A direct-fired boiler

Abstract

This invention relates to the field of boiler technology and provides a direct-fired boiler, including an inner cylinder with a first end block at one end, a flue gas inlet at the end of the inner cylinder near the first end block, and a second end block at the end of the inner cylinder away from the first end block. The boiler also includes: an air intake assembly comprising an air inlet connected to a hollow connecting ring, with a plurality of air guide pipes arranged circumferentially along the hollow connecting ring, and a plurality of air-blowing inclined rods on the side of the air guide pipes pointing towards the axis of the inner cylinder; and a heat exchange assembly including a second heat exchange sleeve, with a first heat exchange sleeve sleeved outside the second heat exchange sleeve, and a channel at the second end block for conveying flue gas from the inner cylinder to the space between the first and second heat exchange sleeves. This device allows for multi-point rotary air distribution, ensuring thorough mixing of the distributed air with the combustible gas, resulting in more complete combustion and uniform heat exchange.

Description

Technical Field

[0001] This invention belongs to the field of boiler technology, and particularly relates to a direct-fired boiler. Background Technology

[0002] Heating is an essential necessity for homes. With the unpredictable nature of the climate, boiler heating has long been a basic necessity for residents. The most significant feature of direct-fired boilers is their membrane wall tube structure, which offers higher cleanliness and efficiency compared to traditional boilers, eliminating secondary pollution and ensuring complete combustion with high heat utilization. The use of staged combustion technology ensures uniform temperature rise within the heat storage chamber, excellent heat transfer, and reduced NOx formation.

[0003] However, existing direct-fired boilers may suffer from uneven air supply during use, resulting in incomplete combustion of combustible flue gas and affecting the thermal efficiency of the equipment. Summary of the Invention

[0004] The purpose of this invention is to provide a direct-fired boiler that addresses the problems mentioned in the background section.

[0005] The present invention is implemented as follows: a direct-fired boiler includes an inner cylinder, a first end block at one end of the inner cylinder, a flue gas inlet at the end of the inner cylinder near the first end block, and a second end block at the end of the inner cylinder away from the first end block. The boiler also includes: An air intake assembly, comprising an air inlet connected to a hollow connecting ring, a plurality of air guide pipes arranged in a circumferential ring along the inner cylinder of the hollow connecting ring, and a plurality of air blowing rods arranged on the side of the air guide pipes pointing towards the axis of the inner cylinder; and A heat exchange assembly includes a second heat exchange sleeve disposed outside the inner cylinder, a first heat exchange sleeve being sleeved on the outside of the second heat exchange sleeve, and a channel for conveying flue gas in the inner cylinder to the space between the first heat exchange sleeve and the second heat exchange sleeve being provided at the second end block.

[0006] In a further technical solution, both the first heat exchange sleeve and the second heat exchange sleeve are composed of several membrane wall tubes with interconnected sidewalls.

[0007] In a further technical solution, a hollow shaft is also installed in the inner cylinder, and the hollow shaft is connected to an external drive mechanism, which can rotate rapidly. The outer diameter of the hollow shaft is evenly welded with ratchet teeth.

[0008] The direct-fired boiler provided in this embodiment of the invention has the following beneficial effects: (1) The device can perform multi-point rotary cutting and air distribution, causing the flue gas to rotate like a tornado, and the air distribution and combustible gas are fully mixed, resulting in more complete combustion; (2) Using two layers of cylinders, the high-temperature flue gas is output from the center of the inner cylinder to the space between the inner and outer cylinders, resulting in uniform heat exchange. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of a direct-fired boiler provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the internal structure of a direct-fired boiler provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of a heat exchange component in a direct-fired boiler, provided as an embodiment of the present invention.

