CN112413395B - Liquid ammonia conveying system and method - Google Patents
Liquid ammonia conveying system and method Download PDFInfo
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- CN112413395B CN112413395B CN201910777061.1A CN201910777061A CN112413395B CN 112413395 B CN112413395 B CN 112413395B CN 201910777061 A CN201910777061 A CN 201910777061A CN 112413395 B CN112413395 B CN 112413395B
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 505
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000007788 liquid Substances 0.000 claims abstract description 44
- 238000004519 manufacturing process Methods 0.000 claims abstract description 33
- 238000003860 storage Methods 0.000 claims description 57
- 238000010992 reflux Methods 0.000 claims description 26
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 22
- 230000001105 regulatory effect Effects 0.000 claims description 14
- 229910052757 nitrogen Inorganic materials 0.000 claims description 10
- 238000002716 delivery method Methods 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims 1
- 238000013461 design Methods 0.000 description 15
- 238000012546 transfer Methods 0.000 description 12
- 229910021529 ammonia Inorganic materials 0.000 description 7
- 239000000243 solution Substances 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000012946 outsourcing Methods 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000002706 hydrostatic effect Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000010963 304 stainless steel Substances 0.000 description 1
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000012824 chemical production Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000011494 foam glass Substances 0.000 description 1
- 239000000383 hazardous chemical Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000004630 mental health Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
- F17C5/02—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with liquefied gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
- F17C7/02—Discharging liquefied gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/08—Pipe-line systems for liquids or viscous products
- F17D1/084—Pipe-line systems for liquids or viscous products for hot fluids
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
- F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
- F17C2223/0146—Two-phase
- F17C2223/0153—Liquefied gas, e.g. LPG, GPL
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention provides a liquid ammonia conveying system and a method. The invention provides a liquid ammonia delivery system, comprising: liquid ammonia produces the device, liquid ammonia send power device outward and set up the liquid ammonia buffer between liquid ammonia production device and liquid ammonia send power device outward, wherein, the liquid ammonia among the liquid ammonia production device exports through the liquid ammonia delivery pump among the liquid ammonia send power device outward, and, be provided with pressure device on the liquid ammonia buffer, pressure device is used for when the liquid level in the liquid ammonia production device is less than predetermineeing the height, improve the output pressure of liquid ammonia buffer output, so that output pressure is greater than the starting pressure threshold value of liquid ammonia delivery pump. The liquid ammonia conveying system provided by the invention effectively eliminates the hidden troubles of the remaining liquid ammonia to production and equipment, and ensures the personal safety of operators.
Description
Technical Field
The invention relates to the field of chemical industry, in particular to a liquid ammonia conveying system and a liquid ammonia conveying method.
Background
In the field of chemical production, a liquid ammonia conveying device is a key link in production and operation of a synthetic ammonia system, and in a normal production process, a part of produced products of the synthetic ammonia system are conveyed to a liquid ammonia storage tank by the liquid ammonia conveying device to be stored for later use. In addition, when the synthetic ammonia system has an abnormal condition in the operation stage, the liquid ammonia in the liquid ammonia storage tank must be sent out to ensure that the whole production is not interrupted so as to meet the requirement of normal operation of the system. In addition, when the liquid ammonia storage tank needs to be overhauled, all the liquid ammonia in the liquid ammonia storage tank needs to be transported out. Therefore, the quality of the liquid ammonia delivery device will determine the normal operation of the whole system. The liquid ammonia pump is the most key outward-sending power equipment in the liquid ammonia conveying device, and conveys the liquid ammonia in the liquid ammonia storage tank to users, the pump is a shielding pump, and a suction inlet of the pump is horizontally connected with a liquid outlet pipeline of the liquid ammonia storage tank. But when the liquid ammonia in the liquid ammonia storage tank is at a low liquid level, the liquid ammonia pump cannot be started to finish the liquid ammonia conveying work.
Because liquid ammonia has corrosivity and volatilizes easily, the liquid ammonia of leaving over is deposited for a long time, not only causes huge potential safety hazard to personnel, production and equipment, wastes a large amount of liquid ammonia products and energy moreover, neither does not benefit to energy-concerving and environment-protective, also influences staff's physical and mental health. There is a need for a liquid ammonia delivery system that delivers liquid ammonia smoothly and completely.
Disclosure of Invention
The invention provides a liquid ammonia conveying system and a liquid ammonia conveying method, which realize smooth and thorough delivery of liquid ammonia, effectively eliminate hidden troubles of production and equipment caused by the remaining liquid ammonia and ensure the personal safety of operators.
In a first aspect, the present invention provides a liquid ammonia delivery system comprising: the device comprises a liquid ammonia generating device, a liquid ammonia delivery power device and a liquid ammonia buffer device arranged between the liquid ammonia generating device and the liquid ammonia delivery power system;
liquid ammonia in the liquid ammonia generating device is output by a liquid ammonia delivery pump in the liquid ammonia delivery power device;
be provided with pressure device on the liquid ammonia buffer device, pressure device is used for when the liquid level in the liquid ammonia production device is less than preset height, improves the output pressure of liquid ammonia buffer device output, so that output pressure is greater than the starting pressure threshold value of liquid ammonia delivery pump.
