Boiler equipment and steam temperature adjusting method thereof
By setting up a steam heat exchanger in the boiler equipment, the reheated steam in the high-temperature reheater is used to heat the superheated steam, which solves the problem of difficulty in adjusting the steam temperature of the secondary reheat boiler under medium and low loads, and achieves a high steam temperature Flexible adjustment and improvement of boiler operating efficiency.
Patent Information
- Application Number
- CN202411458358.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-18
- Publication Date
- 2025-01-24
AI Technical Summary
The secondary reheating boiler has difficulty in adjusting the steam temperature in the medium and low load stage, especially the reheating steam temperature is difficult to reach the design value, which affects the unit efficiency.
By setting up the steam heat exchanger in the boiler equipment, the part of the heating steam in the high temperature reheat in the high temperature rehearsal is connected to the steam heat exchanger through the bypass roadside to heat the overheated steam, thereby increasing the overheating steam and the re -heat steam temperature.
A flexible adjustment of the steam temperature under different loads meets the adjustment needs of the steam temperature, and improves the operating efficiency of boiler equipment.
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Figure CN119353671A_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the technical field of boilers, and in particular to a boiler device, and to a steam temperature regulating method of the boiler device. Background Art
[0002] As one of the most advanced and feasible coal-fired power generation technologies, ultra-supercritical secondary reheat technology is of great significance to improve the power generation efficiency of thermal power units, reduce energy consumption, reduce pollutant emissions, and develop high-parameter and large-capacity secondary reheat units. Compared with the primary reheat boiler, the secondary reheat boiler has an additional set of reheater heating surfaces, including the superheating system, the primary reheating system and the secondary reheating system. The boiler structure is more complicated, and the heat absorption of each heating surface has also changed, which brings many problems to the design and operation of the secondary reheat boiler. From the operating status of the domestic units put into operation, there are different degrees of low reheat steam temperature problems, especially in the medium and low load stages, which cannot fully meet the steam temperature regulation requirements. In addition, the regulation of superheated steam, primary reheat steam, and secondary reheat steam temperature is also more complicated.
[0003] In the context of deep peak regulation, high-parameter and large-capacity units often operate at low loads. Due to uneven heat distribution and deviations in the design of the heating surface ratio, the operating secondary reheat units often have low main steam and reheat steam temperatures. How to ensure the reheat steam temperature has become an important issue. Units frequently operate at low loads. Due to the design of the heating surface and other reasons, the boiler steam temperature (mainly the reheat steam temperature) at low loads is difficult to reach the design value, which directly affects the unit efficiency. In addition, the regulation of the three steam temperatures of main steam, primary reheat steam, and secondary reheat steam is a difficult problem for secondary reheat boilers, and the outlet temperature regulation of the three steam types is complex. Summary of the invention
[0004] A technical problem to be solved by the present disclosure is: how to achieve steam temperature regulation of boiler equipment.
[0005] To solve the above technical problems, an embodiment of the present disclosure provides a boiler equipment, which includes a furnace wall surrounding a furnace, a superheated steam pipeline partially arranged in the furnace wall, and a reheated steam pipeline arranged in the furnace wall, the superheated steam pipeline includes a primary superheater arranged in the furnace wall and a steam heat exchanger located upstream of the primary superheater, the reheated steam pipeline includes a high-temperature reheater arranged in the furnace wall, the steam heat exchanger includes a first fluid pipeline connected to the primary superheater and a second fluid pipeline bypassed to the high-temperature reheater through a bypass pipeline, and a regulating valve is provided on the bypass pipeline to adjust the flow rate.
[0006] In some embodiments, the reheat steam pipeline includes a primary reheat steam pipeline and a secondary reheat steam pipeline, the primary reheat steam pipeline includes a primary high-temperature reheater and a primary low-temperature reheater connected in sequence, and the secondary reheat steam pipeline includes a secondary high-temperature reheater and a secondary low-temperature reheater connected in sequence.
