CN202032544U - Invert pulverized-coal fired boiler arrangement structure for ultrahigh steam temperature steam parameter - Google Patents

Abstract

An inverted pulverized coal boiler layout structure suitable for ultra-high steam temperature steam parameters, including a furnace with a burner on the upper part or/and top and a slagging outlet at the bottom outlet. The furnace is connected to the upward flue in the middle. The top of the ascending flue in the middle is connected horizontally with the top of the descending flue in the tail. A panel-type heating surface is provided under the inside of the furnace, and an economizer, a superheater tube group and a reheater are arranged in the ascending flue in the middle. The convection heating surface formed by the tube group, the tail descending flue is equipped with a denitrification system and an air preheater from top to bottom; by arranging the furnace outlet and the horizontal flue of the furnace outlet at the lower part of the boiler, the furnace outlet The high-temperature flue gas is at a lower elevation, so that the high-temperature superheater and high-temperature reheater are arranged at a lower elevation, thereby reducing the resistance and heat dissipation loss along the pipeline, improving the efficiency of the generator set, and making the generator set adopt ultra-high steam Warm steam parameters, and/or the use of a double reheat system becomes possible.

Description

Layout structure of inverted pulverized coal boiler suitable for ultra-high steam temperature steam parameters

technical field

The utility model relates to the field of boiler equipment, in particular to an arrangement structure of an inverted pulverized coal boiler suitable for ultra-high steam temperature steam parameters. the

Background technique

Pulverized coal boiler generator set, as the core technology of thermal power generation, has experienced more than 100 years of development. From subcritical to supercritical, and then to ultra-supercritical, my country's coal-fired thermal power technology has developed rapidly in recent years. Vigorously developing ultra-supercritical coal-fired thermal power technology and improving unit efficiency are the most economical and effective ways to achieve energy conservation, emission reduction, and carbon dioxide emission reduction. the

At present, the power generation efficiency of subcritical thermal power units with primary reheating is about 37%, and that of supercritical thermal power units with primary reheating is about 41%. The power generation efficiency can reach about 44%. If the steam parameters are further improved, the power generation efficiency of the unit is expected to be further improved. When the temperature of the main steam and reheat steam reaches the ultra-high steam temperature steam parameters of 700°C and above, the power generation efficiency of the primary reheat thermal power unit is expected to reach more than 48.5%. The power generation efficiency of thermal power units with double reheating is expected to reach more than 51%. Therefore, both at home and abroad are actively developing advanced ultra-supercritical thermal power generation unit technology with ultra-high steam temperature steam parameters whose steam temperature reaches or even exceeds 700 °C. the

The development of thermal power generation units with ultra-high steam temperature steam parameters, that is, thermal power generation units with main steam and reheat steam temperatures reaching 700°C and above, faces many major technical problems. Among them, there are two main technical difficulties, one is to develop superalloy materials that can meet the application requirements of ultra-supercritical thermal power generation units with ultra-high steam temperature steam parameters, and the other is to realize the design optimization of such unit systems and reduce the cost. the

Researches at home and abroad have shown that the superalloy materials that are most likely to be used for high-temperature components of ultra-high steam temperature ultra-supercritical thermal power generation units are mainly nickel-based alloys. However, the price of these nickel-based alloy materials is very high, which is more than 10 times that of the current conventional 600°C grade iron-based heat-resistant alloy steel. According to the current system layout of conventional thermal power units, if nickel-based alloy materials are used, taking a 2×1000MW ultra-supercritical unit as an example, only the high-temperature "four major pipelines" connecting the main steam and reheat steam to the steam turbine, the other The price will increase from the current about 300 million yuan to about 2.5 billion yuan. In addition, the use of heat-resistant alloys for high-temperature parts of boilers and steam turbines leads to an increase in their cost, which ultimately makes the overall cost of 700°C class ultra-supercritical units much higher than conventional 600°C class thermal power units, limiting the application and promotion of ultra-high steam parameter thermal power units . the

In addition, thermal power units with conventional main steam and reheat steam temperatures of 600°C or below can use either primary steam reheating or secondary reheating of steam, and the use of secondary reheating can greatly improve unit efficiency. However, at present, all large thermal power units in my country use the primary reheat system, and only a small number of large thermal power units abroad use the secondary reheat system. This is because the complexity of the unit system increases compared with the primary reheat system after the secondary reheat is adopted, and the investment also increases greatly, thus limiting the application of the secondary reheat system. If the complexity and cost of using the double reheat system can be reduced by optimizing the design of the unit system, the practical feasibility of using the double reheat system for large thermal power units will be greatly improved. the

Therefore, how to optimize the design of the unit system and reduce the consumption of high-temperature materials plays an important role in the application and promotion of ultra-high steam temperature ultra-supercritical units, promote the application of steam secondary reheating systems in large thermal power units, and improve the power generation efficiency of units. Crucial role. the

Patent No. 200720069418.3 "A New Type of Turbogenerator Set" discloses a method for reducing the length and cost of the high-temperature and high-pressure steam pipelines of the secondary reheating unit by arranging the high and low shafts of the turbogenerator set in random order. It is another way of thinking to solve this problem. However, since the high-mounted shaft system composed of high-pressure cylinders and generators needs to be arranged at a height of about 80 meters, it will cause serious vibration and other problems, and major technical problems such as support and foundation need to be solved. This arrangement method has not yet been applied. the

At present, the commonly used layout forms of pulverized coal boilers at home and abroad are mainly "π" shaped furnaces and tower furnaces, and a small amount of "T" shaped furnaces are used. Among them, the "π"-shaped furnace is currently the most commonly used boiler arrangement for large and medium-sized thermal power units in China. Its characteristic is that the boiler is composed of a furnace and a tail flue, and part of the heating surface is arranged in the horizontal flue and the tail flue shaft. The boiler is arranged in a "π" shape, and its furnace height is shorter than that of the tower furnace, which is beneficial to strong earthquake areas and windy areas, and the cost is also low. However, due to the severe flue gas vortex and disturbance, the uniformity of the flue gas flow is poor, which easily leads to uneven heating of the heating surface, resulting in large temperature deviations; and when burning inferior fuel, the boiler wears more seriously. the

In the tower furnace, all heating surfaces are arranged above the furnace, and no heating surface is arranged in the vertical flue at the tail. Compared with the "π" type furnace, the floor space is small, and it is suitable for projects with tight land use in the factory area. Due to the upward flow of the flue gas in the tower boiler, the dust in the flue gas slows down or settles down under the action of gravity, so the wear on the heating surface is greatly reduced. And the uniformity of flue gas flow is good, and the temperature deviation of the heating surface and working fluid is small. In addition, the structure of the tower boiler is simple, the boiler expansion center and sealing design are easy to handle, and the layout is compact. Therefore, for ultra-supercritical units, tower furnaces have certain advantages. the

The "T" shaped furnace divides the tail flue into two convective shaft flues of exactly the same size, which are symmetrically arranged on both sides of the furnace to solve the problem of difficult arrangement of the heating surface at the tail of the "π" shaped furnace, and also to make the furnace outlet The height of the chimney is reduced, reducing the thermal deviation of the flue gas along the height, and the flue gas flow rate in the shaft can be reduced to reduce wear. However, the occupied area is larger than that of the "π" type layout, the soda pipeline connection system is complicated, the metal consumption is large, the cost is high, and the domestic application is less. the

Regardless of the layout of the boiler, the flue gas flows from bottom to top in the furnace, and due to the need for heat transfer, the high-temperature heating surface needs to be arranged in the area with high flue gas temperature, and the high-temperature flue gas area depends on the furnace type. , the elevation of the location is more than 50-80 meters, which results in a very long high-temperature steam connecting pipe from the outlet header of the high-temperature heating surface to the steam turbine, and the cost is relatively high, which limits the adoption of technologies such as secondary reheating. When the steam temperature increases to 700°C and the ultra-high steam temperature steam parameters, because the material price per unit weight of the high-temperature steam connection pipe increases significantly, how to reduce the length and cost of the high-temperature steam connection pipe becomes a key technology that needs to be solved question. the

