CN105198520A - Method for preventing burning explosion of ammonium nitrate in nitrate-sulfur-based compound fertilizer tower granulation production process - Google Patents
Method for preventing burning explosion of ammonium nitrate in nitrate-sulfur-based compound fertilizer tower granulation production process Download PDFInfo
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- CN105198520A CN105198520A CN201510500998.6A CN201510500998A CN105198520A CN 105198520 A CN105198520 A CN 105198520A CN 201510500998 A CN201510500998 A CN 201510500998A CN 105198520 A CN105198520 A CN 105198520A
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- heating steam
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- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 title claims abstract description 92
- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000005469 granulation Methods 0.000 title claims abstract description 31
- 230000003179 granulation Effects 0.000 title claims abstract description 31
- 239000003337 fertilizer Substances 0.000 title claims abstract description 30
- 238000004880 explosion Methods 0.000 title claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 title abstract description 7
- FPWVDXSTQKFZEI-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[SH4+2] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[SH4+2] FPWVDXSTQKFZEI-UHFFFAOYSA-N 0.000 title abstract description 5
- 239000000463 material Substances 0.000 claims abstract description 47
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims abstract description 20
- 238000012544 monitoring process Methods 0.000 claims abstract description 11
- 239000001103 potassium chloride Substances 0.000 claims abstract description 10
- 235000011164 potassium chloride Nutrition 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims description 172
- 238000010438 heat treatment Methods 0.000 claims description 62
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 53
- 238000002844 melting Methods 0.000 claims description 49
- 230000008018 melting Effects 0.000 claims description 49
- MZILPZDBVFUXMY-UHFFFAOYSA-N [O-][N+]([S])=O Chemical compound [O-][N+]([S])=O MZILPZDBVFUXMY-UHFFFAOYSA-N 0.000 claims description 21
- 239000002994 raw material Substances 0.000 claims description 20
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 claims description 5
- 229910000387 ammonium dihydrogen phosphate Inorganic materials 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 5
- 235000019837 monoammonium phosphate Nutrition 0.000 claims description 5
- 239000006012 monoammonium phosphate Substances 0.000 claims description 5
- 229910000402 monopotassium phosphate Inorganic materials 0.000 claims description 5
- 235000019796 monopotassium phosphate Nutrition 0.000 claims description 5
- GNSKLFRGEWLPPA-UHFFFAOYSA-M potassium dihydrogen phosphate Chemical compound [K+].OP(O)([O-])=O GNSKLFRGEWLPPA-UHFFFAOYSA-M 0.000 claims description 5
- LWIHDJKSTIGBAC-UHFFFAOYSA-K potassium phosphate Substances [K+].[K+].[K+].[O-]P([O-])([O-])=O LWIHDJKSTIGBAC-UHFFFAOYSA-K 0.000 claims description 5
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 claims description 5
- 229910052939 potassium sulfate Inorganic materials 0.000 claims description 5
- 235000011151 potassium sulphates Nutrition 0.000 claims description 5
- 239000007921 spray Substances 0.000 claims description 4
- 230000003197 catalytic effect Effects 0.000 abstract description 3
- 239000000126 substance Substances 0.000 description 4
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 229910017604 nitric acid Inorganic materials 0.000 description 3
- 238000005422 blasting Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 239000003905 agrochemical Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
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- Fertilizers (AREA)
Abstract
The invention discloses a method for preventing burning explosion of ammonium nitrate in a nitrate-sulfur-based compound fertilizer tower granulation production process. According to the method, an over-temperature alarm interlock protection system is arranged on a device for preventing burning explosion of ammonium nitrate in the nitrate-sulfur-based compound fertilizer tower granulation production process to perform real-time temperature monitoring on all reactors on a production line, and the material addition sequence is changed to shorten the contact time of potassium chloride and ammonium nitrate. By means of the method, the catalytic action of potassium chloride on ammonium nitrate is reduced, the probability of burning explosion is lowered, and the safety of the nitrate-sulfur-based compound fertilizer tower granulation production process is improved.
