CN221198958U - General fixed frock of SCR and engine matching test - Google Patents

Abstract

The utility model relates to a universal fixing tool for an SCR and engine matching test, and belongs to the technical field of engine testing. The universal fixing tool comprises a smoke exhaust reducing pipe, a first smoke exhaust bent pipe, a mixing pipe, an SCR inlet smoke exhaust bent pipe, an SCR inlet reducing pipe, an SCR to-be-tested, an SCR outlet reducing pipe and an SCR outlet smoke exhaust bent pipe which are sequentially connected from an engine outlet, wherein the first smoke exhaust bent pipe, the SCR inlet smoke exhaust bent pipe and the SCR outlet smoke exhaust bent pipe are universal parts; the smoke exhaust reducing pipe is matched with the engine, and the SCR inlet reducing pipe and the SCR outlet reducing pipe are matched with the SCR to be tested. Under the fixed condition of the selected engine, the assembly can be realized by selecting different SCR inlet reducing pipes and SCR outlet reducing pipes according to different types of SCR to be tested, so that the universal fixing tool for the matching test, which is suitable for the matching installation of different types of SCR and the engine, is small in occupied space, convenient to install and low in cost, is provided.

Description

General fixed frock of SCR and engine matching test

Technical Field

The utility model relates to the technical field of engine tests, in particular to the technical field of mounting and fixing devices before engine tests, and specifically relates to a universal fixing tool for an SCR and engine matching test.

Background

In general, in the field of ship engine manufacturing, a test of relevant emissions needs to be performed between tests to verify whether the matching of SCR (SELECTIVE CATALYTIC Reduction) with an engine meets relevant technical requirements.

Before testing, it is first necessary to install a stationary engine and SCR, and for diesel engines of the W32 and W34 type, for example, the machine model and the external dimensions have been determined and the test room has been designed for these types. When the engine is matched with the SCRs of different manufacturers, the approximate size of the SCRs matched with the engine model is determined because the engine model is determined and the exhaust gas flow data is also determined. Because the requirements of different manufacturers or shipyards on the sizes of the SCR interfaces are different, the sizes of the feet, the smoke exhaust inlets and outlets and the like of the SCR are different. If the smoke exhaust pipe is arranged for SCR of each manufacturer model, the material cost is high, the occupied space is large, and the installation time is long.

Therefore, how to provide a universal fixing tool suitable for matching installation of different types of SCR and engine, which has small occupied space, convenient installation and low cost, becomes a problem to be solved urgently.

Disclosure of utility model

The utility model aims to overcome the defects in the prior art, and provides the universal fixing tool for the SCR and engine matching test, which is suitable for matching installation of different types of SCRs and engines, and has the advantages of small occupied space, convenient installation and low cost.

In order to achieve the above object, the universal fixing tool for the SCR and engine matching test of the present utility model has the following constitution:

the universal fixing tool for the SCR and engine matching test comprises a smoke exhaust reducing pipe, a first smoke exhaust bent pipe, a mixing pipe, an SCR inlet smoke exhaust bent pipe, an SCR inlet reducing pipe, an SCR inlet of the SCR, an SCR outlet reducing pipe and an SCR outlet smoke exhaust bent pipe, wherein the smoke exhaust reducing pipe, the first smoke exhaust bent pipe, the mixing pipe, the SCR inlet smoke exhaust bent pipe and the SCR inlet reducing pipe are sequentially connected from an engine outlet to an inlet of the SCR to be tested, and the SCR outlet reducing pipe and the SCR outlet smoke exhaust bent pipe are sequentially connected from an outlet of the SCR to be tested, wherein the first smoke exhaust bent pipe, the SCR inlet smoke exhaust bent pipe and the SCR outlet smoke exhaust bent pipe are universal parts; the exhaust reducing pipe is matched with the engine, and the SCR inlet reducing pipe and the SCR outlet reducing pipe are matched with the SCR to be tested.

The universal fixing tool for the SCR and engine matching test further comprises an SCR inlet smoke discharging elbow support, an SCR fixing support and an SCR outlet smoke discharging elbow support, wherein the engine is fixed at one end of the test room ground rail, and the SCR inlet smoke discharging elbow, the SCR to be tested and the SCR outlet smoke discharging elbow are respectively and correspondingly fixed on the test room ground rail through the SCR inlet smoke discharging elbow support, the SCR fixing support and the SCR outlet smoke discharging elbow support.