[0007] In some embodiments, the second fluid line is bypassed to the primary high temperature reheater through the bypass line.
[0008] In some embodiments, the second fluid line is bypassed to the secondary high temperature reheater through the bypass line.
[0009] In some embodiments, the superheated steam pipeline also includes a secondary superheater and a tertiary superheater arranged in the furnace wall, and the primary superheater, the secondary superheater and the tertiary superheater are connected in sequence.
[0010] In some embodiments, the tertiary superheater is located on the upper side of the primary superheater, and the secondary superheater is located on the upper side of the tertiary superheater.
[0011] In some embodiments, the primary high temperature reheater and the secondary high temperature reheater are disposed between the tertiary superheater and the secondary superheater.
[0012] In some embodiments, the primary low-temperature reheater and the secondary low-temperature reheater are arranged on the upper side of the secondary superheater.
[0013] In some embodiments, the furnace further includes an economizer disposed on the upper portion of the furnace wall.
[0014] In addition, an embodiment of the present disclosure provides a method for regulating the steam temperature of a boiler device, wherein the boiler device described in the above scheme is used.
[0015] Through the above technical solution, part of the reheated steam is drawn from the high-temperature reheater to heat the superheated steam through the steam heat exchanger, so that the temperature of the superheated steam and the reheated steam can be increased at the same time to meet the steam regulation requirements under different loads. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0017] Figure 1 is a structural schematic diagram of a boiler structure according to an embodiment of the present disclosure; Figure 2 is a structural schematic diagram of a boiler structure of another embodiment of the present disclosure; Figure 3 It is the flow chart of the heated surface verification calculation.
[0018] Description of reference numerals: 1-furnace wall, 2-primary superheater, 3-tertiary superheater, 4-primary high-temperature reheater, 5-secondary high-temperature reheater, 6-secondary superheater, 7-primary low-temperature reheater, 8-secondary low-temperature reheater, 9-economizer, 10-steam heat exchanger, 11-regulating valve, 12-bypass pipeline. DETAILED DESCRIPTION
[0019] The following is a further detailed description of the embodiments of the present disclosure in conjunction with the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to exemplarily illustrate the principles of the present disclosure, but cannot be used to limit the scope of the present disclosure. The present disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.
[0020] The present disclosure provides these embodiments to make the present disclosure thorough and complete, and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values set forth in these embodiments should be interpreted as being merely exemplary, and not as limiting.
[0021] It should be noted that, in the description of the present disclosure, unless otherwise specified, the meaning of "multiple" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present disclosure. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.
[0022] In addition, the words "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. "Vertical" does not mean vertical in the strict sense, but is within the tolerance range. "Parallel" does not mean parallel in the strict sense, but is within the tolerance range. "Include" or "comprising" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.
[0023] It should also be noted that in the description of the present disclosure, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.
[0024] All terms used in the present disclosure have the same meanings as those understood by those of ordinary skill in the art to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, for example, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined as such herein.
[0025] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.
[0026] The present scheme discloses a boiler device, which includes a furnace wall 1 that encloses a furnace, a superheated steam pipeline partially arranged in the furnace wall 1, and a reheated steam pipeline arranged in the furnace wall 1. The superheated steam pipeline includes a primary superheater 2 arranged in the furnace wall 1 and a steam heat exchanger 10 located upstream of the primary superheater 2. The reheated steam pipeline includes a high-temperature reheater arranged in the furnace wall 1. The steam heat exchanger 10 includes a first fluid pipeline connected to the primary superheater 2 and a second fluid pipeline bypassed to the high-temperature reheater through a bypass pipeline 12. A regulating valve 11 is provided on the bypass pipeline 12 to adjust the flow rate.
[0027] The steam heat exchanger 10 includes a first fluid pipeline and a second fluid pipeline. The two fluid pipelines are in thermal contact with each other but not connected. Part of the steam in the high-temperature reheater can enter the second fluid pipeline through the bypass pipeline 12. The first fluid pipeline allows superheated steam to flow, so that part of the reheated steam can be allowed to heat the superheated steam to preliminarily increase the temperature of the superheated steam. The superheated steam then enters the primary superheater 2 for heating. The reheated steam in the second fluid pipeline can be sent to the heat network heat exchanger or other heat exchange equipment for heating.
