CN111908486A - Urea hydrolysis device - Google Patents
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- CN111908486A CN111908486A CN202010965428.5A CN202010965428A CN111908486A CN 111908486 A CN111908486 A CN 111908486A CN 202010965428 A CN202010965428 A CN 202010965428A CN 111908486 A CN111908486 A CN 111908486A
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- 239000004202 carbamide Substances 0.000 title claims abstract description 58
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 57
- 230000007062 hydrolysis Effects 0.000 title claims abstract description 31
- 238000006460 hydrolysis reaction Methods 0.000 title claims abstract description 31
- 239000007788 liquid Substances 0.000 claims abstract description 43
- 238000010438 heat treatment Methods 0.000 claims abstract description 28
- 239000003054 catalyst Substances 0.000 claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000007791 liquid phase Substances 0.000 claims abstract description 21
- 239000012071 phase Substances 0.000 claims abstract description 16
- 239000002699 waste material Substances 0.000 claims abstract description 15
- 238000010926 purge Methods 0.000 claims description 63
- 230000001105 regulatory effect Effects 0.000 claims description 29
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 13
- 229920003023 plastic Polymers 0.000 claims description 5
- 239000004033 plastic Substances 0.000 claims description 5
- 238000003860 storage Methods 0.000 claims description 5
- 230000001276 controlling effect Effects 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 2
- 238000002360 preparation method Methods 0.000 abstract description 2
- 238000010992 reflux Methods 0.000 abstract description 2
- 239000000126 substance Substances 0.000 abstract description 2
- 238000011033 desalting Methods 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 15
- 238000005516 engineering process Methods 0.000 description 9
- 230000003197 catalytic effect Effects 0.000 description 6
- 238000002425 crystallisation Methods 0.000 description 5
- 230000008025 crystallization Effects 0.000 description 5
- 229910021529 ammonia Inorganic materials 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000036632 reaction speed Effects 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000009191 jumping Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/02—Preparation, purification or separation of ammonia
- C01C1/08—Preparation of ammonia from nitrogenous organic substances
- C01C1/086—Preparation of ammonia from nitrogenous organic substances from urea
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention relates to the technical field of chemical material preparation, in particular to a urea hydrolysis device, which comprises: the device comprises a hydrolyzer body, a heating coil, a urea pipeline, a heating steam pipeline, a condensate pipeline, a desalting water pipeline, a catalyst pipeline, a product gas pipeline, a gas phase pressure relief pipeline, a safety valve pressure relief pipeline, a liquid phase reflux pipeline and a waste liquid pipeline. The urea hydrolysis device can completely realize automatic control.
Description
Technical Field
The invention relates to the technical field of chemical material preparation, in particular to a urea hydrolysis device.
Background
From the history of the development of the denitration market, in the first denitration development of Japan in the 20 th century and 70 th century, a liquid ammonia system is adopted for 90 percent, in the second denitration development of Europe in the 80 th century, only 20 percent of power plants adopt liquid ammonia and other power plants adopt ammonia and urea, and after the 90 th century, almost most of power plants adopt a urea system in the U.S. denitration. There are 3 mainstream urea hydrolysis ammonia production technologies abroad, which are U2A, AOD common hydrolysis technology and SafeDeNOx catalytic hydrolysis technology.
Since U2A and AOD technology do not use catalyst, the urea hydrolysis speed is slow, the reaction temperature is 180 ℃ and 250 ℃, and a large reactor is needed to meet the supply of ammonia, the temperature and pressure of the system reaction are not constant. The technique of SafeDeNOx catalytic hydrolysis was developed by Chemithon in 2000-2001 inspired by U.S. Pat. No. 5252308. The SafeDeNOx technology uses a reproducible catalyst to greatly accelerate the reaction speed, the load tracking time can be shortened to within 1min for response, the operation temperature and pressure are reduced, and the start and stop are quick, so that the control is convenient.
