CN106466584A - A kind of method and device guaranteeing that tripolycyanamide fused salt is in normal condition - Google Patents
A kind of method and device guaranteeing that tripolycyanamide fused salt is in normal condition Download PDFInfo
- Publication number
- CN106466584A CN106466584A CN201610733095.7A CN201610733095A CN106466584A CN 106466584 A CN106466584 A CN 106466584A CN 201610733095 A CN201610733095 A CN 201610733095A CN 106466584 A CN106466584 A CN 106466584A
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- CN
- China
- Prior art keywords
- nitrogen
- fused salt
- tripolycyanamide
- salt groove
- groove
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Classifications
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- 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
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/14—Production of inert gas mixtures; Use of inert gases in general
-
- 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
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0006—Controlling or regulating processes
- B01J19/002—Avoiding undesirable reactions or side-effects, e.g. avoiding explosions, or improving the yield by suppressing side-reactions
-
- 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
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00049—Controlling or regulating processes
- B01J2219/00051—Controlling the temperature
Abstract
The invention discloses a kind of method and device guaranteeing that tripolycyanamide fused salt is in normal condition, the method is tripolycyanamide fused salt groove configuration protection nitrogen, and described nitrogen is derived from air separation unit or special nitrogen-making device, and in addition fused salt groove also connects bottled nitrogen.The present invention is due to being separately configured protection nitrogen, it is to avoid water, air, ammonia and/or other impurity enter in fused salt groove.And nitrogen pipeline is also equipped with standby bottled nitrogen, to ensure that salt melting system has qualified nitrogen to protect in any case, be not in problem.
Description
Technical field
The invention belongs to the Melamine Production field in Chemical Manufacture is and in particular to one kind guarantees at tripolycyanamide fused salt
Method and device in normal condition.
Background technology
In high-pressure process（7～10MPa）During Melamine Production, fused salt is that very important offer reacts institute's calorific requirement
Medium, its common composition and main character are：NaNO240%wt, NaNO37%wt, KNO353%wt, 142 DEG C of fusing point, pH
Value 7.2.Fused salt, using at 380～450 DEG C of temperature, can progressively press the Na that following reaction produces certain content2O：
5NaNO2= 3NaNO3+ Na2O + N2
If running into water, NaOH will be generated：
Na2O + H2O = 2NaOH
NaOH can cause the stress corrosion of reactor heat exchange bayonet tube, make ammonia leak into salt melting system, strong oxidoreduction occurs
Reaction, even temperature of molten salt drastically raises produces blast because generating a large amount of gases.Therefore protect and in salt melting system, do not enter water
Or other impurity is extremely important.
Content of the invention
It is an object of the invention to provide a kind of method and device guaranteeing that tripolycyanamide fused salt is in normal condition, ensure that
Salt melting system has qualified nitrogen to protect in any case.
For solving above-mentioned technical problem, the technical solution adopted in the present invention is：One kind guarantees that tripolycyanamide fused salt is in
The method of normal condition, concretely comprises the following steps：For tripolycyanamide fused salt groove configuration protection nitrogen, described nitrogen is from air separation unit
Or special nitrogen-making device, in addition fused salt groove also connect bottled nitrogen.
The dew point temperature of described nitrogen is less than -40 DEG C, and Stress control is in 0.05～0.75MPa.Fused salt controls requirement tight
Lattice control moisture.When controlling dew point temperature to be less than -40 DEG C, nitrogen moisture is less than 0.1757g/m3, meet moisture Control and require,
Simultaneously in producing control process, dew point intuitive display and water content detection, therefore formulate dew point temperature.
Also configure that phenolphthalein indicator detection means and ammonia nitrogen on-line automatic analyzer in fused salt groove.Examined by phenolphthalein indicator
Survey and in fused salt groove gas phase, whether there is ammonia；Phenolphthalein indicator variable color in the presence of ammonia, needs to investigate reason and eliminate leakage ammonia, ammonia nitrogen
The on-line automatic analyzer moment monitors the abnormal conditions that salt melting system may be mixed into ammonia.Once finding there is NH_3 leakage, it is immediately then
System stops, it is to avoid safety, equipment, technology accident.
Na in fused salt2O content is in below 0.2%wt.Meeting this index guarantees the qualified of fused salt quality.Work as Na2O is higher than should
During index, fused salt is off quality.
Na in fused salt groove2O content is periodically detected.Guarantee it within safety range.
Using described method guarantee tripolycyanamide fused salt be in normal condition device it is characterised in that：Including fused salt
Groove, fused salt groove is connected with nitrogen pipeline, and nitrogen pipeline connects air separation unit or special nitrogen-making device, and described nitrogen pipeline also connects
It is connected to bottled nitrogen.
Further, described fused salt groove is also associated with phenolphthalein indicator detection means and ammonia nitrogen on-line automatic analyzer.
The present invention passes through individually to tripolycyanamide fused salt groove configuration protection nitrogen, it is to avoid water, air, ammonia and/or other are miscellaneous
Matter enters in fused salt groove.It is separately configured and also can avoid and other equipment（As systems such as crystallization, conduction oil, ammonia heating, nitrogen compressors）
Mixed the unexpected probability leading to water and/or other impurity entrance fused salt groove.
And nitrogen pipeline is also equipped with standby bottled nitrogen, to ensure that salt melting system has qualified nitrogen in any case
Gas shielded, is not in problem.
Brief description
Fig. 1 is the tripolycyanamide salt melting system flow chart that the present invention provides.
Specific embodiment
To further illustrate the present invention with reference to embodiment, but the scope of protection of present invention is not limited to implement
The scope of example statement.