Description
Technical Field
The invention belongs to the technical field of safety of a high-tower granulation process for producing a nitro-sulfur-based compound fertilizer, and particularly relates to a method for preventing ammonium nitrate from burning explosion in the high-tower granulation process for producing the nitro-sulfur-based compound fertilizer.
Background
The main raw material in the process of producing the nitro-sulfur-based compound fertilizer by high tower melting granulation is ammonium nitrate, which is a substance with wide application, not only can be used as an important raw material of an agricultural chemical fertilizer, but also is a strong oxidant and a self-reactive substance. Ammonium nitrate is stable at normal temperature, but with the increase of temperature and the action of certain impurities, the physical and chemical properties of the ammonium nitrate can be seriously influenced or changed, so that the system is unstable and even causes explosion. In recent years, the serious explosion accident of ammonium nitrate shows that the ammonium nitrate is a typical dangerous substance which has low accident probability in theory and frequently occurs accidents in practice.
In the process of producing the nitro-sulfur-based compound fertilizer by high tower melting granulation, ammonium nitrate is always in a molten state and is in a high-temperature environment before a granulation high tower is cooled. In addition, potassium chloride added in the nitro-sulfur-based compound fertilizer has a catalytic effect on the decomposition of ammonium nitrate, so that the stability of the mixed material is poorer, and at the moment, the ammonium nitrate is more easily decomposed to generate a blasting accident. Similar accidents occur in China, at present, more than one hundred high-tower melting granulation devices are arranged in China, most of the high-tower melting granulation devices are not subjected to detailed safety design, and great potential safety hazards are brought to construction sites and construction personnel.
Disclosure of Invention
The invention provides a method for preventing ammonium nitrate from burning and exploding in a process of producing a nitro-sulfur-based compound fertilizer by high tower granulation, which can improve the safety in order to avoid the defects of the prior art.
The technical scheme adopted by the invention is as follows:
a device for preventing ammonium nitrate from burning explosion in a high-tower granulation production process of a nitro-sulfur-based compound fertilizer comprises an overtemperature alarm interlocking protection system, a belt feeder, a middle tank, a melter, a first mixing tank, a second mixing tank and a granulator which are sequentially connected, wherein ammonium nitrate is sequentially fed into the middle tank, the melter, the first mixing tank, the second mixing tank and the granulator; the overtemperature alarm interlocking protection system comprises a controller, a first temperature sensor arranged on the middle tank, a second temperature sensor arranged on the melting device, a third temperature sensor arranged on the first mixing tank and a fourth temperature sensor arranged on the second mixing tank; in the production process, monoammonium phosphate and monopotassium phosphate need to be put into the first mixing tank, potassium sulfate and potassium chloride need to be put into the second mixing tank, and the first temperature sensor, the second temperature sensor, the third temperature sensor, the fourth temperature sensor and the belt feeder are all in communication connection with the controller.
The device for preventing ammonium nitrate from burning and exploding in the process of producing the nitro-sulfur-based compound fertilizer by high tower granulation further comprises a heating steam supply part, wherein the intermediate tank, the melter, the first mixing tank and the second mixing tank are respectively connected with the heating steam supply part through heating steam conveying pipelines, and each heating steam conveying pipeline is provided with a heating steam valve.
The device for preventing ammonium nitrate from burning and exploding in the process of producing the nitro-sulfur-based compound fertilizer by high tower granulation further comprises a water supply part, wherein the intermediate tank, the melter, the first mixing tank, the second mixing tank and the granulator are respectively connected with the water supply part through water supply pipelines, and water supply valves are arranged on the water supply pipelines.
And a uniform mixer is arranged between the second mixing tank and the granulator.