In one possible design, the liquid ammonia buffer device includes: a liquid ammonia buffer tank;
the upper part of the liquid ammonia buffer tank is connected with the lower part of the liquid ammonia generating device through a liquid ammonia supply line;
and the lower part of the liquid ammonia buffer tank is connected with the input end of the liquid ammonia delivery pump through a liquid ammonia outflow line.
In one possible design, the liquid ammonia buffer device further includes: a liquid ammonia reflux line;
the output end of the liquid ammonia delivery pump is connected with the upper part of the liquid ammonia buffer tank through the liquid ammonia return line.
In one possible design, the liquid ammonia buffer device further includes: a pressure relief line and a liquid level indicator;
one end of the pressure relief line is connected with the upper part of the liquid ammonia buffer tank, and the other end of the pressure relief line is communicated with the outside through a pressure relief valve;
the liquid level indicator is used for displaying the liquid level height in the liquid ammonia buffer tank.
In one possible design, the pressurizing device is a nitrogen pressurizing device;
the output end of the pressurizing device is connected with the upper part of the liquid ammonia buffer tank through a pressure reducing valve, and a first pressure gauge is further connected between the pressure reducing valve and the upper part of the liquid ammonia buffer tank.
Optionally, the liquid ammonia generation device comprises: a liquid ammonia storage tank and a pressure control regulating valve group;
the upper part of the liquid ammonia storage tank is connected with the pressure control and regulation valve bank, and the pressure control and regulation valve bank is used for regulating the internal pressure of the liquid ammonia storage tank;
the lower part of the liquid ammonia storage tank is connected with the upper part of the liquid ammonia buffer tank through a liquid ammonia supply line;
and an outlet valve is arranged on the liquid ammonia supply line, and a second pressure gauge is arranged between the outlet valve and the liquid ammonia buffer tank.
In a possible design, a first reflux valve is arranged on the liquid ammonia reflux line;
the output end of the liquid ammonia delivery pump is connected with the upper part of the liquid ammonia storage tank through a storage tank return line, and a second return valve is arranged on the storage tank return line.
In a possible design, a third pressure gauge is further arranged between the second reflux valve and the output end of the liquid ammonia delivery pump.
In one possible design, the liquid ammonia delivery power plant includes: a liquid ammonia heater and an automatic temperature control and adjustment valve group;
the input end of the liquid ammonia heater is connected with the output end of the liquid ammonia delivery pump;
the output end of the liquid ammonia heater is connected with external equipment through a liquid ammonia conveying line;
one end of the automatic temperature control regulating valve group is connected to the liquid ammonia conveying line, and the other end of the automatic temperature control regulating valve group is connected to the input end of the liquid ammonia heater.
In a second aspect, the present invention provides a method of liquid ammonia delivery comprising:
and when the liquid level in the liquid ammonia generating device is smaller than the preset height, starting the pressurizing device to enable the output pressure of the output end of the liquid ammonia buffer device to be larger than the starting pressure threshold value of the liquid ammonia delivery pump. According to the liquid ammonia conveying system and method, the liquid ammonia buffer device is arranged between the liquid ammonia generating device and the liquid ammonia outward-conveying power device, liquid ammonia in the liquid ammonia generating device needs to be output through the liquid ammonia conveying pump in the liquid ammonia outward-conveying power device, the output pressure of the output end of the liquid ammonia buffer device is improved through the pressurizing device on the liquid ammonia buffer device, so that the output pressure is larger than the starting pressure threshold value of the liquid ammonia conveying pump, when the liquid level in the liquid ammonia generating device is smaller than the preset height, the liquid ammonia conveying pump in the liquid ammonia outward-conveying power device can still be normally started, the liquid ammonia in the liquid ammonia generating device is smoothly and thoroughly conveyed outwards according to the requirements of users, potential hazards of the remaining liquid ammonia to production and equipment are effectively eliminated, and the personal safety of operators is guaranteed.
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 embodiments or the description of the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a prior art liquid ammonia delivery system;
FIG. 2 is a schematic diagram of a liquid ammonia delivery system according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of a liquid ammonia delivery method according to an embodiment of the present invention.
Reference numerals:
11: a liquid ammonia storage tank;
12: a pressure control regulating valve group;
21: a liquid ammonia transfer pump;
22: a liquid ammonia heater;
23: a temperature automatic control regulating valve group;
212: a liquid ammonia conveying line;
213: a tank return line;
31: a liquid ammonia buffer tank;
32: a pressurizing device;
311: a liquid ammonia supply line;
312: a liquid ammonia outflow line;
313: a pressure relief line;
314: a liquid level indicator;
315: a liquid ammonia reflux line;
316: a pressure reducing valve;
317: a pressure relief valve;
318: an outlet valve;
319: a first reflux valve;
320: a first pressure gauge;
321: a second pressure gauge;
322: a third pressure gauge;
323: a second reflux valve.