[0028] Since the temperature of the filtered steam is heated by the reheated steam, the heat absorbed by it in the primary superheater 2 is reduced, that is, the heat absorbed by the primary superheater 2 in the furnace is reduced. Accordingly, the heat absorption of the high-temperature reheater can be increased to increase the heat of the reheated steam.
[0029] In addition, since part of the reheated steam is extracted from the high temperature reheater, the flow rate of the reheated steam in the reheated steam pipeline is reduced, and the temperature of the reheated steam can also be increased. The bypass line 12 can be connected to the inlet of the high temperature reheater to extract part of the reheated steam to prevent this part of the steam from entering the high temperature reheater and absorbing heat.
[0030] The amount of high-temperature superheated steam extracted is adjusted by the regulating valve 11 on the bypass line 12, thereby changing the heat exchange in the steam heat exchanger and the effect of increasing the temperature of the low-temperature reheated steam. For example, when the unit is running at high load and the reheated steam temperature can basically meet the design value, the flow rate of high-temperature superheated steam extracted can be reduced. When the unit is running at low load, the reheated steam temperature cannot reach the design value. At this time, more high-temperature superheated steam can be extracted as needed. Therefore, the purpose of steam temperature regulation under different loads can be met.
[0031] In this scheme, part of the reheated steam is drawn from the high-temperature reheater through a steam heat exchanger to heat the superheated steam, which can simultaneously increase the temperature of the superheated steam and the reheated steam to meet the steam regulation requirements under different loads.
[0032] In some embodiments, the reheat steam pipeline includes a primary reheat steam pipeline and a secondary reheat steam pipeline, the primary reheat steam pipeline includes a primary high temperature reheater 4 and a primary low temperature reheater 7 connected in sequence, and the secondary reheat steam pipeline includes a secondary high temperature reheater 5 and a secondary low temperature reheater 8 connected in sequence. The primary high temperature reheater 4 and the primary low temperature reheater 7 are connected in series in sequence and arranged in the furnace wall, and the secondary high temperature reheater 5 and the secondary low temperature reheater 8 are connected in series with each other and arranged in the furnace wall. The primary reheat steam pipeline can be connected to the super high pressure cylinder of the steam turbine to receive the primary reheat steam, and the secondary reheat steam pipeline can be connected to the high pressure cylinder of the steam turbine to receive the secondary reheat steam.
[0033] In some embodiments, the second fluid pipeline is bypassed to the primary high-temperature reheater 4 through the bypass pipeline 12. Figure 1As shown, part of the primary reheat steam in the primary high temperature reheater 4 enters the second fluid pipeline through the bypass line 12 to heat the superheated steam in the first fluid pipeline, so that the temperature of the superheated steam is initially increased. Accordingly, due to the initial increase in temperature, the heat absorbed by the superheated steam in the primary superheater 2 is reduced, the heat that the primary high temperature reheater 4 can absorb in the furnace is increased, and the primary reheat steam flow in the primary high temperature reheater 4 is reduced, so that the temperature of the primary reheat steam is increased. For example, when the boiler equipment is at a load of 30%, the steam in the primary high temperature reheater 4 is extracted at 48-52t / h and transported to the second fluid pipeline, preferably 50t / h.
[0034] In some other embodiments, the second fluid pipeline is bypassed to the secondary high-temperature reheater 5 through the bypass pipeline 12. Figure 2 As shown, part of the secondary reheat steam in the secondary high temperature reheater 5 enters the second fluid pipeline through the bypass line 12 to heat the superheated steam in the first fluid pipeline, so that the temperature of the superheated steam is initially increased. Accordingly, due to the initial increase in temperature, the heat absorbed by the superheated steam in the primary superheater 2 is reduced, the heat that the secondary high temperature reheater 5 can absorb in the furnace is increased, and the secondary reheat steam flow in the secondary high temperature reheater 5 is reduced, so that the temperature of the secondary reheat steam is increased. For example, when the boiler equipment is at a load of 30%, the steam in the secondary high temperature reheater 5 is extracted at 48-52t / h and transported to the second fluid pipeline, preferably 50t / h.
