Ammonia water vaporization and ammonia spraying device

Abstract

The utility model provides an ammonia water vaporization and ammonia spraying device, and relates to the technical field of environmental protection. Comprising a dilution fan used for conveying mixed gas of low-temperature flue gas and high-temperature flue gas, a first adjusting assembly used for controlling the temperature of an inlet of the dilution fan, an ammonia water vaporizer, a double-fluid spray gun, a conveying pump, a second adjusting assembly used for controlling the conveying flow of ammonia water and an ammonia spraying grid. The ammonia water vaporizer is connected with the ammonia spraying grid, a plurality of spoilers are arranged at a nozzle outlet of the ammonia spraying grid at intervals, the double-fluid spray gun is arranged on the ammonia water vaporizer, and the two ends of the double-fluid spray gun are communicated with the ammonia water vaporizer and the conveying pump respectively; the ammonia water vaporizing device in the device is uniform in atomization, meanwhile, the ammonia escape rate is remarkably reduced, the denitration efficiency and the vaporizing efficiency are improved, the probability of secondary pollution is reduced, and full contact and efficient reaction of NOx and ammonia gas in a reaction area are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of environmental protection, in particular to an ammonia water vaporization and ammonia spraying device. Background Art

[0002] As my country's industrial production and environmental protection standards become increasingly stringent, nitrogen oxides (NOx) emitted by industrial furnaces, especially those burning coal, gas and special chemical processes, have become an important factor restricting the improvement of atmospheric environmental quality. Among the current air pollution control technologies, selective non-catalytic reduction (SNCR) and selective catalytic reduction (SCR) technologies are widely used in furnace flue gas denitrification treatment and ammonia plays a core role as a reducing agent in these processes.

[0003] However, the traditional ammonia injection system has problems such as uneven ammonia atomization, low ammonia vaporization efficiency, low reductant utilization, and high ammonia escape rate, which not only affects the denitrification efficiency, but also may cause secondary pollution, such as the potential harm of ammonia to the environment and human health. In addition, under high-temperature flue gas conditions, how to ensure that ammonia water is quickly and fully converted into ammonia and evenly mixed into the flue gas flow so as to effectively react with NOx has become a key technical problem that needs to be solved in the field of pollution prevention and control of industrial furnaces. Utility Model Content

[0004] The purpose of the utility model is to solve the problems raised in the above background technology, and then proposes an ammonia water vaporization and ammonia spraying device.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] An ammonia vaporization and ammonia spraying device comprises a dilution fan for conveying a mixture of low-temperature flue gas and high-temperature flue gas, a first regulating component for controlling the inlet temperature of the dilution fan, an ammonia vaporizer, a dual-fluid spray gun, a delivery pump, a second regulating component for controlling the ammonia delivery flow rate, and an ammonia spraying grid, wherein the dilution fan is connected to the ammonia vaporizer, the ammonia vaporizer is connected to the ammonia spraying grid, a plurality of interfering flow members are arranged at intervals at the nozzle outlet of the ammonia spraying grid, the dual-fluid spray gun is arranged on the ammonia vaporizer, and the two ends of the dual-fluid spray gun are respectively connected to the ammonia vaporizer and the delivery pump.

[0007] The ammonia vaporization device in this device atomizes evenly, and at the same time, the ammonia escape rate is significantly reduced, the denitrification efficiency and vaporization efficiency are improved, and the probability of secondary pollution is reduced, ensuring full contact and efficient reaction between NOx and ammonia in the reaction area.

[0008] Furthermore, the first regulating component includes a smoke flow duct, a first regulating valve and a thermometer. The thermometer is arranged inside the smoke flow duct and the first regulating valve is arranged on the smoke flow duct. A dilution fan is connected to one end of the smoke flow duct.

[0009] The above scheme realizes precise control of the temperature of the heat source for vaporizing ammonia water through the first regulating component, thereby preventing the overheating of the flue gas at the inlet of the dilution fan and the condensation of ammonia water after vaporization.