The middle tank and the melting device, and the melting device and the first mixing tank are connected through ammonium nitrate conveying pipelines, a first ammonium nitrate feeding pump is arranged at the feeding end of the middle tank, a second ammonium nitrate feeding pump is arranged on the ammonium nitrate conveying pipeline between the middle tank and the melting device, and an ammonium nitrate solution feeding valve is arranged on the ammonium nitrate conveying pipeline between the melting device and the first mixing tank; a mixing tank and No. two mixing tanks, No. two mixing tanks and all blender, all blender and granulator all link to each other through mixed material conveying line, are provided with first mixed material feed valve on the mixed material conveying line between a mixing tank and No. two mixing tanks, are provided with second mixed material feed valve on the mixed material conveying line between No. two mixing tanks and all blender, are provided with third mixed material feed valve on the mixed material conveying line between all blender and the granulator.
And the middle tank, the melting device, the first mixing tank, the second mixing tank and the homogenizing mixer are all provided with discharge valves.
The feed end of the melting device is also provided with a first raw material feed valve, the feed end of the first mixing tank is also provided with a second raw material feed valve, and the feed end of the second mixing tank is also provided with a third raw material feed valve.
The invention also discloses a method for preventing ammonium nitrate from burning explosion in the process of producing the nitro-sulfur-based compound fertilizer by high tower granulation, which comprises the following steps:
step 1: designing a device for preventing ammonium nitrate from being exploded, wherein the device comprises an overtemperature alarm interlocking protection system, a belt feeder, a heating steam supply part, a water supply part, and a middle tank, a melter, a first mixing tank, a second mixing tank, a homogenizer and a granulator which are sequentially connected, wherein ammonium nitrate is sequentially fed into the middle tank, the melter, the first mixing tank, the second mixing tank, the homogenizer and the granulator;
the intermediate tank, the melting device, the first mixing tank and the second mixing tank are respectively connected with a heating steam supply part through heating steam conveying pipelines, and each heating steam conveying pipeline is provided with a heating steam valve; the middle tank, the melting device, the first mixing tank, the second mixing tank and the granulating machine are respectively connected with a water supply part through water supply pipelines, and each water supply pipeline is provided with a water supply valve;
the middle tank and the melting device, the melting device and the first mixing tank are connected through ammonium nitrate conveying pipelines, a first ammonium nitrate feeding pump is arranged at the feeding end of the middle tank, a second ammonium nitrate feeding pump is arranged on the ammonium nitrate conveying pipeline between the middle tank and the melting device, and an ammonium nitrate solution feeding valve is arranged on the ammonium nitrate conveying pipeline between the melting device and the first mixing tank; the first mixing tank and the second mixing tank, the second mixing tank and the homogenizer, and the homogenizer and the granulator are connected through a mixed material conveying pipeline, a first mixed material feeding valve is arranged on the mixed material conveying pipeline between the first mixing tank and the second mixing tank, and a second mixed material feeding valve is arranged on the mixed material conveying pipeline between the second mixing tank and the homogenizer; a third mixed material feeding valve is arranged on a mixed material conveying pipeline between the homogenizer and the granulator; the middle tank, the melting device, the first mixing tank, the second mixing tank and the homogenizing device are all provided with discharge valves; a first raw material feeding valve is arranged at the feeding end of the melting device, a second raw material feeding valve is arranged at the feeding end of the first mixing tank, and a third raw material feeding valve is arranged at the feeding end of the second mixing tank;
the overtemperature alarm interlocking protection system comprises a controller, a first temperature sensor arranged on a middle tank, a second temperature sensor arranged on a melting device, a third temperature sensor arranged on a first mixing tank and a fourth temperature sensor arranged on a second mixing tank, wherein the first, second, third and fourth temperature sensors and a belt feeder are respectively in communication connection with the controller, and alarm temperature values of the middle tank, the melting device, the first mixing tank and the second mixing tank are respectively arranged in the controller;
step 2: putting monoammonium phosphate and monopotassium phosphate into a first mixing tank through a belt feeder, and putting potassium sulfate and potassium chloride into a second mixing tank;
and step 3: monitoring the temperature in the middle tank in real time by using a first temperature sensor and transmitting the acquired temperature value to a controller in real time, monitoring the temperature in the melter in real time by using a second temperature sensor and transmitting the acquired temperature value to the controller in real time, monitoring the temperature in the first mixing tank in real time by using a third temperature sensor and transmitting the acquired temperature value to the controller in real time, monitoring the temperature in the second mixing tank in real time by using a fourth temperature sensor and transmitting the acquired value to the controller in real time; when the temperature in the intermediate tank, the melting device, the first mixing tank and the second mixing tank exceeds a set value, the controller sends out a control command.
