WO2019129199A1

WO2019129199A1 - Composite gasification and combustion system for pulverized biomass

Info

Publication number: WO2019129199A1
Application number: PCT/CN2018/124867
Authority: WO
Inventors: 张博; 刘效洲
Original assignee: 广州环峰能源科技股份有限公司
Priority date: 2017-12-29
Filing date: 2018-12-28
Publication date: 2019-07-04
Also published as: CN108300515A; AU2018396957B2; AU2018396957A1

Abstract

Disclosed is a composite gasification and combustion system for pulverized biomass, the system comprising an upright mixing tower (1) and a horizontal combustion furnace (2), wherein the centre of the top of the mixing tower (1) is provided with a pulverized biomass inlet (11), the bottom of the mixing tower (1) is connected at the middle of an upper end of the combustion furnace (2), and the bottom of the combustion furnace (2) is provided with a reciprocating grate (22); a flow equalising chamber (3) is further provided in the mixing tower (1), the pulverized biomass inlet (11) is in communication with the flow equalising chamber (3), side walls of the flow equalising chamber (3) are all provided with several through holes (31), all the through holes (31) are in communication with an inner chamber of the mixing tower (1); and a side wall of the mixing tower (1) is successively further provided with a first air inlet duct (12), a petroleum coke powder inlet duct (13) and a second air inlet duct (14) at intervals from top to bottom, the first air inlet duct (12) being in communication with the flow equalising chamber (3), and the petroleum coke powder inlet duct (13) and the second air inlet duct (14) being in communication with the inner chamber of the mixing tower (1). The system has a simple structure, and the pulverized biomass combustion and gasification efficiency is greatly increased.

Description

Biomass powder composite gasification combustion system

Technical field

The invention relates to a biomass burning technology, in particular to a biomass powder composite gasification combustion system.

Background technique

As one of the most influential technologies in the world economic development in the 21st century, new energy technologies will eventually rely on the development of new energy industries to solve global energy crisis and environmental pollution problems and achieve sustainable development. Among the renewable energy sources encouraged by the state, the largest one is the generation and utilization of biomass energy. China has abundant biomass energy resources. According to estimates, China's theoretical biomass energy resources are about 5 billion tons. At present, the biomass energy resources available for development are mainly biomass waste, including crop straw, chaff, fuelwood, industrial organic waste and municipal solid organic waste. In the face of the high consumption, high pollution and resource and environmental constraints in economic development, in recent years, China has begun to seek a comprehensive transformation of the economic growth model and take a conservation-oriented development path. The circular economy is based on the efficient use and recycling of resources, with the principle of “reduction, reuse and resource utilization”, with low consumption, low emission and high efficiency as the basic characteristics, in line with the concept of sustainable development. The economic growth model is a fundamental change in the traditional growth model of “mass production, mass consumption, and mass abandonment”. Biomass energy is an important energy source. It is estimated that in the next century, 40% of the world's energy consumption comes from biomass energy. China has abundant biomass energy resources. 70% of China's rural energy is biomass, and only rural straw is always used every year. The amount reached more than 600 million tons. With the development of the economy, the improvement of people's living standards, the strengthening of environmental protection awareness, and the rational and efficient development and utilization of biomass energy, it is increasingly attracting people's attention.

At present, the combustion efficiency of biomass powder is relatively low. If the efficiency is not further improved, it will be difficult to commercialize and industrialize.

Summary of the invention

In order to overcome the disadvantages mentioned in the prior art, the present invention provides a biomass powder composite gasification combustion system.

The technical solution adopted by the present invention to solve the technical problem is: a biomass powder composite gasification combustion system, comprising a vertically arranged mixing tower and a horizontally arranged combustion furnace, wherein the mixing tower has a biomass powder inlet at the top center a bottom of the mixing tower is connected to a middle portion of an upper end of the combustion furnace, a bottom of the combustion furnace is provided with a reciprocating grate, a front side of the burning furnace is provided with a hot air outlet; and the mixing tower is further provided with a hot air outlet a flow chamber, the biomass powder inlet is connected to the current sharing chamber, and a sidewall of the current sharing chamber is provided with a plurality of through holes, all of the through holes communicating with the inner cavity of the mixing tower, the mixing tower The side wall is further provided with a primary air inlet pipe, a petroleum coke powder inlet pipe and a secondary air inlet pipe from top to bottom, wherein the primary air inlet pipe communicates with the current sharing cavity, the petroleum coke powder inlet pipe and A secondary air inlet conduit communicates with the interior of the mixing tower.

The injection direction of the primary air inlet pipe is perpendicular to the injection direction of the biomass powder inlet, and the injection direction of the petroleum coke powder inlet pipe is tangent to the outer sidewall of the current sharing cavity, and the secondary air inlet The injection direction of the tube is opposite or perpendicular to the injection direction of the primary air inlet tube.

The primary air inlet pipe, the petroleum coke powder inlet pipe, and the secondary air inlet pipe are each provided with a check valve that allows only injection into the interior of the mixing tower.

The bottom of the mixing tower is funnel shaped.

A homogenizing plate is further disposed in the mixing tower, and the uniformizing plate is disposed in a lower portion of the mixing tower, and the uniformizing plate is uniformly provided with a plurality of uniform air holes.

The through hole has a diameter of 50 to 60 mm, and the uniform hole has a diameter of 80 to 100 mm.