[0010] Furthermore, the second regulating component includes an ammonia water circulation pipeline, a flow meter and a second regulating valve. The ammonia water circulation pipeline is provided with a flow meter and a second regulating valve, and both ends of the ammonia water circulation pipeline are connected to a delivery pump and a dual-fluid spray gun respectively.

[0011] The above scheme realizes precise ammonia injection through the second regulating component, which not only reduces ammonia escape but also reduces the energy consumption of ammonia evaporation.

[0012] Furthermore, the discharge end of the ammonia vaporizer is connected to a sewage discharge component.

[0013] Furthermore, the sewage discharge component is a steam trap or a water seal tank.

[0014] In the above scheme, when condensate is produced due to operational errors, it can be automatically discharged through the sewage discharge part to prevent clogging of the pipeline.

[0015] Furthermore, a backup dilution fan is also included.

[0016] In the above scheme, when the dilution fan fails, the spare dilution fan can be used immediately to complete subsequent operations.

[0017] Furthermore, the ammonia injection grid comprises a plurality of air inlet pipes connected to the ammonia vaporizer, each of which is provided with a branch valve and corresponds to the plurality of nozzle groups of the ammonia injection grid.

[0018] The above scheme controls the branch flow rate by switching the branch valve to achieve uniform ammonia flow from each nozzle in the ammonia injection grid into the denitrification flue.

[0019] Furthermore, a spoiler is also provided in the ammonia vaporizer.

[0020] The above solution can further improve the uniformity of mixing of ammonia smoke mixture by means of the spoiler.

[0021] Furthermore, the spoiler is a spoiler plate or a spoiler fin.

[0022] Compared with the prior art, the beneficial effects of the utility model are:

[0023] 1. The ammonia vaporizer effectively solves the problem of easy condensation of ammonia after vaporization and easy clogging and scaling of steam evaporator;

[0024] 2. The pre-installation of the dilution fan effectively solves the problem of ammonia leakage and environmental pollution caused by leakage of the dilution fan shaft seal, while also preventing ammonia from corroding the dilution fan;

[0025] 3. The double-fluid spray gun has good ammonia atomization effect, which is conducive to evaporation and ensures the denitrification effect;

[0026] 4. The second regulating component is interlocked with the chimney outlet online detection to achieve accurate ammonia injection, which not only reduces ammonia escape, but also reduces the energy consumption of ammonia evaporation;

[0027] 5. The first regulating component is used to achieve precise control of the temperature of the heat source for vaporizing ammonia water, thereby preventing the overheating of the flue gas at the inlet of the dilution fan and the condensation of ammonia water after vaporization. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0029] Reference numerals:

[0030] 1. Dilution fan; 11. Standby dilution fan; 101. First regulating valve; 102. Thermometer; 2. Ammonia vaporizer; 3. Dual-fluid spray gun; 4. Delivery pump; 5. Second regulating assembly; 51. Flow meter; 52. Second regulating valve; 6. Ammonia spray grid; 7. Sewage discharge parts. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. The utility model is further described in combination with the drawings and embodiments:

[0032] like Figure 1As shown, an ammonia vaporization and ammonia spraying device includes a dilution fan 1 for conveying a mixture of low-temperature flue gas and high-temperature flue gas, a first regulating component for controlling the inlet temperature of the dilution fan 1, an ammonia vaporizer 2, a dual-fluid spray gun 3 (compressed air is connected to the compressed air inlet of the dual-fluid spray gun 3), a delivery pump 4, a second regulating component 5 for controlling the ammonia delivery flow rate and an ammonia spraying grid 6 (specifically installed in the denitrification inlet flue), the dilution fan 1 is connected to the ammonia vaporizer 2, the ammonia vaporizer 2 is connected to the ammonia spraying grid 6, and a plurality of flow-interrupting members (the flow-interrupting members are one of the flow-interrupting plates or the flow-interrupting fins) are arranged at intervals at the nozzle outlet of the ammonia spraying grid 6, the dual-fluid spray gun 3 is arranged on the ammonia vaporizer 2, and the two ends of the dual-fluid spray gun 3 are respectively connected to the ammonia vaporizer 2 and the delivery pump 4.

