A diesel generator set with scr aftertreatment device

Abstract

The utility model discloses a kind of SCR post-processing devices for diesel generating set, it includes: multiple groups of air intake components, each group of air intake components includes mixing pipe, air inlet elbow pipe being installed in one end of the mixing pipe and urea nozzle being installed at the connecting place of the mixing pipe and the air inlet elbow pipe, mixer SCR component is installed in the mixing pipe, the SCR component includes the SCR carrier tank being arranged in one side of multiple groups of the air intake components, first flow guide side cover is installed on one side of the SCR carrier tank and is connected with the other end of multiple the mixing pipe, and second flow guide side cover is installed on the other side of the SCR carrier tank, and gas outlet pipe is arranged on the second flow guide side cover. Make that exhaust gas of diesel generating set is collected together, through a port, exhaust to atmosphere, compact simple structure, low manufacturing cost.

Description

Technical Field

[0001] This utility model belongs to the field of diesel generator set aftertreatment technology, and relates to an SCR aftertreatment device for diesel generator sets. Background Technology

[0002] A diesel generator is a power machine that uses diesel fuel and a diesel engine as the prime mover to drive a generator to produce electricity. A complete unit generally consists of a diesel engine, generator, control box, fuel tank, starting and control batteries, protection devices, emergency cabinet, and other components. Diesel generator sets are increasingly widely used as backup power sources in various locations; however, their exhaust gases contain nitrogen oxides (NOx). x The levels of nitrogen oxides in diesel generator exhaust typically far exceed national emission standards. SCR (selective catalytic reduction) technology is the main technical approach to reducing nitrogen oxides in diesel generator exhaust.

[0003] Chinese utility model patent application number 201921367968.2 discloses an SCR catalytic reduction device for a diesel generator set, including a housing. A diesel generator set is fixedly connected to the inner cavity of the housing. An exhaust pipe is fixedly connected to the left end of the housing, and a blower is fixedly connected to one end of the exhaust pipe. An exhaust gas pipe is fixedly connected to one end of the diesel generator set, with one end of the exhaust gas pipe penetrating the right end of the housing and the other end penetrating a reaction chamber. An exhaust gas treatment box is located inside the reaction chamber. An electrolysis box is located on the right side of the exhaust gas treatment box, and a hydrogen collection box is located at the right end of the electrolysis box. An L-shaped gas pipe is fixedly connected to the top left side of the exhaust gas treatment box, with one end of the L-shaped gas pipe fixedly connected to an ammonia reaction chamber. This SCR catalytic reduction device for a diesel generator set requires the addition of a reaction chamber and a hydrogen collection box, resulting in a complex structure and high cost, making it difficult to implement in practice. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide an SCR aftertreatment device for diesel generator sets.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: an SCR aftertreatment device for diesel generator sets, comprising: Multiple sets of air intake components, each set of air intake components includes a mixing pipe, an air intake bend installed at one end of the mixing pipe, and a urea nozzle installed at the connection between the mixing pipe and the air intake bend, and a mixer is installed inside the mixing pipe; The SCR assembly includes an SCR carrier box disposed on one side of the multiple sets of intake assemblies, a first flow guide shroud mounted on one side of the SCR carrier box and connected to the other end of the multiple mixing pipes, and a second flow guide shroud mounted on the other side of the SCR carrier box, wherein an exhaust pipe is disposed on the second flow guide shroud.

[0006] Ideally, the first air intake side cover is provided with multiple air intake pipes, and each air intake pipe is connected to the mixing pipe at one end and the other end is connected to the mixing pipe.

[0007] Optimally, when the intake assembly consists of two sets, one set of intake bends is equipped with a flow sensor and the other set of intake bends is equipped with an intake end NO sensor. x sensor.

[0008] Furthermore, an outlet NO is installed on the outlet pipe. x sensor.

[0009] Furthermore, a differential pressure sensor is installed on the SCR carrier box, and a temperature sensor is installed inside each of the mixing tubes.

[0010] Furthermore, the centerlines of the two mixing pipes are parallel to each other, and the distance between the free ends of the two intake bends is less than the distance between the two mixing pipes.

