Direct heat exchanger of high-temperature particle steel slag packed bed

Abstract

The utility model discloses a direct heat exchanger of a high-temperature particle steel slag packed bed, which is used for solving the problem of how to generate high-temperature supersaturated steam by utilizing heat energy contained in high-temperature steel slag. A main heat exchange channel and an auxiliary heat exchange channel are arranged in a shell of the heat exchanger, an inner cavity of the main heat exchange channel and an inner cavity of the auxiliary heat exchange channel are independent of each other, a roller screen is installed at a feeding port of the main heat exchange channel, and after high-temperature steel slag is screened through the roller screen, small-particle steel slag falls into the main heat exchange channel, and large-particle steel slag falls into the auxiliary heat exchange channel. And inner cavities of the main heat exchange channel and the auxiliary heat exchange channel are subjected to sectional heat exchange by a first-stage heat exchange wall pipe unit, a second-stage heat exchange wall pipe unit and a third-stage heat exchange wall pipe unit which are arranged from bottom to top. According to the technology, the heat exchange wall units in the tower body are optimally designed into the low-temperature section, the medium-temperature section and the high-temperature section from bottom to top, high-temperature steel slag is cooled in order, and high-quality supersaturated steam can be generated.

Description

Technical Field

[0001] This utility model relates to the field of special equipment technology for the preheating and recovery of high-temperature steel slag. Background Technology

[0002] CN215628050U discloses a semi-enclosed high-temperature steel slag waste heat recovery device, including a steel slag bin, guide rails, a gantry frame, a gate, and a water-cooled roller structure. The steel slag bin is used to contain high-temperature steel slag. The guide rails are arranged on both sides of the steel slag bin. The bottom of the gantry frame is movably installed above the guide rails. The gate is located on one side of the steel slag bin and serves as an inlet for feeding high-temperature steel slag. The two ends of the water-cooled roller structure are connected to the inner wall of the gantry frame and the top of the steel slag bin. This structure is designed with a horizontal steel slag flow path, which causes problems such as easy slag blockage and only one-stage heat exchange. The hot water produced by the heat exchange is of relatively low quality and cannot generate supersaturated steam for production.

[0003] Based on a vertical heat exchange tower design, this utility model proposes a dry heat exchange technology to recover and utilize the heat energy in high-temperature steel slag in stages, and finally obtain supersaturated steam that can be directly used for industrial production, which is a high-quality steam. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a high-temperature granular steel slag packed bed direct heat exchanger, which solves the problem of how to utilize the heat energy contained in high-temperature steel slag to generate high-temperature supersaturated steam and improve heat exchange efficiency during the heat exchange process.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows:

[0006] A high-temperature granular steel slag packed bed direct heat exchanger has a main heat exchange channel and a secondary heat exchange channel inside its outer shell. The inner cavities of the main heat exchange channel and the secondary heat exchange channel are independent of each other. A roller screen is installed at the feed inlet of the main heat exchange channel. After the high-temperature steel slag is screened by the roller screen, small particles of steel slag fall into the main heat exchange channel, and large particles of steel slag fall into the secondary heat exchange channel. The inner cavities of the main heat exchange channel and the secondary heat exchange channel are divided into three stages of heat exchange by a primary heat exchange wall tube unit, a secondary heat exchange wall tube unit, and a tertiary heat exchange wall tube unit arranged from bottom to top. The water inlet of the primary heat exchange wall unit is connected to a deaerator through a water pump. The deaerator is connected to a makeup water port. The water outlet of the primary heat exchange wall unit is connected to the water inlet of the secondary heat exchange wall unit. The water outlet of the secondary heat exchange wall unit is connected to a steam drum through a pipeline. The steam port in the steam drum is connected to the tertiary heat exchange wall unit. The water outlet of the tertiary heat exchange wall unit is connected to the steam drum through a pipeline and generates steam.

[0007] Furthermore, the inner cavity of the main heat exchange channel is divided into cuboid spaces by heat exchange tubes, and the cuboid spaces in the two adjacent heat exchange wall units are arranged perpendicularly to each other, while the material channel in the secondary heat exchange channel is square.

[0008] Furthermore, the primary, secondary, and tertiary heat exchange wall units are three-dimensional heat exchange structures composed of top pipes, bottom pipes, and vertical pipes. The top pipes are return water pipes, the bottom pipes are inlet water pipes, and the vertical pipes connect the top and bottom pipes to form a bottom-up heat exchange path.

[0009] Furthermore, the discharge port is equipped with a gate and a vibrator to control the discharge speed of the steel slag material.

[0010] Furthermore, an infrared temperature detector is installed at the discharge port to monitor the temperature of the steel slag at the discharge port, and it is linked with the vibrator and gate.

[0011] Furthermore, a movable dust removal hood with horizontal movement is provided above the feed inlet.

[0012] Furthermore, the roller screen is installed at an angle, which facilitates the rapid screening and discharge of steel slag.

[0013] Furthermore, the outer shell of the tower is composed of refractory materials, heat insulation materials, and metal plates.

