CN218795097U - Ammonia water supply system - Google Patents

Abstract

The utility model provides an ammonia water supply system, which comprises an ammonia water gas generating device, a hot air generating device and an ammonia-air mixer, wherein the ammonia water gas generating device comprises an ammonia water storage tank, a swirler and an evaporator which are connected in sequence; the hot air generating device comprises a steam heater, an air pipe and a water steam pipe, wherein the air pipe and the water steam pipe are respectively connected with the steam heater; the ammonia gas inlet of the ammonia air mixer is connected with the ammonia water gas generating device, the air inlet of the ammonia air mixer is connected with the hot air generating device, and the outlet of the ammonia air mixer is connected with the ammonia spraying grid. The utility model discloses can purify the aqueous ammonia before evaporating into gaseous, prevent to block up ammonia injection grid jet orifice to reduce aqueous ammonia vaporization system's area.

Description

Ammonia water supply system

Technical Field

The utility model relates to a denitration technique field, more specifically relates to an aqueous ammonia supply system.

Background

In order to prevent the environment from being polluted by excessive nitrogen oxides generated after coal in the boiler is combusted, the flue gas in the flue is subjected to denitration treatment. SCR (selective catalytic reduction) denitration is a treatment process aiming at nitrogen oxides in flue gas emission, namely, under the action of a catalyst, a reducing agent ammonia is sprayed to reduce the nitrogen oxides in the flue gas into N2 and H2O.

The industrial ammonia water is an aqueous solution containing 25-28% of ammonia, and before SCR denitration, the ammonia water needs to be evaporated into gas, diluted to a certain concentration and then sprayed into a flue, and reacts with nitrogen oxide NOx in flue gas under the action of a catalyst to reduce the NOx into N2 and water which have little influence on the atmosphere. However, in the ammonia water supply process of the denitration device, the ammonia water source is impure and contains impurities, which often causes the blockage of the injection holes of the ammonia injection grid, and in addition, in the prior art, the hot air of the boiler is adopted to evaporate the ammonia water into gas, and the pipe diameter of the hot air source pipeline is large, which occupies a large space.

SUMMERY OF THE UTILITY MODEL

In view of the above problem, the present invention provides an ammonia water supply system, which can purify the ammonia water before evaporating into gas, prevent blocking the injection holes of the ammonia injection grid, and reduce the floor area of the ammonia water evaporation system.

The utility model provides an ammonia water supply system, which comprises an ammonia water gas generating device, a hot air generating device and an ammonia-air mixer, wherein the ammonia water gas generating device comprises an ammonia water storage tank, a swirler and an evaporator which are connected in sequence; the hot air generating device comprises a steam heater, an air pipe and a water steam pipe which are respectively connected with the steam heater; the ammonia gas import of empty blender of ammonia with aqueous ammonia gas produces the device and connects, the air intlet of empty blender of ammonia with hot-air producing device connects, the export and the ammonia injection grid of empty blender of ammonia are connected.

Wherein, optional scheme does, the feed inlet of swirler is connected through two aqueous ammonia delivery pumps of parallelly connected the aqueous ammonia storage jar.

Wherein, the selectable scheme is that the ammonia water delivery pump is a stainless steel acid and alkali resistant magnetic pump.

The cyclone comprises an evaporator, a cyclone body, a sand discharge port, a waste liquid tank, a cyclone, an overflow pipe, an evaporator and a waste liquid tank, wherein the overflow pipe is connected to an overflow port of the cyclone body, the overflow pipe is connected to a feed port of the evaporator, and the sand discharge port of the cyclone body is connected to the waste liquid tank.

Wherein, the optional scheme is that an ammonia water filter is connected between the overflow pipe and the feed inlet of the evaporator.

Wherein, optionally, a steam inlet of the evaporator is connected with a steam inlet pipe, and a discharge hole of the evaporator is connected to an ammonia gas inlet of the ammonia-air mixer.

Wherein, the optional proposal is that the air pipe of the steam heater is connected with two blowers which are connected in parallel, the water-steam pipe is connected with a steam inlet of the steam heater, and an air outlet of the steam heater is connected to an air inlet of the ammonia-air mixer.

Wherein, optionally, the blower is a centrifugal blower.

Wherein, the optional scheme is that the evaporator is a steam evaporation type ammonia water evaporator.

Wherein, the optional scheme is that the swirler is a deslagging swirler.