[0033] In a further refinement of the embodiment of the utility model, the first regulating component includes a smoke flow duct, a first regulating valve 101 and a thermometer 102, the thermometer 102 is arranged inside the smoke flow duct and the first regulating valve 101 is arranged on the smoke flow duct, and a dilution fan 1 is connected to one end of the smoke flow duct.

[0034] In a further refinement of the embodiment of the utility model, the second regulating component 5 includes an ammonia water circulation pipeline, a flow meter 51 and a second regulating valve 52. The flow meter 51 and the second regulating valve 52 are arranged on the ammonia water circulation pipeline, and the two ends of the ammonia water circulation pipeline are respectively connected to the delivery pump 4 and the dual-fluid spray gun 3.

[0035] In a further refinement of the embodiment of the utility model, the discharge end of the ammonia vaporizer 2 is connected to the sewage discharge member 7. Specifically, the sewage discharge member 7 is one of a steam trap or a water seal tank;

[0036] The sewage discharge part 7 is installed at the low point of the outlet pipe of the ammonia vaporizer 2, and can be set as either a steam trap or a water seal groove. Its function is to automatically discharge condensate when an operating error occurs to prevent the pipe from being blocked. It should be noted that the operating error specifically includes failure to open the outlet valve of the dilution fan 1, failure to pass compressed air for atomization, and low temperature.

[0037] The workflow of this utility model:

[0038] During operation, the mixed gas of the high-temperature flue gas from the hot blast furnace outlet and the low-temperature flue gas before denitration is controlled by the first regulating component to have a mixed temperature not higher than 300°C (this can not only extend the service life of the dilution fan 1, but also reduce the phenomenon of condensation after subsequent ammonia water vaporization). The amount of low-temperature flue gas is greater than that of high-temperature flue gas, that is, the temperature range of the mixed gas is controlled by controlling the amount of high-temperature flue gas introduced. After the temperature adjustment is completed, the mixed gas is blown into the ammonia water vaporizer 2 through the dilution fan 1. At the same time, the ammonia is realized by the delivery pump 4 in cooperation with the second regulating component 5. Water is delivered at a uniform fixed flow rate, and then the hot flue gas vaporizes the ammonia droplets sprayed from the dual-fluid spray gun 3 and mixes them into an ammonia-smoke mixture with a concentration of no more than 5%. The ammonia-smoke mixture then flows into the ammonia spray grid 6 and is then sprayed into the denitrification inlet flue through the ammonia spray grid 6 to participate in the denitrification reaction. During the injection of the ammonia-smoke mixture into the ammonia spray grid 6, the spoiler effectively improves the mixing state of the flue gas and ammonia, that is, increases the uniformity of the mixing of the two gases, ensures sufficient contact and efficient reaction between NOx and ammonia in the reaction area, thereby improving the denitrification efficiency and reducing ammonia escape.

[0039] The significant advantages of each part are:

[0040] 1. Ammonia vaporizer 2 uses hot air furnace flue gas as heat source to evaporate ammonia, which not only solves the problem of easy condensation of ammonia after vaporization due to lack of steam and low steam pressure, but also solves the problem of easy clogging and scaling of steam evaporator;

[0041] 2. The dilution fan 1 is placed in front of the fan 1 to prevent the leakage of ammonia gas and pollution of the environment caused by the leakage of the shaft seal of the dilution fan 1, and to prevent the ammonia gas from corroding the dilution fan 1;

[0042] 3. The first regulating component sets the inlet temperature of the dilution fan 1 to be interlocked with the corresponding regulating valve, and adjusts the amount of high-temperature flue gas mixed to achieve precise control of the temperature of the ammonia vaporization heat source, to prevent the inlet flue gas of the dilution fan 1 from overheating and condensation after ammonia vaporization;

[0043] 4. The second regulating component 5 is linked with the online detection of the chimney outlet, which can realize accurate ammonia spraying, so that the ammonia water can fully react with the nitrogen oxides in the flue gas, improve the denitrification efficiency and reduce the ammonia escape phenomenon.