The urea catalytic hydrolysis technology is researched in 3 months in 2012, and is required to greatly improve the reaction speed, reduce corrosion, reduce the volume and reduce energy consumption on the basis of the common hydrolysis technology. After the three-year principle verification, pilot test and demonstration engineering research and development, the low-energy-consumption urea catalytic hydrolysis technology is successfully put into operation in the 200MW heat supply unit of the second thermal power plant of Changchun in 2015 1 month, and through 168 test, the low-energy-consumption urea catalytic hydrolysis technology is currently applied to the main domestic power generation group.
However, although the problems of slow reaction speed, large volume, serious corrosion and the like are solved on the principle of the existing urea catalytic hydrolysis process, the process still has the defect of incomplete automation.
Disclosure of Invention
Therefore, the technical problem to be solved by the present invention is to overcome the defect that the urea hydrolysis device in the prior art cannot be fully automatically controlled, so as to provide a urea hydrolysis device which can be fully automatically controlled.
In order to solve the above technical problem, the present invention provides a urea hydrolysis apparatus, comprising:
the hydrolyzer comprises a hydrolyzer body, wherein a first thermal resistor, a second thermal resistor, a third thermal resistor, a first radar liquid level meter, a second radar liquid level meter and a third radar liquid level meter are arranged on the hydrolyzer body;
the heating coil is arranged in the hydrolyzer body;
the urea pipeline is connected with the hydrolyzer body and used for injecting urea solution into the hydrolyzer body, and a first automatic switch valve, a first automatic regulating valve, an on-site pressure gauge, a first pressure transmitter, a second pressure transmitter and a third pressure transmitter are arranged on the urea pipeline;
the heating steam pipeline is communicated with an inlet of the heating coil and is provided with a second automatic switch valve, a second automatic regulating valve, a fourth pressure transmitter and a fourth thermal resistor;
the condensate pipeline is connected with the outlet of the heating coil and is used for conveying steam after heat exchange;
the desalted water pipeline is communicated with the hydrolyzer body and used for injecting desalted water into the hydrolyzer body, and a third automatic switch valve is arranged on the desalted water pipeline;
the catalyst pipeline is communicated with the hydrolyzer body and is used for injecting a catalyst into the hydrolyzer body, and a valve is arranged on the catalyst pipeline;
the product gas pipeline is connected with the top end of the hydrolyzer body and used for conveying ammonia gas generated in the hydrolyzer body, and a third automatic regulating valve, a fifth pressure transmitter and a fifth thermal resistor are arranged on the product gas pipeline;
the gas-phase pressure relief pipeline is connected with the top end of the hydrolyzer body, and a fourth automatic switch valve is arranged on the gas-phase pressure relief pipeline;
the safety valve pressure relief pipeline is connected with the hydrolyzer body, and a safety valve and a sixth pressure transmitter are arranged on the safety valve pressure relief pipeline;
one end of the liquid phase return pipeline is connected with the hydrolyzer body, the other end of the liquid phase return pipeline is connected with the urea storage tank, and a fifth automatic switch valve is arranged on the liquid phase return pipeline;
and the waste liquid pipeline is connected with the hydrolyzer body.
The automatic steam purging device is characterized by further comprising a purging steam pipeline, the purging steam pipeline is connected with the product gas pipeline through a first branch, a first automatic steam purging switch valve is arranged on the first branch, the first branch is connected with the gas-phase pressure relief pipeline through a second branch, a second automatic steam purging switch valve is arranged on the second branch, the first branch is connected with the safety valve pressure relief pipeline through a third branch, a third automatic steam purging switch valve is arranged on the third branch, the purging steam pipeline is connected with the liquid-phase return pipeline through a fourth branch, a fourth automatic steam purging switch valve is arranged on the fourth branch, the purging steam pipeline is connected with the waste liquid pipeline through a fifth branch, and a fifth automatic steam purging switch valve is arranged on the fifth branch.
The control system is used for controlling the safety valve to be opened when the sixth pressure transmitter detects that the pressure of the hydrolyzer body exceeds 1.2 Mpa.
The root parts of the first radar liquid level meter, the second radar liquid level meter and the third radar liquid level meter are filled with high-temperature-resistant plastics, and electric tracing heat is arranged outside the root parts of the first radar liquid level meter, the second radar liquid level meter and the third radar liquid level meter.
