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Boiler, and steam temperature adjusting method for boiler

A technology of steam temperature and adjustment method, which is applied in the direction of steam boilers, superheated temperature control, water tube steam boilers, etc. It can solve the problems of insufficient temperature, insufficient steam temperature, and no contribution to heat absorption, etc., to achieve efficient operation and expand controllability Effect of temperature range

Inactive Publication Date: 2010-09-01
MITSUBISHI HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, since the superheater 104 is a U-shaped structure, as Figure 7 As shown, when the combustion gas 120 bypasses the upper space A on the upper side of the superheater 104 as the bypass gas 113 instead of passing through the superheater 104, the combustion gas 120 flowing in the upper space A absorbs the superheater 104 Since heat does not contribute, there is a problem that heat exchange with the heat exchange tube group composed of the superheater 104 and the evaporator tube group 105 is not performed, and the heat exchange rate in the superheater 104 is reduced and the steam temperature is insufficient.
[0008] In addition, there is a problem that the steam temperature may fluctuate above the adjustment range of CDSH, that is, for example, may increase to 560°C or higher, or may be below 515°C, the temperature may be insufficient, and the rated operation may not be performed.

Method used

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  • Boiler, and steam temperature adjusting method for boiler
  • Boiler, and steam temperature adjusting method for boiler
  • Boiler, and steam temperature adjusting method for boiler

Examples

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Embodiment 1

[0050] A boiler according to Embodiment 1 of the present invention will be described with reference to the drawings.

[0051] The boiler of this embodiment and Figure 6 The shown conventional boilers have the same structure, so the same components are given the same reference numerals and repeated descriptions are omitted.

[0052] figure 1 It is a schematic diagram showing the structure of the boiler in Example 1 of the present invention.

[0053] Such as figure 1 As shown, the boiler 10A of this embodiment is configured so that the combustion gas generated by the combustion of the burner 101 flows from the furnace 102 through the superheater (SH) 104 and the evaporator tube group 105, wherein the upper part of the superheater 104 A downstream shielding plate 11A slidable in the vertical direction of the superheater 104 is provided on the downstream side (the downstream side) of the combustion gas to adjust the flow rate of the combustion gas entering the upper space A o...

Embodiment 2

[0069] refer to Figure 4 , the boiler of Example 2 of the present invention will be described.

[0070] Figure 4 It is a schematic diagram showing the structure of the boiler of this Example.

[0071] Since the structure of the boiler of this embodiment is the same as that of the boiler of Embodiment 1, the same reference numerals are assigned to the same components, and repeated descriptions are omitted.

[0072] Such as Figure 4 As shown, in the boiler 10B of this embodiment, in figure 1 In the illustrated boiler 10A, an upstream shielding plate 11B is provided on the upstream side of the combustion gas flowing above the superheater 104, and instead of the downstream shielding plate 11A provided on the downstream side of the combustion gas flowing above the superheater 104, it is provided with one end as a rotating position. The downstream part shielding plate 11C whose opening degree can be adjusted freely.

[0073] In addition, the opening degree of the downstream...

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Abstract

In a boiler arranged such that a combustion gas generated from a burner (101) flows from a furnace (102) through a superheater (SH)(104) and a steam pipe group (105), a downstream shield board (11A) slidable in the vertical direction of the superheater (104) is arranged on the slipstream side of the combustion gas above the superheater (104) in order to regulate the flow rate of the combustion gas entering into the upper space A of the superheater (104). The flow rate of a bypass gas (12) is regulated by the downstream shield board (11A) and the flow rate of a main flow gas (13) is regulated, thereby controlling the steam temperature of the superheater (104).

Description

technical field [0001] The present invention relates to a boiler configured to adjust the amount of combustion gas generated by combustion of a burner passing through the upper side of a superheater, and a method for adjusting the steam temperature of the boiler. Background technique [0002] Figure 6 An example of the structure of a marine boiler provided with a conventional superheater is shown. Such as Figure 6 As shown, the existing boiler 100 includes a burner 101 , a furnace 102 , a front grid tube 103 , a superheater (SuperHeater: SH) 104 and an evaporation tube group (back grid tube) 105 . The combustion gas 120 generated by the combustion of the burner 101 flows from the furnace 102 while exchanging heat with the front grid tube 103 , the superheater 104 , and the evaporation tube group 105 , and flows out from the gas outlet 107 through the outlet-side gas passage 106 . At this time, the steam collected by the steam drum 108 is supplied as a driving source to ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22G5/04F22G5/16
CPCF22B21/002F22B21/081F22G5/04
Inventor 今田润司永野英文
Owner MITSUBISHI HEAVY IND LTD