Light tube evaporator and biomass boiler

Abstract

The light tube evaporator comprises a water collecting pipe, a water distributing pipe, a membrane type water cooling wall and a densely-arranged convection bank, the water distributing pipe is provided with a first water pipe and a second water pipe, and the first water pipe and the second water pipe are arranged in a high-low staggered mode. According to the light pipe evaporator, the water collecting pipe, the water distributing pipe, the membrane water cooling wall and the densely-arranged convection bank are combined, and the water pipes which are staggered up and down are arranged in the water distributing pipe, so that the lower ash falling space is enlarged, dust in smoke can be settled more easily, the light pipe evaporator is suitable for being applied to a biomass boiler, and large-particle dust is prevented from being accumulated at the bottom of the evaporator; therefore, the heat transfer efficiency of the evaporator is further improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to evaporator technical field, concretely relates to a light pipe evaporator and biomass boiler. BACKGROUND

[0002] The biomass boiler is a kind of boiler, is called biomass boiler with biomass energy as fuel, is divided into biomass steam boiler, biomass hot water boiler, biomass hot air furnace, biomass heat transfer oil furnace, vertical biomass boiler, horizontal biomass boiler and so on.

[0003] Due to the fuel characteristics of biomass boiler being different from fossil fuel, the extinguishing mechanism, response speed and composition of extinguishing product of biomass fuel in the extinguishing process are also greatly different compared with fossil fuel, and show different extinguishing characteristics from fossil fuel.The extinguishing process of biomass fuel is mainly divided into two independent stages of volatilization and extinguishing of volatile matter and extinguishing and burning of coke, and the former accounts for about 10% of the extinguishing time, and the latter accounts for 90%, and the detailed extinguishing process is as follows: after fuel is sent into the extinguishing chamber, the fuel is heated and water is separated under the action of high temperature heat. Subsequently, as the temperature continues to rise, about 250 DEG C, thermal synthesis starts, volatile matter is separated and forms coke. Gaseous volatile matter and high-temperature air around are mixed first and then ignited and extinguished. Under normal circumstances, the coke is surrounded by volatile matter, and oxygen in the extinguishing chamber is not easy to penetrate to the outer surface of coke, so as long as the volatile matter is about to end, the oxygen in the air can also contact the outer surface of coke, and the coke starts to extinguish and produces ash from time to time. In the above process, the high-temperature flue gas carries fly ash and unburned carbon fragments, which fall gradually under the action of the convection tube bundle and fall into the ash hopper from the bottom of the convection tube bundle under the action of the ash blowing device.

[0004] In the prior art, the convection tube bundle is placed horizontally in the biomass boiler to exchange heat with high-temperature flue gas, such as CN101893234A discloses a biomass boiler capable of realizing combined combustion of synthesis gas and semi-coke, CN116241876A discloses a gas-solid two-phase high-efficiency combustion biomass boiler, CN117823886A discloses a biomass boiler structure with a gasification chamber, etc., and the evaporator is rarely used in the flue gas for heat exchange, and the steam generator is generally used in the gas boiler, so there is an urgent need for a light pipe evaporator that can be used in the biomass boiler. UTILITY MODEL CONTENTS

[0005] In order to overcome the shortcomings of the prior art, one of the purposes of the utility model is to provide a light pipe evaporator to solve the above-mentioned traditional problems.

[0006] One of the purposes of the utility model is to provide a biomass boiler using the light pipe evaporator.

[0007] One of the purposes of the utility model is realized by adopting the following technical scheme:

[0008] A light pipe evaporator, comprising a water collecting pipe, a water distributing pipe, a membrane water cooling wall connecting the water collecting pipe and the water distributing pipe, and a densely arranged convection pipe bundle, wherein the water distributing pipe is provided with a first water pipe and a second water pipe, and the first water pipe and the second water pipe are arranged in a high-low staggered manner.

[0009] Preferably, the first water pipe is an arc-shaped pipe, and the second water pipe is a straight pipe.

[0010] Preferably, the arc-shaped height of the first water pipe is greater than 1.5-3 times the gap between the densely arranged convection pipe bundle.

[0011] Preferably, the arc-shaped pipe is an arch-shaped pipe.

[0012] Preferably, the membrane water cooling wall comprises a main body portion and a bending portion arranged at opposite ends of the main body portion, the main body portion has a first gap with the densely arranged convection pipe bundle, and the bending portion has a second gap with the densely arranged convection pipe bundle, and the first gap is smaller than the second gap.

[0013] Preferably, the bending portion has an outward bending structure, and the bending angle of the bending portion is 140°-160°.

[0014] Preferably, the light pipe evaporator further comprises a holder for clamping on the densely arranged convection pipe bundle.

[0015] The second purpose of the utility model is realized by adopting the following technical scheme:

[0016] A biomass boiler comprising the light pipe evaporator.

[0017] Compared with the prior art, the utility model has the beneficial effects that:

[0018] The light pipe evaporator of the utility model combines the water collecting pipe, the water distributing pipe, the membrane water cooling wall and the densely arranged convection pipe bundle, sets the water pipes in a high-low staggered manner in the water distributing pipe, increases the lower dust falling space, is more conducive to the settlement of dust in flue gas, is suitable for application in a biomass boiler, avoids the accumulation of large-particle dust at the bottom of the evaporator, and affects the heat transfer effect, thereby further improving the heat transfer efficiency of the evaporator. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a perspective view of the light pipe evaporator of the utility model;

[0020] Figure 2 It is a perspective view of the light pipe evaporator of the utility model; Figure 1 It is a first sectional view of the light pipe evaporator shown in the figure.