In the universal fixing tool for the SCR and engine matching test, the first smoke discharging bent pipe is communicated with the front end of the mixing pipe sequentially through the first corrugated pipe and the mixing pipe inlet reducing pipe.

In the universal fixing tool for the SCR and engine matching test, the size of the first smoke discharging bent pipe meets the back pressure requirement under the full-load working condition of the maximum power engine, and the mixing pipe inlet reducing pipe is matched with the first smoke discharging bent pipe and the mixing pipe.

In the universal fixing tool for the SCR and engine matching test, the SCR inlet smoke exhaust bent pipe is connected with the SCR inlet reducing pipe through a second corrugated pipe, and the SCR outlet reducing pipe is connected with the SCR outlet smoke exhaust bent pipe through a third corrugated pipe.

In the universal fixing tool for the SCR and engine matching test, the second corrugated pipe is communicated with the straight pipe section with the length of not less than 1 meter formed by the reducing pipe at the inlet of the SCR.

In the universal fixing tool for the SCR and engine matching test, a guide vane is arranged in the SCR inlet smoke discharging bent pipe.

The universal fixing tool for the SCR and engine matching test further comprises a test room smoke exhaust pipe, the SCR outlet smoke exhaust bent pipe is communicated with the test room smoke exhaust pipe through a telescopic pipe, and a discharge test sampling port is arranged at the test room smoke exhaust pipe.

The universal fixing tool for the SCR and engine matching test further comprises a Y-shaped pipe, wherein an inlet of the Y-shaped pipe is connected with the SCR inlet smoke discharging bent pipe, one outlet of the Y-shaped pipe is communicated with the SCR to be tested through the SCR inlet reducing pipe, and the other outlet of the Y-shaped pipe is communicated with the SCR to be tested through the SCR bypass valve.

The universal fixing tool for the SCR and engine matching test further comprises a urea tank, a pump unit, an injection unit and a PLC control cabinet, wherein the urea tank is communicated with the injection unit through the pump unit, the injection unit is connected with the mixing pipe, the PLC control cabinet is connected with the pump unit and the injection unit, and the injection unit is controlled to inject urea into the mixing pipe.

The utility model is adopted. The universal fixing tool for the SCR and engine matching test comprises a smoke discharging reducing pipe, a first smoke discharging bent pipe, a mixing pipe, an SCR inlet smoke discharging bent pipe, an SCR inlet reducing pipe, an SCR to-be-tested, an SCR outlet reducing pipe and an SCR outlet smoke discharging bent pipe which are sequentially connected from an engine outlet, wherein the first smoke discharging bent pipe, the SCR inlet smoke discharging bent pipe and the SCR outlet smoke discharging bent pipe are universal parts; the exhaust reducing pipe is matched with the engine, and the SCR inlet reducing pipe and the SCR outlet reducing pipe are matched with the SCR to be tested. Under the fixed condition of the selected engine, the assembly can be realized by selecting different SCR inlet reducing pipes and SCR outlet reducing pipes according to different types of SCR to be tested, so that the universal fixing tool for the matching test, which is suitable for the matching installation of different types of SCR and the engine, is small in occupied space, convenient to install and low in cost, is provided.

Drawings

FIG. 1 is a schematic diagram of a general fixing tool for an SCR and engine matching test.

Fig. 2 is a schematic diagram of a working platform structure of a back test room of a universal fixing tool for an SCR and engine matching test of the present utility model.

FIG. 3 is a schematic diagram of a general fixing tool with bypass function for SCR and engine matching test.

Description of the reference numerals:

The device comprises a smoke discharging reducing pipe 1, a first smoke discharging bent pipe 2, a first corrugated pipe 3, a mixing pipe inlet reducing pipe 4, an SCR inlet smoke discharging bent pipe 5, a second corrugated pipe 6, an SCR inlet reducing pipe 7, an SCR outlet reducing pipe 8, a third corrugated pipe 9, an SCR outlet smoke discharging bent pipe 10, an SCR fixing support 11, an SCR 12 to be tested, a mixing pipe 13, an engine 14, an SCR inlet smoke discharging bent pipe support 15, an SCR outlet smoke discharging bent pipe support 16, a ground rail 17, a test room smoke discharging pipe 18, a discharge test sampling port 19, a Y-shaped pipe 20, a urea tank 21, a pump unit 22, an injection unit 23, a PLC control cabinet 24, a test room platform 25 and a sensor junction box 26.

