CN112678847A - Urea coupling hydrolyzer and urea coupling hydrolysis method thereof - Google Patents
Urea coupling hydrolyzer and urea coupling hydrolysis method thereof Download PDFInfo
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- CN112678847A CN112678847A CN202011630140.9A CN202011630140A CN112678847A CN 112678847 A CN112678847 A CN 112678847A CN 202011630140 A CN202011630140 A CN 202011630140A CN 112678847 A CN112678847 A CN 112678847A
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention relates to a urea coupling hydrolyzer, comprising: the urea coupling hydrolyzer comprises a heat exchanger tube bundle horizontally arranged at the inner bottom end of a urea coupling hydrolyzer main body, an outlet pipeline vertically arranged at the tail part of the urea coupling hydrolyzer main body, a product outlet arranged at the top end of the outlet pipeline, a gas-liquid separator arranged in the outlet pipeline, a gas-liquid separation pipe vertically arranged at the lower side of the gas-liquid separator, a coupling catalyst horizontally arranged at the upper side of the gas-liquid separator and a urea solution/demineralized water inlet arranged on the upper side of the middle part of the side wall of the urea coupling hydrolyzer main body. According to the urea coupling hydrolyzer, on the premise that the pressure and the temperature are not increased, the gas-liquid separator and the coupling catalyst are additionally arranged at the product gas outlet, so that the conversion rate and the conversion efficiency of urea-to-ammonia are improved, intermediate products are reduced, energy is saved, and the operation cost is reduced for a great number of users.
Description
Technical Field
The invention relates to the technical field of SCR denitration urea ammonia production, in particular to a urea coupling hydrolyzer and a urea coupling hydrolysis method thereof.
Background
The reducing agents for SCR flue gas denitration generally comprise liquid ammonia, ammonia water and urea. Since liquid ammonia is a hazardous chemical, there are many severe limitations to its transport, storage and use. In addition, in recent years, ammonia explosion or leakage accidents are frequent, major hazard sources in a liquid ammonia tank area need to be treated, and the progress of replacing, upgrading and modifying urea is promoted.
The urea replacement upgrading and transformation technology mainly comprises two technologies, namely urea pyrolysis and urea hydrolysis, wherein the urea hydrolysis process is limited by process, pressure and temperature, intermediate products are easy to corrode and block subsequent equipment in the urea ammonia production process, and the conversion efficiency is relatively low.
Therefore, a new process is needed to solve the above problems.
Disclosure of Invention
The invention aims to provide a urea coupling hydrolyzer and a urea coupling hydrolysis method thereof aiming at the defects in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that:
the first aspect of the invention provides a urea coupling hydrolyzer, which comprises: the device comprises a heat exchanger tube bundle horizontally arranged at the inner bottom end of a urea coupling hydrolyzer main body, an outlet pipeline vertically arranged at the tail part of the urea coupling hydrolyzer main body, a product outlet arranged at the top end of the outlet pipeline, a gas-liquid separator arranged in the outlet pipeline, a gas-liquid separation pipe vertically arranged at the lower side of the gas-liquid separator, a coupling catalyst horizontally arranged at the upper side of the gas-liquid separator and a urea solution/desalted water inlet arranged on the upper part of the middle part of the side wall of the urea coupling hydrolyzer main body;
the heat exchanger tube bundle head extends to the outside of the urea coupling hydrolyzer main body, and the extension section is sealed with the urea coupling hydrolyzer main body; the upper side of the head of the heat exchanger tube bundle is provided with a steam inlet, and the lower side of the head of the heat exchanger tube bundle is provided with a steam outlet; the lower end of the gas-liquid separation pipe is inserted below the liquid level, the middle of the gas-liquid separation pipe is horizontally provided with a tangential inlet for gas to enter, and the upper end of the gas-liquid separation pipe is connected with the gas-liquid separator through a flange; the coupling catalyst is fixed on the upper side of the gas-liquid separator through a grid.
Preferably, the method further comprises the following steps: the device comprises a manhole, a plurality of sewage draining holes, a plurality of liquid level measuring holes and a plurality of temperature measuring holes;
the manhole and the liquid level measuring hole are arranged at the top end of the urea coupling hydrolyzer main body; the sewage discharge hole is formed in the middle or/and the bottom end of the side wall of the urea coupling hydrolyzer main body; the temperature measuring hole is arranged on the lower part of the middle part of the side wall of the urea coupling hydrolyzer main body.
