection is also urinated circulating pump (3) by liquid and is connected to liquid urine nozzle (9), and the side of the middle part tower reactor (7) passes through gas-liquid
Separator (5) is connected to the bottom tower reactor (6), and a fusing urea is provided on the middle part end socket (10) and draws pipeline
(11), the middle part tower reactor (7) is drawn pipeline (11) by the fusing urea and is connected to the urea melting tank (1).
2. the energy saver of dissolved solid urea in a kind of Melamine Production according to claim 1, which is characterized in that
It is provided with multilayer cooling tube bundle (4) in the middle part tower reactor (7), recirculated cooling water is connected in the cooling tube bundle (4).
3. the energy saver of dissolved solid urea in a kind of Melamine Production according to claim 1, which is characterized in that
The fusing urea draws and is disposed with flowmeter (8) and regulating valve (12) on pipeline (11).
4. the energy saver of dissolved solid urea in a kind of Melamine Production according to claim 1, which is characterized in that
The fusing urea draws one end that pipeline (11) is connect with the middle part end socket (10) and is higher than itself and the urea melting tank (1)
One end of connection.
5. the energy saver of dissolved solid urea in a kind of Melamine Production according to claim 1, which is characterized in that
The bottom tower reactor (6) is connected to by liquid urinary catheter road (14) with the urea melting tank (1), and liquid urinary catheter road (14) inclination is set
It sets, and the one end being connect with the bottom tower reactor (6) is downward, flowmeter (8) is provided on liquid urinary catheter road (14) and adjusts
Valve (12).
6. the energy saver of dissolved solid urea in a kind of Melamine Production according to claim 1, which is characterized in that
The urea melting tank (1) includes Inner tanks (15), outer tank (16) and the interlayer (17) being disposed there between, the interlayer
(17) it is connected with heat preservation steam in, agitating device (19) is provided in the Inner tanks (15), top is provided with solid urea entrance
(18)。
7. the power-economizing method of dissolved solid urea in a kind of Melamine Production, which is characterized in that include the following steps：
S1, high-temperature technology exhaust gas is passed through into liquid urine scrubbing tower (2) by high-temperature technology gas entrance (13), while passes through liquid and urinates spray
Head (9) also sprays into high-temperature liquid urine wherein, and after so that liquid urine and high-temperature technology gas is sufficiently mixed, the process gas entrainment after cooling is a small amount of
Liquid urine, which enters, carries out gas-liquid separation in gas-liquid separator (5), the liquid urine after heating falls into the middle part tower reactor on middle part end socket (10)
(7) in；
High-temperature liquid urine in S2, middle part tower reactor (7) is drawn pipeline (11) by fusing urea and is entered it in urea melting tank (1)
In solid urea melted；
Liquid urine in S3, urea melting tank (1) after melting is delivered in bottom tower reactor (6), and the liquid in bottom tower reactor (6) urinates part
It is delivered in liquid urine nozzle (9), remaining part is delivered in other reactors for producing melamine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810421661.XA CN108745208A (en) | 2018-05-04 | 2018-05-04 | The energy saver and method of dissolved solid urea in a kind of Melamine Production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810421661.XA CN108745208A (en) | 2018-05-04 | 2018-05-04 | The energy saver and method of dissolved solid urea in a kind of Melamine Production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108745208A true CN108745208A (en) | 2018-11-06 |
Family
ID=64009298
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810421661.XA Pending CN108745208A (en) | 2018-05-04 | 2018-05-04 | The energy saver and method of dissolved solid urea in a kind of Melamine Production |
Country Status (1)
| Country | Link |
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| CN (1) | CN108745208A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113375133A (en) * | 2021-06-23 | 2021-09-10 | 四川金象赛瑞化工股份有限公司 | High-grade steam production device utilizing melamine production system and method for producing high-grade steam by utilizing high-grade steam production device |
| CN114452897A (en) * | 2022-01-06 | 2022-05-10 | 四川金象赛瑞化工股份有限公司 | Urea feeding device, urea feeding method, melamine production device and melamine production method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ATA203998A (en) * | 1998-12-03 | 2003-11-15 | Agrolinz Melamin Gmbh | METHOD FOR THE PRODUCTION OF UREA INCLUDING THE MELAMINE OFFGASES IN A UREA PLANT |
| CN1493565A (en) * | 2003-09-17 | 2004-05-05 | 丁泽华 | Trimeric cyanamide joint production method using one step method |
| CN201598246U (en) * | 2009-11-02 | 2010-10-06 | 聊城市鲁西化工工程设计有限责任公司 | Melamine and urea co-production heat energy recycling device |
| CN102219754A (en) * | 2011-04-28 | 2011-10-19 | 四川金圣赛瑞化工有限责任公司 | Energy-saving and resource-saving system and process for producing melamine by using gas-phase quenching process |
| CN202063848U (en) * | 2011-05-06 | 2011-12-07 | 安徽帝元生物科技有限公司 | Production device for urea controlled release fertilizer |
| CN102410518A (en) * | 2011-09-24 | 2012-04-11 | 安徽金禾实业股份有限公司 | Low-grade heat energy recycling method for liquid urea washing tower |
| CN104926570A (en) * | 2015-02-10 | 2015-09-23 | 四川美丰化工股份有限公司 | Method of producing urea with high stability |
| CN105218470A (en) * | 2015-08-22 | 2016-01-06 | 安徽金禾实业股份有限公司 | Solid and gas tripping device in a kind of Melamine Production |
| CN105903410A (en) * | 2016-06-12 | 2016-08-31 | 山东省舜天化工集团有限公司 | Method for urea melting in melamine production |
| CN106194282A (en) * | 2016-08-30 | 2016-12-07 | 安徽金禾实业股份有限公司 | A kind of melamine aminuria washes tower Steam Recovery electricity-generating method |
| CN106390879A (en) * | 2016-07-13 | 2017-02-15 | 北京华福工程有限公司 | A first-stage to second-stage shift converter |
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2018
- 2018-05-04 CN CN201810421661.XA patent/CN108745208A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ATA203998A (en) * | 1998-12-03 | 2003-11-15 | Agrolinz Melamin Gmbh | METHOD FOR THE PRODUCTION OF UREA INCLUDING THE MELAMINE OFFGASES IN A UREA PLANT |
| CN1493565A (en) * | 2003-09-17 | 2004-05-05 | 丁泽华 | Trimeric cyanamide joint production method using one step method |
| CN201598246U (en) * | 2009-11-02 | 2010-10-06 | 聊城市鲁西化工工程设计有限责任公司 | Melamine and urea co-production heat energy recycling device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113375133A (en) * | 2021-06-23 | 2021-09-10 | 四川金象赛瑞化工股份有限公司 | High-grade steam production device utilizing melamine production system and method for producing high-grade steam by utilizing high-grade steam production device |
| CN114452897A (en) * | 2022-01-06 | 2022-05-10 | 四川金象赛瑞化工股份有限公司 | Urea feeding device, urea feeding method, melamine production device and melamine production method |
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