From the above description, the ammonia water supply system provided by the utility model comprises an ammonia water gas generating device, a hot air generating device and an ammonia air mixer, wherein the ammonia water gas generating device comprises an ammonia water storage tank, a swirler and an evaporator which are connected in sequence; the hot air generating device comprises a steam heater, an air pipe and a water steam pipe which are respectively connected with the steam heater; the ammonia gas import and the aqueous ammonia gas of ammonia empty blender produce the device and be connected, and the air intlet and the hot-air of ammonia empty blender produce the device and be connected, and the export of ammonia empty blender and the grid connection that spouts ammonia. The utility model discloses an aqueous ammonia raw materials purifies through the swirler, gets rid of impurity, then evaporates into the gaseous state through steam evaporation formula aqueous ammonia evaporimeter, mixes the back with hot-air again, forms the aqueous ammonia gas of the suitable proportion that the denitration was used, sends into the inlet end of spouting ammonia grid. The utility model discloses the aqueous ammonia gas that produces is pure, impurity is few, and the difficult ammonia grid that spouts that blocks up of aqueous ammonia in the equipment operation process to but get rid of the hot-blast vaporization system of boiler secondary, reduced equipment area.

Drawings

Other objects and results of the present invention will become more apparent and more readily appreciated as the same becomes better understood by reference to the following description and appended claims, taken in conjunction with the accompanying drawings.

In the drawings:

fig. 1 is a schematic structural view of an ammonia water supply system according to an embodiment of the present invention;

the system comprises a 1-ammonia water gas generating device, a 2-hot air generating device, a 3-ammonia-air mixer, a 4-ammonia water storage tank, a 5-cyclone, a 6-evaporator, a 7-steam heater, an 8-air pipe, a 9-water steam pipe, a 10-ammonia spraying grid, an 11-ammonia water delivery pump, a 12-waste liquid tank, a 13-ammonia water filter, a 14-steam inlet pipe and a 15-blower.

The same reference numbers in all figures indicate similar or corresponding features or functions.

Detailed Description

The present invention is capable of various modifications and embodiments, and specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. However, the present invention is not limited to the specific embodiments, and all modifications, equivalents, and alternatives falling within the spirit and technical scope of the present invention are to be understood as being included.

Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Fig. 1 is a schematic structural view of an ammonia water supply system according to an embodiment of the present invention;

as shown in fig. 1, the ammonia water supply system provided in this embodiment can be used for providing ammonia water gas for the denitration ammonia injection system, and can also be used for providing ammonia water gas in other occasions.

This aqueous ammonia supply system includes aqueous ammonia gas generator 1, hot-air generator 2 and empty blender 3 of ammonia, and aqueous ammonia gas generator 1 is used for purifying, evaporation vaporization aqueous ammonia, obtains gaseous aqueous ammonia gas, and hot-air generator 2 is used for producing the air after the heating, and aqueous ammonia gas and hot-air mix in empty blender 3 of ammonia, and aqueous ammonia gas dilutes into appropriate proportion, do benefit to aqueous ammonia gas and spread when spouting the ammonia.

The ammonia water gas generating device 1 comprises an ammonia water storage tank 4, a swirler 5 and an evaporator 6 which are connected in sequence. The raw material aqueous ammonia is stored in aqueous ammonia storage jar 4, inputs swirler 5 with raw material aqueous ammonia for better faster, is connected with aqueous ammonia delivery pump 11 between swirler 5's feed inlet and aqueous ammonia storage jar 4. Can connect two aqueous ammonia delivery pumps 11 that connect in parallel between aqueous ammonia storage jar 4 and swirler 5 feed inlet, two aqueous ammonia delivery pumps 11's transport capacity is stronger. The ammonia water delivery pump 11 can be a stainless steel acid and alkali resistant magnetic pump.

The raw material ammonia water can remove impurities after entering the cyclone 5, so that the ammonia water purification is favorable for the denitration effect. Cyclone 5 may be a deslagged cyclone. The cyclone 5 separates impurities from ammonia water by using the centrifugal sedimentation principle, discharges heavier impurities from a bottom sand discharge port, and discharges pure ammonia water from a top overflow port. An overflow pipe is connected to an overflow port of the cyclone 5, the overflow pipe is connected to a feed port of the evaporator 6, a sand discharge port of the cyclone 5 is connected to a waste liquid tank 12, and the waste liquid tank 12 collects discharged impurities.

In order to further remove impurities in the ammonia water, an ammonia water filter 13 can be connected between the overflow pipe and the feed inlet of the evaporator 6.