[0044] Compared with the prior art, the ammonia vaporization device in the present device has uniform atomization, and at the same time, the ammonia escape rate is significantly reduced, the denitrification efficiency and vaporization efficiency are improved, and the probability of secondary pollution is reduced, ensuring full contact and efficient reaction of NOx and ammonia in the reaction area.

[0045] In some embodiments, Figure 1 As shown, the device further includes a standby dilution fan 11; when the dilution fan 1 fails, the standby dilution fan 11 can be immediately used to complete subsequent operations.

[0046] In other embodiments, the ammonia injection grid 6 includes a plurality of air inlet pipes connected to the ammonia vaporizer 2, each of which is provided with a branch valve and corresponds to the multiple groups of nozzles of the ammonia injection grid 6. The air inlet pipe and the branch valve are not shown in the figure; this embodiment controls the branch flow rate by switching the branch valve to achieve uniform ammonia flow rate of each nozzle in the ammonia injection grid 6 into the denitrification flue.

[0047] In other embodiments, a spoiler is also provided in the ammonia vaporizer 2, which is not shown in the figure. This embodiment can further improve the uniformity of the mixing of the ammonia-smoke mixture through the spoiler.

[0048] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions in the specification are only to illustrate the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the protection required by the utility model. The scope of protection required by the utility model is defined by the attached claims and their equivalents.

Claims

1. An ammonia vaporization and ammonia spraying device, characterized in that: The invention comprises a dilution fan (1) for conveying a mixed gas of low-temperature flue gas and high-temperature flue gas, a first regulating component for controlling the inlet temperature of the dilution fan (1), an ammonia vaporizer (2), a dual-fluid spray gun (3), a delivery pump (4), a second regulating component (5) for controlling the ammonia delivery flow rate, and an ammonia spraying grid (6), wherein the dilution fan (1) is connected to the ammonia vaporizer (2), the ammonia vaporizer (2) is connected to the ammonia spraying grid (6), a plurality of flow-interfering parts are arranged at intervals at the nozzle outlet of the ammonia spraying grid (6), the dual-fluid spray gun (3) is arranged on the ammonia vaporizer (2), and the two ends of the dual-fluid spray gun (3) are respectively connected to the ammonia vaporizer (2) and the delivery pump (4).

2. The ammonia vaporization and ammonia injection device according to claim 1, characterized in that: The first regulating component comprises a smoke flow duct, a first regulating valve (101) and a thermometer (102), wherein the thermometer (102) is arranged inside the smoke flow duct and the first regulating valve is arranged on the smoke flow duct, and a dilution fan (1) is connected to one end of the smoke flow duct.

3. The ammonia vaporization and ammonia injection device according to claim 1, characterized in that: The second regulating component (5) comprises an ammonia water circulation pipeline, a flow meter (51) and a second regulating valve (52); the ammonia water circulation pipeline is provided with the flow meter (51) and the second regulating valve (52); and the two ends of the ammonia water circulation pipeline are respectively connected to a delivery pump (4) and a dual-fluid spray gun (3).

4. The ammonia vaporization and ammonia injection device according to claim 1, characterized in that: The discharge end of the ammonia vaporizer (2) is connected to a sewage discharge component (7).

5. The ammonia vaporization and ammonia injection device according to claim 4, characterized in that: The sewage discharge member (7) is a steam trap or a water seal groove.

6. The ammonia vaporization and ammonia injection device according to claim 1, characterized in that: It also includes a standby dilution fan (11).

7. The ammonia vaporization and ammonia injection device according to claim 1, characterized in that: The ammonia spraying grid (6) comprises a plurality of air inlet pipes connected to the ammonia vaporizer (2), each of the air inlet pipes is provided with a branch valve and the air inlet pipes correspond to the plurality of nozzle groups of the ammonia spraying grid (6).

8. The ammonia vaporization and ammonia injection device according to claim 1, characterized in that: The ammonia vaporizer (2) is also provided with a spoiler.

9. The ammonia vaporization and ammonia injection device according to claim 8, characterized in that: The spoiler is a spoiler plate or a spoiler fin.

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