AU2018396957A1

AU2018396957A1 - Composite gasification and combustion system for pulverized biomass

Info

Publication number: AU2018396957A1
Application number: AU2018396957A
Authority: AU
Inventors: Xiaozhou LIU; Bo Zhang
Original assignee: GUANGZHOU HUANFENG ENERGY TECHNOLOGY CO Ltd
Current assignee: GUANGZHOU HUANFENG ENERGY TECHNOLOGY Co Ltd
Priority date: 2017-12-29
Filing date: 2018-12-28
Publication date: 2019-10-17
Anticipated expiration: 2038-12-28
Also published as: WO2019129199A1; AU2018396957B2; CN108300515B; CN108300515A

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

SPECIFICATION

Composite Gasification and Combustion System for Pulverized Biomass

FIELD OF THE INVENTION [0001] The present invention relates to a biomass combustion technology, in particular to a composite gasification and combustion system for pulverized biomass.

BACKGROUD OF THE INVENTION [0002] As one of the most influential technologies in the world economic development in the 21st century, it will eventually be relied upon by people to solve global energy crisis and environmental pollution problems and achieve sustainable development. Among the renewable energy sources encouraged by the state, the most important part 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 mainlybiomass waste, including crop straw, chaff, i

fuelwood, industrial organic waste and municipal solid organic waste. Faced with the problems of high consumption, high pollution and resource and environmental constraints accompanying economic development, in recent years, China has begun to seek a comprehensive transformation of the economic growth model and take a path of conservation-oriented development. The recycling economy is an economic growth model based on the efficient use and recycling of resources, with the principle of reduction, reuse and resource utilization, and with low consumption, low emission and high efficiency as the basic characteristics, in line with the concept of sustainable development. It is a fundamental change to the traditional growth model of mass production, mass consumption, and mass discarding. Biomass energy is an important energy source, and it is estimated that by the next century, 40% of world energy consumption will come from biomass energy. China has abundant biomass energy resources. 70% of China's rural energy is biomass. In rural areas alone, there are more than 600 million tons of straw per year. 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.

[0003] At present, the combustion efficiency of pulverized biomass is relatively low. If the efficiency is not further improved, it will be difficult to commercialize and industrialize.

SUMMARY OF THE INVENTION [0004] In order to overcome the disadvantages mentioned in the prior art, the present invention provides a composite gasification and combustion system for pulverized biomass.

[0005] The technical solution adopted by the present invention to solve the technical problem thereof is as follows. A composite gasification and combustion system for pulverized biomass includes a vertically arranged mixing tower and a horizontally arranged combustion furnace. A pulverized biomass inlet is disposed at a top center of the mixing tower, and 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, and a front side of the combustion furnace is provided with a hot air outlet. A uniform flow chamber is further disposed in the mixing tower, and the pulverized biomass inlet communicates with the uniform flow chamber. A plurality of through holes is defined in a sidewall of the uniform flow chamber, and all the through holes are communicated with an inner cavity of the mixing tower. A Sidewall of the mixing tower 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. The primary air inlet pipe is in communication with the uniform flow chamber, and the petroleum coke powder inlet pipe and the secondary air inlet pipe are connected to the inner cavity of the mixing tower respectively.

[0006] An injection direction of the primary air inlet pipe is perpendicular to an injection direction of the pulverized biomass inlet, and an injection direction of the petroleum coke powder inlet pipe is tangent to an outer sidewall of the uniform flow chamber. An injection direction of the secondary air inlet pipe is opposite to or perpendicular to the injection direction of the primary air inlet pipe.

[0007] 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 only allows injection into the interior of the mixing tower.

[0008] The bottom of the mixing tower is funnel shaped .

[0009] The mixing tower is further provided with a uniform air plate which is placed in a lower portion of the mixing tower, and the uniform air plate is provided with a plurality of evenly distributed uniform air holes.

[0010] Each through hole has a diameter of 50 to 60mm, and each uniform air hole has a diameter of 80 to 10 0 mm.

[0011] The beneficial effects of the present invention are as follows. The pulverized biomass composite gasification combustion system of the design has a simple structure. By injecting pulverized biomass at the top of the mixing tower, the primary air inlet pipe, and by injecting primary air, petroleum coke and secondary air in a tangential direction by the primary air inlet pipe, the petroleum coke powder inlet pipe and the secondary air inlet pipe located on the sidewall respectively, the pulverized biomass forms a cyclone in the uniform flow chamber under the blowing of the primary air, and then are uniformly sprayed into the mixing tower through the through holes of the sidewall of the uniform flow chamber, and then forms a swirling when mixed with the petroleum coke powder and the secondary air. By this way, the gasification and combustion efficiency of pulverized biomass in the combustion furnace is greatly improved.

BRIEF DESCRIPTION OF THE DRAWINGS [0012] Figure 1 is a front view of the overall structure of the present invention;

and [0013] Figure 2 is a plan view showing the structure of the mixing tower of the present invention .