Preferably, an inlet steam regulating valve is further arranged at the steam inlet.
Preferably, the heat exchanger tube bundle is made of 316L stainless steel, and the diameter of the tube bundle is 18-32 mm.
Preferably, the main body of the urea coupling hydrolyzer is a horizontal pressure vessel.
Preferably, the gas-liquid separator is an S-shaped blade made of 316L stainless steel, and the blade interval is 10-40 mm.
Preferably, the coupling catalyst is in a solid spherical or honeycomb shape and comprises the following components in percentage by mass:
TiO2 70～90％；
Al2O3and V2O5 10～30％。
The pipe diameter of the steam inlet can be determined by calculation according to the amount of the hydrolysis product; the diameter of the urea coupling hydrolyzer main body can be calculated and determined according to the ammonia amount required; the pipe diameter of the urea solution/desalted water inlet can be determined by calculation according to the amount of the hydrolysis product.
The second aspect of the present invention provides a urea coupling hydrolysis method using the urea coupling hydrolyzer, comprising the steps of:
s1, adding demineralized water into the urea coupling hydrolyzer main body through the urea solution/demineralized water inlet, wherein the volume of the demineralized water is at least 25% of that of the urea coupling hydrolyzer main body;
s2, dissolving dry urea into a urea solution with a mass concentration of 50%, and adding the urea solution into the urea coupling hydrolyzer main body through the urea solution/demineralized water inlet, wherein the volume of the urea solution/demineralized water inlet is at least 25% of the volume of the urea coupling hydrolyzer main body; adding desalted water and urea solution into the urea coupling hydrolyzer main body at different time intervals;
s3, introducing steam into the heat exchanger tube bundle through the steam inlet to heat, and controlling the heating temperature to be 140-;
s4, making the product gas pass through the gas-liquid separation pipe, the gas-liquid separator and the coupling catalyst in sequence to completely remove the liquid components in the product gas and catalyze the intermediate product in the product gas to generate NH3；
And S5, feeding the ammonia-containing mixed gas obtained in the step S4 after the complete water removal and conversion into a conveying pipeline from the product outlet so as to supply the ammonia-containing mixed gas to a subsequent denitration device.
By adopting the technical scheme, compared with the prior art, the invention has the following technical effects:
1) the gas-liquid separation pipe and the gas-liquid separator which are additionally arranged at the product outlet can reduce the water content in the product gas by 99 percent, thereby greatly reducing the corrosivity of the product gas and avoiding the subsequent corrosion accidents of valves, meters and the like;
2) the coupling catalyst specially arranged at the product outlet can catalyze byproducts HNCO, cyanuric acid, biuret, ammonium carbamate and the like in the product gas into NH3Thereby greatly reducing the faults of corrosion, blockage and the like of subsequent equipment;
3) the reaction conversion rate is improved, thereby reducing the operation cost.
In conclusion, the urea coupling hydrolyzer provided by the invention has higher superiority.
Drawings
FIG. 1 is a schematic structural diagram of a urea coupling hydrolyzer according to the present invention;
wherein the reference numerals include: the device comprises a steam inlet 1, a steam outlet 2, a heat exchanger tube bundle 3, a urea coupling hydrolyzer main body 4, a product outlet 5, a gas-liquid separator 6, a gas-liquid separation pipe 7, a coupling catalyst 8, a urea solution/demineralized water inlet 9, a manhole 10, a sewage discharge hole 11, a liquid level measuring hole 12 and a temperature measuring hole 13.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
Example 1
As shown in fig. 1, the present embodiment provides a urea coupling hydrolyzer, which includes: the heat exchanger tube bundle 3 is horizontally arranged at the bottom end in the urea coupling hydrolyzer main body 4, the outlet pipeline is vertically arranged at the tail part of the urea coupling hydrolyzer main body 4, the product outlet 5 is arranged at the top end of the outlet pipeline, the gas-liquid separator 6 is arranged in the outlet pipeline, the gas-liquid separation pipe 7 is vertically arranged at the lower side of the gas-liquid separator 6, the coupling catalyst 8 is horizontally arranged at the upper side of the gas-liquid separator 6, and the urea solution/desalted water inlet 9 is arranged on the upper part of the middle part of the side wall of the urea coupling hydrolyzer main body 4;
the head of the heat exchanger tube bundle 3 extends out of the urea coupling hydrolyzer main body 4, and the extension section of the heat exchanger tube bundle is sealed with the urea coupling hydrolyzer main body 4; the upper side of the head of the heat exchanger tube bundle 3 is provided with a steam inlet 1, and the lower side is provided with a steam outlet 2; the lower end of the gas-liquid separation pipe 7 is inserted below the liquid level, the middle of the gas-liquid separation pipe is horizontally provided with a tangential inlet for gas to enter, and the upper end of the gas-liquid separation pipe is connected with the gas-liquid separator 6 through a flange; the coupling catalyst 8 is fixed to the upper side of the gas-liquid separator 6 by a mesh grid.