[0011] Furthermore, the included angle α formed between the two intake bends is an acute angle, ranging from 30° to 60°.

[0012] Ideally, the cross-sectional area of ​​the first and second flow guide side covers in the vertical direction gradually decreases in the direction away from the SCR carrier box.

[0013] Furthermore, a drain pipe is installed at the bottom of the SCR carrier box and a lifting lug is installed at its top.

[0014] Due to the application of the above technical solutions, this utility model has the following advantages compared with the prior art: The SCR aftertreatment device for diesel generator sets of this utility model, by using the SCR component in conjunction with multiple sets of intake components, allows the exhaust gas of the diesel generator set to be collected together and discharged to the atmosphere through a single port. The structure is compact and simple, and the manufacturing cost is low. After the exhaust gas and urea (solution) are fully mixed, the exhaust gas passes through the SCR carrier, which helps to ensure that the exhaust gas reacts fully and reduces the nitrogen oxide content. Moreover, the urea nozzle is installed at the connection between the mixing pipe and the intake bend, which increases the injection distance and reduces the risk of urea crystallization. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the SCR aftertreatment device for diesel generator sets according to this utility model. Figure 1 The middle arrow points to the direction of the exhaust flow. Figure 2 for Figure 1 Top view; Figure 3 for Figure 1 Side view. Detailed Implementation

[0016] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0017] The following descriptions of embodiments are taken with reference to the accompanying drawings, illustrating specific embodiments in which this utility model can be implemented. Directional terms used in this utility model, such as "upper," "lower," "front," "rear," "left," "right," "inner," "outer," and "side," are merely for directional reference to the drawings. Therefore, the directional terms used are for illustration and understanding of this application, and not for limiting this application. Furthermore, in the specification, unless explicitly stated otherwise, the words "comprising" or "including" should be understood to mean including the element, but not excluding any other elements.

[0018] like Figures 1 to 3 The SCR aftertreatment device for the diesel generator set shown mainly includes an SCR assembly 2 and multiple intake assemblies 1.

[0019] The specific number of intake components 1 is usually determined according to the number of exhaust ports of the diesel generator set. For example, when the diesel generator set has two exhaust ports, there are also two intake components 1. Each intake component 1 includes a mixing pipe 11, an intake bend 12 installed at one end of the mixing pipe 11 (the other end of the intake bend 12 is usually connected to the exhaust port of the diesel generator set; the connection is preferably achieved with a loose flange, which can eliminate manufacturing tolerances to a certain extent, facilitates installation, and avoids re-welding on-site by the customer), and a urea nozzle 13 installed at the connection between the mixing pipe 11 and the intake bend 12 (this increases the injection distance and reduces the risk of urea crystallization). A mixer 111 is installed inside the mixing pipe 11 (this fully mixes the exhaust gas and urea (solution) before passing through the SCR component 2 (containing multiple SCR carriers, the specific number of SCR carriers can be conventionally selected according to actual needs), which helps to ensure that the exhaust gas reacts fully and reduces the nitrogen oxide content).

[0020] SCR assembly 2 includes an SCR carrier box 21 disposed on one side of multiple intake assemblies 1, a first guide side cover 22 installed on one side of the SCR carrier box 21 and connected to the other end of multiple mixing pipes 11, and a second guide side cover 23 installed on the other side of the SCR carrier box 21 (the sides of the first guide side cover 22 and the second guide side cover 23 are open to ensure smooth flow of exhaust gas), and an exhaust pipe 24 is provided on the second guide side cover 23.

[0021] By using the SCR component 2 in conjunction with multiple intake components 1, the exhaust gas of the diesel generator set is collected together and discharged into the atmosphere through a single outlet. The structure is compact, simple, and has low manufacturing cost.