Detailed Description

In order to make the technical contents of the present utility model more clearly understood, the following examples are specifically described.

Referring to fig. 1, a schematic structure diagram of a universal fixture for a matching test of an SCR and an engine according to the present utility model is shown.

In one embodiment, the universal fixture for the SCR and engine matching test comprises a smoke discharging reducing pipe 1, a first smoke discharging bent pipe 2, a mixing pipe 13, an SCR inlet smoke discharging bent pipe 5 and an SCR inlet reducing pipe 7 which are sequentially connected from an outlet of an engine 14 to an inlet of an SCR 12 to be tested, and further comprises an SCR outlet reducing pipe 8 and an SCR outlet smoke discharging bent pipe 10 which are sequentially connected from an outlet of the SCR 12 to be tested. Wherein, the first smoke exhaust elbow 2, the SCR inlet smoke exhaust elbow 5 and the SCR outlet smoke exhaust elbow 10 are universal parts; the smoke discharging reducing pipe 1 is matched with the engine; only the SCR inlet reducer 7 and the SCR outlet reducer 8 match the SCR 12 to be tested. Under the condition that the engine 14 is selected, different SCR 12 is matched only by selecting different SCR inlet reducing pipes 7 and SCR outlet reducing pipes 8, and other components on the fixing tool are universal parts and are not required to be replaced, so that the universal fixing tool which is universally used for various SCRs and performs a matching test with the engine is realized.

Further, the universal fixing tool for the SCR and engine matching test further comprises an SCR inlet smoke discharging elbow bracket 15, an SCR fixing bracket 11 and an SCR outlet smoke discharging elbow bracket 16. The engine 14 is fixed to one end of the test room rail 17. The SCR inlet smoke discharging elbow 5 and the SCR outlet smoke discharging elbow 10 are respectively and correspondingly fixed on the test room ground rail 17 through the SCR inlet smoke discharging elbow bracket 15 and the SCR outlet smoke discharging elbow bracket 16, thereby ensuring the long-term stable fixation of the general pipeline part. The SCR 12 to be tested corresponds to the SCR fixing support 11, and when different SCR 12 are replaced, the SCR fixing support 11 is only required to be detached and replaced, when the size of the SCR is adjusted, the position of the SCR fixing support 11 can be correspondingly adjusted, and the SCR fixing support 11 can be replaced according to actual needs.

In a preferred embodiment, the first smoke evacuation elbow 2 is communicated with the front end of the mixing pipe 13 sequentially through the first corrugated pipe 3 and the mixing pipe inlet reducing pipe 4. The first smoke evacuation elbow 2 has a size that meets the back pressure requirement under the full-load working condition of the maximum power engine, for example, the back pressure is 5Kpa when a W32 type diesel engine is adopted, and the back pressure is 6Kpa when a W34 type diesel engine is adopted. The mixing pipe inlet reducing pipe 4 is matched with the first smoke discharging bent pipe 2 and the mixing pipe 13.

The SCR inlet smoke discharging elbow 5 is connected with the SCR inlet reducing pipe 7 through the second corrugated pipe 6, and the SCR outlet reducing pipe 8 is connected with the SCR outlet smoke discharging elbow 10 through the third corrugated pipe 9. The second corrugated pipe 6 is communicated with the SCR inlet reducing pipe 7 to form a straight pipe section with the length not smaller than 1 meter. And a deflector (not shown in the figure) is arranged in the SCR inlet smoke exhaust elbow 5.

In a further preferred embodiment, the universal fixture for the matching test of the SCR and the engine further comprises a test room smoke exhaust pipe 18, the SCR outlet smoke exhaust elbow 10 is communicated with the test room smoke exhaust pipe 18 through a telescopic pipe (not shown in the figure), and an emission test sampling port 19 is arranged at the test room smoke exhaust pipe 18.

In a further preferred embodiment, the universal fixture for the matching test of the SCR and the engine further comprises a Y-shaped pipe 20, wherein an inlet of the Y-shaped pipe 20 is connected with the SCR inlet smoke exhaust elbow 5, one outlet of the Y-shaped pipe 20 is communicated with the SCR 12 to be tested through the SCR inlet reducing pipe 7, and the other outlet is communicated with the SCR 12 to be tested through an SCR bypass valve (not shown in the figure).