Preferably, the method further comprises the following steps: the device comprises a manhole 10, a plurality of sewage draining holes 11, a plurality of liquid level measuring holes 12 and a plurality of temperature measuring holes 13;
the manhole 10 and the liquid level measuring hole 12 are arranged at the top end of the urea coupling hydrolyzer main body 4; the sewage discharge hole 11 is arranged in the middle or/and the bottom of the side wall of the urea coupling hydrolyzer main body 4; the temperature measuring hole is arranged at the lower part of the middle part of the side wall of the urea coupling hydrolyzer main body 4.
Preferably, an inlet steam regulating valve is further arranged at the steam inlet 1.
Preferably, the heat exchanger tube bundle 3 is made of 316L stainless steel, and the diameter of the tube bundle is 18-32 mm.
Preferably, the urea coupling hydrolyzer main body 4 is a horizontal pressure vessel.
Preferably, the gas-liquid separator 6 is an S-shaped blade made of 316L stainless steel, and the blade pitch is 10-40 mm.
Preferably, the coupling catalyst 8 is in the form of a solid sphere or a honeycomb, and comprises, by mass:
TiO2 70～90％；
Al2O3and V2O5 10～30％。
Example 2
This example provides a urea coupling hydrolysis method using the urea coupling hydrolyzer described in example 1, including the steps of:
s1, adding desalted water into the urea coupling hydrolyzer main body 4 through the urea solution/desalted water inlet 9, and reaching at least 25% of the volume of the urea coupling hydrolyzer main body 4;
s2, dissolving dry urea into a urea solution with a mass concentration of 50%, and adding the urea solution into the urea coupling hydrolyzer main body 4 through the urea solution/demineralized water inlet 9 to reach at least 25% of the volume of the urea coupling hydrolyzer main body 4;
s3, introducing steam into the heat exchanger tube bundle 3 through the steam inlet 1 for heating, and controlling the heating temperature to be 140-190 ℃ and the pressure to be 0.35-0.39MPa by the inlet steam regulating valve so as to realize the decomposition of urea;
s4, the product gas passes through the gas-liquid separation pipe 7 and the gas-liquid separator in sequence6 and the coupling catalyst 8 to completely remove the liquid component and catalyze the intermediate product to generate NH3；
And S5, feeding the ammonia-containing mixed gas obtained in the step S4 after the complete water removal and conversion into a conveying pipeline from the product outlet 5 to supply the ammonia-containing mixed gas to a subsequent denitration device.
According to the urea coupling hydrolyzer, on the premise that the pressure and the temperature are not increased, the gas-liquid separator and the coupling catalyst are additionally arranged at the product gas outlet, so that the conversion rate and the conversion efficiency of urea-to-ammonia are improved, intermediate products are reduced, energy is saved, and the operation cost is reduced for a great number of users.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (8)
1. A urea coupling hydrolyzer is characterized by comprising: the device comprises a heat exchanger tube bundle (3) horizontally arranged at the bottom end in a urea coupling hydrolyzer main body (4), an outlet pipeline vertically arranged at the tail part of the urea coupling hydrolyzer main body (4), a product outlet (5) arranged at the top end of the outlet pipeline, a gas-liquid separator (6) arranged in the outlet pipeline, a gas-liquid separation pipe (7) vertically arranged at the lower side of the gas-liquid separator (6), a coupling catalyst (8) horizontally arranged at the upper side of the gas-liquid separator (6) and a urea solution/desalted water inlet (9) arranged on the upper part of the middle part of the side wall of the urea coupling hydrolyzer main body (4);
the head of the heat exchanger tube bundle (3) extends out of the urea coupling hydrolyzer main body (4), and the extension section and the urea coupling hydrolyzer main body (4) are sealed; the upper side of the head of the heat exchanger tube bundle (3) is provided with a steam inlet (1), and the lower side is provided with a steam outlet (2); the lower end of the gas-liquid separation pipe (7) is inserted below the liquid level, the middle of the gas-liquid separation pipe is horizontally provided with a tangential inlet for gas to enter, and the upper end of the gas-liquid separation pipe is connected with the gas-liquid separator (6) through a flange; the coupling catalyst (8) is fixed on the upper side of the gas-liquid separator (6) through a grid.