Contents of the invention

In order to overcome the deficiencies in the prior art above, the purpose of this utility model is to provide an inverted pulverized coal boiler layout structure suitable for ultra-high steam temperature steam parameters, so that the high-temperature superheater and high-temperature reheater are arranged at a lower elevation , thereby reducing the resistance and heat loss along the pipeline, improving the efficiency of the generating set, making it possible for the generating set to adopt ultra-high steam temperature steam parameters, and/or adopt a secondary reheating system. the

In order to achieve the above object, the technical solution adopted in the utility model is:

An inverted pulverized coal boiler layout structure suitable for ultra-high steam temperature steam parameters, including a furnace 4 with a slag discharge port 1 at the bottom outlet, a furnace flue gas outlet 201 at the lower part of the side wall of the furnace 4, and a furnace flue gas outlet 201. The gas outlet 201 communicates with one end of the horizontal flue 12 at the furnace outlet, and the other end of the horizontal flue 12 at the furnace outlet communicates with the middle ascending flue 14, the top of the middle ascending flue 14 and the tail descending flue 22 The top is horizontally connected; the inner part of the furnace 4 is provided with a panel heating surface 2, and the middle upward flue 14 is provided with an economizer 13, a superheater tube group 8 and a reheater tube group 9. The convection heating surface, wherein the final stage superheater and the final stage reheater are respectively connected to the corresponding high-pressure cylinder 103 and medium-pressure cylinder group 107 in the steam turbine 25 through the high-temperature steam pipeline 20, and the tail descending flue 22 is automatically A denitrification system 21 and an air preheater 23 are arranged from top to bottom, and a tail flue gas outlet 24 is arranged below the side wall of the tail descending flue 22 . the

Above the furnace flue gas outlet 201 on the side wall of the furnace 4 is a refraction angle 202 . the

A wall burner 5 is arranged above the side wall of the furnace 4 . the

A top burner 6 is arranged on the top of the furnace 4 . the

The convection heating surface located in the middle upward flue 14 is arranged in series or in parallel. When the parallel arrangement is adopted, the economizer 13, the superheater tube group 8 and the reheater tube group 9 is divided into groups of more than two convection heating surfaces, a partition wall 18 is arranged between the convection heating surfaces, and a smoke baffle 15 is arranged behind the partition wall 18 . the

The surroundings of the furnace 4 are covered by water-cooled walls 3, and the water-cooled walls 3 are spiral coil water-cooled walls, internally threaded vertical tube water-cooled walls, ordinary vertical tube water-cooled walls, or spiral tube coil water-cooled walls, inner The threaded vertical tube water cooling wall and the ordinary vertical tube water cooling wall are combined in pairs, and the overall flow direction of the water cooling working fluid in the water cooling wall is from top to bottom or bottom to top. the

The panel heating surface 2 is a heating surface of superheated steam, a heating surface of reheated steam, a heating surface of evaporation or a combination of heating surface of superheated steam, heating surface of reheated steam and heating surface of evaporation. the

The middle ascending flue 14 is formed by wrapping the heating surface 7 of the wrapping wall. the

A slag discharge machine 19 is arranged below the slag discharge port 1 . the

The bottom of the middle ascending flue 14 is provided with a first ash discharge port 101 , and the bottom of the tail descending flue 22 is provided with a second ash discharge port 102 . the

The utility model has the following beneficial effects:

1. Since the burner is placed above the side wall of the furnace 4 or the top of the furnace 4, the panel heating surface 2 is arranged at the lower part of the furnace 4, and a furnace flue gas outlet 201 is opened at the lower part of the furnace 4, thereby realizing the furnace 4 The inversion of the furnace makes the high-temperature flue gas at the outlet of the furnace at a lower elevation, making it possible to arrange the high-temperature superheater and high-temperature reheater at a lower elevation, thereby reducing the cost of connecting the boiler and the steam turbine 25 in the steam piping system. The length of the high-temperature steam pipeline 20 reduces the manufacturing cost of the pulverized coal boiler with ultra-high steam temperature steam parameters, reduces the resistance and heat dissipation loss along the pipeline, improves the efficiency of the generator set, and makes the generator set use ultra-high steam temperature steam parameters are possible. the

