Gas Analysis of Boiler Bottom Room above Water Seal

2015 ◽  
Vol 1092-1093 ◽  
pp. 516-519
Author(s):  
Xing Sen Yang ◽  
Jing Yin ◽  
Ke Liu ◽  
Jian Dong
Keyword(s):  
High Temperature ◽  
Thermal Power ◽  
Gas Analysis ◽  
Gas Composition ◽  
Coal Particles ◽  
Utility Boilers ◽  
Co Concentration ◽  
Combustible Gases ◽  
Water Seal ◽  
Furnace Pressure

The gas composition of boiler bottom room above the water-seal is very important to the steady operation of utility boilers in thermal power plant. As the water seal keeps air from entering the bottom room of the boiler, the gas there is comparatively enclosed. Coal particles fall down into the water from main burning area with high temperature. There is the possibility that carbon at high temperature react with water to produce combustible gases such as CO. When large quantities of slag fall down from the furnace into the water seal, the furnace pressure fluctuates widely and sharply, which leads to the flame out of the boiler quite often. The understanding of gas composition of the bottom room above water seal would help to find the reason of the pressure fluctuation. On the other hand, the gas composition above the water seal is the basic information that is deeded to research the whole burning process of coal particles and to maintain the steady operation state of boilers. Measurements were made to reveal the gas composition above the water seal. Temperature of gas just above the water seal was also measured. According to the measurement, CO concentration of high than 1000ppm was detected and the gas composition under normal state was analyzed.

scholarly journals OPTIMIZATION OF INORGANIC COMPONENTS OF FIRE PROTECTIVE VARNISH FOR WOOD

2021 ◽  
pp. 123-132
Author(s):  
Yu. Tsapko ◽  
◽  
А. Tsapko ◽  
O. Bondarenko ◽  
V. Lomaha ◽  
...  
Keyword(s):  
High Temperature ◽  
Fire Retardant ◽  
Protective Layer ◽  
Combustion Products ◽  
Wood Products ◽  
Maximum Temperature ◽  
Protective Film ◽  
Insulating Layer ◽  
Combustible Gases ◽  
Material Studies

Abstract. The processes of creation of fire-retardant varnish for wood consisting of a mixture of inorganic and polymeric substances are investigated in the work. It is established that the optimization of the inorganic component leads to a directional ratio of mineral acids and urea capable of effective fire protection of the material. Studies have shown that at the initial temperature of gaseous combustion products T = 68 °C, when exposed to the radiation panel, the untreated sample ignited after 146 s, the flame spread over the entire surface, instead, the sample fire-protected varnish did not ignite, the maximum temperature was 105 °C. In this case, as evidenced by the results of heat resistance, there is a change in the structure of the protective film of the coating. The thickness of the protective layer increases due to the decomposition of the composition, which leads to inhibition of oxidation in the gas and condensed phase, change the direction of decomposition towards the formation of non-combustible gases and combustible coke residue, reduce material combustion and increase flammability index. The coating under the influence of high temperature promotes the formation of a heat-insulating layer of coke, which prevents burning and the passage of high temperature to the material, which is confirmed by the absence of the process of ignition of fire-retardant wood. Features of braking of process of ignition and distribution of a flame of the wood processed by a varnish which consist in several aspects are established. This is the formation of a heat-insulating layer of coke, which prevents burning and the passage of high temperatures to the material, which is confirmed by the absence of the process of ignition of fire-retardant reeds. This indicates the possibility of targeted control of high temperature transfer processes to organic material through the use of special coatings for wood products.

Effect of gas composition and pressure on high temperature corrosion of various steels in coal gasification atmospheres

1994 ◽  
pp. 165-168
Author(s):  
Shigemitsu Kihara ◽  
Hirokatsu Nakagawa ◽  
Kiyokazu Nakagawa ◽  
Kazuo Saito ◽  
Susumu Hayashi
Keyword(s):  
High Temperature ◽  
Coal Gasification ◽  
High Temperature Corrosion ◽  
Gas Composition

scholarly journals First In-Situ Measurements of Plume Chemistry at Mount Garet Volcano, Island of Gaua (Vanuatu)

2020 ◽  
Vol 10 (20) ◽  
pp. 7293
Author(s):  
Joao Lages ◽  
Yves Moussallam ◽  
Philipson Bani ◽  
Nial Peters ◽  
Alessandro Aiuppa ◽  
...  
Keyword(s):  
High Temperature ◽  
Emission Rates ◽  
Gas Composition ◽  
Gas Analyzer ◽  
Total Volatile ◽  
Volcanic Gas ◽  
So2 Flux ◽  
Gas Chemistry

