Water-cooling hearth structure of biomass gas fired boiler

Abstract

The utility model discloses a water-cooling hearth structure of a biomass gas fired boiler, and belongs to the technical field of biomass gas fired boilers. The water-cooling hearth comprises an upper-end hearth and a lower-end hearth, wherein the upper-end hearth is sequentially provided with a heat preservation layer and a supporting layer from top to bottom; and the lower-end hearth is arranged at the lower end of the supporting layer. The top and the two sides of the hearth are composed of the header and the membrane type wall structure, original heavy refractory brick furnace arches and furnace walls are replaced, pins are welded on the inner sides of the membrane type walls, and refractory concrete is poured on the inner sides of the membrane type walls. The novel structure has supporting performance, an arch foot support of a steel structure is not needed, the weight is greatly reduced, the sealing performance of the membrane type wall is better, and energy conservation and emission reduction are facilitated.

Description

Technical Field

[0001] This utility model belongs to the technical field of biomass gas boilers, specifically relating to a water-cooled furnace structure for a biomass gas boiler. Background Technology

[0002] With the advancement of national environmental protection policies, boiler emission requirements are becoming increasingly stringent. Biomass gas, as a renewable fuel, is gaining popularity due to its lower price than natural gas, lower pollutant emissions than biomass briquettes, and more complete combustion. However, biomass gas is produced through biomass gasification, and its calorific value is not high. To ensure stable combustion of biomass gas, the furnace is usually designed as an adiabatic combustion chamber.

[0003] like Figure 1 As shown, the existing furnace type has an insulated combustion chamber constructed of refractory bricks, including top insulation (11), refractory brick furnace arch (22), arch support (33), side wall refractory bricks (44), side wall insulation layer (55), bottom refractory layer (66), and bottom insulation layer (77). The existing furnace structure has the following disadvantages: 1. A large amount of refractory and insulation materials are required around the furnace, resulting in high costs; 2. The furnace arch is heavy and requires arch support, increasing the cost of steel structure materials and manufacturing; 3. The furnace arch operates at high temperatures for a long time, resulting in a short service life; 4. The furnace has poor sealing, which is not conducive to energy conservation and emission reduction. Utility Model Content

[0004] In view of the problems of the existing furnace structure mentioned in the background art, this utility model proposes a water-cooled furnace structure for a biomass gas boiler. The water-cooled furnace replaces the original bulky refractory brick furnace arch and furnace wall. The new structure itself is supportive and does not require steel arch support, thus significantly reducing weight. In addition, the membrane wall of this utility model has better sealing performance, which is conducive to energy conservation and emission reduction.

[0005] Technical solution: To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] A water-cooled furnace structure for a biomass gas-fired boiler, the water-cooled furnace comprising an upper furnace and a lower furnace, wherein the upper furnace is provided with an insulation layer and a support layer from top to bottom; and the lower furnace is located at the lower end of the support layer.

[0007] Preferably, the support layer includes an upper header, a membrane wall, pins, refractory concrete, and a lower header;

[0008] The membrane wall is located at the lower end of the insulation layer, the upper header is located at the upper end of the membrane wall, the lower header is located at the lower end of the membrane wall, the pin is located on the inner side of the membrane wall, and refractory concrete is poured on the inner side of the membrane wall.

[0009] As a preferred option, there are multiple pins and two lower headers.

[0010] Preferably, the lower furnace chamber is provided with a bottom refractory layer and a bottom insulation layer from top to bottom; the bottom refractory layer is located at the lower end of the membrane wall, and the bottom insulation layer is located between the two lower headers.

[0011] Preferably, the pin is triangular in shape and made of heat-resistant stainless steel.

[0012] Preferably, the pins are evenly distributed on the fire-facing surface of the membrane wall by welding.

[0013] Beneficial effects: Compared with the prior art, the present invention has the following advantages:

[0014] (1) The water-cooled furnace structure of the biomass gas boiler of this utility model is composed of a header and a membrane wall structure on the top and sides of the furnace. The inner side of the membrane wall is welded with pins and refractory concrete is poured.

[0015] (2) The water-cooled furnace of this utility model replaces the original bulky refractory brick furnace arch and furnace wall. The new structure itself has support and does not require steel arch foot support, thus greatly reducing the weight.

[0016] (3) The furnace arch and furnace wall of this utility model are well cooled, which extends the service life; and the membrane wall of this utility model has better sealing performance, which is conducive to energy conservation and emission reduction. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of the existing furnace chamber;

[0018] Figure 2 This is a cross-sectional view of the existing furnace lining.

[0019] Figure 3 This is a cross-sectional view of the water-cooled furnace structure of the biomass gas-fired boiler of this utility model;

[0020] In the diagram: 1. Upper header; 2. Membrane wall; 3. Pin; 4. Refractory concrete; 5. Insulation layer; 6. Bottom refractory layer; 7. Bottom insulation layer; 8. Lower header. Detailed Implementation

[0021] The present invention will be further illustrated below with reference to specific embodiments. The embodiments are implemented based on the technical solution of the present invention. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0022] like Figure 3As shown in the figure, the water-cooled furnace structure of the biomass gas boiler provided in this embodiment includes an upper furnace and a lower furnace. The upper furnace is provided with an insulation layer 5 and a support layer from top to bottom. The lower furnace is located at the lower end of the support layer.

