CN204693377U - High-moisture biomass fuel boiler - Google Patents

Abstract

The utility model discloses a biomass fuel boiler with high water content, which comprises a furnace and a flue. A plurality of headers are arranged on the furnace wall of the furnace and the flue wall, and an uncapped partition wall is arranged in the furnace to divide the furnace. The front supply area and the rear supply area, the lower part of the front supply area is equipped with a chain grate, the upper and middle parts of the rear supply area are placed horizontally in the rear supply area, and the upper drum and the lower drum are respectively provided. The upper part protrudes upwards and backwards and is connected to the upper drum through the header. There is a convection tube bundle and a partition between the upper drum and the lower drum. Air preheater, the upper part of the flue is connected to the lower part of the front supply area of the furnace, and the economizer is installed in the flue, and the economizer is connected to the upper drum through the header. The utility model can solve the problems that the existing biomass boiler burns and treats biomass raw materials with high water content such as traditional Chinese medicine waste residue, which is difficult to burn, the thermal efficiency is not high, and the smoke exhaust affects the environment.

Description

High water content biomass fuel boiler

technical field

The utility model relates to the technical field of biomass fuel equipment, in particular to a boiler for burning biomass fuel with high water content.

Background technique

Chinese herbal medicine waste residue and other resources have been wasted by people, causing a lot of environmental pollution. If it can be used as biomass to replace fossil fuels, it can reduce the content of carbon dioxide, sulfur dioxide, and nitrogen oxides in the atmosphere, which is beneficial to the protection of the ecological environment and economic development. , the implementation of energy sustainable development strategy has important practical significance.

However, at present, the implementation and utilization of Chinese herbal medicine waste residue as biomass energy in small and medium-sized enterprises in my country is still seldom. When the biomass raw material enters the furnace of the biomass boiler for combustion, the gas particles rise upwards, and after combustion and oxidation, they are discharged through the flue. Due to the relatively high water content of the Chinese herbal medicine waste residue, the combustion is difficult, the smoke is large, and the thermal efficiency is not high. The process of the smoke exhaust It will also take away a lot of heat, which not only causes heat pumping loss, but also increases the temperature of the surrounding air, causing pressure through the environment. In this way, biomass raw materials with high water content, such as Chinese herbal medicine waste, must be dried before entering the biomass boiler for combustion, and the drying process is easily restricted by natural climate conditions, especially in severe conditions (such as storms) , It is possible to get counterproductive results, and the labor intensity is high and the efficiency is low; if artificial drying is not affected by climate conditions, the drying time can be shortened, but additional energy is required.

Contents of the invention

The problem to be solved by the utility model is to provide a high water content biomass fuel boiler to solve the difficulty in burning biomass raw materials with high water content such as traditional Chinese medicine waste residue in the existing biomass boilers, the thermal efficiency is not high, and the smoke exhaust affects the environment The problem.

In order to solve the above problems, the technical solution of the utility model is: the high water content biomass fuel boiler includes a furnace and a flue, and a plurality of headers are arranged on the furnace wall and the flue wall of the furnace, and the furnace of the furnace The wall is a water-cooled membrane wall with cold water pipes. There is an uncapped partition wall inside the furnace. The water-cooled membrane wall at the front of the furnace and the partition wall form a front supply area. The membrane wall and the partition wall form a rear supply area, the lower part of the front supply area is provided with a chain grate, and the upper and middle parts of the rear supply area are horizontally placed on the rear supply area and respectively provided with upper drums and the lower drum, the upper part of the front supply area protrudes upwards and backwards and is connected to the upper drum through the header, and a convection tube bundle is provided between the upper drum and the lower drum for A partition for changing the direction of smoke, an ash hopper is provided between the partition wall and the water-cooled membrane wall at the rear of the furnace below the lower drum, and an air preheater is provided in the flue , the upper part of the flue is connected to the lower part of the front supply area of the furnace, an economizer is arranged in the flue, and the economizer is connected to the upper drum through the header.

In the above technical solution, a more specific solution may be: the front supply area is provided with a plurality of air distribution ports along the direction of the fire grate at the grate; the upper part of the rear supply area is flat and protrudes forward ; There are two air preheaters, which are respectively located at the upper part and the tail part of the flue.

Further: the air preheater is a tubular air preheater.

Further: there are six air distribution ports.

Due to the adoption of the above technical solution, the utility model has the following beneficial effects compared with the prior art:

1. The furnace of this high-moisture biomass fuel boiler adopts a double-supply area design. The upper part of the flue gas with a higher temperature is connected to the grate at the lower part of the front supply area. The high-temperature flue gas directly enters the furnace hall to participate in combustion, and the temperature of the furnace hall is high. The combustion is sufficient, the thermal efficiency has been improved, and the rear supply area is designed as a flat roof, which is conducive to sending high-temperature airflow and hot fuel to the front arch area, and the use of hot carbon particles and the high-temperature cyclone formed under the front arch area improves the front arch area. The temperature is favorable for the ignition of new fuel;

2. The upper and lower drums and convection tube bundles of the high-moisture biomass fuel boiler greatly increase the evaporation area, and the partitions for changing the direction of the flue gas make the flue gas flow horizontally, improve heat exchange, and can perform multiple times Heat exchange, heat exchange is sufficient; the furnace uses the cold water pipe of the model wall as the furnace wall, which can make the cooling water circulate, even if the water resources are fully utilized, and energy is saved.

Description of drawings

Fig. 1 is the front view of the utility model embodiment;

Fig. 2 is the sectional view of A-A and B-B of Fig. 1;

Fig. 3 is a cross-sectional view of C-C in Fig. 1 .