In the step 1, the alarm temperature value in the intermediate tank is 180 ℃.
In the step 1, the alarm temperature value in the melting device is 175 ℃.
In the step 1, the alarm temperature values in the first mixing tank and the second mixing tank are all 175 ℃.
In the step 3, when the temperature in the middle tank reaches 190 ℃, the controller controls to close the first ammonium nitrate feeding pump, the heating steam valve on the heating steam conveying pipeline between the middle tank and the heating steam valve supply part, and simultaneously controls to open the discharge valve of the middle tank and the water supply valve on the water supply pipeline between the middle tank and the water supply part.
In the step 3, when the temperature in the melter reaches 185 ℃, the controller controls to close the second ammonium nitrate feeding pump and the heating steam valve on the heating steam conveying pipeline between the melter and the heating steam valve supply part, and simultaneously controls to open the discharge valve of the melter and the water supply valve on the water supply pipeline between the melter and the water supply part.
In the step 3, when the temperature in the first mixing tank and the second mixing tank reaches 185 ℃, the controller controls to close the melting device and the ammonium nitrate solution feeding valve and controls the belt feeder to stop feeding, and simultaneously controls to close the heating steam valve on the heating steam conveying pipeline between the first mixing tank and the heating steam valve supply part and the heating steam valve on the heating steam conveying pipeline between the second mixing tank and the heating steam valve supply part, and simultaneously controls to open the water feeding valve on the water feeding pipeline between the first mixing tank and the second mixing tank and the water feeding part.
In the process of stopping to overhaul or replacing the spray head of the granulator, the residence time of ammonium nitrate in the middle tank and the melter and the residence time of mixed materials in the first mixing tank and the second mixing tank need to be strictly controlled, and the specific time control is as follows: the residence time of ammonium nitrate in the intermediate tank is less than 2.5 hours, the residence time of ammonium nitrate in the melter is less than 1.5 hours, and the residence time of the mixed materials in the first mixing tank and the second mixing tank is less than 1 hour.
Due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the invention reduces the contact time of potassium chloride and ammonium nitrate in the process of producing the nitric acid-based compound fertilizer by high tower granulation, and reduces the catalytic action of potassium chloride on the decomposition of ammonium nitrate.
2. The invention sets high temperature alarm and linkage of each part, and reduces the thermal runaway danger of the whole process.
3. The invention sets the maximum retention time of each material in each reaction container, and provides method guidance for stopping, overhauling and changing the working conditions of the granulating spray head in the process of producing the nitric acid-based compound fertilizer by high tower granulation.
4. The invention increases the safety of the high tower granulation process for producing the nitric acid-based compound fertilizer, and can be applied to various domestic devices.
Drawings
Fig. 1 is a partial structural schematic diagram of an ammonium nitrate blasting device in the process of producing a nitro-sulfur-based compound fertilizer by high tower granulation.
Wherein,
1. a first ammonium nitrate feed pump 2, a water feed valve 3, a heating steam valve 4, a discharge valve 5, a second ammonium nitrate feed pump 6, a first raw material feed valve 7, a first temperature sensor 8, an intermediate tank 9, a second temperature sensor 10, an ammonium nitrate solution feed valve 11, a second raw material feed valve 12, a third temperature sensor 13, a first mixing tank 14, a second mixing tank 15, a first mixed material feed valve 16, a fourth temperature sensor 17, a third raw material feed valve 18, a homomixer 19, a second mixed material feed valve 20, a granulator 21, a melter 22, and a third mixed material feed valve
Detailed Description
The present invention will be described in further detail with reference to the following drawings and specific examples, but the present invention is not limited to these examples.
