CN111298613A - Urea solution atomizing spray gun - Google Patents
Urea solution atomizing spray gun Download PDFInfo
- Publication number
- CN111298613A CN111298613A CN202010127151.9A CN202010127151A CN111298613A CN 111298613 A CN111298613 A CN 111298613A CN 202010127151 A CN202010127151 A CN 202010127151A CN 111298613 A CN111298613 A CN 111298613A
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- Prior art keywords
- urea solution
- gun
- compressed air
- mixing chamber
- rotational flow
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/79—Injecting reactants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/02—Spray pistols; Apparatus for discharge
- B05B7/04—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge
- B05B7/0416—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/02—Spray pistols; Apparatus for discharge
- B05B7/04—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge
- B05B7/0416—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid
- B05B7/0441—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid with one inner conduit of liquid surrounded by an external conduit of gas upstream the mixing chamber
- B05B7/045—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid with one inner conduit of liquid surrounded by an external conduit of gas upstream the mixing chamber the gas and liquid flows being parallel just upstream the mixing chamber
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2067—Urea
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Nozzles (AREA)
Abstract
The invention provides a urea solution atomizing spray gun, comprising: the gun head is used for spraying urea solution; the gun barrel is in threaded connection with the gun head and is provided with a nozzle; the protective sleeve is welded on the gun barrel; the compressed air interface is welded on the protective sleeve and used for the entrance of compressed air; the urea solution interface is welded at the axial tail end of the gun barrel and used for the entry of urea solution; and the rotational flow mixing chamber is arranged at the end part of the gun barrel and is used for fully mixing gas-liquid two-phase flow and transferring energy, wherein the compressed air interface is communicated with the rotational flow mixing chamber, so that the compressed air enters the rotational flow mixing chamber, the urea solution tangentially enters the rotational flow mixing chamber of the gun body through the urea solution interface, and the compressed air and the urea solution are fully mixed in the rotational flow mixing chamber and transfer energy. The invention can fully exchange gas-liquid two-phase energy, has good atomization effect, high kinetic energy of the urea solution, can effectively spray the reducing agent to a preset position, and has higher denitration efficiency.
Description
Technical Field
The invention belongs to the technical field of SNCR (selective non-catalytic reduction) denitration of boilers, relates to a denitration spray gun of a coal-fired boiler, and particularly relates to a urea solution atomization spray gun.
Background
The flue gas of the boiler of the power plant contains nitrogen oxides (NOx), the NOx is a main atmospheric pollutant, the NOx and hydrocarbon can cause photochemical pollution under the action of strong light, and the NOx discharged into the atmosphere is a main cause for forming acid rain, thereby seriously harming the ecological environment. Selective non-catalytic reduction flue gas denitration (SNCR) is one of important flue gas denitration methods due to simple process and low investment. The principle is that under the action of compressed air, urea solution is atomized by a spray gun and then sprayed into high-temperature flue gas in a furnace, ammonia generated by pyrolysis of urea reacts with nitric oxide in the flue gas to generate nitrogen and water, and the nitric oxide in the flue gas is removed.
The atomized gas-liquid must have enough energy to be sprayed to a preset position, so that the denitration efficiency is ensured. At present, the conventional gas-liquid two-phase flow spray gun used for cleaning or cooling in other industries is mostly selected for domestic coal-fired boiler denitration spray guns, gas-liquid two-phase energy exchange is insufficient, the atomization effect is poor, the kinetic energy of a reducing agent is low, the reducing agent cannot be effectively sprayed to a preset position, the denitration efficiency is low, only about 50% of the reducing agent is generally used, and a special denitration spray gun suitable for the smoke working condition of the coal-fired boiler is urgently needed.
Disclosure of Invention
The present invention has been made to solve the above problems, and an object of the present invention is to provide a urea solution atomizing spray gun.
The invention provides a urea solution atomizing spray gun, which is characterized by comprising the following components: the gun head is used for spraying urea solution and is provided with a nozzle; the gun barrel is in threaded connection with the gun head; the protective sleeve is welded on the gun barrel; the compressed air interface is welded on the protective sleeve and used for the entrance of compressed air; the urea solution interface is welded at the axial tail end of the gun barrel and used for the entry of urea solution; and the rotational flow mixing chamber is arranged at the end part of the gun barrel and is used for fully mixing gas-liquid two-phase flow and transferring energy, wherein the compressed air interface is communicated with the rotational flow mixing chamber, so that the compressed air enters the rotational flow mixing chamber, the urea solution tangentially enters the rotational flow mixing chamber of the gun body through the urea solution interface, and the compressed air and the urea solution are fully mixed in the mixing chamber and transfer energy.
In the urea solution atomizing spray gun provided by the invention, the spraying gun can also have the following characteristics: wherein, mutually support through the inside internal thread of rifle head and the outside external screw thread of barrel between rifle head and the barrel, link together.
