CN218077232U

CN218077232U - Urea direct injection system

Info

Publication number: CN218077232U
Application number: CN202221207629.XU
Authority: CN
Inventors: 董陈; 何育东; 王晓冰; 潘栋; 罗志; 杨世极; 袁壮; 李淑宏; 舒凯; 尚桐; 徐晓涛; 杨晓刚; 石磊
Original assignee: Xian Thermal Power Research Institute Co Ltd
Current assignee: Xian Thermal Power Research Institute Co Ltd
Priority date: 2022-05-18
Filing date: 2022-05-18
Publication date: 2022-12-20
Anticipated expiration: 2032-05-18

Abstract

The utility model relates to a pyrolysis equipment technical field specifically discloses a urea directly spouts system, urea directly spouts the system and includes the boiler and spray the unit, and the boiler has the flue that admits air, sprays the unit and includes a plurality of nozzles, and the one end of nozzle stretches into the flue that admits air, and a plurality of nozzles are at the upwards interval arrangement of circumference of the flue that admits air. The utility model discloses a urea directly spouts system can improve the homogeneity that the ammonia distributes in the flue.

Description

Urea direct injection system

Technical Field

The utility model relates to a pyrolysis equipment technical field, concretely relates to urea directly spouts system.

Background

The urea is spouted the pyrolysis technology and is spouted into SCR import flue after atomizing urea solution, utilizes the high temperature flue gas heat in the SCR import flue to become the required reductant of SCR denitration with urea solution pyrolysis, and the urea pyrolysis stove in the correlation technique is directly spouted the system and is included: dilution water devices, metering devices, distribution devices, urea solution injectors and the like, however, the pyrolysis system in the related art, and the unreasonable arrangement of nozzles, cause the ammonia gas distribution in the flue to be uneven.

SUMMERY OF THE UTILITY MODEL

The present invention aims at solving at least one of the technical problems in the related art to a certain extent. Therefore, the embodiment of the utility model provides a urea directly spouts system can improve the homogeneity of ammonia distribution in the flue.

The utility model discloses urea direct injection system, include: a boiler having an intake flue; the spraying unit comprises a plurality of nozzles, one end of each nozzle extends into the air inlet flue, and the plurality of nozzles are arranged at intervals in the circumferential direction of the air inlet flue.

The utility model discloses urea directly spouts system can improve the homogeneity that ammonia distributes in the flue.

In some embodiments, the plurality of nozzles are divided into a first nozzle group and a second nozzle group, the first nozzle group and the second nozzle group are symmetrically arranged in a first direction, and the nozzles in the first nozzle group correspond to the nozzles in the second nozzle group one to one in the first direction.

In some embodiments, the urea direct injection system further includes an air blowing part, a first pipeline and a second pipeline, one end of the first pipeline and one end of the second pipeline are respectively communicated with the air blowing part, the other end of the first pipeline is respectively communicated with the plurality of nozzles, and the other end of the second pipeline is communicated with the distribution unit.

In some embodiments, the urea direct injection system further comprises a metering unit and a third pipeline, one end of the metering unit is communicated with the storage tank, the other end of the metering unit is communicated with the third pipeline, and the third pipeline is communicated with the distribution unit.

In some embodiments, the distribution unit further comprises a third pipeline, and the urea direct injection system further comprises a metering unit, one end of the metering unit is communicated with the storage tank, the other end of the metering unit is communicated with the third pipeline, and the third pipeline is communicated with the plurality of nozzles.

In some embodiments, the urea direct injection system further comprises a urea preparation unit connected to the dosing unit, the urea preparation unit being configured to prepare a urea solution.

In some embodiments, the urea production unit comprises a dissolving tank, a storage tank, a first pump, and a second pump, one end of the first pump being in communication with the dissolving tank, the other end of the first pump being in communication with the storage tank, one end of the second pump being in communication with the storage tank, the other end of the second pump being in communication with the metering unit.

In some embodiments, the urea production unit further comprises an agitation member having one end protruding into the dissolving tank to dissolve urea particles.

