1、 Application of boiler silencer:

The noise emitted by steam emissions from thermal equipment such as boiler exhaust far exceeds the values specified in China's "Industrial Enterprise Boundary Environmental Noise Emission Standards" (see appendix). For this purpose, boiler silencers are mainly used to effectively reduce steam emissions from thermal equipment such as boilers and turbines in industrial sectors such as power generation, chemical, metallurgical, and textile industries. This boiler muffler is developed based on the principle of composite noise reduction of resistance, spray, and resistance, and has the advantages of large noise reduction, small size, light weight, and easy installation. According to different purposes, there are several forms as follows:

two、Principle of boiler silencer:

    The boiler exhaust muffler is mainly based on the theory of "small hole injection" and the principle of impedance expansion sound absorption. The steam emission from the boiler generally has a fast flow rate and high airflow noise, so it needs to be expanded through a through-hole first. After passing through multiple perforations, the steam in the resistance expansion chamber is depressurized and reduced in flow. The airflow is then sprayed out through small holes, and the sound power of each octave band is reduced after spraying. The frequency of the sound pressure level is pushed up to above 20000Hz, and its noise is greatly reduced. However, some secondary noise at certain frequencies still needs to be further reduced. We have installed a resistive sound-absorbing cotton structure outside the expansion chamber, which is designed based on the spectral characteristics of the residual noise emitted by the pressure reducing body to effectively absorb the residual noise. After the user installs it as required, the noise reduction can reach 30-50 decibels. Make it meet the requirements of the Industrial Enterprise Noise Standard.

three、Characteristics of boiler muffler:

1: Boiler silencer

For safety valves of thermal devices such as boilers, the exhaust of steam should not only avoid excessive noise, but also allow the steam flow to be smoothly discharged. Therefore, the commonly used multi-stage throttling and small hole injection noise reduction methods in the past should not be adopted. This limitation has always been a difficult point in the design of safety valve mufflers, and it is also the reason for the poor noise reduction effect of safety valve mufflers. The silencer used for the safety door of this boiler also adopts the principle of noise reduction through resistance, spray, and resistance. The large-diameter expansion hole is used instead of the smaller diameter control hole, which further strengthens the noise reduction mechanism through resistance, spray, and resistance in structure, achieving the sound reduction effect.

2: Boiler ignition exhaust muffler

To suppress the noise emitted by high-pressure steam flow, there are currently various forms of mufflers, most of which use multi-stage throttling to reduce pressure. Due to their complex structure, large weight, and difficulty in disassembly and maintenance, their application scope is limited. The muffler with this structure overcomes the above-mentioned drawbacks.

This type of exhaust muffler system is designed based on a reasonable noise reduction principle. High pressure steam enters the pressure reducing body through a large volume expansion after passing through a flow control system in the exhaust muffler, forming low-pressure steam that is then sprayed out. During this process, some of the internal energy in the steam flow is converted into sound energy of a certain frequency. Although the noise power is greatly reduced, it often remains higher than the standard value due to factors such as exhaust deviation from the design value. For this purpose, a double-layer structure soundproof cover was designed outside the pressure reducing body, which was designed based on the spectral characteristics of the residual noise emitted by the pressure reducing body to effectively absorb the residual noise. After the user installs as required, the total noise reduction should reach 36-50 decibels.

3: Low pressure steam muffler

Various industrial and mining enterprises use a large number of low-pressure boilers with a pressure of 1.6 MPa or less, and there are also a large number of low-pressure thermal devices in the power plant thermal system, such as back pressure steam turbines, deaerators, auxiliary gas compressors, steam turbine oil pumps, boiler continuous discharge, and periodic discharge expanders. The exhaust pipe of the above equipment requires a lightweight structure and a more convenient installation of a silencer. Our factory has designed deaerator series, back pressure steam turbine series and other series of products for different noise reduction objects, which can meet the requirements of users.   

The noise reduction effect of the exhaust muffler mentioned above can meet the requirementsGB12348－2008Requirements of the "Emission Standards for Industrial Enterprise Boundary Environmental Noise"It has been widely applied in China.

4、 Boiler silencer product series and external dimensions：

1: Boiler silencer (for superheated steam)

2：Boiler ignition exhaust muffler (for superheated steam)

3: Boiler drum safety valve exhaust muffler (for saturated steam)

5、 Guidelines for Ordering and Selecting Boiler Mufflers:

This exhaust muffler series is carefully designed according to the user's steam emission target and emission requirements. Therefore, only products that meet the emission target, steam parameters, and emission volume can achieve ideal noise reduction effect. Therefore, the following parameters must be provided when ordering a muffler:
① For thermal power plants, the turbine model, boiler capacity, steam pressure, and temperature should be provided;
② Object of use (such as for boiler overheating discharge or steam drum safety valve discharge, etc.);
③ Emissions T/H;
④ The original outer diameter and wall thickness of the exhaust pipe;
⑤ If it is necessary to entrust our factory to carry out installation design, the original exhaust pipeline installation diagram should be provided.
For models not listed in this product manual, users can provide the relevant information mentioned above, and our factory will select them on their behalf.
6、 Installation instructions for boiler muffler:
① The exhaust muffler should be installed perpendicular to the roof of the factory, and the muffler bracket should be fixed to the factory building with a steel support.
② To increase the wind resistance of the factory roof at high altitude, the exhaust muffler body adopts a support type support. Therefore, the exhaust pipe in front of the exhaust muffler should have an expansion bend to absorb thermal expansion. If the original exhaust pipe section is already equipped with a drain pan in the vertical direction, the expansion bend should not be installed.
③ The bottom of the exhaust muffler body is designed with drainage pipes or holes, and the holes should be checked for smoothness.
④ The hole where the exhaust pipe passes through the factory roof platform should have a thin steel plate made rainproof cover.
⑤ For safety doors, in principle, one safety door is equipped with one muffler. There are two types of safety doors: single seat and double seat. For double seat safety doors, the exhaust pipe can be merged into one main pipe and connected to the muffler during installation. However, for double seat safety doors with large exhaust volume, two mufflers can also be installed.
⑥ For exhaust silencers with small displacement used in deaerators, jet type air extractors, etc., the external design is tubular, making installation more convenient. Installation method: The exhaust muffler is installed vertically along the walls and columns of the main factory building. Install steel sliding brackets on walls and columns, and install silencers and pipelines on them. The discharge outlet of the silencer should face the direction of the roof. It should be noted that this type of muffler comes with fixed supports when it leaves the factory. When using a sliding bracket installation, the fixed supports can be omitted.

 The standard specifies the emission limits and measurement methods for environmental noise at the boundary of industrial enterprises and fixed equipment factories(See Table 1)      Unit db (A)

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Safety Production Standardization Certificate Number:AQBJXXW202100026

quality management system (GB/T19001-2016 idt ISO9001:2015)Certification certificate:25021Q10338R0S

High tech Enterprise Certificate Number:GR202332017985

Da Shi "noise reduction equipment, payment will be made after installation is qualified!

Welcome to inquire by phone

mobile phone17511412888(Manager Li)

mobile phone17312347708

Email：dashijixie@126.com

Address: Keyuan Village, Dunshang Town, Ganyu District, Lianyungang City (within the factory area of the muffler manufacturer)