Section 1: Uses and Product Features of Boiler Pipe Exhaust Muffler

The noise emitted by steam exhausts from thermal equipment such as boiler piping exhaust silencers far exceeds the values stipulated in China's "Noise Hygiene Standards for Industrial Enterprises" (refer to Appendices 1 and 2). Consequently, our factory's line of silencers is primarily designed for effective noise reduction of steam exhausts from thermal equipment such as boiler turbines in power generation, chemical, metallurgical, and textile industries. This series of steam silencers is developed based on the composite noise reduction principle of resistance, jet, and damping, featuring large noise reduction capacity, compact size, light weight, and easy installation. Depending on the application, there are several forms available:

Boiler Ignition Exhaust Muffler (TB) Type

To suppress the noise emitted by high-pressure gas flow, a variety of mufflers with different designs are already available worldwide. Most of them utilize multi-stage throttle pressure reduction. However, due to their complex structure, heavy weight, and difficulty in disassembly for maintenance, their application range has been limited. This structure's muffler overcomes these drawbacks.

This type of exhaust muffler is designed based on a comprehensive understanding of sound absorption principles. After high-pressure steam is once controlled within the muffler and then enters the pressure-reducing chamber, it is expanded in a large volume, forming low-pressure steam that is emitted. During this process, a portion of the steam's internal energy is converted into sound energy of a certain frequency. Although the noise power is greatly reduced, it often remains above the standard level due to reasons such as the exhaust deviating from the design value. To address this, a double-layered sound-insulating shield is designed around the pressure-reducing chamber, tailored to the frequency spectrum characteristics of the residual noise emitted by the chamber, to effectively absorb the remaining noise. After installation according to specifications, the total noise reduction should reach 36 to 42 decibels.

2. Steam Safety Valve Muffler (TA Type)

As is well-known, for safety valves of boilers and other thermal equipment, the exhaust steam should avoid excessive noise and ensure smooth ejection. Therefore, the commonly used methods such as multi-stage throttling and small-hole injection for noise reduction should not be adopted. This limitation has always been a design challenge for safety valve silencers and is also the reason for their poor noise reduction performance. The silencer used for safety valves also employs the noise reduction principle of resistance, injection, and obstruction, replacing the smaller diameter control flow holes with larger diameter holes for expansion, thereby strengthening the resistance, injection, and obstruction noise reduction mechanisms structurally. This achieves an ideal noise reduction effect.

3. Low-pressure Steam Silencer (Type TD)

A significant number of industrial and mining enterprises utilize low-pressure boilers with a pressure of 01.3MPa or less. In power plant thermal systems, there are also a large number of low-pressure thermal devices, such as back-pressure turbines, deaerators, auxiliary air blowers, turbine oil pumps, continuous boiler blowdown, periodic blowdown expanders, and more. The exhaust pipes of the aforementioned equipment require the installation of noise reduction mufflers that are lightweight in structure and easier to install. Our factory designs specialized deaerator series, back-pressure turbine series, and other product lines to cater to different noise reduction needs, ensuring they meet customer requirements.

The above exhaust muffler meets the requirements of the "Noise Hygiene Standards for Industrial Enterprises" and has been widely applied domestically.

For N3 type steam turbines, 20T/H low-pressure boiler superheater steam exhaust. Boiler pressure 13at, evaporation rate 20T/H, exhaust steam volume 10T/H.

Section 2: Boiler pipeline exhaust silencer product series and dimensions

Boiler Ignition Exhaust Muffler (TB Series for Superheated Steam)

2. Boiler muffler (for TA series superheated steam)

3. Boiler drum safety valve exhaust silencer (for TA series saturated steam use)

4. Back Pressure Turbine Exhaust Silencer (TDb Series)

5. High-pressure Deaerator Exhaust Muffler (TDy)

Section 3: Instructions for Ordering and Selection of Steam Pipe Exhaust Mufflers

Our steam exhaust silencer series is meticulously designed to meet the specific steam emission targets and requirements of our customers. To achieve optimal noise reduction, it is essential that the product aligns with the emission targets, steam parameters, and emission volume. Therefore, when ordering a silencer, the following parameters must be provided:

① Provide turbine model, boiler capacity, steam pressure, and temperature for thermal power plants.

② Application (such as for boiler superheat emissions or drum safety valve emissions, etc.)

③ Emission Rate T/H

④ Original exhaust pipe outer diameter, wall thickness.

⑤ If you require our factory to perform installation design, please provide the original exhaust pipe installation diagram.

For models not listed in the product manual, users can provide the relevant information mentioned above, and the factory will assist in selecting the appropriate model.

Four: Installation Instructions for Steam Pipe Exhaust Muffler

①The exhaust muffler should be installed vertically on the factory roof, and the muffler bracket should be secured to the factory with steel frame supports.

② To enhance the wind resistance of the factory building's roof height, the exhaust silencer body is equipped with a supporting bracket. Therefore, the exhaust pipe before the exhaust silencer should have a section of expansion bend to absorb thermal expansion. If a drain pan is already installed vertically on the original exhaust pipe section, the expansion bend should not be installed.

③ The bottom of each exhaust muffler is designed with a drain pipe or drain hole. The orifice should be checked for unobstructed flow.

④ The exhaust pipe should have a rain shield made of thin steel plate installed over the opening in the factory roof platform (as shown in Figure 3).

⑤ For safety doors, it is generally a practice to pair one safety door with one silencer. Safety doors are available in single and double seat models. For double seat models, the exhaust pipes can be combined into a single main pipe during installation, connecting to the silencer. However, for double seat safety doors with higher exhaust volume, installing two silencers is also an option.

⑥ The exhaust silencers for small capacity applications such as deaerators and steam jet vacuum pumps are designed in a tubular shape for easy installation. The installation method involves vertically mounting the exhaust silencers along the main workshop wall and columns. Type steel sliding brackets are set up on the wall and columns, with the silencer and pipeline mounted on them, with the exhaust outlet facing the roof direction. Note that the silencers are factory-fitted with fixed brackets, which can be omitted when using sliding bracket installation.

V. Application of Steam Pipe Exhaust Mufflers in Thermal Power Plants: