Energy-saving environment-friendly liquid slag removal type coal-fired heating system

Abstract

The invention discloses an energy-saving environment-friendly liquid slag removal type coal-fired heating system, which comprises a pulverized coal feeding device, an air distribution device, an ignition device, a liquid and slag collection device, a burning-out chamber, a high-temperature air preheater, a plurality of air and smoke pipes and a vertical liquid slag removal type pulverized coal combustor, wherein the vertical liquid slag removal type pulverized coal combustor is communicated with the burning-out chamber. The pulverized coal inlet, the oil inlet and the air inlet of the combustor are respectively connected with the pulverized coal feeding device, the ignition device and the air distribution device through pipes. A secondary prewhirling chamber, a combustion chamber and a slag removal chamber are sequentially and vertically communicated in the combustor. The slag removal chamber is connected with a liquid collection device. The side wall of the lower part of the combustion chamber is horizontally and axially communicated with a combustor flame outlet which is arranged in a direction consistent with secondary air whirling direction and is tangent with the inner wall surface of the combustor. The outlet of the combustor flame outlet is connected with a high-temperature smoke inlet. A high-temperature smoke outlet is arranged at the top end of the burning-out chamber and the bottom end of the burning-out chamber is connected with a solid slag collection section. The high-temperature air preheater is arranged on the high-temperature smoke outlet. Moreover, the system additionally comprises a heat supply pipe communicated with the high-temperature air preheater. The entire coal-fired heating system is connected with a heating device through the heat supply pipe arranged above the high-temperature air preheater.

Description

technical field [0001] The invention relates to a pulverized coal combustion system for industrial kilns, in particular to an energy-saving and environment-friendly liquid slag discharge type coal-fired heating system for heating and drying purposes. Background technique [0002] In the field of industrial hot air heating and drying, various heating methods such as coal, oil, natural gas, coal water slurry, and coal gasification have appeared. , 201331176Y, etc. describe the specific implementation structure, and many of them have achieved industrial applications. But there are also many outstanding problems in actual operation. [0003] Among them, the way of burning diesel oil, heavy oil or natural gas has a good degree of automation, but the fuel cost is high, which is generally unaffordable for small and medium-sized enterprises; [0004] The traditional lump coal (or crushed coal) layer combustion method is seriously polluting. The fly ash and unburned coke in the flu...

AI Technical Summary

Problems solved by technology

However, there are many outstanding problems in actual operation

[0003] Among them, the way of burning diesel oil, heavy oil or natural gas has a good degree of automation, but the fuel cost is very high, which is generally unaffordable for small and medium-sized enterprises;

[0004] The traditional lump coal (or crushed coal) layer combustion method is seriously polluting. The fly ash and unburned coke in the flue gas affect the quality of the heated product. In order to improve the cleanliness of the flue gas, a huge ash settlement has to be installed chamber or a special ash removal device, which greatly increases the investment cost and reduces the thermal efficiency of the system;

[0005] The preparation, transportation and storage process of coal-water slurry is relatively complicated. At the same time, because the coal-water slurry contains a large amount of water, its evaporation and gasification consume a lot of energy. The ignition time and distance are long, and it is easy to directly flush the furnace to cause coking. In addition, the coal-water slurry The furnace temperature of the hot blast stove is low, which easily leads to a low combustion rate of pulverized coal particles, and the proportion of fly ash and unburned coke in the flue gas is still relatively large. Therefore, in the actual operation process, the ash content and calorific value of coal The requirements for physical and chemical properties such as moisture and moisture are very stringent;

[0006] The coal gasification combustion method has high investment and hidden safety hazards. At the same time, the energy efficiency of the indirect use of coal is low. This method of reducing energy utilization rate and achieving clean combustion is inappropriate and cannot truly achieve "energy saving" and "energy saving". Emission reduction" win-win

[0007] Therefore, the application of the above-mentioned hot air supply technology or equipment is far from meeting the national or regional requirements for energy saving, emission reduction, and oil (gas) consumption reduction, and great improvements are still needed.

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