CN106083752B - Hot gas cooler cleaning device based on melamine production - Google Patents
Hot gas cooler cleaning device based on melamine production Download PDFInfo
- Publication number
- CN106083752B CN106083752B CN201610403424.1A CN201610403424A CN106083752B CN 106083752 B CN106083752 B CN 106083752B CN 201610403424 A CN201610403424 A CN 201610403424A CN 106083752 B CN106083752 B CN 106083752B
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- China
- Prior art keywords
- hot gas
- gas cooler
- cleaning device
- wear
- melamine
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D251/00—Heterocyclic compounds containing 1,3,5-triazine rings
- C07D251/02—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings
- C07D251/12—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members
- C07D251/26—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members with only hetero atoms directly attached to ring carbon atoms
- C07D251/40—Nitrogen atoms
- C07D251/54—Three nitrogen atoms
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G3/00—Rotary appliances
- F28G3/16—Rotary appliances using jets of fluid for removing debris
- F28G3/163—Rotary appliances using jets of fluid for removing debris from internal surfaces of heat exchange conduits
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Catalysts (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention belongs to the technical field of melamine production, and relates to a hot gas cooling and cleaning device based on melamine production. The hot gas cooler cleaning device comprises a pressure material tank, a carrier gas compressor and an airflow pipeline, wherein the state wear-resistant particles flow out from the pressure material pipeline and flow into the heat exchange pipe of the cooler in parallel with the high-temperature process material gas, wall crystals on the inner wall of the heat exchange pipe are removed through the wear-resistant particles, the problem that the device is stopped due to blockage of the heat exchange pipe of the hot gas cooler is thoroughly solved, meanwhile, the trouble of cleaning the device is avoided, and the continuous operation period of the melamine device is greatly prolonged.
Description
Technical Field
The invention belongs to the technical field of melamine production, and relates to a hot gas cooling and cleaning device based on melamine production.
Background
At present, the melamine production process in China is mainly a Qingdahua industry atmospheric method, and the process is as follows: the molten urea is pumped to the inlet of the reactor by a urine pump, atomized under the action of a nozzle and enters the reactor, and reacts under the action of a catalyst at 380-390 ℃ and under the pressure of less than 0.45MPa to generate gaseous melamine, ammonia and carbon dioxide high-temperature mixed gas. The heat required for the reaction is provided by the molten salt system. And (3) the process material gas enters a hot gas cooler after the reaction, exchanges heat with the crude liquid in the cooler, and is cooled to 330 ℃, so that the high-boiling-point byproducts melem and melamino generated by the reaction are crystallized and separated out, the catalyst powder and the byproducts in the gas flow are separated by a cyclone separator and then most of the catalyst powder and the byproducts are removed, and then the catalyst powder and the byproducts enter a hot gas filter to filter a small amount of solid impurities in the gas. And dust-free gas from the filter enters from the top of the crystallizer, reversely contacts and is quenched with the circulating gas of the 135-plus-145 ℃ cold process from the liquid-urine washing system, the temperature of the dust-free gas is reduced to 210 ℃, melamine crystals are separated out and enter the finished product cyclone collector along with the mixed gas, the melamine is gathered at the bottom of the cyclone collector and is sent out of the separator by a scraper and a pressure screw, the melamine is cooled by air flow of a blower and is conveyed to a finished product bin, and the finished product is packaged to obtain a melamine finished product. The process has low energy consumption, but the hot gas cooler is easy to form walls and block, the operation period is only about 2 months, and the formed walls are difficult to clean.
Patent CN104277006A discloses a method for switching hot gas coolers in melamine production on line, that is, two sets of hot gas coolers are arranged at the outlet of the reactor, and the two sets of hot gas coolers are switched to be used, so that the operation period of the melamine production is increased. However, the two sets of hot gas coolers are switched to be used, so that the equipment investment cost is increased, and the problem that the wall is difficult to clean still exists.
Disclosure of Invention
The invention provides the hot gas cooler cleaning device for melamine production, which is low in cost and capable of achieving long-period stable operation, and aims to solve the problems that the production operation period is short due to the fact that the wall of the hot gas cooler heat exchange tube is blocked and the pipeline of the hot gas cooler is difficult to clean after the wall is formed.
The utility model provides a hot gas cooler cleaning device based on melamine production, includes pressure tank, carrier gas compressor and air flow pipeline, and the pressure tank is located hot gas cooler's entry, and the pressure tank inserts hot gas cooler through the air flow pipeline who connects the carrier gas compressor.
Further, the top of the material pressing tank is provided with an emptying valve, a wear-resistant particle feeding hole and a connector connected with an ammonia gas charging bottle, and the bottom of the material pressing tank is provided with a discharging hole.
Further, the material pressing tank is sealed, and sealing valves are arranged at the wear-resistant particle feeding hole, the connector connected with the ammonia gas charging bottle and the discharging hole.
The device thoroughly solves the problem of device shutdown caused by blockage of the heat exchange tube of the hot gas cooler, simultaneously avoids the trouble of device cleaning, and greatly prolongs the continuous operation period of the melamine production device.
Drawings
Fig. 1 is a schematic view of a hot gas cooler cleaning plant based on melamine production.