As shown in fig. 1, the device for preventing ammonium nitrate from exploding in the process of producing nitrate-sulfur-based compound fertilizer by high tower granulation comprises an overtemperature alarm interlocking protection system, a heating steam supply part, a water supply part, a belt feeder, a middle tank 8, a melter 21, a first mixing tank 13, a second mixing tank 14, a homogenizer 18 and a granulator 20 which are sequentially connected, wherein ammonium nitrate is sequentially fed into the middle tank 8, the melter 21, the first mixing tank 13, the second mixing tank 14 and the granulator 20.
The middle tank 8, the melting device 21, the first mixing tank 13 and the second mixing tank 14 are respectively connected with a heating steam supply part through heating steam conveying pipelines, and each heating steam conveying pipeline is provided with a heating steam valve 3; the middle tank 8, the melting device 21, the first mixing tank 13, the second mixing tank 14 and the granulator 20 are respectively connected with a water supply part through water supply pipelines, and each water supply pipeline is provided with a water supply valve 2; the middle tank 8 and the melting device 21, and the melting device 21 and the first mixing tank 13 are connected through ammonium nitrate conveying pipelines, a first ammonium nitrate feeding pump 1 is arranged at the feeding end of the middle tank 8, a second ammonium nitrate feeding pump 5 is arranged on the ammonium nitrate conveying pipeline between the middle tank 8 and the melting device 21, and an ammonium nitrate solution feeding valve 10 is arranged on the ammonium nitrate conveying pipeline between the melting device 21 and the first mixing tank 13; the first mixing tank 13 and the second mixing tank 14, the second mixing tank 14 and the homogenizer 18, and the homogenizer 18 and the granulator 20 are all connected through a mixed material conveying pipeline, a first mixed material feeding valve 15 is arranged on the mixed material conveying pipeline between the first mixing tank 13 and the second mixing tank 14, a second mixed material feeding valve 19 is arranged on the mixed material conveying pipeline between the second mixing tank 14 and the homogenizer 18, and a third mixed material feeding valve 22 is arranged on the mixed material conveying pipeline between the homogenizer 18 and the granulator 20; the intermediate tank 8, the melting device 21, the first mixing tank 13, the second mixing tank 14 and the homogenizing mixer 18 are all provided with discharge valves 4; the feed end of the melting device 21 is also provided with a first raw material feed valve 6, the feed end of the first mixing tank 13 is also provided with a second raw material feed valve 11, and the feed end of the second mixing tank 14 is also provided with a third raw material feed valve 17. The overtemperature alarm interlocking protection system comprises a controller, a first temperature sensor 7 arranged on an intermediate tank 8, a second temperature sensor 9 arranged on a melting device 21, a third temperature sensor 12 arranged on a first mixing tank 13 and a fourth temperature sensor 16 arranged on a second mixing tank 14; monoammonium phosphate and monopotassium phosphate are contained in the first mixing tank 13, potassium sulfate and potassium chloride are contained in the second mixing tank 14, and the first temperature sensor, the second temperature sensor, the third temperature sensor, the fourth temperature sensor and the belt feeder are all in communication connection with the controller.
