Bubbling bed boiler for high-moisture fuel

Abstract

The utility model discloses a bubbling bed boiler for high-moisture fuel. The bubbling bed boiler comprises a platform support (1), a boiler body (2) is arranged on the platform support (1), a feeding port (3) is formed in the side portion of the boiler body (2), a combustor (4) and a buried pipe (5) are arranged on the lower portion of the boiler body (2), and a slag discharging bin (6) communicated with the boiler body (2) is arranged at the bottom of the boiler body (2). A flue (7) communicated with the boiler body (2) is transversely arranged on one side of the upper portion of the boiler body (2), a convection bank (8) is arranged in the flue (7), and an upper boiler barrel (9) and a lower boiler barrel (10) which are communicated with each other are arranged at the upper end and the lower end of the convection bank (8) respectively. The end part of the flue (7) is provided with a right-angle pipeline (11) which is communicated with the flue (7); the lower end of the right-angle pipeline (11) is sequentially provided with an economizer (12), an air pre-heater (13) and a smoke exhaust bin (14); according to the utility model, more space is provided for flue gas to flow so as to reduce abrasion, and the heat of the flue gas is fully absorbed in the process so as to improve the efficiency.

Description

TECHNICAL FIELD

[0001] The utility model relates to a boiler technical field especially relates to a kind of for high moisture content fuel's bubbling bed boiler. BACKGROUND

[0002] Bubbling bed boiler is the gas-solid flow in hearth under the state of bubbling fluidization combustion device, the existing bubbling bed boiler as shown in the Chinese utility model patent with announcement No.CN215489693U, including furnace body, burner, upper outlet and lower coal hole and other structures are made of high-temperature gas to make fuel tumble combustion, and its flue gas is discharged through upper outlet, and for high moisture content fuel, its flue gas is more than ordinary fuel, on the one hand, more flue gas can produce more wear to furnace body, on the other hand, more flue gas can carry more heat to discharge, and the single furnace body of existing device has enough space for flue gas to flow, and flue gas repeatedly flows in the interior to cause wear to increase, simultaneously, the device does not have heat absorption in flue gas, to cause that combustion efficiency is lower. SUMMARY

[0003] The utility model is to provide a kind of for high moisture content fuel's bubbling bed boiler.The utility model has more space for flue gas to flow and reduces wear, and the heat of flue gas is fully absorbed in process to improve efficiency.

[0004] The utility model discloses a kind of for high moisture content fuel's bubbling bed boiler, including platform support, platform support is equipped with furnace body, furnace body side is equipped with feed inlet, the lower portion of furnace body is equipped with burner and buried pipe, the bottom of furnace body is equipped with the communicating discharge slag bin;The upper portion of furnace body is equipped with the flue with furnace body intercommunication in one side transversely, and the flue is equipped with convection tube bundle, and the upper and lower ends of convection tube bundle are equipped with the upper drum and lower drum with intercommunication respectively;The end of the flue is equipped with the communicating elbow pipe, and the lower end of elbow pipe is sequentially equipped with economizer, air preheater and exhaust gas bin.

[0005] In the above-mentioned one for high moisture content fuel's bubbling bed boiler, the cross-sectional area of the inner cavity of the upper portion of the furnace body is greater than that of the lower portion.

[0006] In the above-mentioned one for high moisture content fuel's bubbling bed boiler, the burner is a hood burner.

[0007] In the above-mentioned one for high moisture content fuel's bubbling bed boiler, the air distribution device of the burner has a slag outlet.

[0008] In the above-mentioned one for high moisture content fuel's bubbling bed boiler, the buried pipe is located above the burner, and the feed inlet corresponds to the position of the buried pipe.

[0009] In the above-mentioned one for high moisture content fuel's bubbling bed boiler, the surface of the buried pipe has a wear-resistant layer.

[0010] The bottom of the lower drum is provided with a downcomer extending downward.

[0011] The corner of the right-angle pipe is provided with a bevel transition.

[0012] The inner wall of the furnace body is made of wear-resistant and high-temperature castable material.