In some embodiments, the urea direct injection system further comprises a dilution unit comprising a third pump and a mixer, one end of the mixer being connected to the dosing unit and the other end of the mixer being connected to the dispensing unit, one end of the third pump being adapted to be connected to a water source, the other end of the third pump being located between the mixer and the dosing unit.

In some embodiments, the urea direct injection system further comprises a cooling unit connected to the plurality of injectors, respectively.

Drawings

Fig. 1 is a schematic diagram of a urea direct injection system according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of an injection unit according to an embodiment of the present invention.

Reference numerals:

the boiler 1, the air intake flue 111,

the number of the ejection units 2, the nozzles 21,

a distribution unit 3, air-blowing members 4, a first pipe 5, a second pipe 6, a third pipe 7,

the metering unit 8 is arranged in such a way that,

a urea preparation unit 9, a dissolving tank 91, a storage tank 92, a first pump 93, a second pump 94, a stirring section 95,

a dilution unit 10, a third pump 101, a mixer 102, a cooling unit 11.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

As shown in fig. 1 and fig. 2, the urea direct injection system of the embodiment of the present invention includes a boiler 1 and an injection unit 2, the boiler 1 has an air intake flue 111, the injection unit 2 includes a plurality of nozzles 21, one end of each nozzle 21 extends into the air intake flue 111, and the plurality of nozzles 21 are arranged at intervals in the circumferential direction of the air intake flue 111.

Specifically, as shown in fig. 1, the outlet of the intake flue 111 communicates with an SCR reactor having a catalyst inside. A plurality of nozzles 21 are located on the side of the inlet flue 111 adjacent the boiler 1. As shown in fig. 2, a plurality of nozzles 21 are arranged at intervals in the circumferential direction of the intake stack 111.

As shown in fig. 1, the air intake duct 111 includes a first smoke segment and a second smoke segment, the flow area of the first smoke segment is constant in the direction of the flow of the smoke, the flow area of the second smoke segment is gradually increased in the direction of the flow of the smoke to form a flared duct, and a plurality of nozzles are respectively arranged in the first smoke segment and the second smoke segment.

The utility model discloses urea direct injection system is equipped with a plurality of nozzles 21 through week at air intake flue 111, makes the urea distribution in air intake flue 111 even to make more even of urea pyrolysis, and then can improve the homogeneity of ammonia distribution in the flue.

In some embodiments, the plurality of nozzles 21 are divided into a first nozzle 21 group and a second nozzle 21 group, the first nozzle 21 group and the second nozzle 21 group are symmetrically arranged in the first direction, and the nozzles 21 in the first nozzle 21 group are in one-to-one correspondence or staggered arrangement with the nozzles 21 in the second nozzle 21 group in the first direction.

Specifically, as shown in fig. 2, the first nozzle 21 group and the second nozzle 21 group are arranged oppositely in the left-right direction, the number of nozzles 21 within the first nozzle 21 group and the second nozzle 21 group is the same or different, and the nozzles 21 in the first nozzle 21 group are arranged symmetrically in the left-right direction with respect to the nozzles 21 in the second nozzle 21 group. The first nozzle 21 group and the second nozzle 21 group are symmetrically arranged in the left-right direction, so that the distribution of urea in the air inlet flue 111 is more uniform, and the distribution uniformity of ammonia in the flue is improved.

In some embodiments, the urea direct injection system further comprises a distribution unit 3, one end of the distribution unit 3 is respectively communicated with the plurality of nozzles 21, and the other end of the distribution unit 3 is adapted to be communicated with the storage tank 92.

Specifically, as shown in fig. 1, the outlet of the distribution unit 3 is communicated with the plurality of nozzles 21, that is, the distribution unit 3 distributes the urea solution into the plurality of nozzles 21, and the inlet of the distribution unit 3 is communicated with the storage tank 92, and it should be noted that the urea solution is stored in the storage tank 92.

For example, a valve is disposed on a pipeline of the distribution unit 3 communicating with the plurality of nozzles 21, and the valve can control the amount of urea injected from each nozzle 21, so as to adjust the distribution of urea in the air intake flue 111.