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.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Moreover, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a schematic diagram of a liquid ammonia delivery system in the prior art. As shown in fig. 1, in the prior art, a liquid ammonia delivery system includes a liquid ammonia generation device and a liquid ammonia delivery power device, wherein a liquid ammonia storage tank is disposed in the liquid ammonia generation device. The volume of the liquid ammonia storage tank is 5000m 3 The storage capacity at an operating temperature of-32 ℃ is 3400 tons (liquid ammonia density is 680 kg/m) 3 ) The normal operating pressure was 7 to 17kPa, and the design pressure was 26kPa. The structure of liquid ammonia storage tank is usually designed to be single heat preservation wall dome structure, and the appearance is cylindrical, and the liquid ammonia storage tank supports on the pile foundation, and the tank bottoms keeps warm with bearing foam glass, total height 22m.
During the actual operation of liquid ammonia conveying system, when the ammonia tank liquid level drops to 20% and below, when corresponding liquid ammonia storage tank liquid level drops to 22m 20% =4.4m, the transfer pump among the power device is sent outward to the liquid ammonia then can't start, consequently, lead to 3400 ton 20% =680 ton liquid ammonia can't be carried out, the liquid ammonia of leaving over in the liquid ammonia storage tank causes huge potential safety hazard to production and equipment, and waste a large amount of liquid ammonia products and energy, neither do benefit to energy-concerving and environment-protective, also increase product manufacturing cost.
Therefore, in the liquid ammonia delivery system, a liquid ammonia delivery pump in the liquid ammonia delivery power device is a key device. The liquid ammonia in the liquid ammonia storage tank is delivered to a user, the pump is a shielding pump, a suction inlet of the shielding pump is horizontally connected with a liquid outlet pipeline of the liquid ammonia storage tank, and the bottom of the liquid ammonia storage tank is 0.8m above the liquid outlet pipeline under the normal condition. Before the pump is put into operation, the pump must be cooled to the operating temperature of-32 ℃, liquid ammonia enters the inlet of the pump, and vapor ammonia and liquid are discharged from the pump shell and return to the liquid ammonia storage tank.
The liquid ammonia delivery pump is a shield pump, corresponds to 100% rated flow, and has cavitation allowance of NPSHr =2.2m. For a liquid ammonia delivery shield pump susceptible to cavitation, the following concepts exist:
(1)、NPSH 1 the device cavitation margin, also called the effective cavitation margin, is provided by the suction device. NPSH 1 Larger pumps are less susceptible to cavitation.
(2) The required cavitation allowance is the cavitation performance parameter to be achieved by the specified pump, and the smaller the NPSHr is, the better the cavitation resistance of the pump is.
(3) And calculating the installation height of the liquid ammonia delivery pump as follows:
NPSH 1 ＝NPSH r +K
NPSH 1 ＝P c /ρg-Hg-Hc-P v /ρg＝NPSH r +K
Hg＝P c /ρg-Hc-NPSH r -P v /ρg-K
K＝(0.1～0.5)NPSH r
in the above formula:
P C /[ rho ] g-absolute pressure head (m) of the suction liquid level;
hg — installation height of pump, also called geometric suction height (m);
hc is the pipeline resistance loss (m) from the liquid ammonia storage tank to the pump inlet.
Calculating liquid ammonia at the inlet of an impeller of the liquid ammonia delivery pump at-30 ℃, wherein the corresponding saturated vapor pressure is 120kPa, and the installation height of the pump is as follows:
Hg＝(87000+17000)/681×9.8－0.0345－(120000/681×9.8)－2.2×1.5
＝－5.36m
the original installation height of the liquid ammonia transfer pump is 0.8m (the distance from the bottom of the liquid ammonia transfer tank to the center of the suction inlet of the shielding pump), which is 4.56m lower than the theoretical calculation value, and the low liquid level (20% to meet the requirement of the pump) can not be satisfiedLower), the hydrostatic head P of the suction canister must be increased c And/[ rho ] g.0.1MPa (calculated by clear water) is equivalent to 10m of static head, so that the problems of difficult suction during the starting of the pump and no pressure rise during continuous operation caused by pipeline resistance and a liquid ammonia saturated steam pressure head at the temperature of minus 30 ℃ can be solved by only increasing the pressure of a suction tank to 45.6 kPa. However, the liquid ammonia tank was an atmospheric tank, and the design pressure was 26kPa, and it was not possible to pressurize the ammonia tank to 45.6 kPa. Or, according to the theoretical calculation value, if the liquid ammonia delivery shield pump is installed 5.36m below the ground, the operator must go down to an operation platform 5.36m below the ground to operate. This is a limited operation, while liquid ammonia is a hazardous chemical, which undoubtedly adds a great safety risk.