The hydrolyzer body, the urea line, the heating steam line, the condensate line, the desalted water line, the catalyst line, the product gas line, the gas phase pressure relief line, the safety valve pressure relief line, the liquid phase return line, the purge steam line, the first automatic on-off valve, the first automatic regulating valve, the on-site pressure gauge, the first pressure transmitter, the second pressure transmitter, the third pressure transmitter, the second automatic on-off valve, the second automatic regulating valve, the fourth pressure transmitter, the third automatic on-off valve, the third automatic regulating valve, the fifth pressure transmitter, the fourth automatic on-off valve, the safety valve, the sixth pressure transmitter, the fifth automatic on-off valve, the first automatic steam purge on-off valve, The second automatic steam purging switch valve, the third automatic steam purging switch valve, the fourth automatic steam purging switch valve and the fifth automatic steam purging switch valve are all provided with electric tracing and heat insulation structures.
The technical scheme of the invention has the following advantages:
1. the urea hydrolysis device provided by the invention can completely realize automatic control.
2. The urea hydrolysis device provided by the invention also comprises a purging steam pipeline, so that the automatic cleaning control of each pipeline can be realized, and the crystallization and blockage of each pipeline can be prevented.
3. According to the urea hydrolysis device provided by the invention, the roots of the first radar liquid level meter, the second radar liquid level meter and the third radar liquid level meter are filled with high-temperature-resistant plastics, and electric tracing is arranged outside the roots of the first radar liquid level meter, the second radar liquid level meter and the third radar liquid level meter, so that data jumping caused by crystallization and blockage of the roots of the radar liquid level meters can be prevented.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of a urea hydrolysis apparatus provided in an embodiment of the present invention.
Description of reference numerals:
1-hydrolyzer body; 2-heating the steam line; 3-a condensate line; 4-a desalted water line; 5-catalyst line; 6-urea line; 7-product gas line; 8-gas phase pressure relief line; 9-relief valve relief line; 10-purge steam line; 11-liquid phase reflux line; 12-a waste line; 13-a second self-regulating valve; 14-a first self-regulating valve; 15-third self-regulating valve; 16-a first automatic steam purge on-off valve; 17-a second automatic steam purge on-off valve; 18-third automatic steam purge on-off valve; 19-a fourth automatic steam purge on-off valve; 20-a fifth automatic steam purge on-off valve; 21-a fifth automatic switch valve, 22-a first automatic switch valve; 23-a third automatic on-off valve; 24-a second automatic on-off valve; 25-a fourth automatic on-off valve; 26-a safety valve; 27-a heating coil; t1 — first thermal resistance; t2-second thermal resistance; t3-third thermal resistance; t4-fourth thermal resistance; t5-fifth thermal resistance; l1 — first radar level gauge; l2-second radar level gauge; l3-third radar level gauge; p1 — first pressure transmitter; p2 — second pressure transmitter; p3-third pressure transmitter; p4-fourth pressure transmitter; p5-fifth pressure transmitter; p6-sixth pressure transmitter; p7-in situ pressure gauge.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
This example provides specific embodiments of a urea hydrolysis apparatus, which in one embodiment, as shown in fig. 1, comprises: the device comprises a hydrolyzer body 1, a heating coil 27, a urea pipeline 6, a heating steam pipeline 2, a condensate pipeline 3, a desalted water pipeline 4, a catalyst pipeline 5, a product gas pipeline 7, a gas phase pressure relief pipeline 8, a safety valve pressure relief pipeline 9, a liquid phase return pipeline 11 and a waste liquid pipeline 12.
Wherein be equipped with first thermal resistance T1 on hydrolyzer body 1, second thermal resistance T2, third thermal resistance T3, first radar level gauge L1, second radar level gauge L2, third radar level gauge L3, in this embodiment, set up three thermal resistance and three radar level gauge on hydrolyzer body 1, can realize three and get two redundant control, especially when one of them thermal resistance or radar level gauge damage, it can accurate measurement hydrolyzer body 1 liquid level and temperature still to remain two thermal resistance and radar level gauge, and it is also not too many to set up three thermal resistance and three radar level count volume, be unlikely to the extravagant cost.