In a more preferred embodiment, the universal fixture for the SCR and engine matching test further comprises a urea tank 21, a pump unit 22, an injection unit 23 and a PLC control cabinet 24, wherein the urea tank 21 is communicated with the injection unit 23 through the pump unit 22, the injection unit 23 is connected to the mixing pipe 13, and the PLC control cabinet 24 is connected with the pump unit 22 and the injection unit 23 and controls the injection unit 23 to inject urea into the mixing pipe 13.

In practical application, the universal fixing tool for matching the SCR and the engine comprises a diesel engine smoke exhaust outlet reducing pipe 1; smoke evacuation elbow 2DN800; bellows 3DN800; a mixing pipe inlet reducing pipe 4; SCR inlet exhaust elbow 5DN800 and bracket 15; bellows 6DN800; an SCR inlet reducing pipe 7; an SCR outlet reducer 8; bellows 9DN800; SCR outlet smoke exhaust 10DN800 and bracket 16 thereof; an SCR fixing bracket 11; and ground rail 17, etc.

Wherein: the diesel engine smoke outlet reducing pipe 1 is manufactured independently according to different engine types; DN800 smoke discharging elbow 2 is fixed and universal for all models; bellows 3, 6, 9DN800 are common to all SCR; the mixing pipe inlet reducing pipe 4 can be independently manufactured according to SCR with different sizes; the SCR inlet bent pipe 5 and the bracket 15 thereof are fixed and are universal for all types of SCR; the SCR inlet reducing pipe 7 is independently manufactured according to SCRs with different sizes; the SCR outlet reducing pipe 8 is independently manufactured according to SCRs with different sizes; the exhaust pipe 10 of the SCR outlet and the bracket 16 are universal in all types, and the SCR outlet is connected with the exhaust pipe 18 of the test room through a telescopic pipe (1-3 m) with adjustable distance; the SCR fixing bracket 11 is adjusted in position or separately manufactured according to different sizes of SCRs 12.

Therefore, it can be found that for different types of SCR, only few small-size pipelines such as the SCR inlet reducing pipe 7, the SCR outlet reducing pipe 8 and the like need to be manufactured independently, and the SCR fixing support only needs to be adjusted in position under the condition that the difference of the SCR is not great. Under the condition of determining the engine model, the reducing pipe of the exhaust outlet of the diesel engine does not need to be adjusted. The other parts are all universal parts. The smoke exhaust pipes 2, 5, 9 and 10 and the brackets 11, 15 and 16 are universal, so that the installation is more convenient, and the repeated installation is not required after one-time arrangement. The SCR with different types is tested in the testing room, so that the processing cost and the time cost are greatly saved.

In the present utility model, it is to be understood that the emissions verification test should be designed to meet the requirements for SCR and machine placement, including in particular the following:

1. The diesel engine is arranged to meet the requirements of the crane lifting distance and the connection of pipelines between tests.

The dimensions of the type 6 cylinder, 8\9 cylinder models of the W32 and W34 type are considered. After field measurements, the engine 14 is arranged at the end, so that sufficient space is available for the arrangement of the SCR 12 and the smoke exhaust pipe 2. Meanwhile, the limit position of the crane lifting machine can be met.

The elbow of the smoke evacuation tube 2 can be rotated so as to be consistent with the outlet of the engine 14

The smoke evacuation brackets 15, 16 and the SCR bracket 11 are fixed to the floor rail 17 between tests by T-bolts, and can be adjusted on the floor rail 17 to eliminate field installation errors.

2. The smoke exhaust pipe is arranged so that the allowable back pressure (W32 is 5Kpa and W34 is 6 Kpa) cannot be exceeded under the condition of full load of the diesel engine.

The design is carried out according to the maximum power model, the size of the smoke exhaust pipe is calculated according to the maximum model exhaust gas amount, after the back pressure of the maximum model meets the requirement, the sizes of the smoke exhaust pipes 2, 5, 9 and 10 are fixed, and the later small power models are connected by adjusting the reducing pipes 4, 7 and 8. Therefore, the test of different machine types with different sizes can be met by matching one set of smoke exhaust pipes 2, 5, 9 and 10 with different reducing pipes 4, 7 and 8.

After the arrangement of the engine 14 and the SCR 12 is determined, the smoke exhaust pipes 2, 5, 9, 10 are subjected to fluid analysis by fluid analysis software to obtain the proper size of the pipe arrangement, and then the calculation and analysis are performed to obtain the final sum of the back pressures of the equipment and the pipes (the smoke exhaust pipes 2, 5, 10, the reducing pipes 4, 7, 8, the corrugated pipes 3, 6, 9, the SCR 12, the mixing pipe 13 and the smoke exhaust pipe from the test room to the chimney outlet).