2. Since the length of the expensive high-temperature steam pipeline 20 connecting the boiler and the steam turbine 25 in the high-temperature steam pipeline system is reduced, the layout of the high-temperature steam pipeline 20 is simplified, so it is convenient to adopt ultra-high steam temperature steam parameters and higher steam temperature The unit adopts steam secondary reheating system. the

3. The superheater tube group 8 and the reheater tube group 9 are mainly arranged in the upward flue. The dust in the flue gas slows down or settles downward under the action of gravity, so the wear on the convective heating surface is reduced. the

4. The denitrification system 21 and the air preheater 23 are arranged in the tail descending flue 22, thus effectively solving the problem that the denitrification system 21 is difficult to arrange in a "π" shaped furnace due to space constraints. the

Description of drawings

Fig. 1 is a schematic diagram of the arrangement structure of an inverted pulverized coal boiler suitable for ultra-high steam temperature steam parameters in Embodiment 1 of the present utility model, and the arrows inside represent the flue gas flow direction. the

Fig. 2 is a schematic diagram of the arrangement structure of an inverted pulverized coal boiler suitable for ultra-high steam temperature steam parameters in Example 2 of the present utility model, and the arrows inside represent the flue gas flow direction. the

Fig. 3 is a schematic diagram of the layout structure of an inverted pulverized coal boiler suitable for ultra-high steam temperature steam parameters in Embodiment 3 of the present utility model, and the internal arrows represent the flue gas flow direction. the

Fig. 4 is a schematic diagram of the layout structure of an inverted pulverized coal boiler suitable for ultra-high steam temperature steam parameters in Embodiment 4 of the present utility model, and the arrows inside represent the flue gas flow direction. the

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described in more detail. the

Example 1:

As shown in Figure 1, the layout structure of an inverted pulverized coal boiler suitable for ultra-high steam temperature steam parameters includes a furnace 4 with a slag discharge port 1 at the bottom outlet, and a furnace flue gas outlet is opened at the lower part of the side wall of the furnace 4 201, the furnace flue gas outlet 201 is connected to one end of the horizontal flue 12 at the furnace outlet, and the other end of the horizontal flue 12 at the furnace outlet is connected to the middle upward flue 14, and the top and tail of the middle upward flue 14 go downward The top of the flue 22 is connected horizontally; the inside of the furnace 4 is provided with a panel heating surface 2, and the middle upward flue 14 is provided with an economizer 13, a superheater tube group 8 and a reheater tube The convective heating surface formed by group 9, the final superheater and the final reheater in the superheater and reheater are respectively connected to the corresponding high-pressure cylinder 103 and medium-pressure cylinder group 107 in the steam turbine 25 through the high-temperature steam pipeline 20 A denitrification system 21 and an air preheater 23 are arranged in the tail descending flue 22 from top to bottom, and a tail flue gas outlet 24 is arranged below the side wall of the tail descending flue 22 . Above the furnace flue gas outlet 201 on the side wall of the furnace 4 is a refraction angle 202 . A wall burner 5 is arranged above the side wall of the furnace 4 . A top burner 6 is arranged on the top of the furnace 4 . The convective heating surface located in the middle upward flue 14 is arranged in parallel, and the economizer 13, the superheater tube group 8 and the reheater tube group 9 on the convective heating surface are divided into three convective heating surface groups, and the convective heating surface A partition wall 18 is arranged between the surface and the convective heating surface, and a smoke baffle 15 is arranged behind the partition wall 18 . The surroundings of the furnace 4 are covered by water-cooled walls 3, and the water-cooled walls 3 are spiral coil water-cooled walls, internally threaded vertical tube water-cooled walls, ordinary vertical tube water-cooled walls, or spiral tube coil water-cooled walls, inner The threaded vertical tube water cooling wall and the ordinary vertical tube water cooling wall are combined in pairs, and the overall flow direction of the water cooling working fluid in the water cooling wall is from top to bottom or bottom to top. The panel heating surface 2 is a heating surface of superheated steam, a heating surface of reheated steam, a heating surface of evaporation or a combination of heating surface of superheated steam, heating surface of reheated steam and heating surface of evaporation. The middle ascending flue 14 is formed by wrapping the heating surface 7 of the wrapping wall. A slag discharge machine 19 is arranged below the slag discharge port 1 . The bottom of the middle ascending flue 14 is provided with a first ash discharge port 101 , and the bottom of the tail descending flue 22 is provided with a second ash discharge port 102 . the