[0035] In the above two different embodiments, only the primary reheat steam in the primary high-temperature reheater 4 and the secondary reheat steam in the secondary high-temperature reheater 5 are respectively derived through the bypass line 12 to heat the superheated steam. Of course, in other embodiments, the primary reheat steam and the secondary reheat steam can also be derived at the same time to heat the superheated steam, and accordingly, the temperatures of the primary reheat steam and the secondary reheat steam can be increased.
[0036] In addition, in some embodiments, the superheated steam pipeline further includes a secondary superheater 6 and a tertiary superheater 3 disposed in the furnace wall 1, and the primary superheater 2, the secondary superheater 6 and the tertiary superheater 3 are connected in sequence. The primary superheater 2, the secondary superheater 6 and the tertiary superheater 3 are connected in series in sequence to allow superheated steam to flow through, thereby heating the superheated steam.
[0037] In some embodiments, the third-stage superheater 3 is located on the upper side of the first-stage superheater 2, and the second-stage superheater 6 is located on the upper side of the third-stage superheater 3. Figure 1 and Figure 2As shown, the primary superheater 2, the tertiary superheater 3 and the secondary superheater 6 are arranged in sequence in the furnace wall 1 from bottom to top.
[0038] In some embodiments, the primary high-temperature reheater 4 and the secondary high-temperature reheater 5 are disposed between the tertiary superheater 3 and the secondary superheater 6. Figure 1 and Figure 2 As shown, the primary high temperature reheater 4 and the secondary high temperature reheater 5 are located between the tertiary superheater 3 and the secondary superheater 6 in the height direction. The primary high temperature reheater 4 and the secondary high temperature reheater 5 are approximately at the same level.
[0039] In some embodiments, the primary low-temperature reheater 7 and the secondary low-temperature reheater 8 are arranged on the upper side of the secondary superheater 6. Figure 1 and Figure 2 As shown, the primary low-temperature reheater 7 and the secondary low-temperature reheater 8 are approximately at the same level and are located on the upper side of the secondary superheater 6 .
[0040] In addition, in some embodiments, the boiler equipment further includes an economizer 9 disposed on the upper part of the furnace wall 1. The economizer 9 is located on the upper side of the primary low-temperature reheater 7 and the secondary low-temperature reheater 8, and the superheated steam can first flow through the economizer 9 and then enter the first fluid pipeline of the steam heat exchanger 10.
[0041] On the other hand, the present invention also provides a method for regulating the steam temperature of a boiler device, wherein the boiler device described in the above embodiment is used. By adjusting the regulating valve 11, the temperature of the superheated steam and the reheated steam can be adjusted to meet different working conditions.
[0042] Example 1: Extracting high-temperature reheater outlet steam to heat superheated steam After extracting the outlet steam of the primary high-temperature reheater 4 to heat the inlet steam of the primary superheater 2, the inlet steam temperature of the superheater increases, the heat absorption of the superheater decreases, and the heat absorption of the reheater increases, so that the temperature of the reheated steam is also increased, which also affects the boiler efficiency, turbine heat rate, power generation coal consumption, etc.
[0043] Taking 30% load as an example, the steam temperature at the outlet of the primary reheater is 603℃ and the pressure is 3.218MPa. 50t / h of this steam is extracted to heat the steam at the inlet of the primary superheater. The steam temperature at the inlet of the primary superheater is about 325℃, which can increase the temperature of the superheated steam. The reheated steam after heat exchange goes to the heat network for heating.