In some embodiments, the urea direct injection system further includes an air-blowing part 4, a first pipe 5, and a second pipe 6, one ends of the first pipe 5 and the second pipe 6 are respectively communicated with the air-blowing part 4, the other ends of the first pipe 5 are respectively communicated with the plurality of nozzles 21, and the other end of the second pipe 6 is communicated with the distribution unit 3.

For example, the blowing member 4 may generate compressed air, the compressed air is communicated with the plurality of nozzles 21 through the first pipeline 5, the compressed air in the first pipeline 5 is used as cooling air to cool the nozzles 21, the compressed air is communicated with the distribution unit 3 through the second pipeline 6 and forms a branch communicated with the plurality of nozzles 21 through the distribution unit 3, and the compressed air in the second pipeline 6 is atomized and injected into the flue at the plurality of nozzles 21 with the urea solution of which the flow rate is regulated in the distribution unit 3 after the pressure is regulated in the distribution unit 3 as atomized air.

The utility model discloses urea direct injection system through setting up blowing component 4, not only can improve the atomization effect of urea solution and can also cool off nozzle 21, has improved the efficiency of urea pyrolysis and nozzle 21's life.

In some embodiments, the urea direct injection system further comprises a metering unit 8 and a third line 7, one end of the metering unit 8 being in communication with the storage tank 92, the other end of the metering unit 8 being in communication with the third line 7, the third line 7 being in communication with the distribution unit 3.

Specifically, as shown in fig. 1, the inlet of the metering unit 8 communicates with the demineralized water while communicating with the storage tank 92, the urea solution is mixed with the demineralized water in the metering unit, and the outlet of the metering unit 8 communicates with the distribution unit 3 through the third pipe 7. I.e. the third line 7 delivers urea solution to the distribution unit 3.

The utility model discloses urea direct injection system, through setting up metering unit 8, can monitor the flow that gets into the urea solution in the distribution unit 3 and the flow of demineralized water, can get into the urea solution total flow in the distribution unit 3 according to the flue gas volume adjustment in the flue 111 that admits air.

In some embodiments, the urea direct injection system further includes a urea preparation unit 9, the urea preparation unit 9 is connected to the metering unit 8, the urea preparation unit 9 is used for preparing a urea solution, the urea preparation unit 9 includes a dissolving tank 91, a storage tank 92, a first pump 93 and a second pump 94, one end of the first pump 93 is communicated with the dissolving tank 91, the other end of the first pump 93 is communicated with the storage tank 92, one end of the second pump 94 is communicated with the storage tank 92, and the other end of the second pump 94 is communicated with the metering unit 8.

Specifically, as shown in fig. 1, the dissolving tank 91 is provided with a first inlet and an outlet, the first inlet is used for adding urea particles, the outlet is communicated with the inlet of the storage tank 92, the inlet of the first pump 93 is communicated with the outlet of the dissolving tank 91, the outlet of the first pump 93 is communicated with the inlet of the storage tank 92, the inlet of the second pump 94 is communicated with the outlet of the storage tank 92, and the outlet of the second pump 94 is communicated with the inlet of the metering unit 8.

For example, a branch is further provided on a pipe connecting the second pump 94 and the metering unit 8, one end of the branch communicates with the pipe connecting the second pump 94 and the metering unit 8, and the other end of the branch communicates with the storage tank 92.

The utility model discloses a urea directly spouts system can prepare and store urea solution through urea preparation unit 9 to link to each other with distribution unit 3 through metering unit 8, finally spray urea solution to in the flue 111 that admits air.

In some embodiments, the urea preparation unit 9 further includes a stirring part 95, and one end of the stirring part 95 extends into the dissolving tank 91 to dissolve urea particles.

Specifically, as shown in fig. 1, the lower end of the stirring member 95 extends into the dissolving tank 91, and the stirring member 95 dissolves urea granules in the dissolving tank 91.

The utility model discloses urea directly spouts system through setting up stirring part 95, can be quick dissolve the urea granule in the dissolving tank 91, has improved the dissolution efficiency of urea granule.