Example 2:

As shown in Figure 2, the layout structure of an inverted pulverized coal boiler suitable for ultra-high steam temperature steam parameters includes a furnace 4 with a slag discharge port 1 at the bottom outlet, and the lower part of the side wall of the furnace 4 is provided with furnace flue gas Exit 201, the furnace flue gas outlet 201 is connected with one end of the furnace exit horizontal flue 12, the other end of the furnace exit horizontal flue 12 is connected with the middle upward flue 14, and the top and tail of the middle upward flue 14 The top of the down-going flue 22 is connected horizontally; the inside of the furnace 4 is provided with a panel-type heating surface 2 , and the middle part of the up-going flue 14 is provided with an economizer 13 , a superheater tube group 8 and a reheater The convective heating surface formed by the tube group 9, wherein the final stage superheater and the final stage reheater are respectively connected to the corresponding high-pressure cylinder 103 and medium-pressure cylinder group 107 in the steam turbine 25 through the high-temperature steam pipeline 20, and the tail part goes down A denitrification system 21 and an air preheater 23 are arranged in the flue 22 from top to bottom, and a tail flue gas outlet 24 is arranged below the side wall of the tail descending flue 22 . Above the furnace flue gas outlet 201 on the side wall of the furnace 4 is a refraction angle 202 . A wall burner 5 is arranged above the side wall of the furnace 4 . The convective heating surfaces located in the middle ascending flue 14 are arranged in series. The surroundings of the furnace 4 are covered by water-cooled walls 3, and the water-cooled walls 3 are spiral coil water-cooled walls, internally threaded vertical tube water-cooled walls, ordinary vertical tube water-cooled walls, or spiral tube coil water-cooled walls, inner The threaded vertical tube water cooling wall and the ordinary vertical tube water cooling wall are combined in pairs, and the overall flow direction of the water cooling working fluid in the water cooling wall is from top to bottom or bottom to top. The panel heating surface 2 is a heating surface of superheated steam, a heating surface of reheated steam, a heating surface of evaporation or a combination of heating surface of superheated steam, heating surface of reheated steam and heating surface of evaporation. The middle ascending flue 14 is formed by wrapping the heating surface 7 of the wrapping wall. A slag discharge machine 19 is arranged below the slag discharge port 1 . The bottom of the middle ascending flue 14 is provided with a first ash discharge port 101 , and the bottom of the tail descending flue 22 is provided with a second ash discharge port 102 . the

Example 3:

As shown in Figure 3, the layout structure of an inverted pulverized coal boiler suitable for ultra-high steam temperature steam parameters includes a furnace 4 with a slag discharge port 1 at the bottom outlet, and a furnace flue gas outlet is opened at the lower part of the side wall of the furnace 4 201, the furnace flue gas outlet 201 is connected to one end of the horizontal flue 12 at the furnace outlet, and the other end of the horizontal flue 12 at the furnace outlet is connected to the middle upward flue 14, and the top and tail of the middle upward flue 14 go downward The top of the flue 22 is connected horizontally; the inner part of the furnace 4 is provided with a panel heating surface 2, and the middle upward flue 14 is provided with an economizer 13, a superheater tube group 8 and a reheater tube The convective heating surface formed by group 9, wherein the final stage superheater and final stage reheater are connected to the corresponding high-pressure cylinder 103 and medium-pressure cylinder group 107 in the steam turbine 25 through the high-temperature steam pipeline 20 respectively, and the tail descending smoke A denitrification system 21 and an air preheater 23 are arranged in the channel 22 from top to bottom, and a tail flue gas outlet 24 is provided under the side wall of the tail descending flue 22 . Above the furnace flue gas outlet 201 on the side wall of the furnace 4 is a refraction angle 202 . A wall burner 5 is arranged above the side wall of the furnace 4 . The convective heating surface located in the middle upward flue 14 is arranged in parallel, and the economizer 13, superheater tube group 8 and reheater tube group 9 on the convective heating surface are divided into two convective heating surface groups A partition wall 18 is arranged between the convection heating surface and the convection heating surface, and a smoke baffle 15 is arranged behind the partition wall 18 . The surroundings of the furnace 4 are covered by water-cooled walls 3, and the water-cooled walls 3 are spiral coil water-cooled walls, internally threaded vertical tube water-cooled walls, ordinary vertical tube water-cooled walls, or spiral tube coil water-cooled walls, inner The threaded vertical tube water cooling wall and the ordinary vertical tube water cooling wall are combined in pairs, and the overall flow direction of the water cooling working fluid in the water cooling wall is from top to bottom or bottom to top. The panel heating surface 2 is a superheated steam heating surface, a reheating steam heating surface, an evaporation heating surface or a combination of the superheated steam heating surface, the reheating steam heating surface and the evaporation heating surface. The middle ascending flue 14 is formed by wrapping the heating surface 7 of the wrapping wall. A slag discharge machine 19 is arranged below the slag discharge port 1 . The bottom of the middle ascending flue 14 is provided with a first ash discharge port 101 , and the bottom of the tail descending flue 22 is provided with a second ash discharge port 102 . the

