CN216816025U

CN216816025U - Marine diesel tail gas SCR deNOx systems testing arrangement

Info

Publication number: CN216816025U
Application number: CN202123115744.2U
Authority: CN
Inventors: 张占虎; 黄汉龙; 高益多; 靖海国
Original assignee: CSSC Marine Power Zhenjiang Co Ltd
Current assignee: CSSC Marine Power Zhenjiang Co Ltd
Priority date: 2021-12-13
Filing date: 2021-12-13
Publication date: 2022-06-24
Anticipated expiration: 2031-12-13

Abstract

The utility model discloses a testing device for a tail gas SCR (selective catalytic reduction) denitration system of a marine diesel engine, which comprises an input tail gas testing straight pipe and a tail gas testing straight pipe after denitration, wherein a supercharger exhaust pipe is sequentially connected with the input tail gas testing straight pipe, the tail gas SCR denitration system and the tail gas testing straight pipe after denitration, the input tail gas testing straight pipe and the tail gas testing straight pipe after denitration are respectively connected with an emission analyzer through sample suction pipes, and the input tail gas testing straight pipe and the tail gas testing straight pipe after denitration are respectively connected with a temperature sensor, a pressure sensor and an NOX sensor in a bypass mode. The utility model can quickly and effectively test the matching performance of the marine diesel engine and the SCR, thereby ensuring that the tail gas emission of the marine diesel engine meets the relevant regulation requirements of the international maritime organization.

Description

Marine diesel tail gas SCR deNOx systems testing arrangement

Technical Field

The utility model relates to a device for testing tail gas of a marine diesel engine, in particular to a device for testing whether an SCR (selective catalytic reduction) denitration system of the tail gas of the marine diesel engine meets the latest emission regulations, and belongs to the technical field of post-treatment testing of tail gas of an internal combustion engine.

Background

In recent years, with the enforcement of Tier III emission regulations of the international maritime organization, more and more marine diesel engines are beginning to be additionally provided with an exhaust SCR (catalytic reduction) denitration device to reduce exhaust pollution, so as to meet the latest emission regulation requirements of the international maritime organization. However, the matching conditions of the existing marine diesel engine and the SCR are uneven, and the relevant external inspection requirements of the classification society cannot be met. The matching of the SCR denitration device and the marine diesel engine directly determines the performance of the marine diesel engine and influences the exhaust emission effect of the marine diesel engine. At present, the testing of the marine diesel engine additionally provided with the tail gas SCR denitration device mainly depends on a third-party testing mechanism, the testing device is complex in structure, time and labor are wasted when the testing device is assembled and disassembled, and the testing method is complex and poor in reliability.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a testing device for a tail gas SCR denitration system of a marine diesel engine, which is simple in structure and reliable in testing, and can quickly and effectively test the matching performance of the marine diesel engine and SCR.

The utility model is realized by the following technical scheme:

a testing device for a tail gas SCR (selective catalytic reduction) denitration system of a marine diesel engine comprises an input tail gas testing straight pipe and a tail gas testing straight pipe after denitration, wherein a supercharger exhaust pipe of the marine diesel engine is connected with the input end of the tail gas SCR denitration system through the input tail gas testing straight pipe, and the output end of the tail gas SCR denitration system is connected with the tail gas testing straight pipe after denitration; the first measuring pipe is vertically connected with the input end of the input tail gas testing straight pipe, and the second measuring pipe is vertically connected with the discharge end of the denitrated tail gas testing straight pipe; the first measuring tube and the second measuring tube are also respectively connected with the discharge analyzer through sample suction tubes; the input tail gas testing straight pipe is respectively connected with a first temperature sensor, a first pressure sensor and a first NOX sensor in a bypassing manner, the tail gas testing straight pipe after denitration is respectively connected with a second temperature sensor, a second pressure sensor, a second NOX sensor and an ammonia testing sensor in a bypassing manner, and the tail gas SCR denitration system is connected with a mass flow meter in a bypassing manner; signal lines of each temperature sensor, each pressure sensor and each NOX sensor, and signal lines of an ammonia test sensor, a mass flow meter and a diesel engine load signal sensor arranged on the marine diesel engine are respectively connected into corresponding channels of the PLC monitoring device; the upper computer is connected with the PLC monitoring device through Ethernet communication.

The purpose of the utility model is further realized by the following technical scheme:

further, the diameter D1 of the tail gas test straight pipe section and the diameter D2 of the tail gas test straight pipe after denitration are both larger than the diameter D of the supercharger outlet pipe of the marine diesel engine.