In view of the problems in the prior art, the liquid ammonia delivery system provided by the present invention comprises a liquid ammonia generating device, a liquid ammonia delivery power device, and a liquid ammonia buffer device disposed between the liquid ammonia generating device and the liquid ammonia delivery power device. And when the liquid level in the liquid ammonia generating device is lower than the preset height, starting a pressurizing device in the liquid ammonia buffer device so as to enable the output pressure of the output end of the liquid ammonia buffer device to be higher than the starting pressure threshold value of the liquid ammonia delivery pump. Thereby, even when the liquid level in the liquid ammonia production device is less than when predetermineeing the height, the liquid ammonia delivery pump among the liquid ammonia delivery power device still can be by normal start, can produce the liquid ammonia in the device with the liquid ammonia smoothly and thoroughly according to user's demand delivery outward, effectively eliminated the hidden danger of leaving over liquid ammonia to production and equipment to operating personnel's personal safety has been ensured.
The technical solution of the present invention will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Fig. 2 is a schematic structural view of a liquid ammonia delivery system according to an embodiment of the present invention, and as shown in fig. 2, the liquid ammonia delivery system according to the embodiment of the present invention includes:
the liquid ammonia generating device, the liquid ammonia delivery power device and the liquid ammonia buffer device are arranged between the liquid ammonia generating device and the liquid ammonia delivery power device;
liquid ammonia in the liquid ammonia generating device is output by a liquid ammonia delivery pump 21 in the liquid ammonia outward power device;
be provided with pressure device 32 on the liquid ammonia buffer device, pressure device 32 is used for when the liquid level in the liquid ammonia production device is less than preset the height, improves the output pressure of liquid ammonia buffer device output to make output pressure be greater than the starting pressure threshold of liquid ammonia delivery pump 21.
Set up a liquid ammonia buffer device between liquid ammonia production device and liquid ammonia outsourcing power device, when liquid ammonia in the liquid ammonia production device needs the outsourcing, its liquid ammonia exports through the liquid ammonia delivery pump among the liquid ammonia outsourcing power device. Be provided with pressure device 32 on liquid ammonia buffer, liquid ammonia delivery pump 21 among the power device is sent outward to liquid ammonia does not have enough static pressure head to start when the liquid level in the liquid ammonia production device is less than preset the height, at this moment, opens the pressure device 32 of the liquid ammonia buffer that sets up between liquid ammonia production device and the power device is sent outward to liquid ammonia to improve the output pressure of liquid ammonia buffer output, make output pressure be greater than the starting pressure threshold value of liquid ammonia delivery pump 21.
The liquid ammonia conveying system that this embodiment provided, send power device outward through at liquid ammonia production device and liquid ammonia and set up liquid ammonia buffer, liquid ammonia in the liquid ammonia production device needs to export via the liquid ammonia delivery pump in the power device is sent outward to the liquid ammonia, pressure device through on the liquid ammonia buffer improves the output pressure of liquid ammonia buffer output, so that output pressure is greater than the starting pressure threshold value of liquid ammonia delivery pump, when the liquid level in the liquid ammonia production device is less than predetermineeing highly, the liquid ammonia delivery pump among the power device is sent outward to the liquid ammonia still can normally be started, and send out the liquid ammonia in the liquid ammonia production device smoothly and thoroughly according to the user's demand outward, effectively eliminated the hidden danger of liquid ammonia of leaving over to production and equipment, and ensured operating personnel's personal safety.
In one possible design, the liquid ammonia buffer device includes a liquid ammonia buffer tank 31.
The upper part of the liquid ammonia buffer tank 31 is connected with the lower part of the liquid ammonia generating device through a liquid ammonia supply line 311;
the lower part of the liquid ammonia buffer tank 31 is connected with the input end of the liquid ammonia delivery pump 21 through a liquid ammonia outflow line 312.
In this embodiment, the liquid ammonia buffer device includes a liquid ammonia buffer tank 31, the upper part of the liquid ammonia buffer tank 31 is connected to the lower part of the liquid ammonia generator through a liquid ammonia supply line 311, the lower part of the liquid ammonia buffer tank 31 is connected to the input end of a liquid ammonia delivery pump 21 through a liquid ammonia outflow line 312, and through such connection, the liquid ammonia buffer tank 31 is connected to the liquid ammonia delivery system.
Wherein, the liquid ammonia buffer tank 31 can be designed as a low pressure vessel with a design pressure of 1000kPa (which can be realized in practical operation). For example, the liquid ammonia buffer tank 31 may be designed as a container having a cylindrical middle portion and a semi-ellipsoidal structure at both ends, as shown in fig. 3, and the configuration is advantageous for improving the stability of the liquid ammonia buffer device in practical operation.