In the urea solution atomizing spray gun provided by the invention, the spraying gun can also have the following characteristics: wherein, the compressed air interface is internally provided with internal threads.
In the urea solution atomizing spray gun provided by the invention, the spraying gun can also have the following characteristics: wherein, the rotational flow mixing chamber is connected with the gun barrel through a set screw.
In the urea solution atomizing spray gun provided by the invention, the spraying gun can also have the following characteristics: wherein, the nozzle of the gun head is provided with an axial small hole for controlling the shape of the spray to be fan-shaped.
Action and Effect of the invention
According to the urea solution atomizing spray gun, the whole device can be protected from being damaged due to the protective sleeve; because of the compressed air interface, compressed air is able to enter the barrel; because of the urea solution interface, the urea solution can enter the gun barrel; the device is provided with the rotational flow mixing chamber, the rotational flow mixing chamber is communicated with the compressed air interface, and meanwhile, the urea solution enters the rotational flow mixing chamber of the gun body through the urea solution interface in a tangential direction, so that the compressed air and the urea solution are fully mixed in the rotational flow mixing chamber and are subjected to energy transfer, the pressure energy of a gas phase is fully utilized, and the kinetic energy of a liquid phase is improved.
Therefore, the urea solution atomizing spray gun can adapt to the working condition of the flue gas of the coal-fired boiler, the gas-liquid two-phase energy exchange is sufficient, the atomizing effect is good, the urea solution has high kinetic energy, the reducing agent can be effectively sprayed to a preset position, and the denitration efficiency is high.
Drawings
FIG. 1 is a schematic diagram of a urea solution atomizing spray gun according to an embodiment of the present invention;
FIG. 2 is a schematic view of the nozzle of a urea solution atomizing spray gun in an embodiment of the present invention.
Detailed Description
In order to make the technical means and functions of the present invention easy to understand, the present invention is specifically described below with reference to the embodiments and the accompanying drawings.
Example (b):
FIG. 1 is a schematic diagram of a urea solution atomizing spray gun according to an embodiment of the present invention.
As shown in fig. 1, a urea solution atomizing spray gun 100 of the present embodiment includes: gun head 10, gun barrel 20, protective sleeve 30, compressed air port 40, urea solution port 50 and cyclone mixing chamber 60.
FIG. 2 is a schematic view of the nozzle of a urea solution atomizing spray gun in an embodiment of the present invention.
As shown in fig. 2, the lance tip 10 is used for spraying urea solution and has a nozzle with an elliptical axial orifice for controlling the spray pattern in a fan shape.
The gun barrel 20 is in threaded connection with the gun head 10, that is, the gun head and the gun barrel are mutually matched and connected together through internal threads inside the gun head and external threads outside the gun barrel.
The compressed air interface 40 is welded on the protective sheath 30 and used for the inlet of compressed air, and an internal thread is arranged in the compressed air interface 40, so that the compressed air continuously entering through the protective sheath 30 can effectively cool the urea solution atomizing spray gun 100 working at high temperature.
The urea solution port 50 is welded to the axial end of the gun barrel 20 for the entry of urea solution, and the portion between the urea solution port 50 and the gun head 10 is communicated with the small tangential holes on the swirling mixing chamber 60.
The swirl mixing chamber 60 is arranged at the end of the gun tube 20, and the swirl mixing chamber 60 is connected with the gun tube 20 through a set screw for sufficient mixing and energy transfer of gas-liquid two-phase flow.
In this embodiment, the compressed air port 40 is communicated with the swirling flow mixing chamber 60, so that the compressed air enters the swirling flow mixing chamber 60, the urea solution tangentially enters the swirling flow mixing chamber 60 of the gun body through the urea solution port 50, the compressed air and the urea solution are fully mixed in the swirling flow mixing chamber 60, and energy is transferred, so that pressure energy of a gas phase is fully utilized, and kinetic energy of a liquid phase is improved.
FIG. 2 is a schematic view of the nozzle of a urea solution atomizing spray gun in an embodiment of the present invention.
The working process of the urea solution atomizing spray gun of the embodiment is as follows:
when the urea solution atomizing spray gun 100 of this embodiment works, compressed air and urea solution are respectively connected to the compressed air connector 40 and the urea solution connector 5. The urea solution with certain pressure axially enters the cyclone mixing chamber 60 through the urea solution connector 50, when the compressed air entering from the compressed air connector 50 encounters, gas and liquid phases are fully mixed, exchanged in energy and atomized in the cyclone mixing chamber 60, the liquid phase with certain pressure energy obtains gas phase pressure energy and simultaneously has kinetic energy rotating at high speed, the energy of the liquid phase is increased, and after the liquid phase is sprayed out through the gun head 10, the pressure energy and the kinetic energy of the liquid phase are all converted into the kinetic energy, so that conditions are provided for further atomization and spraying of the liquid phase to a preset position.