The invention also discloses a method for preventing ammonium nitrate from burning explosion in the process of producing the nitro-sulfur-based compound fertilizer by high tower granulation, which comprises the following steps:
step 1: the device for preventing ammonium nitrate from being exploded is designed, as shown in figure 1, the device comprises an overtemperature alarm interlocking protection system, a belt feeder, a heating steam supply part, a water supply part, and a middle tank 8, a melter 21, a first mixing tank 13, a second mixing tank 14, a homomixer 18 and a granulator 20 which are sequentially connected, wherein ammonium nitrate is sequentially fed into the middle tank 8, the melter 21, the first mixing tank 13, the second mixing tank 14, the homomixer 18 and the granulator 20;
the middle tank 8, the melting device 21, the first mixing tank 13 and the second mixing tank 14 are respectively connected with a heating steam supply part through heating steam conveying pipelines, and each heating steam conveying pipeline is provided with a heating steam valve 3; the middle tank 8, the melting device 21, the first mixing tank 13, the second mixing tank 14 and the granulator 20 are respectively connected with a water supply part through water supply pipelines, and each water supply pipeline is provided with a water supply valve 2;
the middle tank 8 and the melter 21, and the melter 21 and the first mixing tank 13 are connected through ammonium nitrate conveying pipelines, a first ammonium nitrate feeding pump 1 is arranged at the feeding end of the middle tank 8, a second ammonium nitrate feeding pump 5 is arranged on the ammonium nitrate conveying pipeline between the middle tank 8 and the melter 21, and an ammonium nitrate solution feeding valve 10 is arranged on the ammonium nitrate conveying pipeline between the melter 21 and the first mixing tank 13; the first mixing tank 13 and the second mixing tank 14, the second mixing tank 14 and the homogenizer 18, and the homogenizer 18 and the granulator 20 are connected through a mixed material conveying pipeline, a first mixed material feeding valve 15 is arranged on the mixed material conveying pipeline between the first mixing tank 13 and the second mixing tank 14, and a second mixed material feeding valve 19 is arranged on the mixed material conveying pipeline between the second mixing tank 14 and the homogenizer 18; a third mixed material feeding valve 22 is arranged on the mixed material conveying pipeline between the homogenizer 18 and the granulator 20; the intermediate tank 8, the melting device 21, the first mixing tank 13, the second mixing tank 14 and the homogenizer 18 are all provided with discharge valves 4; a first raw material feeding valve 6 is arranged at the feeding end of a melting device 21, a second raw material feeding valve 11 is arranged at the feeding end of a first mixing tank 13, and a third raw material feeding valve 17 is arranged at the feeding end of a second mixing tank 14;
overtemperature alarm interlocking protection system needs to include the controller, set up first temperature sensor 7 on middle groove 8, set up second temperature sensor 9 on melter 21, set up third temperature sensor 12 on a mixing tank 13 and set up fourth temperature sensor 16 on No. two mixing tanks 14, it is first, the second, the third, fourth temperature sensor and belt feeder carry out the communication connection with the controller respectively, simultaneously set up middle groove 8 in the controller respectively, melter 21, a mixing tank 13, the alarm temperature value of No. two mixing tanks 14, specifically do: the alarm temperature value in the middle tank 8 is 180 ℃, the alarm temperature value in the melter 21 is 175 ℃, and the alarm temperature values in the first mixing tank and the second mixing tank are both 175 ℃;
step 2: monoammonium phosphate and monopotassium phosphate are put into the first mixing tank 13 through a belt feeder, and potassium sulfate and potassium chloride are put into the second mixing tank 14;
and step 3: monitoring the temperature in the middle tank 8 in real time by using a first temperature sensor 7 and transmitting the acquired temperature value to a controller in real time, wherein when the temperature in the middle tank 8 reaches 190 ℃, the controller controls to close the first ammonium nitrate feeding pump 1, the heating steam valve 3 on a heating steam conveying pipeline between the middle tank 8 and a heating steam valve supply part, and simultaneously controls to open the discharge valve 4 of the middle tank 8 and the water feed valve 2 on a water feed pipeline between the middle tank 8 and the water feed part; monitoring the temperature in the melter 21 in real time by using a second temperature sensor 9 and transmitting the acquired temperature value to a controller in real time, when the temperature in the melter 21 reaches 185 ℃, the controller controls to close a second ammonium nitrate feeding pump 5, a heating steam valve 3 on a heating steam conveying pipeline between the melter 21 and a heating steam valve supply part, and simultaneously controls to open a discharge valve 4 of the melter 21 and a water supply valve 2 on a water supply pipeline between the melter 21 and the water supply part; the temperature in the first mixing tank 13 is monitored in real time by a third temperature sensor 12, the collected temperature value is transmitted to the controller in real time, and the temperature in the second mixing tank 14 is monitored in real time by a fourth temperature sensor 16, and the collected value is transmitted to the controller in real time; when the temperature in the first mixing tank and the second mixing tank reaches 185 ℃, the controller controls the melting device 21 and the ammonium nitrate solution feeding valve 10 to be closed, controls the belt feeder to stop feeding, controls the heating steam valve 3 on the heating steam conveying pipeline between the first mixing tank 13 and the heating steam valve supply part to be closed, controls the heating steam valve 3 on the heating steam conveying pipeline between the second mixing tank 14 and the heating steam valve supply part to be closed, and controls the water feeding valve 2 on the water feeding pipeline between the first mixing tank and the water feeding part to be opened at the same time.