The heating coil 27 is provided in the hydrolyzer body 1 for heating the urea solution and the catalyst solution in the hydrolyzer body 1.
The urea pipeline 6 is connected with the hydrolyzer body 1 and used for injecting urea solution into the hydrolyzer body 1, a first automatic switch valve 22, a first automatic regulating valve 14, an on-site pressure gauge P7, a first pressure transmitter P1, a second pressure transmitter P2 and a third pressure transmitter P3 are arranged on the urea pipeline 6, the three pressure transmitters and the on-site pressure gauge P7 can measure the pressure of the hydrolyzer body 1, and the first automatic switch valve 22 and the first automatic regulating valve 14 can realize the automatic control of the flow of the urea solution.
Heating steam pipeline 2 communicates with heating coil 27's entry, be equipped with second automatically-controlled switch valve 24 on the heating steam pipeline 2, second automatically regulated valve 13, fourth pressure transmitter P4, fourth thermal resistance T4, set up fourth pressure transmitter P4 and fourth thermal resistance T4 real-time supervision steam pressure and temperature, second automatically-controlled switch valve 24, second automatically regulated valve 13 can realize the automatic control of steam flow.
The condensate line 3 is connected to the outlet of the heating coil 27 for delivering the heat-exchanged steam.
The demineralized water pipeline 4 is communicated with the hydrolyzer body 1 and used for injecting demineralized water into the hydrolyzer body 1, a third automatic switch valve 23 is arranged on the demineralized water pipeline 4, and the third automatic switch valve 23 can realize automatic control of the injection of the demineralized water.
The catalyst pipeline 5 is communicated with the hydrolyzer body 1 and is used for injecting a catalyst into the hydrolyzer body 1, and a valve is arranged on the catalyst pipeline 5.
The product gas pipeline 7 is connected with the top end of the hydrolyzer body 1 and used for conveying ammonia gas generated in the hydrolyzer body 1, a third automatic regulating valve 15, a fifth pressure transmitter P5 and a fifth thermal resistor T5 are arranged on the product gas pipeline 7, the fifth pressure transmitter P5 and the fifth thermal resistor T5 can monitor the pressure and the temperature of the gas, and the third automatic regulating valve 15 can regulate the flow and the pressure on the product gas pipeline 7.
The gas phase pressure relief pipeline 8 is connected with the top end of the hydrolyzer body 1, and a fourth automatic switch valve 25 is arranged on the gas phase pressure relief pipeline 8 and can automatically relieve pressure.
The safety valve pressure relief pipeline 9 is connected with the hydrolyzer body 1, the safety valve 26 and the sixth pressure transmitter P6 are arranged on the safety valve pressure relief pipeline 9, pressure can be automatically relieved for the hydrolyzer body 1, and safety of the hydrolyzer body 1 is guaranteed.
One end of the liquid phase backflow pipeline 11 is connected with the hydrolyzer body 1, the other end of the liquid phase backflow pipeline is connected with the urea storage tank, a fifth automatic switch valve 21 is arranged on the liquid phase backflow pipeline 11, and when the hydrolyzer body 1 needs to be overhauled, the fifth automatic switch valve 21 is automatically opened, so that the solution in the hydrolyzer body 1 is conveyed back to the urea storage tank through the liquid phase backflow pipeline 11.
The waste liquid pipeline 12 is connected with the hydrolyzer body 1, and when the hydrolyzer body 1 discharges sewage, the waste liquid is conveyed to a sewage discharge trench through the waste liquid pipeline 12.
The urea hydrolysis device provided by the embodiment can realize automatic control by controlling the opening of each switch valve and each regulating valve through the control system.
As shown in fig. 1, the demineralized water line 4 is connected to the urea solution line, the catalyst line 5 is connected to the demineralized water line 4, the layout is compact, the catalyst line 5, the demineralized water line 4 and the urea solution line flow through a common main line, and the on-site pressure gauge P7, the first pressure transmitter P1, the second pressure transmitter P2 and the third pressure transmitter P3 are all located on the main line, so that the pressure can be monitored while the catalyst and the demineralized water are being transported.
