Ash bucket heat preservation device based on denitration system high-temperature clean flue gas

Abstract

The utility model relates to an ash bucket heat preservation device based on denitration system high-temperature clean flue gas, which comprises a heat preservation coil pipe (2) spirally wound on the outer wall of an ash bucket (1), a flow velocity partition is arranged in the heat preservation coil pipe (2), an air inlet (11) of the heat preservation coil pipe (2) is connected with a denitration clean flue gas pipe (4) through a flue gas inlet pipeline (3), the flue gas inlet pipeline (3) is connected with a flue gas extraction fan (5), and the flue gas extraction fan (5) is connected with an air outlet (6) of the heat preservation coil pipe (2). A gas outlet (12) of the heat preservation coil pipe (2) is connected with the desulfurization inlet flue (7) through a smoke exhaust pipeline (6), and a temperature sensor (8) is connected to the smoke exhaust pipeline (6) and connected with the smoke suction fan (5) through a controller. The device has the advantages that heat of high-temperature clean flue gas of a denitration system is fully utilized, the device is energy-saving and environment-friendly, heat exchange efficiency and heat exchange effect are effectively improved, and heat retaining property of the ash bucket is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas heat exchange, in particular to an ash hopper insulation device based on high-temperature clean flue gas of a desulfurization system. Background Art

[0002] Normally, the desulfurization and denitrification ash hopper is kept warm by steam, see Figure 1 , which is used to prevent the desulfurization ash from hardening in the ash hopper and avoid affecting the safe operation of the ash hopper. However, steam insulation consumes a lot of steam, which is not conducive to energy saving and environmental protection. At the same time, the outside of the ash hopper is wrapped with a coil, and steam is introduced into one end of the coil, and the steam after heat exchange is sent to the process water tank for reuse at the other end. In this process, the heat of the steam is gradually lost during the process because the steam exchanges heat while traveling in the coil, resulting in insufficient heat when the steam reaches the end of the coil. The ash hopper corresponding to this section will also be unable to fully exchange heat due to insufficient steam heat, affecting the heat exchange effect.

[0003] The net flue gas discharged from the destocking system has a high temperature and is corrosive. This part of the heat cannot be fully utilized, resulting in energy waste. Utility Model Content

[0004] The purpose of the utility model is to solve the problems of large amount of steam required for the insulation of the existing ash hopper, serious energy waste and poor heat exchange effect, and to provide an ash hopper insulation device based on the high-temperature clean flue gas of the de-gassing system, which can not only make full use of the heat of the high-temperature clean flue gas of the de-gassing system, save energy and be environmentally friendly, but also effectively improve the heat exchange efficiency and heat exchange effect, and ensure the thermal insulation of the ash hopper.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] An ash hopper insulation device based on high-temperature clean flue gas from a desulfurization system comprises an insulation coil spirally wound around the outer wall of the ash hopper, a flow rate zone is arranged inside the insulation coil, an air inlet of the insulation coil is connected to the desulfurization clean flue through a smoke inlet pipe, and a smoke extraction fan is connected to the smoke inlet pipe, an air outlet of the insulation coil is connected to the desulfurization inlet flue through a smoke exhaust pipe, and a temperature sensor is connected to the smoke exhaust pipe, and the temperature sensor is connected to the smoke extraction fan through a controller to adjust the fan opening in real time according to the temperature.

[0007] Furthermore, the insulation coil is a semicircular pipe, the inner side of which fits the outer wall of the ash hopper. The outer wall of the ash hopper is provided with a groove that matches the insulation coil. The inner side of the insulation coil is embedded in the corresponding groove. The outer side of the insulation coil is set as an arc section to increase the contact area between the coil and the ash hopper.

[0008] Furthermore, the air inlet of the insulation coil is set as an upper air inlet and a lower air inlet, the smoke inlet duct includes a main duct and two parallel branch ducts, each branch duct is connected to the corresponding air inlet, and the insulation coil is also set to two groups, which are a first coil and a second coil, respectively. The first coil is connected to the upper air inlet and is coiled from top to bottom, and the second coil is connected to the lower air inlet and is coiled from bottom to top. The ends of the first coil and the second coil converge at the same air outlet.

[0009] Furthermore, the first coil includes a front section coil and a rear section coil, the front section coil is close to the air inlet, and the rear section coil is close to the air outlet. An arc-shaped guide plate is provided in the inner cavity of the front section coil, one side of the guide plate is connected to the arc section of the insulation coil, and the other side is connected to the middle part of the inner side of the insulation coil. The guide plate divides the inner cavity of the front section coil into a high flow rate area and a low flow rate area. The inner cavity space occupied by the high flow rate area is smaller than the inner cavity space occupied by the low flow rate area, so as to circulate the smoke input into the front section coil in zones.

[0010] Furthermore, the configuration of the second coil is the same as that of the first coil.

[0011] Furthermore, the insulation coil is a pipe made of corrosion-resistant material, the flue gas temperature in the clean flue gas pipe reaches 260°C, and the ash hopper insulation temperature is controlled at 80~120°C.