[0013] Compared with the prior art, the fuel is placed into the feeding port, the fuel is fluidized and combusted by the combustor, the residue enters the residue discharge bin, the flue gas generated by combustion enters the flue from the top of the furnace body, the convection tube bundle in the flue absorbs the heat of the flue gas and is converted into water vapor through the upper drum and the lower drum to realize heat energy conversion; the flue gas continues to flow and enters the economizer and the air preheater through the right-angle pipe, the two further recycle heat, and finally the flue gas is discharged through the smoke discharge bin; the flue gas fully flows inside to evenly distribute the wear of each component, the service life is improved, and the heat in the flue gas is fully absorbed to improve the efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model.

[0015] The marks in the drawings are as follows: 1, platform support; 2, platform support; 3, feeding port; 4, combustor; 5, buried pipe; 6, residue discharge bin; 7, flue; 8, convection tube bundle; 9, upper drum; 10, lower drum; 11, right-angle pipe; 12, economizer; 13, air preheater; 14, smoke discharge bin; 15, lower residue port; 16, downcomer. DETAILED DESCRIPTION

[0016] The utility model will be further described below in combination with the drawings and examples, but it is not as the basis for limiting the utility model.

[0017] Embodiment: a bubbling bed boiler for high moisture fuel, comprising a platform support 1, a furnace body 2 fixed on the platform support 1, a feeding port 3 opened on the side of the furnace body 2, a spiral fixed-point feeding device for accurately calculating the feeding amount, a burner 4 and a buried pipe 5 assembled at the lower part of the furnace body 2, the liquid in the buried pipe absorbing the heat at the combustion position, transversely and uniformly arranged according to the calorific value characteristics of the fuel, thereby adjusting the temperature in the dense phase zone, a slag discharge bin 6 communicated with the bottom of the furnace body 2, a slag discharge port opened at the bottom of the slag discharge bin 6 for discharging the residue; the upper part of the furnace body 2 is transversely provided with a flue 7 communicated with the furnace body 2, the flue 7 is provided with a convection tube bundle 8, the upper end and the lower end of the convection tube bundle 8 are integrally provided with an upper drum 9 and a lower drum 10 communicated with each other, the heat of the flue gas flowing through the convection tube bundle is transferred to the liquid inside to form steam, and the gas-liquid conversion cycle is formed in the convection tube bundle through the heat difference before and after, the steam can be used for power generation components, which is a technical means familiar to and mastered by those skilled in the art, the convection tube bundle reduces the area variation rate of the flow passage to form a low flue gas flow rate, further reduces the abrasion and facilitates cleaning; the end of the flue 7 is provided with a straight pipe 11 communicated with the flue 7, the lower end of the straight pipe 11 is sequentially provided with an economizer 12, an air preheater 13 and a flue gas discharge bin 14, the economizer obtains the heat in the flue gas to heat the liquid therein, the liquid enters the lower drum through the pipeline (not shown in the figure), and the heat energy utilization rate is improved, due to the high moisture of the fuel, the temperature of the furnace body is reduced, in order to achieve better combustion effect, air with a certain temperature is needed to dry and assist combustion, therefore, the air preheater is added at the tail to generate high-temperature air to assist the combustion in the furnace, the air preheater obtains the heat in the flue gas and transfers it to the furnace body through the pipeline (not shown in the figure), so as to ensure the stable combustion inside and further improve the heat energy utilization rate; the cross-sectional area of the inner cavity of the upper part of the furnace body 2 is greater than that of the lower part of the furnace body 2, the larger furnace volume not only ensures the reasonable arrangement of the flue gas and air in the furnace body, but also ensures the load of the boiler through the increased heating surface; the burner 4 is a hat burner, which can effectively prevent the generation of deflected flow and channeling in the air flow and prevent the fuel from returning to the air pipe; the air distribution device of the burner 4 has a slag discharge port 15, so that the low-temperature agglomerates and slag blocks in the furnace body can be quickly discharged and the hat of the burner is not blocked; the buried pipe 5 is located above the burner 4, and the feeding port 3 corresponds to the position of the buried pipe 5, the fuel is fed into the furnace body through the fixed-point feeding, and the material distribution on the burner is balanced through the fluidization of the fluidized air of the lower burner, so that the combustion is more sufficient; the surface of the buried pipe 5 has a wear-resistant layer to improve the service life; the bottom of the lower drum 10 is provided with a downcomer 16 extending downward, which can be connected with a membrane water wall type partition wall (not shown in the figure) through a distribution pipe to further obtain the heat generated by the operation of the boiler, and the heat is converted into water vapor for use, so as to form a good water circulation system and avoid local heat transfer deterioration; the corner of the straight pipe 11 has a bevel transition to improve the smoothness of the flue gas flow.The inner wall of the furnace body 2 is wear-resistant and high-temperature-resistant castable, the temperature inside the furnace body is high, and the material concentration in the flue gas is very high, so the wear-resistant and high-temperature-resistant castable can effectively improve the wear-resistant and high-temperature-resistant effect of the dense phase zone and ensure stable operation.