Detailed Description
Embodiments of the present invention are further described with reference to the accompanying drawings:
as shown in FIG. 1, in the heat exchange pipeline of the hot gas cooler, as the process material gas enters after the reaction, heat exchange is performed in the cooler, the temperature is reduced to 320-330 ℃, so that the high-boiling-point byproducts melem and melamino generated by the reaction are crystallized and separated out, and at the moment, part of the byproduct crystals can be attached to the inner wall of the heat exchange pipeline of the hot gas cooler.
When the pressure difference of the hot gas cooler cleaning device is higher than the specified range, the wear-resistant particle feeding port 6 is opened, the wear-resistant particle quartz is added into the buffer tank, and a certain amount of wear-resistant particle quartz is blown into the material pressing tank 1 by 0.03MPa-0.2MPa air from the Roots blower. And (3) closing the wear-resistant particle feeding hole 6 at the top of the material pressing tank, and closing the emptying valve after air is replaced by ammonia gas. Pressurizing the material pressing tank to 0.6-1MPa by adopting ammonia gas, opening a discharge hole at the bottom of the material pressing tank, bringing wear-resistant particles into a hot gas inlet of a hot gas cooler 4 by using a compressor carrier gas (a mixed gas of carbon dioxide and ammonia gas) of 0.3-0.5MPa, enabling the wear-resistant particles to flow into a heat exchange tube of the hot gas cooler in parallel with high-temperature process material gas, and breaking wall-bonding solids by using fluidized wear-resistant particle quartz and bringing the wall-bonding solids out of the hot gas cooler. The catalyst, the wear resistant particulate quartz and by-products in the gas stream are separated by a subsequent cyclone and hot gas filter.
And after the pressure difference of the hot gas cooler system recovers to the specified range, closing the discharge hole of the pressure charging tank, the ammonia inlet and the compressor air valve, opening the vent valve, and performing the next period after pressure relief.
Claims (1)
1. A hot gas cooler cleaning device based on melamine production is characterized by comprising a pressure tank (1), a carrier gas compressor (2) and an airflow pipeline (3), wherein the pressure tank is positioned at an inlet of a hot gas cooler (4), and is connected to the hot gas cooler through the airflow pipeline connected with the carrier gas compressor; the top of the material pressing tank is provided with an emptying valve (5), a wear-resistant particle feeding port (6) and a connector (7) connected with an ammonia gas charging bottle, and the bottom of the material pressing tank is provided with a discharging port; the material pressing tank is sealed, and sealing valves are arranged at the wear-resistant particle feeding port, the connector connected with the ammonia gas charging bottle and the discharging port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610403424.1A CN106083752B (en) | 2016-06-12 | 2016-06-12 | Hot gas cooler cleaning device based on melamine production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610403424.1A CN106083752B (en) | 2016-06-12 | 2016-06-12 | Hot gas cooler cleaning device based on melamine production |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106083752A CN106083752A (en) | 2016-11-09 |
| CN106083752B true CN106083752B (en) | 2020-04-21 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610403424.1A Active CN106083752B (en) | 2016-06-12 | 2016-06-12 | Hot gas cooler cleaning device based on melamine production |
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| Country | Link |
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| CN (1) | CN106083752B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101845022A (en) * | 2009-03-25 | 2010-09-29 | 丁泽华 | Equipment for crystallizing melamine and by-product thereof by cooling |
| CN101863848A (en) * | 2010-05-28 | 2010-10-20 | 北京烨晶科技有限公司 | System and method for preparing melamine |
| CN104277006A (en) * | 2014-10-30 | 2015-01-14 | 安徽金禾实业股份有限公司 | Method for switching hot gas coolers on line in melamine production |
| CN105503758A (en) * | 2016-01-18 | 2016-04-20 | 尹明大 | Melamine production system and technique |
-
2016
- 2016-06-12 CN CN201610403424.1A patent/CN106083752B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101845022A (en) * | 2009-03-25 | 2010-09-29 | 丁泽华 | Equipment for crystallizing melamine and by-product thereof by cooling |
| CN101863848A (en) * | 2010-05-28 | 2010-10-20 | 北京烨晶科技有限公司 | System and method for preparing melamine |
| CN104277006A (en) * | 2014-10-30 | 2015-01-14 | 安徽金禾实业股份有限公司 | Method for switching hot gas coolers on line in melamine production |
| CN105503758A (en) * | 2016-01-18 | 2016-04-20 | 尹明大 | Melamine production system and technique |
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| Publication number | Publication date |
|---|---|
| CN106083752A (en) | 2016-11-09 |
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| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: Hot gas cooler cleaning device based on melamine production Effective date of registration: 20211027 Granted publication date: 20200421 Pledgee: Linyi Yinan sub branch of Qilu Bank Co.,Ltd. Pledgor: SHANDONG SHUNTIAN CHEMICAL GROUP Co.,Ltd. Registration number: Y2021980011460 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20230926 Granted publication date: 20200421 Pledgee: Linyi Yinan sub branch of Qilu Bank Co.,Ltd. Pledgor: SHANDONG SHUNTIAN CHEMICAL GROUP Co.,Ltd. Registration number: Y2021980011460 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: A Hot Gas Cooler Cleaning Device Based on Melamine Production Effective date of registration: 20230928 Granted publication date: 20200421 Pledgee: Industrial and Commercial Bank of China Limited Yinan sub branch Pledgor: SHANDONG SHUNTIAN CHEMICAL GROUP Co.,Ltd. Registration number: Y2023980059807 |