JPS5828905A - Multitubular type once-through boiler - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] This invention relates to a multi-tubular once-through boiler. The wood tubes conventionally used in multi-tubular once-through boilers are plain pipes, and have a small heat transfer area per unit volume. The disadvantage was that it required a large installation space.Also, to obtain a highly efficient boiler, an economizer or the like was used to recover heat from the exhaust gas.For example, an This was due to the header of the finned water pipe, the piping between the economizer and the boiler, etc., which significantly increased the cost. In consideration of the above points, this development wJi provides a low-cost, high-efficiency boiler with a small installation space. ◇ The feature of the multi-tube once-through boiler of this invention is that grooves are provided in a single water pipe in a spiral shape, and these wood pipes are closely connected to form an annular water pipe wall. A heat transfer accelerator plate with a roughly V-shaped cross section is installed in the valley of the part facing the outer wall. 1. A partition wall is provided at the lower part of the interior of the water pipe wall to horizontally partition the inside of the water pipe wall. 1. Hereinafter, embodiments of the present invention will be described based on the drawings.1 The upper header 1 and the lower header 2 are both annular IIc.
It is formed. These upper and lower headers 1.degree. 2 are connected by a large number of water pipes 3. These water pipes 3 are provided with an ATZ 4 in a spiral shape.

These water pipes 3 are closely spaced and arranged as an annular water pipe wall.In order to prevent the grooves from getting wedged between the water pipes, the pitch of the grooves must be alternately changed, or the grooves may be installed in opposite directions. It is desirable that the O grooves 4 are provided in a spiral shape for manufacturing purposes, but they may also be provided in the circumferential direction.The boiler outer wall 5 is provided at intervals on the outer wall of the water pipe wall, and the water pipe wall and the boiler outer wall are An annular combustion gas passage 6 is formed between the combustion gas passage 5 and the combustion gas passage 5. A combustion device 7 is provided inside the upper pipe header 1. A partition wall 8 is provided at a lower position inside the water pipe wall to horizontally partition the inside thereof, and a space above the partition wall 8 is formed into a combustion chamber 9. At the same time, the space below becomes flue 1.
0. A portion of the water pipe 3 below the partition wall 8 is a reduced diameter portion 11.

Fins 12 are attached to this reduced diameter portion 11 in the circumferential direction or in a spiral shape. In addition, heat transfer promoting plates 13 having a substantially V-shaped cross section are attached to the valleys of the portions of the water pipes 3 above the partition wall 8 facing the boiler outer wall 5. It is desirable to install it in close contact with the water pipe 3. To explain its function in the above configuration, first, the combustion gas generated in the combustion chamber 9 is connected to the water pipe 3 by radiant heat transfer.
It passes through the gap formed between the water pipe 3 and the heat transfer promotion plate 13, that is, the groove 4 provided at the mouth of the wood pipe, while exchanging heat, and reaches the annular combustion gas passage 6.
It flows from the outside to the inside through the reduced diameter section 11 of the wood pipe, where heat is exchanged again.

(The combustion gas at this time is Tob in Ω once i is exchanged.)
1, which is close to exhaust gas, ie, this finned diameter portion 11 plays the role of exhaust gas and exhaust gas economizer.

) and reaches the flue 10, where it is discharged to the outside at extremely low temperatures. .

As explained above, this invention has a groove in the wood pipe, a heat transfer promoting plate, and a fin on the reduced diameter part of the water pipe, so that the water pipe with one fin can be used as an exhaust gas economizer. Because it is structured with roles,
It is possible to provide a low-cost, high-efficiency boiler that requires a small installation space.

[Brief explanation of the drawing]

Figure 1 is a vertical sectional view showing an embodiment of the present invention, and Figure 2 is a cross section taken along line 471 of Figure 1 v! J% Figure 3 is a partially enlarged, large longitudinal cross-sectional view of the wood pipe. 0, 1 is the upper header, 2 is the lower header, 3 is the wood pipe, 4 is the groove, the outer wall of the assisted boiler, and 6 is the combustion gas passage. , 7 is a combustion device, 8 is a bulkhead, 9 is a combustion chamber, 10 is a flue, 11 is a reduced diameter part of a Fi water pipe, 12 is a fin, and 13 is a heat transfer accelerator plate.

Claims (1)

[Claims] Both the upper header 1 and the lower header 2 are formed in an annular shape, and the upper and lower headers 1 and 2 are connected by a large number of water pipes 3.1 The water pipes 3 are provided with grooves 4 in a spiral shape, and these water pipes 3 are closely connected. An annular combustion gas passage 6 is formed between the water pipe wall and the boiler outer wall 5, and an annular combustion gas passage 6 is formed between the water pipe wall and the boiler outer wall 5, and the boiler outside 115 is made of sand at intervals on the outside of the wood pipe wall. A combustion device 7 is installed inside the tank 1, and a partition wall 8 is provided below the water pipe wall to horizontally partition the inside of the water pipe wall, and the space above the partition wall 8 is formed into a combustion chamber 9. A space is formed in the flue 10, a portion of the water pipe 3 below the partition wall 8 is a reduced diameter portion 11, and a fin 12 is attached to this reduced diameter portion 11 in the circumferential direction or in a spiral shape.A portion of the water pipe 3 above the partition wall 8 A multi-tubular once-through boiler characterized in that a heat transfer promoting plate 13 having a substantially V-shaped cross section with a valley mK of a portion facing the boiler outer wall 5 side is attached.