On the basis of the above embodiment, in a preferred embodiment, the system further includes a purging steam line 10, the purging steam line 10 is connected to the product gas line 7 through a first branch, a first automatic steam purging switch valve 16 is disposed on the first branch, the first branch is connected to the gas-phase pressure relief line 8 through a second branch, a second automatic steam purging switch valve 17 is disposed on the second branch, the first branch is connected to the safety valve pressure relief line 9 through a third branch, a third automatic steam purging switch valve 18 is disposed on the third branch, the purging steam line 10 is connected to the liquid-phase return line 11 through a fourth branch, a fourth automatic steam purging switch valve 19 is disposed on the fourth branch, the purging steam line 10 is connected to the waste liquid line 12 through a fifth branch, and a fifth automatic steam purging switch valve 20 is disposed on the fifth branch. The urea hydrolysis device provided by the embodiment can realize automatic cleaning control of each pipeline and prevent each pipeline from being blocked by crystals.
In addition to the above embodiments, in a preferred embodiment, the control system is further included, and the control system is configured to control the safety valve 26 to open when the sixth pressure transmitter P6 detects that the pressure of the hydrolyzer body 1 exceeds 1.2Mpa, so that the safety valve 26 can be automatically opened, and the safety performance of the hydrolyzer body 1 can be ensured.
In a preferred embodiment, in addition to the above-described embodiments, the roots of the first, second, and third radar level gauges L1, L2, and L3 are filled with a high-temperature-resistant plastic, and electric tracing is provided outside the roots of the first, second, and third radar level gauges L1, L2, and L3. The data jumping caused by the root crystallization blockage of the radar liquid level meter can be prevented. Specifically, the center of each radar level gauge is a pipe, an outer shell is arranged around the pipe, and high-temperature-resistant plastics are filled between the outer shell and the pipe at the root of the radar level gauge.
In addition to the above embodiments, in a preferred embodiment, the hydrolyzer body 1, the urea line 6, the heating steam line 2, the condensate line 3, the demineralized water line 4, the catalyst line 5, the product gas line 7, the gas phase pressure relief line 8, the safety valve pressure relief line 9, the liquid phase return line 11, the purge steam line 10, the first automatic opening/closing valve 22, the first automatic regulating valve 14, the on-site pressure gauge P7, the first pressure transmitter P1, the second pressure transmitter P2, the third pressure transmitter P3, the second automatic opening/closing valve 24, the second automatic regulating valve 13, the fourth pressure transmitter P4, the third automatic opening/closing valve 23, the valve, the third automatic regulating valve 15, the fifth pressure transmitter P5, the fourth automatic opening/closing valve 25, the safety valve 26, the sixth pressure transmitter P6, the fifth automatic opening/closing valve 21, the first automatic steam purge opening/closing valve 16, the third automatic opening/closing valve 15, the fifth pressure transmitter P6, the second automatic opening, The second automatic steam purging switch valve 17, the third automatic steam purging switch valve 18, the fourth automatic steam purging switch valve 19 and the fifth automatic steam purging switch valve 20 are all provided with electric tracing and heat insulation structures. Can prevent each pipeline from being blocked by crystallization.
In the operation of the urea hydrolysis apparatus provided in this embodiment, in the first step, the valve on the catalyst line 5 is opened, and the catalyst solution is injected into the hydrolyzer body 1. In the second step, the third automatic switch valve 23 on the demineralized water pipeline 4 is opened, and the demineralized water is injected into one fourth of the total liquid level of the hydrolyzer body 1. And thirdly, opening the first automatic switch valve 22 and the first automatic regulating valve 14 on the urea solution pipeline, and injecting the urea solution into the half part of the total liquid level of the hydrolyzer body 1, wherein the first automatic regulating valve 14 is used for regulating the urea flow later. Fourthly, opening a second automatic regulating valve 13 and a second automatic switch valve 24 on the heating steam pipeline 2, heating the urea solution by the steam through a heating coil 27 in the hydrolyzer body 1, wherein the second automatic regulating valve 13 is used for regulating the steam flow, a fourth pressure transmitter P4 and a fourth thermal resistor T4 on the heating steam pipeline 2 are used for monitoring steam parameters in real time, and the steam parameters are at 165-180 ℃ and 0.7-1.0 Mpa. The condensate line 3 conveys the steam after heat exchange.