[0021] Figure 3 For Figure 1 Figure 2 is a second sectional view of the light pipe evaporator shown in Figure 1.

[0022] In the figure: 10, water collecting pipe; 20, water distributing pipe; 21, first water pipe; 22, second water pipe; 30, membrane water cooling wall; 31, main body part; 32, bending part; 40, closely arranged convection tube bundle; 50, holder. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings. In the following description, a large number of specific details are set forth in order to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0024] In the description of the present application, it should be understood that the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0025] In the description of the present application, it should be understood that when an element is considered to be "connected" to another element, it can be directly connected to another element or there can be an intermediate element. In contrast, when the element is referred to as "directly" connected to another element, there is no intermediate element.

[0026] Please refer to Figures 1-3 The light pipe evaporator of the preferred embodiment of the present application is used for installing in a biomass boiler and performing heat exchange with high-temperature flue gas containing dust or unburned carbon residue. Specifically, the light pipe evaporator comprises a water collecting pipe 10, a water distributing pipe 20, a membrane water cooling wall 30 connecting the water collecting pipe 10 and the water distributing pipe 20, and a closely arranged convection tube bundle 40. The water distributing pipe 20 is provided with a first water pipe 21 and a second water pipe 22. The first water pipe 21 and the second water pipe 22 are arranged in high-low staggered manner.

[0027] The light pipe evaporator combines the water collecting pipe 10, the water distribution pipe 20, the membrane water cooling wall 30 and the closely arranged convection pipe bundle 40, the water pipes with high and low staggered positions are arranged in the water distribution pipe 20, the lower dust falling space is increased, the dust in the flue gas is more conducive to settlement, the light pipe evaporator is suitable for application in the biomass boiler, the accumulation of large particle dust at the bottom of the evaporator is avoided, and the heat transfer effect is affected, and the heat transfer efficiency of the evaporator is further improved.

[0028] In one embodiment, the first water pipe 21 is an arc-shaped pipe, and the second water pipe 22 is a straight pipe, that is, through the height difference between the arc-shaped structure and the straight pipe, a dust falling space more in line with dust settlement is formed. Optionally, the arc-shaped height of the first water pipe 21 is 1.5-3 times greater than the gap between the closely arranged convection pipe bundle 40. In other embodiments, the first water pipe 21 can also be a pipe with other shapes, such as a triangular shape, a trapezoidal shape, etc. In this embodiment, the arc-shaped pipe is an arch-shaped pipe to facilitate water circulation.

[0029] In one embodiment, the membrane water cooling wall 30 includes a main body part 31 and a bending part 32 arranged at opposite ends of the main body part 31, the main body part 31 has a first gap with the closely arranged convection pipe bundle 40, and the bending part 32 has a second gap with the closely arranged convection pipe bundle 40, the first gap is smaller than the second gap, which is conducive to reducing the middle space and facilitating heat exchange in the middle.

[0030] Optionally, the bending part 32 is outwardly bent, and the bending angle of the bending part 32 is 140°-160°, so as to increase the dust falling space between the closely arranged convection pipe bundle 40 and also buffer the water in the pipe, improve the heat exchange performance of the outer wall, and in other embodiments, the top of the membrane water cooling wall 30 is not bent, which will not be described here.

[0031] In this embodiment, the light pipe evaporator further includes a holder 50 for clamping on the closely arranged convection pipe bundle 40 to ensure that the gaps between the closely arranged convection pipe bundles are consistent and facilitate flue gas circulation.

[0032] In other embodiments, the utility model also provides a biomass boiler adopting the light pipe evaporator of the above-mentioned embodiments, through the effect of the light pipe evaporator, the dust in the flue gas is conducive to settlement, so as to improve the heat exchange efficiency between the high-temperature flue gas and the evaporator, thereby improving the thermal efficiency of the biomass boiler.

[0033] The technical features of the above-mentioned embodiments can be combined arbitrarily, in order to make the description simple, all possible combinations of the technical features in the above-mentioned embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0034] The above-described embodiments only express several implementation manners of the utility model, the description is more specific and detailed, but can not therefore be understood as the limitation of the utility model patent range. It should be pointed out that for ordinary skilled person in the art, without departing from the utility model concept, several 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 light pipe evaporator characterized in that, The water collecting pipe, the water distributing pipe, the membrane water cooling wall connecting the water collecting pipe and the water distributing pipe, and the closely arranged convection pipe bundle are provided.

2. The light pipe evaporator of claim 1, wherein, The first water pipe is an arc-shaped pipe, and the second water pipe is a straight pipe.

3. The light pipe evaporator of claim 2, wherein, The arc-shaped height of the first water pipe is greater than 1.5-3 times of the gap between the closely arranged convection pipe bundle.

4. The light pipe evaporator of claim 2, wherein, The arc-shaped pipe is an arch-shaped pipe.

5. The light pipe evaporator of claim 1, wherein, The membrane water cooling wall comprises a main body part and bending parts arranged at opposite ends of the main body part.

6. The light pipe evaporator of claim 5, wherein, The bending parts have an outward bending structure, and the bending angle of the bending parts is 140-160 degrees.

7. The light pipe evaporator of claim 1, wherein, The light pipe evaporator further comprises a holder for clamping on the closely arranged convection pipe bundle.

8. A biomass boiler, characterized by The light pipe evaporator comprises the light pipe evaporator according to any one of claims 1-7.

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