3. The length of the straight pipe between the outlet of the mixing pipe 13 and the inlet of the SCR 12 is ensured to ensure that the urea and the waste gas are fully mixed.

The inlet of the mixing tube 13 to the SCR 12 requires at least 1 meter of straight tube sections, which may not be met if a high power model is required and additional external smoke evacuation tubes and supports are required. Through fluid software analysis, a guide vane is added at the position of the SCR inlet smoke discharging bent pipe 5 so as to ensure the full mixing of waste gas and urea, and through simulation analysis, the mixing degree meets the requirement after the guide vane is added. Therefore, the requirements of all types can be met by adding the guide vane, and the pipelines and the brackets are not required to be additionally increased or decreased, so that the pipelines are ensured to be universal.

4. The emissions test sampling port 19 is required to meet regulatory requirements (at least 10 pipe diameters after the engine 14 exit and at least 3 pipe diameters before the stack is vented to atmosphere).

The sampling port 19 is arranged at the smoke exhaust pipe 18 between tests, the pipe diameter DN900 is a distance of 14 meters from the outlet of the engine 14, a distance of 30 meters from a smoke exhaust pipe chimney (not shown in the figure), the requirements are fully met, and the smoke exhaust pipe 18 between tests has a single platform, so that the installation and the test of the sampling equipment are safe and convenient, and the time is saved.

5. The class society requires separate measurements of diesel emissions and emissions after SCR operation.

As shown in FIG. 1, the SCR 12 without bypass can be implemented by a test procedure that measures the raw emission data of the diesel engine when the SCR is not spraying urea, and measures the processed emission data after the SCR works.

For an SCR with bypass function as shown in fig. 3, emission measurements of diesel and SCR operation are achieved by opening and closing the bypass valve of the SCR.

6. The exhaust pipe needs to ensure sufficient margin for thermal expansion of the pipe.

As shown in fig. 1, the outlet of the engine 14, the inlet and outlet of the mixing pipe 13 and the inlet and outlet of the SCR 12 are provided with corrugated pipes 3, 6 and 9 to ensure enough expansion allowance and ensure that the equipment cannot deform due to heat.

7. The distance from the urea tank 21 to the pump unit 22 is controlled within 10 meters, the distance from the pump unit 22 to the injection unit 23 is controlled within 10 meters, and the distance from the injection unit 23 to the mixing pipe 13 is controlled within 5 meters, taking into account the flow loss of the piping and the lift of the pump unit 22.

As shown in fig. 2, the urea tank 21, the pump unit 22, the injection unit 23, and the PLC control cabinet 24 are all installed in the test room with a pipe distance of less than 3 meters. The PLC control cabinet 24 and the injection unit 23 are arranged on the test room platform 25, so that the debugging work of the site SCR is safer and more convenient, and the debugging time is saved. Furthermore, the spraying unit 23 and the mixing pipe 13 are connected by stainless steel metal, so that the installation is convenient and the arrangement is simple. The capacity of the urea tank 21 is such that it is not necessary to add a capacity that satisfies the 16 hours of continuous testing, thereby ensuring that the test time requirements are fully met.

8. SCR temperature differential pressure, NOX sensor needs to be connected to PLC cabinet nearby.

As shown in fig. 2, the distance between the sensor junction box 26 and the PLC control cabinet 24 is within 5 meters, and a high temperature region is avoided, so that signals are not disturbed, debugging faults are reduced, and debugging time is saved.

9. The SCR with bypass function needs to meet the conditions for testing the bypass function.

As shown in fig. 3, the same smoke evacuation tube 2, 5, 9, 10 and brackets 11, 15, 16 are adapted to different modes by mounting a Y-tube 20 and inlet valve (not shown).

In conclusion, the universal fixing tool for the SCR and engine matching test can be suitable for mounting of SCRs of different types, so that equipment cost is reduced, occupied space of the equipment is reduced, the design is ingenious, the structure is simple, the manufacturing is simple and convenient, the cost is low, and the universal fixing tool is suitable for large-scale popularization and application.