Specifically, the volume of the liquid ammonia buffer tank 31 can be designed to be about 4.66m 3 The cylinder of (2) and the container with two semi-ellipsoidal structures. In actual operation, for 3400 ton of liquid ammonia, the operating power of the liquid ammonia transfer pump 21 is set to 100m according to the rated flow rate of the pump 3 The calculation of the flow rate is that 3400 ton of liquid ammonia needs 28 minutes for 100 percent of the liquid ammonia is delivered, and if the working power of the liquid ammonia delivery pump 21 is 50 percent of the rated flow rate of the pump, namely 50m 3 56 minutes were required for 100% of 3400 tonnes of liquid ammonia to be transferred.
In one possible design, the liquid ammonia buffer device further comprises a pressure relief line 313 and a liquid level indicator 314.
One end of the pressure relief line 313 is connected with the upper part of the liquid ammonia buffer tank 31, and the other end is communicated with the outside through a pressure relief valve 317; the liquid level indicator 314 is used to display the liquid level height in the liquid ammonia buffer tank 31.
The pressure of the output end of the liquid ammonia buffer tank 31 reaches the starting threshold of the liquid ammonia delivery pump 21, and after the liquid ammonia delivery pump 21 operates normally, the pressure in the liquid ammonia buffer tank 31 is released through the pressure release line 313 to maintain the normal operation of the liquid ammonia delivery pump 21.
The level indicator 314 is used to display the liquid level height in the liquid ammonia buffer tank 31. Before the pressurization operation of the liquid ammonia buffer tank 31, the liquid level indicator 314 is used to confirm that the liquid level of the liquid ammonia buffer tank 31 has reached 100%, and the liquid ammonia in the liquid ammonia generation device is injected into the liquid ammonia buffer tank 31 to perform the pressurization operation.
In one possible design, the pressurization device 32 is a nitrogen pressurization device.
Wherein, the output end of the pressurizing device 32 is connected with the upper part of the liquid ammonia buffer tank 31 through a pressure reducing valve 316; a first pressure gauge 320 is connected between the pressure reducing valve 316 and the upper part of the liquid ammonia buffer tank 31.
In the ammonia synthesis industry, nitrogen belongs to one of reaction raw materials of the process, and the pressurizing device 32 is set as a nitrogen pressurizing device, so that the operation is simple and the implementation is easy. Of course, other harmless gases may be used to fill the pressurizing device 32, and the present embodiment is not limited to the gas used for pressurizing. The liquid ammonia buffer tank 31 is pressurized by the nitrogen gas pressurizing device, the pressure reducing valve 316 connected between the pressurizing device 32 and the upper part of the liquid ammonia buffer tank 31 is opened, and the indication condition of the first pressure gauge 320 is observed to confirm the pressure value applied to the inside of the liquid ammonia buffer tank 31. The pressure can be increased to 50kPa to meet the required hydrostatic head for normal actuation of liquid ammonia transfer pump 21.
Optionally, the liquid ammonia generating device includes a liquid ammonia storage tank 11 and a pressure control regulating valve set 12.
Wherein, the upper part of the liquid ammonia storage tank 11 is connected with a night control and regulation valve group 12. The pressure control and regulation valve bank is used for regulating the internal pressure of the liquid ammonia storage tank 11; the lower part of the liquid ammonia storage tank 11 is connected with the upper part of the liquid ammonia buffer tank 11 through a liquid ammonia supply line 311; an outlet valve 318 is provided in the liquid ammonia supply line 311, and a second pressure gauge 321 is provided between the outlet valve 318 and the liquid ammonia buffer tank 11.
The liquid ammonia tank 11 is used for the liquid ammonia production device to store a part of the produced product therein, to be sent out through the liquid ammonia delivery system when necessary. The pressure control and regulation valve group 12 arranged at the upper part of the liquid ammonia storage tank 11 is used for regulating the internal pressure of the liquid ammonia storage tank 11 so as to stably keep the internal pressure in the pressure range of 7-17 kPa.
The liquid ammonia supply line 311 is used to inject the liquid ammonia in the liquid ammonia tank 11 into the liquid ammonia buffer tank 31. The outlet valve 318 is used to control the injection of the liquid ammonia into the liquid ammonia storage tank 11 or to stop the injection into the liquid ammonia buffer tank 31. A second pressure gauge 321 provided between the outlet valve 318 and the liquid ammonia buffer tank 31, for indicating a pressure value at the end of the liquid ammonia buffer tank 31 connected to the liquid ammonia supply line 318.
In one possible design, a first reflux valve 319 is provided on the liquid ammonia reflux line 315; the output end of the liquid ammonia delivery pump 21 is connected with the upper part of the liquid ammonia storage tank 11 through a storage tank return line 213, and the storage tank return line 213 is provided with a second return valve 323.
Optionally, a third pressure gauge 322 is provided between the second reflux valve 323 and the output of the liquid ammonia delivery pump 21.
After the output pressure of the output end of the liquid ammonia buffer device is increased by the pressurizing device 32, the liquid ammonia delivery pump 21 is normally started but does not enter the stable operation stage, and when the outlet pressure of the liquid ammonia delivery pump 21 reaches a threshold value, for example, 2000kPa, and the pressure value is displayed by reading of the third pressure gauge 322, the second reflux valve 323 is opened to reflux liquid ammonia to the liquid ammonia storage tank 11 through the storage tank reflux line 213, so as to control the outlet pressure of the liquid ammonia delivery pump 21, for example, to maintain the outlet pressure of the liquid ammonia delivery pump 21 at 1600kPa.