DETAILED DESCRIPTION OF THE INVENTION [0014] The present invention will be further described below with reference to the accompanying drawings .

[0015] As shown in figures 1-2, the pulverized biomass composite gasification combustion system includes a vertically arranged mixing tower 1 and a horizontally arranged combustion furnace 2, and a pulverized biomass inlet 11 is arranged at a top center of the mixing tower 1. A bottom of the mixing tower 1 is connected to a middle of the upper end of the combustion furnace 2, a front side of the combustion furnace 2 is provided with a hot air outlet 21, and a bottom of the combustion furnace 2 is provided with a reciprocating grate 22. An end of the reciprocating grate 22 is provided with a spiral slag release device 23. A uniform flow chamber 3 is further disposed in the mixing tower 1, and the pulverized biomass inlet 11 communicates with the uniform flow chamber 3.

A plurality of through holes 31 is defined in a sidewall of the uniform flow chamber 3, and all the through holes 31 are communicated with an inner cavity of the mixing tower 1 . A Sidewall of the mixing tower 1 is further provided with a primary air inlet pipe 12, a petroleum coke powder inlet pipe 13 and a secondary air inlet pipe 14 from top to bottom. The primary air inlet pipe 12 is in communication with the uniform flow chamber 3, and the petroleum coke powder inlet pipe 13 and the secondary air inlet pipe 14 are connected to the inner cavity of the mixing tower 1 respectively.

[0016] An injection direction of the primary air inlet pipe 12 is perpendicular to an injection direction of the pulverized biomass inlet 11, and an injection direction of the petroleum coke powder inlet pipe 13 is tangent to an outer sidewall of the uniform flow chamber 3. Moreover, the number of the petroleum coke powder inlet tubes 13 may be set to be plural, and they can be circumferentially distributed around the center of the mixing tower 1. An injection direction of the secondary air inlet pipe 14 is opposite to or perpendicular to the injection direction of the primary air inlet pipe 11.

[0017] 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 only allows injection into the interior of the mixing tower 1.

[0018] The bottom of the mixing tower 1 is funnel shaped.

[0019] The mixing tower 1 is further provided with a uniform air plate 4 which is placed in a lower portion of the mixing tower 1, and the uniform air plate 4 is provided with a plurality of evenly distributed uniform air holes 41.

[0020] Each through hole 31 has a diameter of 50 to 60mm, and each uniform air hole 41 has a diameter of 80 to 100mm.

[0021] The above description is only for 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 may be made and they are still fall within the scope of the invention and the description of the invention are still within the scope covered by the patent of the present invention .

Claims

1. A composite gasification and combustion system for pulverized biomass, comprising a vertically arranged mixing tower and a horizontally arranged combustion furnace, a pulverized biomass inlet being disposed at a top center of the mixing tower, and a bottom of the mixing tower being connected to a middle portion of an upper end of the combustion furnace, a bottom of the combustion furnace being provided with a reciprocating grate, a front side of the combustion furnace being provided with a hot air outlet, a uniform flow chamber being further disposed in the mixing tower the pulverized biomass inlet communicating with the uniform flow chamber, a plurality of through holes being defined in a sidewall of the uniform flow chamber all the through holes being communicated with an inner cavity of the mixing tower, a Sidewall of the mixing tower being further provided with a primary air inlet pipe, a petroleum coke powder inlet pipe and a secondary air inlet pipe respectively from top to bottom, the primary air inlet pipe being in communication with the uniform flow chamber, and the petroleum coke powder inlet pipe and the secondary air inlet pipe being connected to the inner cavity of the i

mixing tower respectively.

2. The composite gasification and combustion system for pulverized biomass as recited in claim 1, wherein an injection direction of the primary air inlet pipe is perpendicular to an injection direction of the pulverized biomass inlet, and an injection direction of the petroleum coke powder inlet pipe is tangent to an outer sidewall of the uniform flow chamber.

3. The composite gasification and combustion system for pulverized biomass as recited in claims 1 or 2, wherein an injection direction of the secondary air inlet pipe is opposite to or perpendicular to the injection direction of the primary air inlet pipe.

4. The composite gasification and combustion system for pulverized biomass as recited in claim 1, wherein 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 only allows injection into the interior of the mixing tower.

5. The composite gasification and combustion system for pulverized biomass as recited in claim 1, wherein the bottom of the mixing tower is funnel shaped.

6. The composite gasification and combustion system for pulverized biomass as recited in claim 1, wherein the mixing tower is further provided with a uniform air plate which is placed in a lower portion of the mixing tower, and the uniform air plate is provided with a plurality of evenly distributed uniform air holes.

7. The composite gasification and combustion system for pulverized biomass as recited in claim 1, wherein each through hole has a diameter of 50 to 60mm.

8. The composite gasification and combustion system for pulverized biomass as recited in claim 6, wherein each uniform air hole has a diameter of 80 to 100mm.