[0012] Compared with the prior art, the advantages of the technical solution of the utility model are specifically:

[0013] (1) The utility model uses an extraction fan to lead the high-temperature clean flue gas of the denitrification system to the desulfurization ash hopper layer, which is connected to the insulation coil on the outer wall of the ash hopper. The flue gas after heat exchange is led to the desulfurization inlet flue, and the flue gas temperature is used to achieve the effect of ash hopper insulation, which is energy-saving and environmentally friendly and avoids energy waste;

[0014] (2) The smoke extraction fan of the utility model is connected to the remote transmission function and is equipped with a temperature sensor to adjust the fan opening in time to achieve the best insulation state and improve the insulation effect of the ash hopper;

[0015] (3) The utility model replaces the original single-inlet and single-outlet mode with a multi-inlet and single-outlet mode, and divides the insulation coil into several sections for separate air intake, shortening the path of a single flue gas, reducing the heat loss of the flue gas, ensuring that the heat of the flue gas reaching the second half is still sufficient, and improving the uniformity of the ash hopper insulation;

[0016] (4) The insulation coil of the utility model adopts a segmented structure and a flow rate zone setting, which ensures that a part of the high-temperature flue gas passes through the low-flow rate area normally to exchange heat with the ash hopper for insulation, and another small part of the high-temperature flue gas quickly passes through the high-flow rate area to reach the rear half of the coil in advance to exchange heat with the ash hopper for insulation, further reducing energy loss and improving heat exchange efficiency and effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a steam insulation ash hopper in the prior art;

[0018] Figure 2 It is a schematic diagram of the structure of the ash hopper insulation device based on the high-temperature clean flue gas of the desulfurization system of the utility model;

[0019] Figure 3 It is a schematic diagram of the partitions of the thermal insulation coil of the utility model;

[0020] Figure 4 for Figure 3 A is an enlarged view of the internal structure. DETAILED DESCRIPTION Example

[0021] In order to make the utility model more clear, the ash hopper insulation device based on high-temperature clean flue gas of the desulfurization system of the utility model is further explained below in conjunction with the accompanying drawings. The specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0022] See also Figure 2 , an ash hopper insulation device based on high-temperature clean flue gas of a desulfurization system, comprising an insulation coil 2 spirally wound around the outer wall of an ash hopper 1, characterized in that:

[0023] See also Figure 2 and Figure 3 The heat preservation coil 2 has two air inlets 11, namely an upper air inlet 11a and a lower air inlet 11b. The smoke inlet duct 3 includes a main duct 31 and two parallel branch ducts 32. Each branch duct 32 is connected to the corresponding air inlet 11. The main duct 31 is connected to the smoke removal pipe 4, and the smoke inlet duct 3 is connected to a smoke extraction fan 5.

[0024] The heat preservation coil 2 is also provided with two groups, which are respectively a first coil 21 and a second coil 22. The first coil 21 is connected to the upper air inlet 11a and is wound from top to bottom, and the second coil 22 is connected to the lower air inlet 11b and is wound from bottom to top. The ends of the first coil 21 and the second coil 22 converge at the same air outlet 12. The air outlet 12 of the heat preservation coil 2 is connected to the desulfurization inlet flue 7 through the exhaust pipe 6, and the exhaust pipe 6 is connected to a temperature sensor 8. The temperature sensor 8 is connected to the flue gas extraction fan 5 through a controller to adjust the fan opening in real time according to the temperature.

[0025] See also Figure 3 and Figure 4The insulation coil 2 is a semicircular pipe, the inner side of which fits the outer wall of the ash hopper 1. The outer wall of the ash hopper 1 is provided with a groove 1a that matches the insulation coil 2. The inner side of the insulation coil 2 is embedded in the corresponding groove 1a. The outer side of the insulation coil 2 is set as an arc segment to increase the contact area between the coil and the ash hopper.

[0026] The first coil 21 includes a front coil 211 and a rear coil 212. The front coil 211 is close to the air inlet 11, and the rear coil 212 is close to the air outlet 12. An arc-shaped guide plate 9 is provided in the inner cavity of the front coil 211. One side of the guide plate 9 is connected to the arc section of the insulation coil 2, and the other side is connected to the middle part of the inner side of the insulation coil 2. The guide plate 9 divides the inner cavity of the front coil 212 into a high flow rate area 9a and a low flow rate area 9b. The inner cavity space occupied by the high flow rate area 9a is smaller than the inner cavity space occupied by the low flow rate area 9b, so as to divide the smoke input into the front coil into zones for circulation.

[0027] In this embodiment, the insulation coil 2 is a pipe made of corrosion-resistant material, the flue gas temperature in the flue gas pipe reaches 260°C, and the ash hopper insulation temperature is controlled at 80-120°C.

[0028] In this embodiment, a fan with appropriate wind pressure can be selected according to the negative pressure of the denitrification flue; at the same time, the insulation pipes must be corrosion-resistant; in addition, the flue gas after pressure heat exchange is led to the desulfurization inlet flue to avoid unorganized emissions caused by flue gas discharge.