Embodiment 1
The device of a set of 10t/h high-pressure process Melamine Production, fused salt groove is independently accessed nitrogen from synthesis ammonia space division, and nitrogen reveals
- 60 DEG C of point, pressure 0.08MPa, and connect bottled nitrogen simultaneously, when space division is stopped, pressure-fired is maintained with bottled nitrogen, it is to avoid
Water and air etc. enter fused salt groove.Phenolphthalein indicator color-changing device and ammonia on-line automatic analyzer are installed on blow-down pipe, when
Carve the abnormal conditions that monitoring salt melting system may be mixed into ammonia.Every month sample analysis fused salt parameter, be in normal condition.
Embodiment 2
The device of a set of 10t/h high-pressure process Melamine Production, the special nitrogen-making device of fused salt groove configuration, -40 DEG C of nitrogen dew point,
Pressure 0.4MPa, and simultaneously connect bottled nitrogen, when nitrogen-making device stops, maintains pressure-fired with bottled nitrogen, it is to avoid water and
Air etc. enters fused salt groove.Phenolphthalein indicator color-changing device and ammonia on-line automatic analyzer are installed on blow-down pipe, the moment supervises
Control salt melting system may be mixed into the abnormal conditions of ammonia.Every month sample analysis fused salt parameter, be in normal condition.
Claims (7)
1. a kind of guarantee that tripolycyanamide fused salt is in the method for normal condition it is characterised in that concretely comprising the following steps：For tripolycyanamide
Fused salt groove configuration protection nitrogen, described nitrogen is derived from air separation unit or special nitrogen-making device, and in addition fused salt groove also connects bottle
Dress nitrogen.
2. method according to claim 1 it is characterised in that：The dew point temperature of described nitrogen is less than -40 DEG C, pressure control
System is in 0.05～0.75MPa.
3. method according to claim 1 it is characterised in that：Also configure that phenolphthalein indicator detection means and ammonia in fused salt groove
Nitrogen on-line automatic analyzer.
4. method according to claim 1 it is characterised in that：Na in fused salt2O content is in below 0.2%wt.
5. method according to claim 1 it is characterised in that：Na in fused salt groove2O content is periodically detected.
6. guarantee that tripolycyanamide fused salt is in the device of normal condition using the method described in claim 1-5 any one, its
It is characterised by：Including fused salt groove, fused salt groove is connected with nitrogen pipeline, and nitrogen pipeline connects air separation unit or special nitrogen dress processed
Put, described nitrogen pipeline is also associated with bottled nitrogen.
7. device according to claim 6 it is characterised in that：Phenolphthalein instruction is also associated with described fused salt groove blow-down pipe
Agent detection means and ammonia nitrogen on-line automatic analyzer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610733095.7A CN106466584A (en) | 2016-08-27 | 2016-08-27 | A kind of method and device guaranteeing that tripolycyanamide fused salt is in normal condition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610733095.7A CN106466584A (en) | 2016-08-27 | 2016-08-27 | A kind of method and device guaranteeing that tripolycyanamide fused salt is in normal condition |
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| Publication Number | Publication Date |
|---|---|
| CN106466584A true CN106466584A (en) | 2017-03-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610733095.7A Pending CN106466584A (en) | 2016-08-27 | 2016-08-27 | A kind of method and device guaranteeing that tripolycyanamide fused salt is in normal condition |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107199001A (en) * | 2017-05-24 | 2017-09-26 | 李鑫 | A kind of melamine reactor with leak detection function |
| CN113926406A (en) * | 2021-11-18 | 2022-01-14 | 山东省舜天化工集团有限公司 | Melamine molten salt production device containing anti-blocking valve and production method |
| CN114618380A (en) * | 2022-03-01 | 2022-06-14 | 新疆心连心能源化工有限公司 | Method and device for online cleaning carbon deposit in melamine bayonet tube reactor |
Citations (3)
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| CN1096758A (en) * | 1993-04-16 | 1994-12-28 | 普拉塞尔技术有限公司 | Container inerting |
| DE19610722A1 (en) * | 1996-03-19 | 1997-09-25 | Messer Griesheim Gmbh | Production of protective or reaction gases |
| CN204404695U (en) * | 2015-01-15 | 2015-06-17 | 西安科技大学 | A kind of laboratory sample drying protection device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1096758A (en) * | 1993-04-16 | 1994-12-28 | 普拉塞尔技术有限公司 | Container inerting |
| DE19610722A1 (en) * | 1996-03-19 | 1997-09-25 | Messer Griesheim Gmbh | Production of protective or reaction gases |
| CN204404695U (en) * | 2015-01-15 | 2015-06-17 | 西安科技大学 | A kind of laboratory sample drying protection device |
Non-Patent Citations (3)
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| 和志红等: "三聚氰胺装置反应器刺刀管泄漏现象判断及应急处理措施的探讨", 《云南化工》 * |
| 李英干等: "《湿度测量》", 30 April 1990, 气象出版社 * |
| 汪志宏等: "高压法三聚氰胺反应器安全稳定运行的影响因素", 《化工文摘》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107199001A (en) * | 2017-05-24 | 2017-09-26 | 李鑫 | A kind of melamine reactor with leak detection function |
| CN113926406A (en) * | 2021-11-18 | 2022-01-14 | 山东省舜天化工集团有限公司 | Melamine molten salt production device containing anti-blocking valve and production method |
| CN114618380A (en) * | 2022-03-01 | 2022-06-14 | 新疆心连心能源化工有限公司 | Method and device for online cleaning carbon deposit in melamine bayonet tube reactor |
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Application publication date: 20170301 |