[0014] Furthermore, the outermost shell of the outer shell is a steel plate, and the inner side of the steel plate consists of refractory aluminum silicate refractory fiber felt, refractory heat-insulating bricks, and refractory bricks in sequence.

[0015] Furthermore, the refractory bricks are further divided into high-alumina refractory bricks and clay refractory bricks according to the different heights at which they are pasted. High-alumina refractory bricks are laid in the inner cavity of the middle and high parts of the tower body, while clay refractory bricks are laid in the inner cavity of the lower parts of the tower body.

[0016] The beneficial effects of this utility model are:

[0017] This technology optimizes the heat exchange wall units in the tower body, designing them from bottom to top as low, medium, and high temperature sections to cool high-temperature steel slag in an orderly manner and generate high-quality supersaturated steam.

[0018] This technology optimizes the layout of the heat exchange walls in the heat exchange wall unit, especially by designing the material channels in different heat exchange section units in a cross pattern. This allows the high-temperature steel slag material to effectively tumble during its descent, improving the contact between the high-temperature steel slag and the heat exchange vertical tubes, and thus increasing the heat exchange efficiency.

[0019] This technological innovation ensures heat exchange while maintaining a closed system, effectively preventing dust and heat loss. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the main elevation of the device.

[0021] Figure 2 This is a side elevation view of the device.

[0022] Figure 3 for Figure 1 Sectional view A-A.

[0023] Figure 4 for Figure 1 Sectional view B-B.

[0024] Figure 5 for Figure 1 C-C section view.

[0025] Figure 6 for Figure 1 Middle D--D sectional view.

[0026] Figure 7 This is a three-dimensional view of the heat exchange wall unit.

[0027] Figure 8 The diagram shown in Example 2 illustrates the process of filling the steel slag hopper.

[0028] Figure 9 This is a state diagram of Example 2, showing the dust removal status.

[0029] In the picture:

[0030] 100 outer casing, 110 feed inlet, 120 discharge outlet, 130 partition.

[0031] 200 Main heat exchange channel, 210 Primary heat exchanger wall tube unit, 211 Deaerator, 220 Secondary heat exchanger wall tube unit, 221 Steam drum, 230 Tertiary heat exchanger wall tube unit.

[0032] 300 heat exchange channels

[0033] 400 frame structure,

[0034] 500 roller screen

[0035] 600 mobile dust collector hood, 610 steel slag hopper

[0036] 001 Top pipe, 002 Bottom pipe, 003 Vertical pipe. Detailed Implementation

[0037] Example 1

[0038] This specific implementation method will be described in conjunction with the appendix to the instruction manual. Figure 1 To be continued Figure 7A more detailed explanation follows. This high-temperature granular steel slag packed bed direct heat exchanger is designed for crushed high-temperature steel slag. This high-temperature steel slag is a wide-screen-size bulk material with an initial temperature of 1000 degrees Celsius or higher. Through this device, three-stage heat exchange is performed, ultimately recovering the effective residual heat from the high-temperature steel slag. The discharge temperature of the high-temperature steel slag after heat exchange is no higher than 100°C. In other words, the application of this device achieves the purpose of reducing the temperature of the steel slag while generating supersaturated steam.

[0039] In this embodiment, the most common high-temperature steel slag particles are bulk high-temperature steel slag with a particle size distribution range of 20mm-30mm, and it also contains a certain number of large steel slag particles larger than 30mm. The roller screen 500 at the top of the device performs preliminary screening. After screening, the bulk materials of different particle sizes enter two heat exchange chambers with different drop space dimensions and different drop speeds. For the smaller particle size (1-30mm) of the high-temperature steel slag particles, the space enclosed by the heat exchange walls in the heat exchange chamber is rectangular with a small pipe spacing, for example, it can be set to 100mm. This method spatially divides the steel slag in the main heat exchange channel. For high-temperature steel slag particles with a particle size greater than 30mm, the pipe spacing can be set wider, allowing large pieces of high-temperature steel slag to exchange heat directly with the heat exchange walls. In this embodiment, it is designed as a square with a horizontal cross-section.

[0040] The heat exchanger includes an outer shell 100 and an internal heat exchange wall tube unit. The tower body of the outer shell 100 is composed of refractory material, insulation material and metal plate. Specifically, the outermost shell of the outer shell 100 is a steel plate, and the inner side of the steel plate is composed of refractory aluminosilicate fiber felt, refractory insulating brick and refractory brick in sequence. The refractory brick can be divided into high alumina refractory brick and clay refractory brick according to the different height of the bonding position. High alumina refractory brick is laid in the middle and high part of the inner cavity of the tower body, and clay refractory brick is laid in the lower part of the inner cavity of the tower body.

[0041] The feed inlet 110 is located at the highest point of the tower. This feed inlet is also the discharge end of the high-temperature steel slag, which falls into the heat exchange chamber from top to bottom.

[0042] The heat exchanger has two slag channels in its tower body. One channel, designated as the main heat exchange channel 200, is used for the accumulation and heat exchange of small-particle-size high-temperature steel slag. The other channel, designated as the secondary heat exchange channel 300, is used for the accumulation and heat exchange of large-particle-size high-temperature steel slag. The two heat exchange channels are separated by a vertical baffle 130 (in this embodiment, the baffle is composed of densely arranged vertical pipes 003, which have a physical isolation function) to form two independent material channels.