The beneficial effects of the invention are: the biomass powder composite gasification combustion system of the design has a simple structure, by injecting biomass powder on the top of the mixing tower, the primary air inlet pipe on the side, the petroleum coke powder inlet pipe and the secondary air inlet. The tube injects the primary wind, the petroleum coke powder and the secondary air in turn, and the biomass powder forms a cyclone in the uniform flow chamber under the blowing of the primary air, and then uniformly sprays into the mixing tower through the through holes of the side wall of the equalization chamber. Inside, the cyclone mixing with the petroleum coke powder and the secondary air is formed, so that the combustion efficiency of the biomass powder entering the combustion furnace is greatly improved.

DRAWINGS

Figure 1 is a front elevational view of the overall structure of the present invention;

Figure 2 is a plan view showing the structure of the mixing tower of the present invention.

Detailed ways

The invention will now be further described with reference to the accompanying drawings.

As shown in FIG. 1 and FIG. 2, the biomass powder composite gasification combustion system comprises a vertically arranged mixing tower 1 and a horizontally arranged combustion furnace 2, and a biomass powder inlet is arranged at the top center of the mixing tower 1. 11. The bottom of the mixing tower 1 is connected to the middle of the upper end of the combustion furnace 2, the front side of the combustion furnace 2 is provided with a hot air outlet 21, and the bottom of the combustion furnace 2 is provided with a reciprocating grate 22, a reciprocating furnace The end of the row 22 is provided with a spiral slagging device 23; the mixing tower 1 is further provided with a current sharing chamber 3, the biomass powder inlet 11 is connected to the current sharing chamber 3, and the side wall of the current sharing chamber 3 Each of the through holes 31 is connected to the inner cavity of the mixing tower 1, and the side wall of the mixing tower 1 is sequentially spaced from top to bottom with a primary air inlet pipe 12 and petroleum coke. a powder inlet pipe 13 and a secondary air inlet pipe 14, the primary air inlet pipe 12 communicating with the equalizing chamber 3, the petroleum coke powder inlet pipe 13 and the secondary air inlet pipe 14 communicating with the inside of the mixing tower 1 Cavity.

The injection direction of the primary air inlet pipe 12 is perpendicular to the injection direction of the biomass powder inlet 11, the injection direction of the petroleum coke powder inlet pipe 13 is tangent to the outer side wall of the current sharing cavity 3, and the oil The number of the coke powder inlet tubes 13 may be set to be plural, distributed around the center of the center of the mixing tower 1; the injection direction of the secondary air inlet tubes 14 and the injection direction of the primary air inlet tubes 11 are Relative or vertical setting.

The primary air inlet pipe 12, the petroleum coke powder inlet pipe 13, and the secondary air inlet pipe 14 are each provided with a check valve 15 that allows only injection into the interior of the mixing tower 1.

The bottom of the mixing tower 1 has a funnel shape.

The mixing tower 1 is further provided with a uniform wind plate 4, which is placed in a lower portion of the mixing tower 1, and a plurality of uniform air holes 41 are evenly opened on the uniform air plate 4.

The through hole 31 has a diameter of 50 to 60 mm, and the uniform hole 41 has a hole diameter of 80 to 100 mm.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are still It is within the scope of the patent of the present invention.

Claims

A biomass powder composite gasification combustion system, comprising: a vertically arranged mixing tower and a horizontally arranged combustion furnace, the mixing tower having a biomass powder inlet at a top center thereof, and a bottom connection of the mixing tower a middle portion of the upper end of the combustion furnace, a bottom of the combustion furnace is provided with a reciprocating grate, a front side of the combustion furnace is provided with a hot air outlet; and a mixing chamber is further disposed in the mixing tower, the biomass powder The inlet communicates with the current sharing chamber, and the side walls of the current sharing chamber are provided with a plurality of through holes, all of the through holes communicate with the inner cavity of the mixing tower, and the side walls of the mixing tower are from top to bottom. a primary air inlet pipe, a petroleum coke powder inlet pipe and a secondary air inlet pipe are sequentially disposed, the primary air inlet pipe is connected to the current sharing cavity, and the petroleum coke powder inlet pipe and the secondary air inlet pipe are connected to the Mix the inner cavity of the tower.
The biomass powder composite gasification combustion system according to claim 1, wherein an injection direction of the primary air inlet pipe is perpendicular to an injection direction of the biomass powder inlet, and the petroleum coke powder inlet pipe is The injection direction is tangent to the outer sidewall of the current sharing chamber.
The biomass powder composite gasification combustion system according to claim 1 or 2, wherein an injection direction of the secondary air inlet pipe is opposite to or perpendicular to an injection direction of the primary air inlet pipe.
The biomass powder composite gasification combustion system according to claim 1, wherein the primary air inlet pipe, the petroleum coke powder inlet pipe and the secondary air inlet pipe are both provided only to the interior of the mixing tower. Injected check valve.
The biomass powder composite gasification combustion system according to claim 1, wherein the bottom of the mixing tower has a funnel shape.
The biomass powder composite gasification combustion system according to claim 1, wherein a mixing plate is further disposed in the mixing tower, and the uniformity plate is placed in a lower portion of the mixing tower, the uniform A plurality of uniform holes are uniformly formed on the wind plate.
The biomass powder composite gasification combustion system according to claim 1, wherein the through hole has a pore diameter of 50 to 60 mm.
The biomass powder composite gasification combustion system according to claim 6, wherein the uniform pores have a pore diameter of 80 to 100 mm.