Example 4:

As shown in Figure 4, the layout structure of an inverted pulverized coal boiler suitable for ultra-high steam temperature steam parameters includes a furnace 4 with a slag discharge port 1 at the bottom outlet, and a furnace flue gas outlet is opened at the lower part of the side wall of the furnace 4 201, the furnace flue gas outlet 201 is connected to one end of the horizontal flue 12 at the furnace outlet, and the other end of the horizontal flue 12 at the furnace outlet is connected to the middle upward flue 14, and the top and tail of the middle upward flue 14 go downward The top of the flue 22 is connected horizontally; the inner part of the furnace 4 is provided with a panel heating surface 2, and the middle upward flue 14 is provided with an economizer 13, a superheater tube group 8 and a reheater tube The convective heating surface formed by group 9, wherein the final stage superheater and final stage reheater are connected to the corresponding high-pressure cylinder 103 and medium-pressure cylinder group 107 in the steam turbine 25 through the high-temperature steam pipeline 20 respectively, and the tail descending smoke A denitrification system 21 and an air preheater 23 are arranged in the channel 22 from top to bottom, and a tail flue gas outlet 24 is provided under the side wall of the tail descending flue 22 . A wall burner 5 is arranged above the side wall of the furnace 4 . A top burner 6 is arranged on the top of the furnace 4 . The convective heating surfaces located in the middle ascending flue 14 are arranged in series. The surroundings of the furnace 4 are covered by water-cooled walls 3, and the water-cooled walls 3 are spiral coil water-cooled walls, internally threaded vertical tube water-cooled walls, ordinary vertical tube water-cooled walls, or spiral tube coil water-cooled walls, inner The threaded vertical tube water cooling wall and the ordinary vertical tube water cooling wall are combined in pairs, and the overall flow direction of the water cooling working medium in the water cooling wall is from top to bottom or bottom to top. The panel heating surface 2 is a heating surface of superheated steam, a heating surface of reheated steam, a heating surface of evaporation or a combination of heating surface of superheated steam, heating surface of reheated steam and heating surface of evaporation. The middle ascending flue 14 is formed by wrapping the heating surface 7 of the wrapping wall. A slag discharge machine 19 is arranged below the slag discharge port 1 . The bottom of the middle ascending flue 14 is provided with a first ash discharge port 101 , and the bottom of the tail descending flue 22 is provided with a second ash discharge port 102 . the

The working principle of the utility model is: the flue gas flows from top to bottom inside the furnace 4, and then enters the middle ascending flue 14 through the furnace exit horizontal flue 12, and then the flue gas passes through the convective heating surface in the middle ascending flue 14, From the top of the ascending flue 14 in the middle, it enters the descending flue 22 at the tail, and finally the flue gas passes through the denitrification system 21 and the air preheater 23 in sequence, and then flows out from the flue gas outlet 24 at the tail. the

Claims (10)