An on-site pressure gauge P7 on the urea pipeline 6, a first pressure transmitter P1, a second pressure transmitter P2 and a third pressure transmitter P3 are used for monitoring the pressure of the hydrolyzer body 1, the pressure range is 0.35-0.55 Mpa, a first thermal resistor T1, a second thermal resistor T2 and a third thermal resistor T3 are used for monitoring the temperature of the hydrolyzer body 1, the temperature range is 135-150 ℃, and a first radar liquid level meter L1, a second radar liquid level meter L2 and a third radar liquid level meter L3 are used for monitoring the liquid level of the hydrolyzer body 1 and keeping the liquid level at a position which is half the diameter of the hydrolyzer.
Fifthly, the ammonia product gas generated in the hydrolyzer body 1 is conveyed through a product gas pipeline 7, a third automatic regulating valve 15 is arranged on the pipeline to regulate the product gas flow, and a fifth pressure transmitter P5 and a fifth thermal resistor T5 are arranged to monitor the pressure and the temperature in real time. When the pressure of the hydrolyzer body 1 exceeds 0.9MPa, the fourth automatic switch valve 25 is automatically opened to release the pressure of the hydrolyzer body 1; and a sixth pressure transmitter P6 is arranged at the safety valve 26 and used for detecting the pressure at the safety valve 26, and when the pressure exceeds 1.2MPa, the safety valve 26 is automatically opened to release the pressure of the hydrolyzer body 1.
Sixthly, when the hydrolyzer body 1 discharges sewage, the waste liquid is conveyed through the waste liquid pipeline 12, when the hydrolyzer needs to be overhauled, the fifth automatic switch valve 21 is opened, and the solution in the hydrolyzer body 1 is conveyed back to the urea storage tank through the liquid phase return pipeline 11.
And seventhly, when the pipelines need to be cleaned, conveying the purging steam to the pipelines through the purging steam pipeline 10 through the first automatic steam purging switch valve 16, the second automatic steam purging switch valve 17, the third automatic steam purging switch valve 18, the fourth automatic steam purging switch valve 19 and the fifth automatic steam purging switch valve 20, and respectively cleaning the product gas pipeline 7, the gas-phase pressure relief pipeline 8, the safety valve pressure relief pipeline 9, the liquid-phase return pipeline 11 and the waste liquid pipeline 12 according to specific use conditions. For example, when the hydrolyzer body 1 is used for 1 month, bottom blowdown is required, and when blowdown is completed, the fifth automatic steam purging switch valve 20 needs to be opened to perform steam purging on the waste liquid pipeline 12. Purging must be thorough to prevent liquid from remaining in the tube and prevent crystallization blockage.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (5)
1. A urea hydrolysis apparatus, comprising:
the hydrolyzer comprises a hydrolyzer body (1), wherein a first thermal resistor (T1), a second thermal resistor (T2), a third thermal resistor (T3), a first radar liquid level meter (L1), a second radar liquid level meter (L2) and a third radar liquid level meter (L3) are arranged on the hydrolyzer body (1);
a heating coil (27) arranged in the hydrolyzer body (1);
the urea pipeline (6) is connected with the hydrolyzer body (1) and is used for injecting urea solution into the hydrolyzer body (1), and a first automatic switch valve (22), a first automatic regulating valve (14), an on-site pressure gauge (P7), a first pressure transmitter (P1), a second pressure transmitter (P2) and a third pressure transmitter (P3) are arranged on the urea pipeline (6);
the heating steam pipeline (2) is communicated with an inlet of the heating coil (27), and a second automatic switch valve (24), a second automatic regulating valve (13), a fourth pressure transmitter (P4) and a fourth thermal resistor (T4) are arranged on the heating steam pipeline (2);
the condensate pipeline (3) is connected with the outlet of the heating coil (27) and is used for conveying steam after heat exchange;
the desalted water pipeline (4) is communicated with the hydrolyzer body (1) and is used for injecting desalted water into the hydrolyzer body (1), and a third automatic switch valve (23) is arranged on the desalted water pipeline (4);
