TWI779813B - Combustion method for reducing exhaust gas contents - Google Patents

Abstract

A combustion method for reducing exhaust gas contents, comprising the following steps: providing a liquid fuel in a boiler and burning the liquid fuel under a normal pressure until a vapor pressure of the boiler reaches 3 Kg/cm ²; then adding a combustion improvement in the boiler and continuously burning the boiler and maintaining a vapor pressure of the boiler at 3-5 Kg/cm ²; and making the boiler heat a medium when the vapor pressure of the boiler is between 3-5 Kg/cm ², and measuring exhaust gas contents of the boiler.

Description

Combustion methods to reduce exhaust emissions

The invention relates to the field of fuel, and in particular to a combustion method suitable for boilers to reduce exhaust emissions.

Boilers are important heat supply equipment in the national economy. Boilers are used in electric power, machinery, metallurgy, chemical industry, textile, papermaking, food and other industries, as well as industrial and civil heating.

The boiler mainly converts the chemical energy in the fuel into thermal energy stably and continuously through the process of burning fuel, and uses this thermal energy to heat water or heat medium as a heat source for drying or heating, or a power source.

However, although the use of boilers brings convenience to factory operations, it is also accompanied by environmental problems. For example, in the case of incomplete combustion of fuel, exhaust gases such as sulfur oxides (SOx), nitrogen oxides (NOx), carbon monoxide (CO) and carbon dioxide (CO ₂ ) emitted by boilers increase the greenhouse effect and lead to global warming , causing severe environmental pollution, and the ultrafine suspended particles (PM2.5) produced after combustion degrades air quality and endangers human health.

Therefore, it is imperative to develop combustion methods that comply with environmental regulations and have lower exhaust emissions.

In view of this, the present invention provides a combustion method suitable for boilers to reduce waste gas emissions. By adjusting the combustion method, a combustion method that complies with environmental protection regulations, lower waste gas emissions and public safety is provided.

According to one embodiment, the combustion method for reducing exhaust emissions of the present invention includes the following steps: providing a liquid fuel in a boiler, and burning the liquid fuel under normal pressure until the steam pressure of the boiler reaches 3 Kg/cm ² ; then Add a combustion improver to the boiler, continue to burn in the boiler, and maintain the steam pressure of the boiler at 3-5 Kg/cm ² ; and the steam pressure of the boiler is between 3-5 Kg/cm ² Let the boiler heat a medium, and measure the boiler exhaust gas.

In one embodiment, the liquid fuel is low sulfur fuel oil.

In one embodiment, the combustion modifier is water vapor.

In one embodiment, the low-sulfur fuel oil is a fuel oil comprising vegetable oil such as palm oil.

In one embodiment, the liquid fuel is provided at a rate of 100-120 liters/hour, and the combustion improver is provided at a rate of 30-40 kg/hour.

Please refer to Table 1, which shows the boiler air pollutant emission standards that should be complied with by new boilers and existing boilers since July 1, 2009, announced by the Environmental Protection Agency of the Executive Yuan.

Table 1: Boiler Air Pollutant Emission Standards air pollutants Discharge Pipeline Standards particulate pollutants 30 mg/Nm ³ SOx fifty ppm Nitrogen oxides one hundred ppm

Please refer to FIG. 1 , which shows a combustion method for reducing exhaust emissions according to an embodiment of the present invention. As shown in Figure 1, the combustion method for reducing waste gas emission of the present invention is suitable for combustion use in the boiler, comprises the following steps:

Step S10: providing a liquid fuel in a boiler, burning the liquid fuel under normal pressure until the steam pressure of the boiler reaches 3 Kg/cm ² ;

Step S20: Then add a combustion improver to the boiler, continue to burn in the boiler, and maintain the steam pressure of the boiler at 3-5 Kg/cm ² ; and

Step S30: Heat a medium in the boiler when the steam pressure of the boiler is 3-5 Kg/cm ² , and measure the exhaust gas of the boiler.

In one embodiment, the liquid fuel of the present invention is low-sulfur fuel oil, the combustion improver is water vapor, and the medium is water. Preferably, the low-sulfur fuel oil is fuel oil containing vegetable oil such as palm oil.

In one embodiment, in step S10, the liquid fuel is provided at a rate of 100-120 liters/hour, and in step S20, the combustion improver is provided at a rate of 30-40 kg/hour supply.

In one embodiment, the liquid fuel is used for combustion to heat the medium, and the combustion improver is used to reduce the flame temperature in the boiler, thereby reducing sulfur oxides (SOx) and nitrogen oxides in the combustion process (NOx) formation.