[0010] In the attached diagram: Inner cylinder 1; First end block 11; Second end block 12; Flue gas inlet 2; Air intake assembly 3; Air inlet 31; Air guide pipe 32; Air blowing slant rod 33; Hollow connecting ring 34; Heat exchange assembly 4; First heat exchange sleeve 41; Second heat exchange sleeve 42. Detailed Implementation

[0011] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0012] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0013] like Figure 1-3 As shown, a direct-fired boiler according to an embodiment of the present invention includes an inner cylinder 1, a first end block 11 disposed at one end of the inner cylinder 1, a flue gas inlet 2 disposed at the end of the inner cylinder 1 near the first end block 11, and a second end block 12 disposed at the end of the inner cylinder 1 away from the first end block 11. The boiler also includes: Air intake assembly 3, comprising an air inlet 31 connected to a hollow connecting ring 34, a plurality of air guide pipes 32 arranged in a ring around the inner cylinder 1, and a plurality of air blowing rods 33 arranged on the side of the air guide pipes 32 pointing toward the axis of the inner cylinder 1; and The heat exchange assembly 4 includes a second heat exchange sleeve 42 disposed outside the inner cylinder 1. A first heat exchange sleeve 41 is sleeved on the outside of the second heat exchange sleeve 42, and a channel for conveying flue gas in the inner cylinder 1 to the space between the first heat exchange sleeve 41 and the second heat exchange sleeve 42 is provided at the second end block 12.

[0014] In this embodiment of the invention, during use, combustible flue gas enters the inner cylinder 1 from the flue gas inlet 2. Simultaneously, air enters the hollow connecting ring 34 from the air inlet 31, then enters each air guide pipe 32 through the hollow connecting ring 34, and is then blown into the inner cylinder 1 through the air blowing angle rod 33 on the air guide pipe 32. Since the air blowing angle rod 33 adopts an inclined structure, it can disturb the flow direction of the flue gas, causing the flue gas to rotate like a tornado, and the air and combustible gas are fully stirred and mixed to maintain efficient combustion.

[0015] The high-temperature flue gas is output from the center of the inner cylinder 1 to the second end block 12. The flue gas can run through the channel in the second end block 12 to the space between the first heat exchange sleeve 41 and the second heat exchange sleeve 42, thereby achieving uniform heat exchange.

[0016] like Figure 1 and 3 As shown, in a preferred embodiment of the present invention, the first heat exchange sleeve 41 and the second heat exchange sleeve 42 are both composed of several membrane wall tubes with interconnected side walls, which have a large contact area with the flue gas and a good heat exchange effect.

[0017] In a preferred embodiment of the present invention, a hollow shaft is also installed in the inner cylinder 1, and the hollow shaft is connected to an external drive mechanism for rapid rotation. The outer diameter of the hollow shaft is uniformly welded with ratchet teeth to spread and loosen incompletely burned fuel, maintaining uniform thickness throughout. It can also break up existing slag lumps to prevent clumping.

[0018] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A direct-fired boiler, comprising an inner cylinder, characterized in that, A first end block is provided at one end of the inner cylinder, a flue gas inlet is provided at the end of the inner cylinder near the first end block, and a second end block is provided at the end of the inner cylinder away from the first end block. The system also includes: An air intake assembly, comprising an air inlet mounted on a first end block, the air inlet connected to a hollow connecting ring, a plurality of air guide pipes arranged in a circumferential ring along the inner cylinder on the hollow connecting ring, and a plurality of air blowing angle rods arranged on the side of the air guide pipes pointing towards the axis of the inner cylinder; and The heat exchange assembly includes a second heat exchange sleeve disposed outside the inner cylinder, and a first heat exchange sleeve is sleeved outside the second heat exchange sleeve. Both the first and second heat exchange sleeves are composed of several membrane wall tubes with interconnected side walls, and a channel for conveying flue gas in the inner cylinder to the space between the first and second heat exchange sleeves is provided at the second end block.

2. The direct-fired boiler according to claim 1, characterized in that, A hollow shaft is also installed in the inner cylinder, and the hollow shaft is connected to an external drive mechanism. The outer diameter of the hollow shaft is evenly distributed with ratchet teeth.

3. The direct-fired boiler according to claim 2, characterized in that, The hollow shaft and the ratchet teeth are connected by welding.

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