[0018] Working principle: fuel is placed into the feeding port 3, the fuel is fluidized and combusted by the burner 4, the residue enters the residue discharge bin 6, the flue gas generated by combustion enters into the flue 7 from the top of the furnace body, the convection tube bundle 8 in the flue 7 absorbs the heat of the flue gas and is converted into water vapor through the upper drum 9 and the lower drum 10 to realize heat energy conversion; the flue gas continues to flow and changes direction through the elbow pipe 11 to enter the economizer 12 and the air preheater 13, both of which further recycle heat, and finally the flue gas is discharged through the flue gas discharge bin 14; the flue gas flows fully and widely inside, which evenly distributes the wear of each component and prolongs the service life, and the heat in the flue gas is fully absorbed to improve the efficiency.

[0019] The above embodiment only expresses the embodiment of the utility model, and the description is more specific and detailed, but it cannot be understood as the limitation of the utility model patent range, and in the embodiment, up, down, left, right, front, back only represent relative positions and not absolute positions. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which belong to the protection range of the utility model. Therefore, the protection range of the utility model patent should be subject to the appended claims.

Claims

1. A bubbling bed boiler for high-moisture fuel, comprising a platform support (1) on which a furnace body (2) is arranged, the side of the furnace body (2) is provided with a feeding port (3), the lower part of the furnace body (2) is provided with a burner (4) and a buried pipe (5), and the bottom of the furnace body (2) is provided with a communicating slag discharge bin (6); characterized in that: The upper side of the furnace body (2) is transversely provided with a flue (7) communicated with the furnace body (2), the flue (7) is provided with a convection tube bundle (8), the upper and lower ends of the convection tube bundle (8) are respectively provided with an upper drum (9) and a lower drum (10) communicated with each other; the end of the flue (7) is provided with a right-angle pipeline (11) communicated with each other, the lower end of the right-angle pipeline (11) is sequentially provided with an economizer (12), an air preheater (13) and a smoke exhaust bin (14).

2. A bubbling bed boiler for high-moisture fuel according to claim 1, characterized in that: The cross-sectional area of the inner cavity of the upper portion of the furnace body (2) is greater than that of the lower portion of the furnace body (2).

3. A bubbling bed boiler for high-moisture fuel according to claim 1, characterized in that: The burner (4) is a hood burner.

4. A bubbling bed boiler for high-moisture fuel according to claim 3, characterized in that: The air distribution device of the burner (4) is provided with a slag outlet (15).

5. A bubbling bed boiler for high-moisture fuel according to claim 1, characterized in that: The buried pipe (5) is located above the burner (4), and the feed inlet (3) corresponds to the position of the buried pipe (5).

6. A bubbling bed boiler for high-moisture fuel according to claim 1, characterized in that: The surface of the buried pipe (5) is provided with a wear-resistant layer.

7. A bubbling bed boiler for high-moisture fuel according to claim 1, characterized in that: The bottom of the lower drum (10) is provided with a downcomer (16) extending downward.

8. A bubbling bed boiler for high-moisture fuel according to claim 1, characterized in that: The corner of the right-angle pipeline (11) is provided with a bevel transition.

9. A bubbling bed boiler for high-moisture fuel according to claim 1, characterized in that: The inner wall of the furnace body (2) is made of wear-resistant and high-temperature castable.

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