1. inversion pulverized-coal fired boiler arrangement that is applicable to superelevation steam temperature steam parameter, comprise that outlet at bottom is provided with the burner hearth of slag-drip opening (1) (4), it is characterized in that: the lower sidewall of described burner hearth (4) has burner hearth exhanst gas outlet (201), burner hearth exhanst gas outlet (201) is conducted with an end of furnace outlet horizontal flue (12), the other end of furnace outlet horizontal flue (12) is conducted with middle part updraught flue (14), the top, horizontal conducting of the top of this middle part updraught flue (14) and afterbody down pass (22); The inner below of described burner hearth (4) is provided with curtain wall (2), be provided with economizer (13) in the described middle part updraught flue (14), the convection heating surface that superheater tube group (8) and reheater tube group (9) form, wherein finishing superheater and final reheater are conducted by high temperature steam pipeline (20) and steam turbine (25) middle corresponding high pressure cylinder (103) and intermediate pressure cylinder group (107) respectively, be provided with denitrating system (21) and air preheater (23) in the described afterbody down pass (22) from top to bottom, the sidewall below of described in addition afterbody down pass (22) is provided with tail flue gas outlet (24).

2. the inversion pulverized-coal fired boiler arrangement that is applicable to superelevation steam temperature steam parameter according to claim 1 is characterized in that: burner hearth exhanst gas outlet (201) top of described burner hearth 4 sidewalls is furnace arch, furnace nose (202).

3. according to claim 1 or the described inversion pulverized-coal fired boiler arrangement that is applicable to superelevation steam temperature steam parameter of claim 2, it is characterized in that: the sidewall top of described burner hearth (4) is provided with wall fired burners (5).

4. according to claim 1 or the described inversion pulverized-coal fired boiler arrangement that is applicable to superelevation steam temperature steam parameter of claim 2, it is characterized in that: the top of described burner hearth (4) is provided with top formula burner (6).

5. according to claim 1 or the described inversion pulverized-coal fired boiler arrangement that is applicable to superelevation steam temperature steam parameter of claim 2, it is characterized in that: the described convection heating surface that is arranged in middle part updraught flue (14), adopt series connection or arrangement form in parallel, when employing is arranged in parallel, economizer (13), superheater tube group (8) and the reheater tube group (9) of convection heating surface are divided into plural convection heating surface grouping, be provided with dividing wall (18) between convection heating surface and the convection heating surface, dividing wall (18) is provided with gas baffle (15) afterwards.

6. according to claim 1 or the described inversion pulverized-coal fired boiler arrangement that is applicable to superelevation steam temperature steam parameter of claim 2, it is characterized in that: form by water-cooling wall (3) coating around the described burner hearth (4), described water-cooling wall (3) is Spiral Coil Waterwall, internal thread vertical tube water-cooling wall, common vertical tube water-cooling wall or is Spiral Coil Waterwall, internal thread vertical tube water-cooling wall and common vertical tube water-cooling wall three's combination in twos, and the overall flow direction of water-cooled working medium in water-cooling wall is for flowing from top to bottom or flowing from top to bottom.

7. according to claim 1 or the described inversion pulverized-coal fired boiler arrangement that is applicable to superelevation steam temperature steam parameter of claim 2, it is characterized in that: described curtain wall (2) for the superheated steam heating surface, be reheated steam heating surface, evaporating heating surface or be superheated steam heating surface, reheated steam heating surface and evaporating heating surface three's combination.

8. according to claim 1 or the described inversion pulverized-coal fired boiler arrangement that is applicable to superelevation steam temperature steam parameter of claim 2, it is characterized in that: described middle part updraught flue (14) is coated by bag wall heating surface (7) and forms.

9. according to claim 1 or the described inversion pulverized-coal fired boiler arrangement that is applicable to superelevation steam temperature steam parameter of claim 2, it is characterized in that: the below of described slag-drip opening (1) is provided with slag extractor (19).

10. according to claim 1 or the described inversion pulverized-coal fired boiler arrangement that is applicable to superelevation steam temperature steam parameter of claim 2, it is characterized in that: the bottom of described middle part updraught flue (14) is provided with first ash discharging hole (101), and the bottom of described afterbody down pass (22) is provided with second ash discharging hole (102).

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