Further, the ratio of the distance L1 from the center of the first measuring pipe to the input end port of the exhaust SCR denitration system to the diameter d1 of the first measuring pipe is as follows: l1/d1 is more than 5, the distance from the output end of the exhaust SCR denitration system to the center of the second measuring tube is L2, and the ratio of the diameter d2 of the second measuring tube is as follows: l2/d2 > 10.

Furthermore, the temperature measuring ranges of the first temperature sensor and the second temperature sensor are both 0-600 ℃, the pressure measuring ranges of the first pressure sensor and the second pressure sensor are both 0-200 mbar, the testing ranges of the first NOX sensor and the second NOX sensor are both 0-2000 ppm, and the testing range of the ammonia sensor is 0-100 ppm.

According to the utility model, the two ends of the tail gas SCR denitration system of the marine diesel engine are respectively provided with the input tail gas test straight pipe and the tail gas test straight pipe after denitration, corresponding data before and after tail gas treatment are detected through the corresponding temperature sensor, pressure sensor and NOX sensor, and then the collected data are processed through the PLC monitoring device. The device has a simple and compact structure, can quickly and effectively test the matching performance of the marine diesel engine and the SCR, and promotes the performance matching of the marine diesel engine and the tail gas SCR denitration system to meet requirements, so that the tail gas emission of the marine diesel engine is ensured to meet the relevant regulation and control requirements of the international maritime organization.

The advantages and features of the utility model will be illustrated and explained by the following non-restrictive description of preferred embodiments, which are given by way of example only with reference to the accompanying drawings.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Detailed Description

The utility model is further illustrated by the following figures and examples.

As shown in fig. 1, the testing device for the tail gas SCR denitration system of the marine diesel engine of the present invention includes an input tail gas testing straight pipe 1 and a denitration tail gas testing straight pipe 2, a supercharger exhaust pipe 101 of the marine diesel engine 100 is connected to an input end of the tail gas SCR denitration system 20 through the input tail gas testing straight pipe 1, and an output end of the tail gas SCR denitration system 20 is connected to the denitration tail gas testing straight pipe 2. The first test tube 11 is vertically connected with the input end of the input tail gas test straight tube 1, and the second test tube 21 is vertically connected with the discharge end of the denitration tail gas test straight tube 2. The first measuring tube 11 and the second measuring tube 12 are also respectively connected with the emission analyzer 4 through the sample suction tube 3. The input tail gas test straight pipe 1 is respectively connected with a first temperature sensor 51, a first pressure sensor 61 and a first NOx sensor 71 in a bypassing mode, the denitrated tail gas test straight pipe 2 is respectively connected with a second temperature sensor 52, a second pressure sensor 62, a second NOx sensor 72 and an ammonia test sensor 8 in a bypassing mode, and the tail gas SCR denitration system 20 is connected with a mass flow meter 201 in a bypassing mode. Signal wires 301 of each temperature sensor, each pressure sensor and each NOX sensor, and signal wires 301 of an ammonia test sensor 8, a mass flow meter 9 and a diesel engine load signal sensor arranged on the marine diesel engine are respectively connected to corresponding channels of the PLC monitoring device 30; the upper computer 40 is connected with the PLC monitoring device 30 through ethernet communication.

The diameter D1 of the tail gas test straight pipe section and the diameter D2 of the denitrated tail gas test straight pipe are both larger than the diameter D of the supercharger outlet pipe of the marine diesel engine 100. The ratio of the distance L1 from the center of the first measuring tube 11 to the input end port of the exhaust gas SCR denitration system 20 to the diameter d1 of the first measuring tube: l1/d1 is more than 5, the distance between the output end of the exhaust SCR denitration system 20 and the center of the second measuring pipe 21 is L2, and the ratio of the diameter d2 of the second measuring pipe 21 is as follows: l2/d2 > 10.

The temperature measuring ranges of the first temperature sensor 51 and the second temperature sensor 52 are both 0-600 ℃, the pressure measuring ranges of the first pressure sensor 61 and the second pressure sensor 62 are both 0-200 mbar, the testing ranges of the first NOX sensor 71 and the second NOX sensor 72 are both 0-2000 ppm, and the testing range of the ammonia sensor 8 is 0-100 ppm.

The testing requirements and the testing process of the testing device for the tail gas SCR denitration system of the marine diesel engine are as follows:

1) and respectively carrying out load working condition tests according to the proportional load, firstly carrying out 100% load working condition tests of 100 rated power of the marine diesel engine after the marine diesel engine 100 stably runs for more than 20 minutes, and then respectively carrying out load working condition tests according to 75%, 50%, 25% and 10% proportional loads of the 100 rated power of the marine diesel engine in sequence.

2) In each proportional load working condition test, the exhaust emission data before and after denitration of the marine diesel engine 100 is respectively measured through the emission analyzer 4, the exhaust emission data is contrasted and analyzed through the PLC monitoring device 30, NOX data of a first NOX sensor 71 in front of the input end of the exhaust SCR denitration system 20 and NOX data of a second NOX sensor 72 behind the output end of the exhaust SCR denitration system 20 are respectively collected, and the change condition of NOX emission is analyzed; simultaneously, the input end temperature of the tail gas SCR denitration system 20 detected by the first temperature sensor 51 and the output end temperature of the tail gas SCR denitration system 20 detected by the second temperature sensor 52 are respectively collected, the input end pressure of the tail gas SCR denitration system 20 detected by the first pressure sensor 51 and the output end pressure of the tail gas SCR denitration system 20 detected by the second pressure sensor 52 are respectively collected, and the difference between the input end pressure and the output end pressure is pressure loss. The difference between the amount of ammonia at the input end of the exhaust gas SCR denitration system 20 detected by the first NOX sensor 71 and the amount of ammonia at the output end of the exhaust gas SCR denitration system 20 detected by the second NOX sensor 72 is the ammonia slip amount. The mass flow meter 201 detects the urea injection amount of the exhaust SCR denitration system 20.

3) The PLC monitoring device 30 calculates the denitration efficiency of each working condition of the exhaust SCR denitration system 20 in a weighted manner for the collected data, and determines whether the requirements of the Tier III emission regulations of the international maritime organization are satisfied, thereby completing the test of the exhaust emission effect of the marine diesel engine.

The recommended reaction temperature of the tail gas SCR denitration system 20 in the step 3) is 260-530 ℃; the pressure difference of the input end and the output end of the tail gas SCR denitration system 20 is not more than 30mbar, and the ammonia escape amount of the difference between the ammonia amount of the input end and the ammonia amount of the output end of the tail gas SCR denitration system 20 is not more than 10 PPm.

In addition to the above embodiments, the present invention may have other embodiments, and any technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of the claims of the present invention.

Claims

1. The utility model provides a marine diesel tail gas SCR deNOx systems testing arrangement which characterized in that: the device comprises an input tail gas test straight pipe and a denitrated tail gas test straight pipe, wherein a supercharger exhaust pipe of the marine diesel engine is connected with the input end of a tail gas SCR denitration system through the input tail gas test straight pipe, and the output end of the tail gas SCR denitration system is connected with the denitrated tail gas test straight pipe; the first measuring pipe is vertically connected with the input end of the input tail gas testing straight pipe, and the second measuring pipe is vertically connected with the discharge end of the denitrated tail gas testing straight pipe; the first measuring tube and the second measuring tube are also respectively connected with the discharge analyzer through sample suction tubes; the input tail gas testing straight pipe is respectively connected with a first temperature sensor, a first pressure sensor and a first NOX sensor in a bypassing manner, the tail gas testing straight pipe after denitration is respectively connected with a second temperature sensor, a second pressure sensor, a second NOX sensor and an ammonia testing sensor in a bypassing manner, and the tail gas SCR denitration system is connected with a mass flow meter in a bypassing manner; signal lines of each temperature sensor, each pressure sensor and each NOX sensor, and signal lines of an ammonia test sensor, a mass flow meter and a diesel engine load signal sensor arranged on the marine diesel engine are respectively connected into corresponding channels of the PLC monitoring device; the upper computer is connected with the PLC monitoring device through Ethernet communication.

2. The marine diesel engine tail gas SCR deNOx systems testing arrangement of claim 1, characterized by: and the diameter D1 of the tail gas test straight pipe section and the diameter D2 of the denitrated tail gas test straight pipe are both larger than the diameter D of the outlet pipe of the supercharger of the marine diesel engine.

3. The marine diesel engine tail gas SCR deNOx systems testing arrangement of claim 1, characterized by: the ratio of the distance L1 from the center of the first measuring tube to the input end port of the tail gas SCR denitration system to the diameter d1 of the first measuring tube: l1/d1 is more than 5, the distance between the output end of the tail gas SCR denitration system and the center of the second measuring tube is L2, and the ratio of the diameter d2 of the sample suction tube of the second measuring tube is as follows: l2/d2 > 10.

4. The marine diesel engine tail gas SCR deNOx systems testing arrangement of claim 1, characterized by: the temperature measuring range of the first temperature sensor and the temperature measuring range of the second temperature sensor are both 0-600 ℃, the pressure measuring range of the first pressure sensor and the pressure measuring range of the second pressure sensor are both 0-200 mbar, the testing range of the first NOX sensor and the testing range of the second NOX sensor are both 0-2000 ppm, and the testing range of the ammonia sensor is 0-100 ppm.