[0022] In this embodiment, the first guide side cover 22 is provided with multiple air inlet pipes 221 (two in this embodiment), and the air inlet pipes 221 are connected one-to-one with the mixing pipe 11 at the other end; the connection here is also achieved by using loose flanges, which can eliminate manufacturing tolerances to a certain extent, facilitate installation, and avoid re-welding at the customer's site. When there are two sets of air inlet components 1, one set of air inlet bends 12 is equipped with a flow sensor 15 and the other set of air inlet bends 12 is equipped with an air inlet end NO. x Sensor 16, with an outlet NO installed on the outlet pipe 24 x Sensor 25; A controller can be added to connect to flow sensor 15, inlet NOx sensor 16, and outlet NOx sensor 25 respectively, so as to control the injection volume of urea.

[0023] In this embodiment, a differential pressure sensor 28 is also installed on the SCR carrier box 21 to monitor the usage of the SCR carrier; a temperature sensor is also installed in each mixing pipe 11 to monitor the temperature of the exhaust gas. The centerlines of the two mixing pipes 11 are parallel to each other, and the distance between the free ends of the two intake bends 12 is less than the distance between the two mixing pipes 11, so that the included angle α formed between the two intake bends 12 is an acute angle, which is 30~60°, to ensure the smooth input of exhaust gas from the diesel generator set.

[0024] In this embodiment, a drain pipe 27 is installed at the bottom of the SCR carrier box 21, and a lifting lug 26 is installed at the top. Inspection doors can also be installed on its other two sides for easy maintenance. The cross-sectional area of ​​the first guide side cover 22 and the second guide side cover 23 gradually decreases in the vertical direction away from the SCR carrier box 21. This can regulate the pressure of the exhaust gas to a certain extent, avoid turbulent exhaust gas flow, and thus improve the degree and uniformity of the catalytic reaction of the exhaust gas.

[0025] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. An SCR aftertreatment device for a diesel generator set, characterized in that, It includes: Multiple sets of air intake components (1), each set of air intake components (1) includes a mixing pipe (11), an air intake bend (12) installed at one end of the mixing pipe (11), and a urea nozzle (13) installed at the connection between the mixing pipe (11) and the air intake bend (12). A mixer (111) is installed inside the mixing pipe (11). SCR assembly (2), the SCR assembly (2) includes an SCR carrier box (21) disposed on one side of multiple sets of the intake assembly (1), a first flow guide side cover (22) installed on one side of the SCR carrier box (21) and connected to the other end of multiple mixing pipes (11), and a second flow guide side cover (23) installed on the other side of the SCR carrier box (21), the second flow guide side cover (23) being provided with an exhaust pipe (24).

2. The SCR aftertreatment device for diesel generator sets according to claim 1, characterized in that: The first flow guide side cover (22) is provided with a plurality of air inlet pipes (221), and the air inlet pipes (221) are connected to the mixing pipe (11) one by one at the other end.

3. The SCR aftertreatment device for diesel generator sets according to claim 1, characterized in that: When the intake assembly (1) consists of two sets, one set of the intake bends (12) is equipped with a flow sensor (15) and the other set of the intake bends (12) is equipped with an intake end NO sensor. x Sensor (16).

4. The SCR aftertreatment device for diesel generator sets according to claim 3, characterized in that: The outlet pipe (24) is equipped with an outlet NO. x Sensor (25).

5. The SCR aftertreatment device for diesel generator sets according to claim 4, characterized in that: A differential pressure sensor (28) is also installed on the SCR carrier box (21), and a temperature sensor is also installed in each of the mixing tubes (11).

6. The SCR aftertreatment device for diesel generator sets according to claim 3, characterized in that: The centerlines of the two mixing pipes (11) are parallel to each other, and the distance between the free ends of the two intake bends (12) is less than the distance between the two mixing pipes (11).

7. The SCR aftertreatment device for diesel generator sets according to claim 6, characterized in that: The included angle α formed between the two intake bends (12) is an acute angle, ranging from 30° to 60°.

8. The SCR aftertreatment device for diesel generator sets according to claim 1, characterized in that: The cross-sectional area of ​​the first flow guide side cover (22) and the second flow guide side cover (23) in the vertical direction gradually decreases in the direction away from the SCR carrier box (21).

9. The SCR aftertreatment device for diesel generator sets according to claim 1 or 8, characterized in that: The bottom of the SCR carrier box (21) is equipped with a drain pipe (27) and the top is equipped with a lifting lug (26).

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