[0044] The following verification calculation method is used to solve the changes in the heat absorption of each heating surface and the steam parameters after the steam at the outlet of the primary reheater is extracted to heat the superheated steam. The verification calculation process of the heating surface is as follows: Figure 3 shown.
[0045] The calculated changes in the inlet and outlet flue gas temperatures and inlet and outlet steam parameters of the superheater before and after the extraction of the first reheat steam to heat the superheated steam are shown in Table 1.
[0046] Table 1 Changes in superheated steam parameters before and after extracting reheated steam to heat superheated steam
[0047] It can be seen from the calculation results that after the steam temperature at the superheater inlet is increased, the main steam temperature also increases accordingly, and the main steam temperature increases by 12°C. In addition, since the steam source for extraction is the outlet of the primary high-temperature reheat steam, the steam flow entering the secondary reheater of the boiler is reduced, which increases the temperature of the secondary reheat steam and reduces the work done by the medium and low pressure cylinders of the steam turbine; in addition, due to the increase in the flue gas temperature of the primary reheater, the temperature of the primary reheat steam will also increase. The changes in the parameters of the primary and secondary reheat steam before and after the extraction of the primary reheat steam to heat the superheated steam are shown in Table 2.
[0048] Table 2 Changes in the parameters of the first and second reheat steam before and after the first reheat steam is extracted to heat the superheated steam
[0049] The heat absorption of the secondary reheat steam before extraction is 1914 kJ / kg, while the heat absorption of the secondary reheat steam after extraction is 2146.8 kJ / kg, an increase of 232.8 kJ / kg, and the outlet temperature of the secondary reheat steam also increased by 32°C.
[0050] In addition, after extracting the reheated steam once to heat the superheated steam, the amount of steam entering the low-pressure cylinder of the steam turbine to do work is small, which reduces the power generation of the steam turbine unit, and the power generation coal consumption and turbine heat rate increase slightly. The turbine heat rate increased by 4.4%, and the power generation coal consumption increased by 11.432g. However, since the reheated steam after heat exchange in the high-temperature steam heat exchanger is used for heating, the overall cycle efficiency of the unit is increased by 2.88%, and the energy utilization efficiency is higher. The economic comparison of the unit before and after extracting the reheated steam once to heat the superheated steam is shown in Table 3 below.
[0051]
[0052] Embodiment 2: Extracting steam from the secondary high-temperature reheater outlet to heat superheated steam After the steam from the outlet of the secondary high-temperature reheater 5 is extracted to heat the steam from the inlet of the primary superheater 2, the steam temperature from the inlet of the superheater increases, the heat absorption of the superheater decreases, and the heat absorption of the reheater increases, so that the temperature of the reheated steam is also increased, which also affects the boiler efficiency, the heat rate of the steam turbine, and the coal consumption for power generation.
[0053] Taking 30% load as an example, the steam temperature at the secondary reheat outlet is 603℃ and the pressure is 1.044MPa. If 50t / h of this steam is extracted to heat the steam at the first superheater inlet, the steam temperature at the first superheater inlet is about 325℃, which can increase the temperature of the superheated steam. The reheated steam after heat exchange can be used to supply heat to the heat network.
[0054] The change of heat absorption of each heating surface and steam parameters after extracting steam from the secondary reheater outlet to heat superheated steam is solved by the verification calculation method. The change of inlet and outlet flue gas temperature and inlet and outlet steam parameters of the superheater before and after extracting steam from the secondary reheater to heat superheated steam is shown in Table 4.
[0055] Table 4 Changes in superheated steam parameters before and after extracting secondary reheat steam to heat superheated steam
[0056] It can be seen from the calculation results that after the superheater inlet steam temperature is increased, the main steam temperature also increases accordingly, and the main steam temperature increases by 13°C. In addition, due to the increase in the smoke temperature of the primary and secondary reheaters, the primary and secondary reheat steam temperatures will also increase. The changes in the primary and secondary reheat steam parameters before and after the secondary reheat steam is extracted to heat the superheated steam are shown in Table 5.