[0029] When in use, the high-temperature flue gas is respectively introduced into the first coil 21 and the second coil 22 by two branch pipes 32. When passing through the front coil 211 of the first coil 21 and the second coil 22, the high-temperature flue gas is divided into two paths. One path of flue gas passes through the small flow velocity area 9b with a larger area, and the other path of flue gas passes through the large flow velocity area 9a with a smaller area. Since the area of ​​the large flow velocity area 9a is small, the flue gas flow rate therein is small but the flow velocity is fast, and it carries sufficient heat to enter the rear coil 212 in advance, and heat exchange and insulation are carried out with the ash hopper position in the rear half. Since the small flow velocity area 9b has a large area, the flue gas with a large flow rate and relatively slow flow velocity can pass through the coil normally for heat exchange and insulation with the ash hopper, thereby avoiding the phenomenon that the flue gas heat is slowly lost as the path is longer, thereby improving the insulation effect.

[0030] The utility model is mainly composed of an insulation pipe, a flue gas extraction fan and a temperature sensor. The extraction fan is used to lead the 260°C high-temperature clean flue gas of the denitrification system to the desulfurization ash hopper layer, connected to the ash hopper outer wall insulation coil, and the flue gas after heat exchange is led to the desulfurization inlet flue, and the flue gas temperature is used to achieve the ash hopper insulation effect, and the temperature sensor is installed to adjust the fan opening in time to achieve the best insulation state of 80~120°C, which is energy-saving and environmentally friendly, and improves the insulation effect of the ash hopper.

[0031] In addition to the above embodiments, the present invention may also have other implementations. Any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope required by the present invention.

Claims

1. An ash hopper insulation device based on high-temperature clean flue gas from a desulfurization system, comprising an insulation coil (2) spirally wound around the outer wall of an ash hopper (1), characterized in that: The heat preservation coil (2) is provided with a flow rate zone. The air inlet (11) of the heat preservation coil (2) is connected to the desulfurization clean flue gas pipe (4) through the smoke inlet pipe (3), and the smoke inlet pipe (3) is connected to a smoke extraction fan (5). The air outlet (12) of the heat preservation coil (2) is connected to the desulfurization inlet flue (7) through the smoke exhaust pipe (6), and the smoke exhaust pipe (6) is connected to a temperature sensor (8), and the temperature sensor (8) is connected to the smoke extraction fan (5) through a controller.

2. The ash hopper insulation device based on high-temperature clean flue gas from a destocking system according to claim 1 is characterized in that: The insulation coil (2) is a semicircular pipe, the inner side of which fits the outer wall of the ash hopper (1). The outer wall of the ash hopper (1) is provided with a groove (1a) matching the insulation coil (2). The inner side of the insulation coil (2) is embedded in the corresponding groove (1a), and the outer side of the insulation coil (2) is set as a circular arc segment.

3. The ash hopper insulation device based on high-temperature clean flue gas from a destocking system according to claim 1 or 2, characterized in that: The air inlet (11) of the heat-insulating coil (2) is configured as an upper air inlet (11a) and a lower air inlet (11b); the smoke inlet duct (3) comprises a main duct (31) and two parallel branch ducts (32); each branch duct (32) is respectively connected to a corresponding air inlet (11); the heat-insulating coil (2) is also configured as two groups, namely a first coil (21) and a second coil (22); the first coil (21) is connected to the upper air inlet (11a) and is wound from top to bottom; the second coil (22) is connected to the lower air inlet (11b) and is wound from bottom to top; the ends of the first coil (21) and the second coil (22) converge at the same air outlet (12).

4. The ash hopper insulation device based on high-temperature clean flue gas from a destocking system according to claim 3 is characterized in that: The first coil (21) comprises a front coil (211) and a rear coil (212), the front coil (211) being close to the air inlet (11) and the rear coil (212) being close to the air outlet (12), an arc-shaped guide plate (9) being provided in the inner cavity of the front coil (211), one side of the guide plate (9) being connected to the arc section of the heat-insulating coil (2) and the other side being connected to the middle part of the inner side of the heat-insulating coil (2), the guide plate (9) dividing the inner cavity of the front coil (211) into a high flow velocity zone (9a) and a low flow velocity zone (9b), the inner cavity space occupied by the high flow velocity zone (9a) being smaller than the inner cavity space occupied by the low flow velocity zone (9b).

5. The ash hopper insulation device based on high-temperature clean flue gas from a destocking system according to claim 4 is characterized in that: The configuration of the second coil (22) is the same as that of the first coil (21).

6. The ash hopper insulation device based on high-temperature clean flue gas from a destocking system according to claim 1 or 2, characterized in that: The heat-insulating coil (2) is a pipe made of corrosion-resistant material. The flue gas temperature in the flue gas pipe (4) reaches 260° C., and the heat-insulating temperature of the ash hopper (1) is controlled at 80-120° C.

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