The utility model is adopted. The universal fixing tool for the SCR and engine matching test comprises a smoke discharging reducing pipe, a first smoke discharging bent pipe, a mixing pipe, an SCR inlet smoke discharging bent pipe, an SCR inlet reducing pipe, an SCR to-be-tested, an SCR outlet reducing pipe and an SCR outlet smoke discharging bent pipe which are sequentially connected from an engine outlet, wherein the first smoke discharging bent pipe, the SCR inlet smoke discharging bent pipe and the SCR outlet smoke discharging bent pipe are universal parts; the exhaust reducing pipe is matched with the engine, and the SCR inlet reducing pipe and the SCR outlet reducing pipe are matched with the SCR to be tested. Under the fixed condition of the selected engine, the assembly can be realized by selecting different SCR inlet reducing pipes and SCR outlet reducing pipes according to different types of SCR to be tested, so that the universal fixing tool for the matching test, which is suitable for the matching installation of different types of SCR and the engine, is small in occupied space, convenient to install and low in cost, is provided.

In this specification, the utility model has been described with reference to specific embodiments thereof. It will be apparent that various modifications and variations can be made without departing from the spirit and scope of the utility model. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.

Claims (10)

1. A universal fixing tool for the matching test of SCR and engine is composed of the smoke discharging reducing pipe, the first smoke discharging elbow pipe, mixing pipe, the SCR inlet smoke discharging elbow pipe, the SCR inlet reducing pipe, the SCR outlet reducing pipe and the SCR outlet smoke discharging elbow pipe,

Wherein, the first smoke exhaust bent pipe, the SCR inlet smoke exhaust bent pipe and the SCR outlet smoke exhaust bent pipe are universal parts; the exhaust reducing pipe is matched with the engine, and the SCR inlet reducing pipe and the SCR outlet reducing pipe are matched with the SCR to be tested.

2. The universal fixture for the SCR and engine matching test according to claim 1, further comprising an SCR inlet smoke-discharging elbow bracket, an SCR fixing bracket and an SCR outlet smoke-discharging elbow bracket,

The engine is fixed at one end of the test room ground rail, and the SCR inlet smoke exhaust bent pipe, the SCR to be tested and the SCR outlet smoke exhaust bent pipe are respectively and correspondingly fixed on the test room ground rail through the SCR inlet smoke exhaust bent pipe bracket, the SCR fixing bracket and the SCR outlet smoke exhaust bent pipe bracket.

3. The universal fixing tool for the SCR and engine matching test of claim 2, wherein the first smoke discharging bent pipe is communicated with the front end of the mixing pipe sequentially through the first corrugated pipe and the mixing pipe inlet reducing pipe.

4. The universal fixing tool for the SCR and engine matching test of claim 3, wherein the first smoke exhaust elbow has a size meeting the back pressure requirement under the full-load working condition of the maximum power engine, and the mixing pipe inlet reducing pipe is matched with the first smoke exhaust elbow and the mixing pipe.

5. The universal fixing tool for the SCR and engine matching test of claim 2, wherein the SCR inlet smoke exhaust elbow is connected with the SCR inlet reducing pipe through a second corrugated pipe, and the SCR outlet reducing pipe is connected with the SCR outlet smoke exhaust elbow through a third corrugated pipe.

6. The universal fixing tool for the SCR and engine matching test of claim 5, wherein the second corrugated pipe is communicated with the straight pipe section with the length of not less than 1 meter formed by the reducing pipe at the inlet of the SCR.

7. The universal fixing tool for the SCR and engine matching test of claim 6, wherein a guide vane is arranged in the SCR inlet smoke exhaust elbow.

8. The universal fixing tool for the SCR and engine matching test of claim 1, further comprising a test room smoke exhaust pipe, wherein the SCR outlet smoke exhaust elbow is communicated with the test room smoke exhaust pipe through a telescopic pipe, and an emission test sampling port is arranged at the test room smoke exhaust pipe.

9. The universal fixture for the SCR and engine matching test of claim 1, further comprising a Y-shaped pipe, wherein an inlet of the Y-shaped pipe is connected with the SCR inlet smoke exhaust elbow, one outlet of the Y-shaped pipe is communicated with the SCR to be tested through the SCR inlet reducing pipe, and the other outlet of the Y-shaped pipe is communicated with the SCR to be tested through an SCR bypass valve.

10. The universal fixture for the SCR matching test of any one of claims 1 to 9, further comprising a urea tank, a pump unit, an injection unit and a PLC control cabinet, wherein the urea tank is communicated with the injection unit through the pump unit, the injection unit is connected to the mixing pipe, the PLC control cabinet is connected with the pump unit and the injection unit, and controls the injection unit to inject urea into the mixing pipe.