the catalyst pipeline (5) is communicated with the hydrolyzer body (1) and is used for injecting a catalyst into the hydrolyzer body (1), and a valve is arranged on the catalyst pipeline (5);
the product gas pipeline (7) is connected with the top end of the hydrolyzer body (1) and is used for conveying ammonia gas generated in the hydrolyzer body (1), and a third automatic regulating valve (15), a fifth pressure transmitter (P5) and a fifth thermal resistor (T5) are arranged on the product gas pipeline (7);
the gas-phase pressure relief pipeline (8) is connected with the top end of the hydrolyzer body (1), and a fourth automatic switch valve (25) is arranged on the gas-phase pressure relief pipeline (8);
the safety valve pressure relief pipeline (9) is connected with the hydrolyzer body (1), and a safety valve (26) and a sixth pressure transmitter (P6) are arranged on the safety valve pressure relief pipeline (9);
one end of the liquid phase return pipeline (11) is connected with the hydrolyzer body (1), the other end of the liquid phase return pipeline is connected with the urea storage tank, and a fifth automatic switch valve (21) is arranged on the liquid phase return pipeline (11);
and the waste liquid pipeline (12) is connected with the hydrolyzer body (1).
2. The urea hydrolysis device according to claim 1, further comprising a purge steam line (10), wherein the purge steam line (10) is connected to the product gas line (7) through a first branch, wherein a first automatic steam purge switching valve (16) is provided on the first branch, wherein the first branch is connected to the gas phase pressure relief line (8) through a second branch, wherein a second automatic steam purge switching valve (17) is provided on the second branch, wherein the first branch is connected to the safety valve pressure relief line (9) through a third branch, wherein a third automatic steam purge switching valve (18) is provided on the third branch, wherein the purge steam line (10) is connected to the liquid phase return line (11) through a fourth branch, wherein a fourth automatic steam purge switching valve (19) is provided on the fourth branch, and wherein the purge steam line (10) is connected to the waste liquid line (12) through a fifth branch, and a fifth automatic steam purging switch valve (20) is arranged on the fifth branch.
3. The urea hydrolysis apparatus according to claim 1, further comprising a control system for controlling the safety valve (26) to open when the sixth pressure transmitter (P6) detects that the pressure of the hydrolyzer body (1) exceeds 1.2 Mpa.
4. The urea hydrolysis apparatus according to claim 1, wherein the roots of the first radar level gauge (L1), the second radar level gauge (L2), and the third radar level gauge (L3) are filled with a high temperature resistant plastic, and electric tracing is provided outside the roots of the first radar level gauge (L1), the second radar level gauge (L2), and the third radar level gauge (L3).
5. The urea hydrolysis device according to claim 2, wherein the hydrolyzer body (1), the urea line (6), the heating steam line (2), the condensate line (3), the demineralized water line (4), the catalyst line (5), the product gas line (7), the gas phase pressure relief line (8), the safety valve pressure relief line (9), the liquid phase return line (11), the purge steam line (10), the first automatic on-off valve (22), the first automatic regulating valve (14), the on-site pressure gauge (P7), the first pressure transmitter (P1), the second pressure transmitter (P2), the third pressure transmitter (P3), the second automatic on-off valve (24), the second automatic regulating valve (13), the fourth pressure transmitter (P4), The third automatic switch valve (23), the valve, the third automatic regulating valve (15), the fifth pressure transmitter (P5), the fourth automatic switch valve (25), the safety valve (26), the sixth pressure transmitter (P6), the fifth automatic switch valve (21), the first automatic steam purging switch valve (16), the second automatic steam purging switch valve (17), the third automatic steam purging switch valve (18), the fourth automatic steam purging switch valve (19) and the fifth automatic steam purging switch valve (20) are all provided with electric tracing and heat insulation structures.
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