[0057] Table 5 Changes in primary and secondary reheat steam parameters before and after extracting secondary reheat steam to heat superheated steam
[0058] It can be seen that the temperature of the first reheat steam increased from 603℃ to 609℃, an increase of 6℃, while the temperature of the second reheat steam increased by 19℃ to 622℃.
[0059] After extracting the secondary reheat steam to heat the superheated steam, the amount of steam entering the medium and low pressure cylinders of the steam turbine to do work is small, which reduces the power generation of the steam turbine unit, and the power generation coal consumption and turbine heat rate increase slightly. The turbine heat rate increased by 3.78%, and the power generation coal consumption increased by 9.872g. However, since the reheated steam after heat exchange in the high-temperature steam heat exchanger is used for heating, the overall cycle efficiency of the unit is increased by 4.21%, and the energy utilization efficiency is higher. The economic comparison of the unit before and after extracting the primary reheat steam to heat the superheated steam is shown in Table 6 below.
[0060]
[0061] By comparing the economic performance of Examples 1 and 2, it can be seen that extracting steam from the outlet of the secondary high-temperature reheater to heat the steam at the inlet of the primary superheater is more economical, the turbine heat rate and power generation coal consumption are lower, and the cycle thermal efficiency is higher.
[0062] So far, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.
[0063] Although some specific embodiments of the present disclosure have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present disclosure. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict.
Claims
1. A boiler equipment, characterized in that: The invention comprises a furnace wall (1) which encloses a furnace chamber, a superheated steam pipeline partially arranged in the furnace wall (1), and a reheated steam pipeline arranged in the furnace wall (1); the superheated steam pipeline comprises a primary superheater (2) arranged in the furnace wall (1) and a steam heat exchanger (10) located upstream of the primary superheater (2); the reheated steam pipeline comprises a high-temperature reheater arranged in the furnace wall (1); the steam heat exchanger (10) comprises a first fluid pipeline connected to the primary superheater (2) and a second fluid pipeline bypassed to the high-temperature reheater via a bypass pipeline (12); a regulating valve (11) is arranged on the bypass pipeline (12) to adjust the flow rate.
2. The boiler equipment according to claim 1, characterized in that: The reheat steam pipeline comprises a primary reheat steam pipeline and a secondary reheat steam pipeline, the primary reheat steam pipeline comprises a primary high-temperature reheater (4) and a primary low-temperature reheater (7) connected in sequence, and the secondary reheat steam pipeline comprises a secondary high-temperature reheater (5) and a secondary low-temperature reheater (8) connected in sequence.
3. The boiler equipment according to claim 2, characterized in that: The second fluid pipeline is connected to the primary high-temperature reheater (4) via the bypass pipeline (12).
4. The boiler equipment according to claim 2, characterized in that: The second fluid pipeline is connected to the secondary high-temperature reheater (5) via the bypass pipeline (12).
5. The boiler equipment according to claim 2, characterized in that: The superheated steam pipeline further comprises a secondary superheater (6) and a tertiary superheater (3) arranged in the furnace wall (1), and the primary superheater (2), the secondary superheater (6) and the tertiary superheater (3) are connected in sequence.
6. The boiler equipment according to claim 5, characterized in that: The tertiary superheater (3) is located on the upper side of the primary superheater (2), and the secondary superheater (6) is located on the upper side of the tertiary superheater (3).
7. The boiler equipment according to claim 6, characterized in that: The primary high-temperature reheater (4) and the secondary high-temperature reheater (5) are arranged between the tertiary superheater (3) and the secondary superheater (6).
8. The boiler equipment according to claim 6, characterized in that: The primary low-temperature reheater (7) and the secondary low-temperature reheater (8) are arranged on the upper side of the secondary superheater (6).
9. The boiler equipment according to claim 1, characterized in that: It also includes a coal economizer (9) arranged on the upper part of the furnace wall (1).
10. A method for regulating the steam temperature of a boiler device, characterized in that: Use the boiler equipment described in any one of claims 1 to 9.