When the liquid ammonia transfer pump 21 has been normally started and stably operated, the return valve 319 is opened to inject a part of the liquid ammonia back into the liquid ammonia buffer tank 11 through the return line 315 to control the outlet pressure of the liquid ammonia transfer pump 21, for example, to control the outlet pressure of the liquid ammonia transfer pump 21 to be stabilized at 1400 to 1600kPa. The outlet pressure is indicated by a reading of a third pressure gauge 322.
In one possible design, the liquid ammonia delivery power unit includes a liquid ammonia heater 22 and an automatic temperature control and regulation valve bank 23.
Wherein, the input of liquid ammonia heater 22 is connected with the output of liquid ammonia delivery pump 21, and the output of liquid ammonia heater 22 passes through liquid ammonia transfer chain 212 and is connected with external equipment, and the one end of temperature control governing valve 23 is connected on liquid ammonia transfer chain 212, and the other end is connected with the input of liquid ammonia heater 22.
When the liquid ammonia delivery pump 21 operates stably, the liquid ammonia delivery power device delivers the liquid ammonia through the liquid ammonia delivery line 212 according to the requirements of external equipment. In the output process, if the external device needs, the liquid ammonia supplied outside can be heated to the required temperature by the liquid ammonia heater 22, wherein the temperature automatic control and adjustment valve group 23 is used for adjusting the temperature of the liquid ammonia supplied outside.
Alternatively, in the above embodiments, all the pipeline connections may be welded, the valve may be flanged, and the pipeline and the valve may be made of 304 stainless steel.
The above is illustrated by a detailed example below:
when the liquid level in the liquid ammonia generation device is lower than the preset height, for example, when the liquid level is reduced to 20% of the original liquid level, within the time period from 28 minutes to 56 minutes, the liquid ammonia delivery pump 21 can be put into the normal liquid ammonia delivery state by using the liquid ammonia delivery system provided by the embodiment of the present invention, which is specifically as follows:
first, the outlet valve 318 is opened so that liquid ammonia is injected from the liquid ammonia tank 11 into the liquid ammonia buffer tank 31 through the liquid ammonia feed line 311, and when the liquid level indicator 314 on the liquid ammonia buffer tank 31 indicates that the liquid level is full, the outlet valve 318 is closed. The method comprises the steps of applying pressure to a liquid ammonia buffer tank 31 by using a nitrogen pressurizing device, simultaneously opening a pressure reducing valve 316, observing readings of a first pressure gauge 320, starting a liquid ammonia delivery pump 21 when the readings of the first pressure gauge 320 show 50kPa, observing readings of a third pressure gauge 322, opening a second reflux valve 323 after the readings of the third pressure gauge 322 show 2000kPa and are stabilized for a certain time, refluxing liquid ammonia to a liquid ammonia storage tank 11 through a reflux line 213, controlling the outlet pressure of the liquid ammonia delivery pump 21, namely stabilizing the readings of the third pressure gauge 322 at 1600kPa, controlling the internal pressure of the liquid ammonia storage tank 11 to be maintained at 7-17kPa through a pressure control regulating valve group 12, so that the internal pressure is not more than 17kPa, and after the operation of the liquid ammonia delivery pump 21 is stabilized, namely stabilizing the readings of the third pressure gauge 322 at 1600kPa, and controlling the pressure of the liquid ammonia storage tank 11 to be not more than 17kPa. At this time, the pressure release valve 317 is opened, the nitrogen charged in the liquid ammonia buffer tank 31 is discharged to the torch through the pressure release line 313, and when the reading of the first pressure gauge 320 is consistent with the display of the second pressure gauge 321, the pressure release valve 317 is closed. And slowly opening the outlet valve 318, wherein the inlet of the liquid ammonia delivery pump 21 has a pumping effect during normal operation, pumping up the liquid ammonia in the liquid ammonia storage tank 11 through the liquid ammonia buffer tank 21, and then returning the liquid ammonia to the liquid ammonia storage tank 11 through the return line 213 to confirm that the refilling operation of the liquid ammonia delivery pump 21 is normal. Finally, the second reflux valve 323 is closed, and the liquid ammonia in the liquid ammonia storage tank 11 is smoothly delivered out through the liquid ammonia delivery line 212 according to the needs of external equipment. If required by the external equipment, the outgoing liquid ammonia may be heated to a desired temperature by the liquid ammonia heater 22. And after the liquid ammonia is stably delivered from the liquid ammonia delivery pump 21, opening the first reflux valve 319, and injecting the liquid ammonia in the liquid ammonia delivery pump 21 back into the liquid ammonia buffer tank 31, so as to maintain the outlet pressure of the liquid ammonia delivery pump 21 to be 1400-1600kPa.