In the process of stopping to overhaul or replacing the spray head of the granulator, the residence time of ammonium nitrate in the intermediate tank 8 and the melter 21 and the residence time of the mixed materials in the first mixing tank 13 and the second mixing tank 14 need to be strictly controlled, and the specific time is controlled as follows: the residence time of the ammonium nitrate in the middle tank 8 is less than 2.5 hours, the residence time of the ammonium nitrate in the melter 21 is less than 1.5 hours, and the residence time of the mixed materials in the first mixing tank and the second mixing tank is less than 1 hour.
Parts which are not described in the invention can be realized by adopting or referring to the prior art.
Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (8)
1. A method for preventing ammonium nitrate from burning explosion in a process of producing a nitro-sulfur-based compound fertilizer by high tower granulation is characterized by comprising the following steps:
step 1: designing a device for preventing ammonium nitrate from being exploded, wherein the device comprises an overtemperature alarm interlocking protection system, a belt feeder, a heating steam supply part, a water supply part, and a middle tank, a melter, a first mixing tank, a second mixing tank, a homogenizer and a granulator which are sequentially connected, wherein ammonium nitrate is sequentially fed into the middle tank, the melter, the first mixing tank, the second mixing tank, the homogenizer and the granulator;
the intermediate tank, the melting device, the first mixing tank and the second mixing tank are respectively connected with a heating steam supply part through heating steam conveying pipelines, and each heating steam conveying pipeline is provided with a heating steam valve; the middle tank, the melting device, the first mixing tank, the second mixing tank and the granulating machine are respectively connected with a water supply part through water supply pipelines, and each water supply pipeline is provided with a water supply valve;
the middle tank and the melting device, the melting device and the first mixing tank are connected through ammonium nitrate conveying pipelines, a first ammonium nitrate feeding pump is arranged at the feeding end of the middle tank, a second ammonium nitrate feeding pump is arranged on the ammonium nitrate conveying pipeline between the middle tank and the melting device, and an ammonium nitrate solution feeding valve is arranged on the ammonium nitrate conveying pipeline between the melting device and the first mixing tank; the first mixing tank and the second mixing tank, the second mixing tank and the homogenizer, and the homogenizer and the granulator are connected through a mixed material conveying pipeline, a first mixed material feeding valve is arranged on the mixed material conveying pipeline between the first mixing tank and the second mixing tank, and a second mixed material feeding valve is arranged on the mixed material conveying pipeline between the second mixing tank and the homogenizer; a third mixed material feeding valve is arranged on a mixed material conveying pipeline between the homogenizer and the granulator; the middle tank, the melting device, the first mixing tank, the second mixing tank and the homogenizing device are all provided with discharge valves; a first raw material feeding valve is arranged at the feeding end of the melting device, a second raw material feeding valve is arranged at the feeding end of the first mixing tank, and a third raw material feeding valve is arranged at the feeding end of the second mixing tank;
the overtemperature alarm interlocking protection system comprises a controller, a first temperature sensor arranged on a middle tank, a second temperature sensor arranged on a melting device, a third temperature sensor arranged on a first mixing tank and a fourth temperature sensor arranged on a second mixing tank, wherein the first, second, third and fourth temperature sensors and a belt feeder are respectively in communication connection with the controller, and alarm temperature values of the middle tank, the melting device, the first mixing tank and the second mixing tank are respectively arranged in the controller;
step 2: putting monoammonium phosphate and monopotassium phosphate into a first mixing tank through a belt feeder, and putting potassium sulfate and potassium chloride into a second mixing tank;
and step 3: monitoring the temperature in the middle tank in real time by using a first temperature sensor and transmitting the acquired temperature value to a controller in real time, monitoring the temperature in the melter in real time by using a second temperature sensor and transmitting the acquired temperature value to the controller in real time, monitoring the temperature in the first mixing tank in real time by using a third temperature sensor and transmitting the acquired temperature value to the controller in real time, monitoring the temperature in the second mixing tank in real time by using a fourth temperature sensor and transmitting the acquired value to the controller in real time; when the temperature in the intermediate tank, the melting device, the first mixing tank and the second mixing tank exceeds a set value, the controller sends out a control command.