In order to evaporate the purified ammonia water into a mixed gas of ammonia gas and water vapor, an overflow pipe of the cyclone 5 is connected to a feed port of the evaporator 6, a vapor inlet 14 is connected to a vapor inlet of the evaporator 6, and the evaporator 6 evaporates and vaporizes the ammonia water. In order to reduce the space occupied by the evaporator, a steam evaporation type ammonia water evaporator is adopted instead of a boiler secondary hot air evaporation type heat source, and the incoming pipe of the steam evaporation type ammonia water evaporator is very thin, so that the on-site pipeline arrangement is convenient. The steam in the steam supply pipe 14 is saturated steam having a certain pressure, and the evaporator 6 evaporates the ammonia water into ammonia water gas of an ammonia/steam mixture. The ammonia gas is further diluted and enters the SCR reactor through the ammonia injection grid 10 to be subjected to denitration reaction.

Adopt empty blender 3 of ammonia to carry out the gaseous dilution of aqueous ammonia, the ammonia import and the aqueous ammonia gas of the empty blender 3 of ammonia produce the device 1 and be connected, the aqueous ammonia gas gets into empty blender 3 of ammonia, and the air intlet and the hot-air of the empty blender 3 of ammonia produce the device 2 and be connected, and the hot-air gets into empty blender 3 of ammonia, the aqueous ammonia gas and the even mixture of hot-air, and the export and the ammonia grid 10 that spout of the empty blender 3 of ammonia are connected.

The hot air generating apparatus 2 includes a steam heater 7, an air pipe 8 and a water steam pipe 9 connected to the steam heater 7, respectively. The air pipe 8 feeds air to the steam heater 7, the water steam pipe 9 feeds steam to the steam heater 7, and the air is heated by the steam heater 7 and then fed to the ammonia-air mixer 3. An air pipe 8 is connected to an air inlet of the steam heater 7, the air pipe 8 is connected with two blowers 15 which are connected in parallel, air is conveniently conveyed to the steam heater 7, and a steam inlet of the steam heater 7 is connected with a steam pipe 9.

The ammonia gas inlet of the ammonia-air mixer 3 is connected with the discharge hole of the evaporator 6, the air inlet of the ammonia-air mixer 3 is connected with the air outlet of the steam heater 7, and the ammonia water gas is mixed with the hot air and then is output from the outlet of the ammonia-air mixer, so that pure steam ammonia with proper proportion is achieved.

At this moment, the ammonia gas can not corrode and block the ammonia injection grid 10, and can be well diffused after being injected, so that the denitration effect is improved.

The ammonia water supply system according to the present invention is described above by way of example with reference to the accompanying drawings. However, it should be understood by those skilled in the art that various modifications can be made to the ammonia water supply system of the present invention without departing from the scope of the present invention. Accordingly, the scope of the present invention should be determined by the content of the appended claims.

Claims (10)

1. An ammonia water supply system is characterized by comprising an ammonia water gas generating device, a hot air generating device and an ammonia-air mixer, wherein,

the ammonia water gas generating device comprises an ammonia water storage tank, a swirler and an evaporator which are connected in sequence;

the hot air generating device comprises a steam heater, an air pipe and a water steam pipe, wherein the air pipe and the water steam pipe are respectively connected with the steam heater;

the ammonia gas import of empty blender of ammonia with aqueous ammonia gas produces the device and connects, the air intlet of empty blender of ammonia with hot-air producing device connects, the export and the ammonia injection grid of empty blender of ammonia are connected.

2. The ammonia water supply system according to claim 1, wherein the feed inlet of the cyclone is connected to the ammonia water storage tank by two ammonia water feed pumps connected in parallel.

3. The ammonia water supply system of claim 2, wherein the ammonia water delivery pump is a stainless steel acid and alkali resistant magnetic pump.

4. The ammonia water supply system according to claim 1, wherein an overflow pipe is connected to an overflow port of the cyclone, the overflow pipe is connected to a feed port of the evaporator, and a sand discharge port of the cyclone is connected to a waste liquid tank.

5. The ammonia water supply system according to claim 4, wherein an ammonia water filter is connected between the overflow pipe and the feed port of the evaporator.

6. The ammonia water supply system according to claim 1, wherein a steam inlet pipe is connected to a steam inlet of the evaporator, and a discharge port of the evaporator is connected to an ammonia gas inlet of the ammonia air mixer.

7. The ammonia water supply system according to claim 1, wherein two blowers are connected in parallel to the air pipe of the steam heater, the water steam pipe is connected to the steam inlet of the steam heater, and the air outlet of the steam heater is connected to the air inlet of the ammonia air mixer.

8. The ammonia water supply system of claim 7, wherein the blower is a centrifugal blower.

9. The ammonia water supply system of claim 1, wherein the evaporator is a vapor evaporative ammonia water evaporator.

10. The ammonia water supply system of claim 1, wherein the cyclone is a deslag cyclone.

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