[0023] like Figure 3 As shown, the support layer includes an upper header 1, a membrane wall 2, pins 3, refractory concrete 4, and a lower header 8. The membrane wall 2 is located at the lower end of the insulation layer 5, the upper header 1 is located at the upper end of the membrane wall 2, the lower header 8 is located at the lower end of the membrane wall 2, the pins 3 are located on the inner side of the membrane wall 2, and refractory concrete 4 is poured on the inner side of the membrane wall 2.

[0024] In this embodiment, there are multiple pins 3 and two lower headers 8.

[0025] like Figure 3 As shown, the lower furnace chamber is provided with a bottom refractory layer 6 and a bottom insulation layer 7 from top to bottom; the bottom refractory layer 6 is located at the lower end of the membrane wall 2, and the bottom insulation layer 7 is located between the two lower headers 8; the membrane wall 2 is tightly wrapped by the insulation layer 5 and the bottom insulation layer 7; the membrane wall 2 in this embodiment has better sealing performance, which is conducive to energy conservation and emission reduction.

[0026] In this embodiment, the pin 3 is triangular in shape. The pin is made of heat-resistant stainless steel round bar with a diameter of 6mm and a length of about 30mm. The included angle is 30° to 60°. The pin 3 is fixed to the fire-facing side of the membrane wall 2 by welding. The pins are evenly distributed at 100mm intervals. The pin 3 can help the refractory concrete 4 to adhere better to the surface of the membrane wall 2 and not easily fall off.

[0027] The furnace structure in this embodiment is suitable for biomass gas-fired boilers of different sizes of this type.

[0028] In this embodiment, multiple water pipes, made of circular seamless steel pipes, are evenly spaced inside the membrane wall 2. These water pipes are connected to the lower manifold 1 and the upper manifold 8 and are used for the collection and distribution of the working fluid in the system. The lower manifold 1 is used to distribute the cooling water entering the manifold to each pipe of the membrane wall 2, and the upper manifold 8 is used to collect the medium in all the pipes of the membrane wall 2.

[0029] In this embodiment, the membrane wall is formed by water pipes and lower manifold 1 and upper manifold 8 at the top and bottom. Lower manifold 1 sends incoming cold water into the water pipes of the membrane wall 2, dispersing the water and absorbing heat. The water is then collected and discharged through upper manifold 8, where it exchanges heat through the water pipes, effectively reducing the internal temperature; effectively protecting the insulation layer and fireproof concrete; and storing the heat in the form of hot water, saving energy—a win-win situation. The structure is rationally designed.

[0030] In this embodiment, the water pipes, including both the inlet and outlet pipes, are embedded in the insulation layer and fixed by fireproof concrete. The overall structure is stable and reliable, which is beneficial to the safe and economical operation of the boiler.

[0031] The working principle of this utility model is as follows: The furnace is a biomass gas fuel combustion zone, and the flame center temperature can reach 1200℃~1500℃. The existing furnace structure has no cooling, and the refractory material inside the furnace is easily burned by the flame. After adopting the improved water-cooled furnace of this embodiment, the cooling water can enter the lower headers 1 on both sides through the water inlet pipe, and fill the membrane wall 2 and the upper header 8 from bottom to top. The gate-shaped water cooling system composed of the headers and the membrane wall 2 encloses the flame. The high-temperature flame burning in the furnace heats the refractory concrete 4 and the membrane wall 2 of the furnace inner wall from the inside to the outside through radiation heat transfer, and exchanges heat with the medium (water) in the membrane wall 2. The heated water flows out from the top water outlet pipe, recovering heat while cooling the refractory concrete inside the furnace.

[0032] The water-cooled furnace of this invention replaces the original bulky refractory brick furnace arch and furnace wall. The new structure itself is supportive and does not require steel arch support, thus significantly reducing weight. In addition, the membrane wall of this invention has better sealing performance, which is conducive to energy conservation and emission reduction. This invention solves the shortcomings of the original furnace structure, such as bulkiness, short service life and poor sealing performance.

[0033] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A water-cooled furnace structure for a biomass gas-fired boiler, wherein the water-cooled furnace comprises an upper furnace chamber and a lower furnace chamber, characterized in that: The upper furnace chamber is provided with an insulation layer (5) and a support layer from top to bottom; the lower furnace chamber is located at the lower end of the support layer. The support layer includes an upper header (1), a membrane wall (2), pins (3), refractory concrete (4), and a lower header (8). The membrane wall (2) is located at the lower end of the insulation layer (5), the upper header (1) is located at the upper end of the membrane wall (2), the lower header (8) is located at the lower end of the membrane wall (2), the pin (3) is located on the inner side of the membrane wall (2), and refractory concrete (4) is poured on the inner side of the membrane wall (2).

2. The water-cooled furnace structure of the biomass gas boiler according to claim 1, characterized in that: There are multiple pins (3) and two lower boxes (8).

3. The water-cooled furnace structure of the biomass gas boiler according to claim 1, characterized in that: The lower furnace chamber is provided with a bottom refractory layer (6) and a bottom insulation layer (7) from top to bottom; the bottom refractory layer (6) is located at the lower end of the membrane wall (2), and the bottom insulation layer (7) is located between the two lower headers (8).

4. The water-cooled furnace structure of the biomass gas boiler according to claim 2, characterized in that: The pin (3) is triangular and made of heat-resistant stainless steel.

5. The water-cooled furnace structure of the biomass gas boiler according to claim 2, characterized in that: The pins (3) are evenly distributed on the fire-facing side of the membrane wall (2) by welding.

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