2. The method for preventing ammonium nitrate from burning explosion in the process of producing the nitro-sulfur-based compound fertilizer by high tower granulation according to claim 1, wherein in the step 1, the alarm temperature value in the intermediate tank is 180 ℃.
3. The method for preventing ammonium nitrate from burning explosion in the process of producing the nitro-sulfur-based compound fertilizer by high tower granulation as claimed in claim 1, wherein the alarm temperature value in the melter in the step 1 is 175 ℃.
4. The method for preventing ammonium nitrate from burning explosion in the process of producing the nitro-sulfur-based compound fertilizer by high tower granulation as claimed in claim 1, wherein the alarm temperature values in the first mixing tank and the second mixing tank are both 175 ℃.
5. The method for preventing ammonium nitrate from burning and exploding in the process of producing the nitro-sulfur-based compound fertilizer by high tower granulation as claimed in claim 1 or 2, wherein in the step 3, when the temperature in the intermediate tank reaches 190 ℃, the controller controls to close the first ammonium nitrate feeding pump, the heating steam valve on the heating steam conveying pipeline between the intermediate tank and the heating steam valve supply part, and simultaneously the controller controls to open the discharge valve of the intermediate tank and the water supply valve on the water supply pipeline between the intermediate tank and the water supply part.
6. The method for preventing ammonium nitrate from exploding in the process of producing nitro-sulfur-based compound fertilizer by high tower granulation as claimed in claim 1 or 3, wherein in step 3, when the temperature in the melter reaches 185 ℃, the controller controls to close the second ammonium nitrate feed pump, the heating steam valve on the heating steam delivery pipeline between the melter and the heating steam valve supply part, and simultaneously the controller controls to open the discharge valve of the melter and the water supply valve on the water supply pipeline between the melter and the water supply part.
7. The method for preventing ammonium nitrate from exploding in the process of producing nitro-sulfur-based compound fertilizer by high tower granulation as claimed in claim 1 or 4, wherein in step 3, when the temperature in the first and second mixing tanks reaches 185 ℃, the controller controls to close the melter and the ammonium nitrate solution feed valve and controls the belt feeder to stop feeding, and at the same time, the controller controls to close the heating steam valve on the heating steam conveying pipeline between the first mixing tank and the heating steam valve supply part and the heating steam valve on the heating steam conveying pipeline between the second mixing tank and the heating steam valve supply part, and the controller also controls to open the water feeding valve on the water feeding pipeline between the first and second mixing tanks and the water feeding part.
8. The method for preventing ammonium nitrate from burning and exploding in the process of producing the nitro-sulfur-based compound fertilizer by high tower granulation as claimed in claim 1, wherein the residence time of ammonium nitrate in the intermediate tank and the melter and the residence time of the mixed materials in the first mixing tank and the second mixing tank are strictly controlled in the process of stopping, overhauling or replacing the spray head of the granulator, and the specific time is controlled as follows: the residence time of ammonium nitrate in the intermediate tank is less than 2.5 hours, the residence time of ammonium nitrate in the melter is less than 1.5 hours, and the residence time of the mixed materials in the first mixing tank and the second mixing tank is less than 1 hour.
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