The liquid ammonia conveying system that this embodiment provided, through set up liquid ammonia buffer device between liquid ammonia production device and the liquid ammonia power device that delivers outward, include the liquid ammonia buffer tank in the liquid ammonia buffer device, through nitrogen gas pressure device, improve the output pressure of liquid ammonia buffer tank output, so that output pressure is greater than the starting pressure threshold value of liquid ammonia delivery pump, when liquid level in the liquid ammonia production device is less than when predetermineeing the height, the liquid ammonia delivery pump still is started, and form the suction effect when normal operating at its entry, and then, according to the needs of external equipment, deliver the liquid ammonia in the liquid ammonia storage tank outward smoothly through the liquid ammonia transfer chain. Effectively eliminated and left over the hidden danger of liquid ammonia to production and equipment to guaranteed operating personnel's personal safety, had the advantage that the investment is few, the practicality is strong, easy operation, degree of automatic control is strong.
Based on the foregoing embodiments, fig. 3 is a schematic flow chart of a liquid ammonia delivery method according to an embodiment of the present invention, and as shown in fig. 3, the liquid ammonia delivery method according to an embodiment of the present invention includes:
s101: when the liquid level in the liquid ammonia generation device is less than the preset height, the pressurizing device 32 is started.
S102: the output pressure of the output end of the liquid ammonia buffer device is made to be larger than the starting pressure threshold value of the liquid ammonia delivery pump 21.
When the liquid level in the liquid ammonia generating device, specifically the liquid level in the liquid ammonia storage tank 11, is lower than the preset height, for example, when the liquid level is reduced to 20% of the full liquid level, the liquid ammonia delivery pump 21 in the liquid ammonia delivery power device cannot be normally started because of insufficient static head pressure, and at this time, the pressurizing device 32 is started, for example, a nitrogen pressurizing device may be used to apply pressure to the liquid ammonia buffer device, specifically the liquid ammonia buffer tank 31, so that the output pressure at the output end of the liquid ammonia buffer tank 31 is greater than the starting pressure threshold of the liquid ammonia delivery pump 21, and after the liquid ammonia delivery pump 21 is normally operated and suction is formed at the inlet thereof, the liquid ammonia in the liquid ammonia storage tank 11 is smoothly delivered out through the liquid ammonia delivery line 212 according to the needs of external equipment.
The liquid ammonia delivery method that this embodiment provided, when the liquid level in the liquid ammonia production device is less than and predetermines the height, through setting up pressure device, make the output pressure of liquid ammonia buffer device output be greater than the starting pressure threshold value of liquid ammonia delivery pump, the suction effect when the entry of liquid ammonia delivery pump forms normal operation, according to the needs of external equipment, send out the liquid ammonia in the liquid ammonia production device smoothly outward. Effectively eliminated and left over liquid ammonia to the hidden danger for production and equipment to ensured operating personnel's personal safety, had the advantage that the investment is few, the practicality is strong, easy operation, and the automatic control degree is strong.
In the description of the present invention, it is to be understood that the terms "center", "length", "width", "thickness", "top", "bottom", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", "axial", "circumferential", and the like, as used herein, indicate an orientation or positional relationship based on that shown in the drawings, merely to facilitate the description of the invention and to simplify the description, and do not indicate or imply that the position or element referred to must have a particular orientation, be of particular construction and operation, and therefore, should not be considered as limiting the invention.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integral; may be mechanically coupled, may be electrically coupled or may be in communication with each other; either directly or indirectly through intervening media, such as through internal communication or through an interaction between two elements.
The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art. Unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact with each other through another feature therebetween.
Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (3)
1. A liquid ammonia delivery system, comprising: the device comprises a liquid ammonia generating device, a liquid ammonia delivery power device and a liquid ammonia buffer device arranged between the liquid ammonia generating device and the liquid ammonia delivery power device;
liquid ammonia in the liquid ammonia generating device is output by a liquid ammonia delivery pump in the liquid ammonia delivery power device;
the liquid ammonia buffer device includes: a liquid ammonia buffer tank; the upper part of the liquid ammonia buffer tank is connected with the lower part of the liquid ammonia generating device through a liquid ammonia supply line; the lower part of the liquid ammonia buffer tank is connected with the input end of the liquid ammonia delivery pump through a liquid ammonia outflow line; the liquid ammonia buffer device further comprises: the liquid level indicator is used for displaying the liquid level height in the liquid ammonia buffer tank;
the liquid ammonia buffer device is provided with a pressurizing device, and the pressurizing device is used for increasing the output pressure of the output end of the liquid ammonia buffer device when the liquid level in the liquid ammonia generating device is smaller than a preset height, so that the output pressure is larger than the starting pressure threshold of the liquid ammonia delivery pump; the pressurizing device is a nitrogen pressurizing device;
the output end of the pressurizing device is connected with the upper part of the liquid ammonia buffer tank through a pressure reducing valve, and a first pressure gauge is connected between the pressure reducing valve and the upper part of the liquid ammonia buffer tank;
the liquid ammonia production device includes: a liquid ammonia storage tank and a pressure control regulating valve group;
the upper part of the liquid ammonia storage tank is connected with the pressure control and regulation valve bank, and the pressure control and regulation valve bank is used for regulating the internal pressure of the liquid ammonia storage tank;
an outlet valve is arranged on the liquid ammonia supply line, and a second pressure gauge is arranged between the outlet valve and the liquid ammonia buffer tank;
the output end of the liquid ammonia delivery pump is connected with the upper part of the liquid ammonia storage tank through a storage tank return line, a second return valve is arranged on the storage tank return line, a third pressure gauge is arranged between the second return valve and the output end of the liquid ammonia delivery pump, and the third pressure gauge is used for indicating the outlet pressure of the liquid ammonia delivery pump; the second reflux valve is in an open state after the outlet pressure of the liquid ammonia delivery pump reaches a first preset threshold value and is maintained for a first preset time, and the second reflux valve is used for refluxing liquid ammonia to the liquid ammonia storage tank through a storage tank reflux line so as to control the outlet pressure of the liquid ammonia delivery pump;
when the outlet pressure of the liquid ammonia delivery pump is stabilized at a second preset threshold value and the internal pressure of the liquid ammonia storage tank is maintained within a first preset range, the liquid ammonia delivery pump is in a stable operation state, and the second preset threshold value is smaller than the first preset threshold value;
the liquid ammonia buffer device further comprises: one end of the pressure relief line is connected with the upper part of the liquid ammonia buffer tank, and the other end of the pressure relief line is communicated with the outside through a pressure relief valve; the pressure relief line is used for releasing the nitrogen filled in the liquid ammonia buffer tank to a torch and discharging the nitrogen when the liquid ammonia delivery pump is in a stable operation state;
the liquid ammonia buffer device further comprises: a liquid ammonia reflux line; the output end of the liquid ammonia delivery pump is connected with the upper part of the liquid ammonia buffer tank through the liquid ammonia return line; a first reflux valve is arranged on the liquid ammonia reflux line; when the liquid ammonia is stably delivered out of the liquid ammonia delivery pump, the first reflux valve reinjects the liquid ammonia in the liquid ammonia delivery pump to the liquid ammonia buffer tank so as to maintain the pressure of the outlet of the liquid ammonia delivery pump to be stable; wherein, the liquid ammonia delivery pump is sent out liquid ammonia and is stabilized including: the liquid ammonia delivery pump is in the stable operation state and the liquid ammonia delivery pump operates normally after reinjection.
2. The liquid ammonia delivery system of claim 1, wherein the liquid ammonia delivery power plant comprises: a liquid ammonia heater and an automatic temperature control and adjustment valve group;
the input end of the liquid ammonia heater is connected with the output end of the liquid ammonia delivery pump;
the output end of the liquid ammonia heater is connected with external equipment through a liquid ammonia conveying line;
one end of the automatic temperature control regulating valve group is connected to the liquid ammonia conveying line, and the other end of the automatic temperature control regulating valve group is connected to the input end of the liquid ammonia heater.
3. A liquid ammonia delivery method, for use in the liquid ammonia delivery system of claim 1 or 2, the method comprising:
and when the liquid level in the liquid ammonia generating device is smaller than the preset height, starting the pressurizing device to enable the output pressure of the output end of the liquid ammonia buffer device to be larger than the starting pressure threshold value of the liquid ammonia delivery pump.
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| CN113639202B (en) * | 2021-08-09 | 2024-08-13 | 烟台杰瑞石油装备技术有限公司 | Pumping equipment and control method thereof |
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| SU1130212A1 (en) * | 1983-02-02 | 1984-12-23 | Научно-Исследовательский И Проектно-Технологический Институт Жидких Удобрений | Apparatus for pumping ammonia |
| CN100580316C (en) * | 2007-12-19 | 2010-01-13 | 山东科技大学 | Continuous full-automatic enclosed recovery system for high temperature condensate water |
| CN101476668B (en) * | 2009-01-21 | 2011-12-14 | 北京博奇电力科技有限公司 | Ammonia gas supply system with liquid ammonia as raw materials |
| CN104391518A (en) * | 2014-11-06 | 2015-03-04 | 大连环友屏蔽泵有限公司 | Shielding pump pressure control system |
| CN205640205U (en) * | 2016-03-29 | 2016-10-12 | 中化重庆涪陵化工有限公司 | Synthetic ammonia liquid ammonia memory system |
| CN108224829B (en) * | 2016-12-14 | 2020-10-27 | 贵州芭田生态工程有限公司 | Liquid ammonia delivery system and liquid ammonia delivery method |
| CN106594517A (en) * | 2016-12-18 | 2017-04-26 | 南通江山农药化工股份有限公司 | Direct gasification system for liquid ammonia and gasification process for direct gasification system |
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