Environmental protection technology scheme for generating set

Source:Environmental Data:2017-07-28 Hits:

1, operation process of generator will produce noise pollution, mainly concentrated in the high frequency noise up to 110 decibels, after treatment reached the requirements of the national standard 11 class, 60 dB to 50 dB at night, daytime.

2, the exhaust gas from the engine exhaust gas is mainly carbon monoxide (CO), hydrocarbons (HC), nitrogen oxides (NOX) and particulate matter (PM) particulate matter is the main component of carbon smoke. Two, governance objectives

1, the regional (noise) to ensure the good work environment and quiet surroundings, to ensure that the economic, social and environmental benefits and the three unified governance necessary to achieve the "industrial enterprises noise standard" (CB12348-90) of 11 kinds of value.

2, carbon (soot) with a large number of chemical substances, including carcinogens, inhaled will remain in the lungs, flue gas purifier adopts advanced unique capture technology, the activation point of palladium and platinum and rhodium adsorbed by precious metals, capture harmful gas molecules, harmful chemical bonds between gas molecules interrupt (or weaken) using molecular separation into atoms, then the residual oxygen in the exhaust gas (5%-9%) reaction with carbon, hydrogen, carbon dioxide and water (chemical reaction) make full use of the catalyst for oxidation reaction on the heat carrier temperature, carbon particle second times in the second combustion, combustion the black smoke (i.e. particles) have been fully degradation. Three, design basis

The 1 assessment report, and the requirement of environmental impact requirements. 2, "industrial enterprise noise standard" (GB12348-90) 3, the generator room architectural design, the surrounding environment and acoustic principle four, design principles

1, the design process is scientific, reasonable 2, investment as much as possible to save

3, as far as possible the province to change the structure of the engine room 4, does not affect the normal operation of generating units 5, operation and management of five, generating units noise control

1, sound source analysis

The noise of diesel engine is constituted by a variety of sound sources of complex sound sources, according to the noise radiation, noise of the diesel engine can be divided into the aerodynamic noise and the surface radiation noise generation mechanism, in accordance with the diesel engine surface noise can be divided into the combustion noise and mechanical noise, the aerodynamic noise is the main noise in the original, the aerodynamic noise is due to aerodynamic noise radiation directly to the atmosphere disturbed by the unstable process gas and the interaction between gas and objects, including the air inlet noise, exhaust noise, cooling fan noise.

2, intake noise

Intake noise is one of the main aerodynamic noise of diesel engine, which is composed of periodic inlet valve is opened and closed due to pressure changes and the formation of advantages when the inlet valve opens, a pressure pulse is generated in the air inlet pipe, and as the piston continues to move, it is pressure, when the intake valve when closed, also have a certain duration of the pressure pulse, causing the intake noise periodically, the noise frequency components mainly concentrated in the low frequency range. At the same time, when the high speed airflow to flow through the flow area of the inlet valve when the turbulence body leads to high frequency noise generated, mainly concentrated in the high frequency range, consistent with the main frequency of the intake pipe air column inherent frequency and periodicity of the intake noise, the resonance noise of the gas column in the air inlet noise will be more prominent, the intake air inlet mode the noise and the engine, the intake valve structure, cylinder diameter, cam and other design factors, affected by rotational speed, speed doubled the air inlet noise can increase.

3, exhaust noise

The exhaust noise is the main source of engine noise, the noise is generally higher than the 10-15dB engine noise (A) engine exhaust high temperature (about 490 DEG C) and pressure (3-4 ATM) gas, exhaust process is generally divided into two stages, namely the free exhaust section and forced exhaust section of the engine exhaust gas from the exhaust high speed door out along the exhaust pipe into the muffler, finally from the tail pipe into the atmosphere to produce wide band exhaust noise in this process.

The exhaust noise contains complex noise components, per unit time as the number of exhaust exhaust noise frequency, pipeline resonance noise of the gas column, air blowing noise at the exhaust manifold, exhaust gas injection and the impact of noise, resonance noise of the cylinder, the vortex noise and exhaust system internal turbulence noise.

4, cooling fan noise

The noise of the fan by the rotation noise and the turbulent noise, rotation noise is due to air fan blade cutting cycle, caused by pressure pulsation of the air fan movement caused by air turbulence around the body, the air disturbance, forming gas compression and thinning process and the formation of a wide band noise. At high speed, the main noise source is often the main source of noise.

5, surface radiation noise

The combustion noise and mechanical noise is very difficult to distinguish, usually the noise pressure vibration through the cylinder head, piston, connecting rod, crankshaft body radiating cylinder formed called combustion noise. The impact of piston on the cylinder liner, timing gear, air distribution mechanism, fuel injection system and other moving parts between the mechanical impact vibration caused by noise is called mechanical noise. Six, governance methods

1, to prevent noise from leaking into the exhaust duct, the air duct installation facilities must have general absorption noise reduction (sound absorption, sound insulation, vibration damping, vibration resistance etc.) by absorption method of this scheme in the exhaust duct installed inside the chip through the absorber absorber, special viscous performance and internal friction of particle acoustic wave propagation plays a key role. The sound energy transformation