7MW Gas Turbine SCR Denitrification Project

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Hebei Hanlan successfully completed the acceptance of the SCR denitrification system for a 7MW gas turbine unit. The nitrogen oxide (NOx) emissions were reduced from the original level of NOx ≤ 500 mg/Nm³ (at 15% O₂ content) to the standard requirement of NOx ≤ 50 mg/Nm³ (at 15% O₂ content), with an ammonia slip rate of ≤ 3 ppm.

Project Name: AGT7B Gas Turbine Complete Unit Denitrification Project
Number of Units: 1
Unit Power: 7MW
Unit Model: AGT7B Gas Turbine

Performance: NOx emissions reduced from 500 mg/Nm³ to below 50 mg/Nm³

The entire SCR denitrification system, including installation, commissioning, and related services, was provided by Hebei Hanlan. This encompassed the design, manufacturing, transportation, installation guidance, commissioning, acceptance training, and after-sales support for various components such as the urea preparation system, denitrification reactor, dedicated denitrification catalyst, and control system. Since the project was delivered and officially put into operation, all system indicators have met the user's requirements, leading to a successful acceptance.

As the entire project area was classified as an explosion-proof zone, a 32.5% urea solution was used as the denitrification reducing agent. For this project, our company supplied a urea solution preparation system, including a feeder, preparation tank, filter, and water storage tank. The water produced by the water treatment equipment met the requirements for denitrification system use. The urea solution storage tank had sufficient capacity to support several days of continuous operation of the gas turbine and could provide real-time feedback on the consumption of the reducing agent in the tank.

It is important for the user to note that due to the large and complex nature of the gas turbine denitrification system, daily inspections are crucial to ensure safe and stable operation. For example:

Checking whether pumps and valves in each system are functioning properly.
Ensuring the feeder transmission and mixing tank rotation are operating normally.
Inspecting the entire system and tanks for leaks.

Monitoring the spray guns, pipelines, and catalyst for blockages, and performing timely cleaning or maintenance as required.

In particular, the denitrification catalyst can be affected by dust particles or pollutants in the flue gas. Fine particles may adhere to and clog the catalyst channels. If not cleaned promptly, this can lead to:

Restricted airflow, increasing system backpressure (higher than normal values).
Coverage of the catalyst channel surfaces and micropores, blocking contact between the flue gas and the catalyst, reducing catalyst activity and denitrification efficiency, and ultimately shortening the catalyst's lifespan. In severe cases, it may even cause catalyst failure.

Therefore, if the impact of fine particles in the flue gas is not addressed in time, the denitrification catalyst channels may become clogged again. Repeated occurrences of such issues could lead to catalyst failure and significant financial losses.

In summary, various problems may arise during the operation and use of the SCR denitrification system. It is essential to conduct daily inspections, perform timely cleaning and maintenance, and carefully investigate the root causes of any issues to prevent recurring problems. This approach avoids unnecessary expenditure of time, manpower, and resources, as well as more serious consequences.