Below, several examples will be used to illustrate the specific implementation of the combustion method of the present invention. Those skilled in the art can easily understand the advantages and effects that the present invention can achieve through the contents of this specification, and without departing from this specification Various modifications and changes are made under the spirit of the invention to implement or apply the content of the invention.

Please refer to Table 2, Table 3 and Table 4, respectively showing in the following embodiments 1-2, adopting the combustion method of the present invention to use 6 tons of horizontal smoke tube boiler combustion embodiment 1- comprising low-pressure oil pump and burner 2. When fuel oil is used, a portable detection instrument is used to measure the pollutant data in the flue gas that has not been treated by exhaust gas treatment equipment (such as a scrubber).

Device model used: 1. 6-ton horizontal smoke tube boiler: Manufactured by Longquan Boiler; 2. Oil pump: Manufactured by Heyongxing Machinery Factory; 3. Portable detection instrument: Manufactured by KIMO, France (model KGAZ310).

Components of the fuel composition used: 1. Special low-sulfur fuel oil: purchased from Taiwan Petroleum Corporation; and 2. Industrial low-sulfur fuel oil: purchased from Universal International Energy Co., Ltd. (oil number UNI-65527864).

Example 1:

In this embodiment, the above-mentioned 6-ton horizontal smoke tube boiler is used to implement the combustion method shown in Figure 1, and the above-mentioned special low-sulfur fuel oil is provided as the liquid fuel, and the liquid fuel is provided at a rate of 110 liters/hour. The improver is provided at a rate of 30 kg/hour, and the air pollutant data in the following Table 2 are measured by the aforementioned portable detection equipment.

Table II: Air Pollutant Project data SOx 19 ppm Nitrogen oxides 45 ppm

Example 2:

In this embodiment, the aforementioned 6-ton horizontal smoke tube boiler is used to implement the combustion method shown in Figure 1, and the aforementioned industrial low-sulfur fuel oil is provided as the liquid fuel, and the liquid fuel is provided at a rate of 110 liters/hour. The combustion improver was provided at a rate of 30 kg/hour, and the air pollutant data in Table 2 below was measured by the aforementioned portable detection instrument.

Table three: Air Pollutant Project data SOx 0 ppm Nitrogen oxides 30 ppm

Based on the exhaust emission data in the above Tables 2 to 3, it can be seen that the combustion method of the present invention provides a combustion method suitable for reducing exhaust emissions, which can reduce sulfur oxides (SOx) and nitrogen oxides (NOx) after combustion. The generation of air pollutants, such as sulfur oxides (SOx) and nitrogen oxides (NOx) in the exhaust gas emissions, makes the data in line with the latest boiler air pollutant emission standards announced by the Environmental Protection Agency of the Executive Yuan. In this way, the problems of excessive air pollutants and super-emission of ultra-fine suspended particles encountered in the operation method of traditional boilers can be solved, and the emission of black smoke after combustion can be reduced.

In addition, in view of the fact that the combustion method provided by the present invention is suitable for use in existing boilers, there is no need to build additional new equipment, and it is not necessary to modify existing boilers, thus avoiding changing the boiler system to use flammable and explosive fuels such as natural gas. The construction of new pipelines or storage tanks may encounter additional industrial safety problems such as careless use and natural gas leakage when using new fuels with low flash points, thus providing a safe and A convenient and economical combustion method for reducing exhaust emissions.

In summary, although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Those with ordinary knowledge in the technical field of the present invention can, without departing from the spirit and scope of the present invention, Various changes and modifications are made, so the scope of protection of the present invention should be defined by the scope of the appended patent application.

S10: step S20: step S30: step

Fig. 1 is a combustion method for reducing exhaust emissions according to an embodiment of the present invention.

S10: step

S20: step

S30: step

Claims (5)

A combustion method for reducing waste gas emissions, comprising the following steps: providing a liquid fuel in a boiler, burning the liquid fuel at normal pressure until the vapor pressure of the boiler reaches 3 Kg/cm ² ; then adding a combustion gas in the boiler Improver, continue to burn in the boiler, and maintain the steam pressure of the boiler at 3-5 Kg/cm ² ; and make the boiler heat a medium when the steam pressure of the boiler is 3-5 Kg/cm ² , and measure the exhaust gas of the boiler. The combustion method for reducing exhaust emissions as claimed in claim 1, wherein the liquid fuel is low-sulfur fuel oil. The combustion method for reducing exhaust emissions according to claim 2, wherein the low-sulfur fuel oil is fuel oil containing palm oil. The combustion method for reducing exhaust emissions as claimed in claim 1, wherein the combustion improver is water vapor. The combustion method for reducing exhaust emissions as claimed in claim 1, wherein the liquid fuel is provided at a rate of 100-120 liters/hour, and the combustion improver is provided at a rate of 30-40 kg/hour .

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