In some embodiments, the urea direct injection system further comprises a dilution unit 10, the dilution unit 10 comprising a third pump 101 and a mixer 102, one end of the mixer 102 being connected to the dosing unit 8, the other end of the mixer 102 being connected to the dispensing unit 3, one end of the third pump 101 being adapted to be connected to a water source, the other end of the third pump 101 being located between the mixer 102 and the dosing unit 8.

Specifically, as shown in fig. 1, an inlet of the mixer 102 communicates with the metering module, an outlet of the mixer 102 communicates with the dispensing unit 3, an inlet of the third pump 101 communicates with a water source, and the other end of the third pump 101 communicates with an inlet of the mixer 102. For example, the water discharged from the water source may be demineralized water. The dissolving tank 91 is also provided with a second inlet which is communicated with a water source.

The utility model discloses urea direct injection system through setting up dilution unit 10, can dilute 8 exhaust urea solutions of metering unit, can adjust the concentration that gets into urea solution in flue 111, guarantees the atomization effect of spray gun, improves urea pyrolysis efficiency.

In some embodiments, the urea direct injection system further includes a cooling unit 11, and the cooling unit 11 is connected to the plurality of nozzles 21, respectively, and is connected to the plurality of nozzles 21, respectively.

Specifically, as shown in fig. 1, the cooling unit 11 may discharge cooling water, and the cooling unit 11 is communicated with a plurality of nozzles 21, by which high-temperature ablation of the nozzles 21 in the flue of the boiler 1 may be prevented.

It should be noted that a valve is provided between the cooling unit 11 and the nozzle 21, and when the nozzle 21 needs to be cooled by the cooling water, the valve between the cooling unit 11 and the nozzle 21 may be opened. For example, the urea direct injection system of the embodiment of the present invention may cool the nozzle through the air blowing part 4, or the cooling unit 11, or both the air blowing part 4 and the cooling unit 11.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description of the present invention and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims

1. A direct urea injection system, comprising:

a boiler having an intake flue;

the injection unit, the injection unit includes a plurality of nozzles, the one end of nozzle stretches into the flue that admits air, it is a plurality of the nozzle is in the interval arrangement in the circumference of flue that admits air, it is a plurality of the nozzle divide into first nozzle group and second nozzle group, first nozzle group with second nozzle group is at first direction symmetrical arrangement, just in the first nozzle group the nozzle with in the second nozzle group the nozzle is in the one-to-one in the first direction.

2. The direct urea injection system of claim 1, further comprising a distribution unit having one end in communication with each of the plurality of injectors, the other end of the distribution unit adapted to communicate with a storage tank.

3. The direct urea injection system according to claim 2, further comprising an air blowing member, a first line and a second line, one end of each of the first line and the second line being communicated with the air blowing member, the other end of each of the first line being communicated with the plurality of nozzles, and the other end of each of the second line being communicated with the distribution unit.

4. The urea direct injection system of claim 2, further comprising a dosing unit and a third line, one end of the dosing unit being in communication with the storage tank, the other end of the dosing unit being in communication with the third line, the third line being in communication with the dispensing unit.

5. The urea direct injection system of claim 4, further comprising a urea preparation unit coupled to the dosing unit, the urea preparation unit configured to prepare a urea solution.

6. The urea direct injection system of claim 5, wherein the urea production unit includes a dissolving tank, a storage tank, a first pump, and a second pump, wherein one end of the first pump is in communication with the dissolving tank, the other end of the first pump is in communication with the storage tank, one end of the second pump is in communication with the storage tank, and the other end of the second pump is in communication with the metering unit.

7. The urea direct injection system of claim 6, wherein the urea production unit further comprises an agitation component having an end that extends into the dissolving tank to dissolve urea particles.

8. The direct urea injection system of claim 6, further comprising a dilution unit comprising a third pump and a mixer, one end of said mixer being connected to said dosing unit and the other end of said mixer being connected to said dispensing unit, one end of said third pump being adapted to be connected to a water supply, the other end of said third pump being located between said mixer and said dosing unit.

9. The direct urea injection system of any one of claims 1-8, further comprising a cooling unit coupled to each of the plurality of injectors.