Effects and effects of the embodiments
According to the urea solution atomizing spray gun of the embodiment, the whole device can be protected from being damaged due to the protective sleeve; because of the compressed air interface, compressed air is able to enter the barrel; because of the urea solution interface, the urea solution can enter the gun barrel; the device is provided with the rotational flow mixing chamber, the rotational flow mixing chamber is communicated with the compressed air interface, and meanwhile, the urea solution enters the rotational flow mixing chamber of the gun body through the urea solution interface in a tangential direction, so that the compressed air and the urea solution are fully mixed in the rotational flow mixing chamber and are subjected to energy transfer, the pressure energy of a gas phase is fully utilized, and the kinetic energy of a liquid phase is improved.
According to the urea solution atomizing spray gun of the embodiment, the nozzle of the gun head is provided with the fan-shaped axial small hole for controlling the spray shape, so that the urea solution can be sprayed more intensively at the furnace body height at which the ideal SNCR denitration temperature is located.
Therefore, the urea solution atomizing spray gun of this embodiment can adapt to coal fired boiler flue gas operating mode, and the two-phase energy exchange of gas-liquid is abundant, and atomization effect is good, and the kinetic energy that urea solution has is high, can spout the reductant to preset position effectively, and denitration efficiency is higher.
The above embodiments are preferred examples of the present invention, and are not intended to limit the scope of the present invention.
Claims (5)
1. A urea solution atomizing spray gun, comprising:
the gun head is used for spraying urea solution and is provided with a nozzle;
the gun barrel is in threaded connection with the gun head;
a protective sleeve welded on the barrel;
the compressed air interface is welded on the protective sleeve and used for the inlet of compressed air;
the urea solution interface is welded at the axial tail end of the gun barrel and used for the entry of urea solution; and
the rotational flow mixing chamber is arranged at the end part of the gun barrel and is used for fully mixing gas-liquid two-phase flow and transferring energy,
wherein the compressed air interface is communicated with the rotational flow mixing chamber, so that the compressed air enters the rotational flow mixing chamber,
the urea solution tangentially enters the rotational flow mixing chamber of the gun body through the urea solution interface,
the compressed air and the urea solution are fully mixed in the rotational flow mixing chamber, and energy is transferred.
2. The urea solution atomizing spray gun according to claim 1, characterized in that:
the gun head and the gun barrel are mutually matched and connected together through internal threads inside the gun head and external threads outside the gun barrel.
3. The urea solution atomizing spray gun according to claim 1, characterized in that:
wherein, the compressed air interface is internally provided with internal threads.
4. The urea solution atomizing spray gun according to claim 1, characterized in that:
wherein, the rotational flow mixing chamber is connected with the gun barrel through a set screw.
5. The urea solution atomizing spray gun according to claim 1, characterized in that:
the spray gun comprises a gun head, a spray nozzle and a spray nozzle, wherein the nozzle of the gun head is provided with an axial small hole for controlling the shape of spray to be fan-shaped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010127151.9A CN111298613A (en) | 2020-02-28 | 2020-02-28 | Urea solution atomizing spray gun |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010127151.9A CN111298613A (en) | 2020-02-28 | 2020-02-28 | Urea solution atomizing spray gun |
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| Publication Number | Publication Date |
|---|---|
| CN111298613A true CN111298613A (en) | 2020-06-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010127151.9A Pending CN111298613A (en) | 2020-02-28 | 2020-02-28 | Urea solution atomizing spray gun |
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| CN (1) | CN111298613A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102671533A (en) * | 2012-06-11 | 2012-09-19 | 杭州浙大天元科技有限公司 | Low-air consumption effervescent atomizer applicable to SNCR (selective non-catalytic reduction) denitrification technology |
| CN103657915A (en) * | 2013-11-30 | 2014-03-26 | 江苏科行环境工程技术有限公司 | Gas-liquid two-phase flow spray gun special for flue gas denitrification |
| CN104525409A (en) * | 2014-12-25 | 2015-04-22 | 刘怀平 | Double-fluid spray gun for denitration |
| US20150345785A1 (en) * | 2014-06-03 | 2015-12-03 | James M. Valentine | Infinitely Variable Injector For Improved SNCR Performance |
-
2020
- 2020-02-28 CN CN202010127151.9A patent/CN111298613A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102671533A (en) * | 2012-06-11 | 2012-09-19 | 杭州浙大天元科技有限公司 | Low-air consumption effervescent atomizer applicable to SNCR (selective non-catalytic reduction) denitrification technology |
| CN103657915A (en) * | 2013-11-30 | 2014-03-26 | 江苏科行环境工程技术有限公司 | Gas-liquid two-phase flow spray gun special for flue gas denitrification |
| US20150345785A1 (en) * | 2014-06-03 | 2015-12-03 | James M. Valentine | Infinitely Variable Injector For Improved SNCR Performance |
| CN104525409A (en) * | 2014-12-25 | 2015-04-22 | 刘怀平 | Double-fluid spray gun for denitration |
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Application publication date: 20200619 |