Detailed ways

Below in conjunction with accompanying drawing, the utility model embodiment is described in further detail:

As shown in Fig. 1, Fig. 2 and Fig. 3, the biomass fuel boiler with high water content includes a furnace and a flue 15, and a plurality of headers 5 are arranged on the furnace wall and the flue 15 wall.

The furnace wall of the furnace is a water-cooled membrane wall 3 with a cold water pipe, and an uncapped partition wall 6 is arranged in the furnace, and the upper part of the partition wall 6 is a heat-resistant brick. The water-cooled membrane wall 3 and the partition wall 6 at the front of the furnace form a front supply area 4, the water-cooled membrane wall 3 and the partition wall 6 at the rear of the furnace form a rear supply area 7, and the lower part of the front supply area 4 is equipped with a chain grate 1. The front supply area 4 is provided with six air distribution ports 2 along the direction of the fire grate 1 at the grate 1, and the heating section at the lower part of the front supply area 4 is divided into six areas: combustion heating, drying area, volatile matter precipitation, combustion Zone, oxidation zone, ash burnout zone, each zone is successively carried out along the stroke length of the grate, so that the combustion process of biomass fuel is zoned, and the air is supplied in different zones, so that the combustion is more complete. The upper part of the flue 15 is connected to the lower part of the supply area 4 in front of the furnace, and the high-temperature flue gas directly enters the furnace hall to participate in combustion. The temperature of the furnace hall is high, the combustion is sufficient, and the thermal efficiency is improved.

The upper part of the rear supply area 7 is flat and protrudes forward, which is conducive to sending high-temperature airflow and hot carbon particles to the front arch area, and the temperature of the front arch area is increased by using the hot carbon particles and the high-temperature cyclone formed under the front arch area , Favorable ignition of new coal. The upper and middle parts of the rear supply area 7 are horizontally placed on the rear supply area 7, and an upper drum 8 and a lower drum 12 are respectively provided. The upper part of the front supply area 4 protrudes upwards and backwards and is connected to the upper drum 7 through a header 5. Between the upper drum 8 and the lower drum 12, a convection tube bundle 9 and a partition 10 for changing the direction of smoke are arranged, and the position between the partition wall 6 and the water-cooled membrane wall 3 at the rear of the furnace is lower than the lower drum 12 An ash hopper 13 is provided. The setting of the convection tube bundle 9 and the partition plate 10 greatly increases the evaporation area, makes the flue gas wash and flow horizontally, improves the heat exchange, and can perform multiple heat exchanges, and the heat exchange is sufficient.

An air preheater 11 is arranged in the flue 15, and there are two air preheaters 11, which are respectively arranged on the upper part and the tail part of the flue 15, and the air preheater 11 is a tubular air preheater. The two air preheaters 11 are divided into two stages. The upper stage air preheater is located in the high temperature area of the tail shaft, and is introduced into the exhaust chamber of the chain furnace through the flue gas pipeline, where it can dry high-moisture fuel at high temperature and provide fuel for the combustion of the furnace hall. The hot air enables the fuel to be fully burned, improves the burnout rate of the fuel, and improves the thermal efficiency. There is an economizer 14 inside the flue 15, and the economizer 14 is connected to the upper drum 8 through the header 5. The economizer 14 is arranged in two stages, and the feed water is introduced into the economizer from the header at the inlet of the lower group of economizers The outlet header 5 is connected to the upper drum 8 through the water inlet pipe. The economizer 14 is arranged in the tail shaft of the boiler, that is, the flue 15. The low-temperature flue gas in the tail flue 15 heats the boiler feed water, and it absorbs The heat of the low-temperature flue gas reduces the exhaust gas temperature of the flue gas, saves energy and improves efficiency. On the furnace wall of the furnace, inspection doors, explosion-proof doors, fire viewing holes, measuring holes, etc. are set up where necessary. A soot blowing hole is reserved in the middle of the convection tube bundle.

Claims (4)

1. A biomass fuel boiler with high water content, comprising a furnace and a flue (15), characterized in that: multiple headers (5) are arranged on the walls of the furnace and the flue (15). The furnace wall of the furnace is a water-cooled membrane wall (3) with a cold water pipe, the furnace is provided with an uncapped partition wall (6), and the water-cooled membrane wall (3) at the front of the furnace is connected to the partition The wall (6) forms the front supply area (4), the water-cooled membrane wall (3) at the rear of the furnace and the partition wall (6) form the rear supply area (7), and the front supply area (4) The lower part is equipped with a chain grate (1), and the upper and middle parts of the rear supply area (7) are placed horizontally on the rear supply area (7). The upper drum (8) and the lower drum (12) are respectively provided. , the upper part of the front supply area (4) protrudes upwards and backwards and is connected to the upper drum (8) through the header (5), the upper drum (8) and the lower drum ( 12) There is a convection tube bundle (9) and a partition (10) for changing the direction of smoke, and the distance between the partition wall (6) and the water-cooled membrane wall (3) at the rear of the furnace is lower than the An ash hopper (13) is provided at the position of the lower drum (12), an air preheater (11) is provided in the flue (15), and the upper part of the flue (15) is connected to the furnace In the lower part of the front supply area (4), the flue (15) is provided with an economizer (14), and the economizer (14) is connected to the upper drum ( 8). 2. The high water content biomass fuel boiler according to claim 1, characterized in that: the front supply area (4) is provided with multiple an air distribution port (2); the upper part of the rear supply area (7) is flat and protrudes forward; the air preheater (11) has two, which are respectively arranged on the upper part and the upper part of the flue (15) tail. 3. The high water content biomass fuel boiler according to claim 1 or 2, characterized in that: the air preheater (11) is a tubular air preheater. 4. The high water content biomass fuel boiler according to claim 2, characterized in that there are six air distribution ports (2).