Recent volcanic gas compilations have urged the need to expand in-situ plume measurements to poorly studied, remote volcanic regions. Despite being recognized as one of the main volcanic epicenters on the planet, the Vanuatu arc remains poorly characterized for its subaerial emissions and their chemical imprints. Here, we report on the first plume chemistry data for Mount Garet, on the island of Gaua, one of the few persistent volatile emitters along the Vanuatu arc. Data were collected with a multi-component gas analyzer system (multi-GAS) during a field campaign in December 2018. The average volcanic gas chemistry is characterized by mean molar CO2/SO2, H2O/SO2, H2S/SO2 and H2/SO2 ratios of 0.87, 47.2, 0.13 and 0.01, respectively. Molar proportions in the gas plume are estimated at 95.9 ± 11.6, 1.8 ± 0.5, 2.0 ± 0.01, 0.26 ± 0.02 and 0.06 ± 0.01, for H2O, CO2, SO2, H2S and H2. Using the satellite-based 10-year (2005–2015) averaged SO2 flux of ~434 t d−1 for Mt. Garet, we estimate a total volatile output of about 6482 t d−1 (CO2 ~259 t d−1; H2O ~5758 t d−1; H2S ~30 t d−1; H2 ~0.5 t d−1). This may be representative of a quiescent, yet persistent degassing period at Mt. Garet; whilst, as indicated by SO2 flux reports for the 2009–2010 unrest, emissions can be much higher during eruptive episodes. Our estimated emission rates and gas composition for Mount Garet provide insightful information on volcanic gas signatures in the northernmost part of the Vanuatu Arc Segment. The apparent CO2-poor signature of high-temperature plume degassing at Mount Garet raises questions on the nature of sediments being subducted in this region of the arc and the possible role of the slab as the source of subaerial CO2. In order to better address the dynamics of along-arc volatile recycling, more volcanic gas surveys are needed focusing on northern Vanuatu volcanoes.

Study on Off-Design Steady State Performances of Helium Gas Turbocompressor for HTGR-GT

2006 ◽  
Author(s):  
Qisen Ren ◽  
Xiaoyong Yang ◽  
Zhiyong Huang ◽  
Jie Wang
Keyword(s):  
Steady State ◽  
High Temperature ◽  
Electric Power ◽  
Gas Turbine ◽  
Thermal Power ◽  
Power Adjustment ◽  
Partial Load ◽  
Helium Gas ◽  
Gas Turbine Cycle ◽  
High Temperature Gas

The high temperature gas-cooled reactor (HTGR) coupled with direct gas turbine cycle is a promising concept in the future of nuclear power development. Both helium gas turbine and compressor are key components in the cycle. Under normal conditions, the mode of power adjustment is to control total helium mass in the primary loop using gas storage vessels. Meanwhile, thermal power of reactor core is regulated. This article analyzes off-design performances of helium gas turbine and compressors for high temperature gas-cooled reactor with gas turbine cycle (HTGR-GT) at steady state level of electric power adjustment. Moreover, performances of the cycle were simply discussed. Results show that the expansion ratio of turbine decreases as electric power reduces but the compression ratios of compressors increase, efficiencies of both turbine and compressors decrease to some extent. Thermal power does not vary consistently with electric power, the difference between these two powers increases as electric power reduces. As a result of much thermal energy dissipated in the temperature modulator set at core inlet, thermal efficiency of the cycle has a widely reduction under partial load conditions.

The Largest CFB Boiler (440t/h) in China and Power Station Design

2003 ◽  
Author(s):  
Yanqi Qiao
Keyword(s):  
High Temperature ◽  
Thermal Power ◽  
Cyclone Separator ◽  
Reliable Operation ◽  
Power Station ◽  
Advanced Technique ◽  
Cfb Boiler ◽  
Plant Construction ◽  
Economic Operation ◽  
Technological Improvements

Xinxiang Thermal Power Plant Construction Project adopts the first largest set of CFB boiler. The paper makes an introduction to its characteristics in practical use. The boiler has the proper construction, advanced technique, complete function and reliable operation after technological improvements in abrasion proof, desulfurizing, jellaba, high–temperature cyclone separator, ash cooler and combustor. The paper also discuss on the unfeasible side bunker program, optimum design on span of deaerator and coal bunker bay, no adoption of independent control building and whole platform on the operating floor of boiler, no enclosure below boiler operating floor in detail. It greatly decreased the project cost on the premise of safety and economic operation.

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