2. The urea coupling hydrolyzer as claimed in claim 1, further comprising: the device comprises a manhole (10), a plurality of sewage draining holes (11), a plurality of liquid level measuring holes (12) and a plurality of temperature measuring holes (13);
the manhole (10) and the liquid level measuring hole (12) are arranged at the top end of the urea coupling hydrolyzer main body (4); the sewage discharge hole (11) is formed in the middle or/and the bottom end of the side wall of the urea coupling hydrolyzer main body (4); the temperature measuring hole is arranged on the lower part of the middle part of the side wall of the urea coupling hydrolyzer main body (4).
3. A urea coupling hydrolyser according to claim 1, wherein an inlet steam regulating valve is further provided at the steam inlet (1).
4. The urea coupling hydrolyzer as claimed in claim 1, wherein said heat exchanger bundle (3) is made of 316L stainless steel, and its bundle diameter is 18-32 mm.
5. The urea coupling hydrolyzer according to claim 1, wherein said urea coupling hydrolyzer main body (4) is a horizontal pressure vessel.
6. The urea coupling hydrolyzer as claimed in claim 1, wherein said gas-liquid separator (6) is an S-shaped blade made of 316L stainless steel, and the blade pitch is 10-40 mm.
7. A urea coupling hydrolyser according to claim 1, wherein the coupling catalyst (8) is in the form of solid spheres or honeycombs comprising, in mass percent:
TiO2 70～90％；
Al2O3and V2O5 10～30％。
8. A urea coupled hydrolysis process using a urea coupled hydrolyser according to any of the claims 1-7, characterised in that the steps comprise:
s1, adding demineralized water into the urea coupling hydrolyzer main body (4) through the urea solution/demineralized water inlet (9) and reaching at least 25% of the volume of the urea coupling hydrolyzer main body (4);
s2, dissolving dry urea into a urea solution with a mass concentration of 50%, and adding the urea solution into the urea coupling hydrolyzer main body (4) through the urea solution/demineralized water inlet (9) to reach at least 25% of the volume of the urea coupling hydrolyzer main body (4);
s3, introducing steam into the heat exchanger tube bundle (3) through the steam inlet (1) to heat, and controlling the heating temperature to be 140-190 ℃ and the pressure to be 0.35-0.39MPa by the inlet steam regulating valve to realize the decomposition of urea;
s4, the product gas sequentially passes through the gas-liquid separation pipe (7), the gas-liquid separator (6) and the coupling catalyst (8) to completely remove liquid components in the product gas and catalyze intermediate products in the product gas into NH3；
And S5, feeding the ammonia-containing mixed gas obtained in the step S4 after the complete water removal and conversion into a conveying pipeline from the product outlet (5) to supply the ammonia-containing mixed gas to a subsequent denitration device.
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Cited By (2)
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| CN114505044A (en) * | 2022-02-23 | 2022-05-17 | 西安热工研究院有限公司 | Filling type urea catalytic hydrolysis system and method |
| CN115430391A (en) * | 2022-10-13 | 2022-12-06 | 江苏峰业环境科技集团股份有限公司 | Urea catalytic hydrolysis reactor with shock mounting |
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| CN114505044A (en) * | 2022-02-23 | 2022-05-17 | 西安热工研究院有限公司 | Filling type urea catalytic hydrolysis system and method |
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| CN115430391A (en) * | 2022-10-13 | 2022-12-06 | 江苏峰业环境科技集团股份有限公司 | Urea catalytic hydrolysis reactor with shock mounting |
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