[0043] At the lowest point of the tower is the discharge port 120. The discharge port controls the discharge of steel slag material through a combination of gate and vibrator. The discharge speed controls the falling speed of steel slag in the two material channels.

[0044] Furthermore, an infrared temperature detector is installed at the discharge port 120 to monitor the temperature of the steel slag at the discharge port, and it is linked with the vibrator and gate to control the temperature of the steel slag after discharge to meet the set requirements.

[0045] Three sets of heat exchange wall tube units are installed in the inner cavity of the main heat exchange channel 200 and the secondary heat exchange channel 300. Each set of heat exchange wall tube units has different functions. For ease of description, the three sets of heat exchange wall tube units are labeled from bottom to top as primary heat exchange wall tube unit 210, secondary heat exchange wall tube unit 220, and tertiary heat exchange wall tube unit 230. The three sets of heat exchange wall units span the main heat exchange channel 200 and the secondary heat exchange channel 300 in the horizontal direction. The space in the main heat exchange channel and the secondary heat exchange channel is divided by the three sets of heat exchange wall units. The divided heat exchange channel allows the steel slag to be turned over and heat transferred in an orderly manner, which is conducive to improving the heat exchange efficiency. The inlet of the primary heat exchanger 210 is connected to the deaerator 211 via a water pump. The deaerator 211 is connected to the circulating water system, which has a makeup water port. The softened water after deaeration enters the primary heat exchange wall unit, where it exchanges heat with the steel slag in the low-temperature section. The low-temperature soft water exchanges heat in the primary heat exchange wall unit. The outlet of the primary heat exchange wall unit 210 is connected to the inlet of the secondary heat exchange wall unit. The outlet of the secondary heat exchange wall unit 220 is connected to the steam drum 221 via a pipeline. The steam port in the steam drum 221 is connected to the inlet of the tertiary heat exchange wall unit 230. The steam outlet of the tertiary heat exchange wall unit is connected to the steam drum again, forming a high-temperature section evaporation. Here, the steam-water mixture is reheated to generate high-pressure saturated steam. High-temperature saturated steam re-enters the steam drum 221 through the pipeline. After steam-water separation in the steam drum 221, clean steam is transported out through the steam pipeline of the steam drum and, with the help of the steam network system, the steam in the steam network system can be used for power generation, heating, etc., thereby producing high-quality supersaturated steam.

[0046] In this embodiment, a relatively easy-to-implement style is shown. The three heat exchange wall units share the same structural principle. For example, a heat exchange wall unit is a three-dimensional structure composed of a top pipe 001, a bottom pipe 002, and a vertical pipe 003. The top pipe is the return water pipe, the bottom pipe is the inlet water pipe, and the vertical pipe connects the top and bottom pipes, forming a bottom-up heat exchange path. In this embodiment, the vertical pipes are arranged densely side by side in the material channel of the steel slag. Figure 7 The heat exchange wall unit shown is a possible structural illustration and is not an absolute limitation on the structure. Any pipeline arrangement structure that can perform heat exchange should fall within the protection scope of this utility model.

[0047] In this embodiment, the vertical pipes 003 are densely arranged without gaps, which can prevent the steel slag from getting stuck.

[0048] Furthermore, in this embodiment, among the three heat exchange wall units, the material channel in the left heat exchange wall unit is rectangular, with a length greater than its width. The material channel in the secondary heat exchange wall unit is perpendicular to the material channel in the primary heat exchange wall unit, and similarly, the material channel in the secondary heat exchange wall unit is perpendicular to the material channel in the tertiary heat exchange wall unit. The material channel in the primary heat exchange wall unit is parallel to the material channel in the tertiary heat exchange wall unit. This design allows the steel slag material to have sufficient contact with the heat exchange wall during its descent.

[0049] The main heat exchange channel provides the high-temperature steel slag material obtained after screening, and it is piled up in the main channel with a pile height of not less than 80%. Large pieces of high-temperature steel slag enter the secondary channel, and the steel slag inside is slowly moved down under the control of the discharge port.

[0050] Furthermore, a steel frame structure 400 is installed around the tower body, on which the main and auxiliary components such as the tower body, steam drum, deaerator, water pump, and pipelines are installed.

[0051] Furthermore, a ladder and a fall arrest mechanism are installed on the aforementioned frame structure 400 for personnel to climb.

[0052] Example 2

[0053] refer to Figure 8 The difference between this embodiment and Embodiment 1 is that, based on Embodiment 1, the roller screen 500' installed at the feed inlet 110 is installed at an angle. That is, the roller screen has a certain angle of inclination. The advantage of this inclined installation is that after the granular steel slag is screened by the roller screen, it enters the main heat exchange channel, while the large granular steel slag falls into the secondary heat exchange channel in front. By utilizing the gravity of the steel slag itself, the accumulation of steel slag at the roller screen 500' can be effectively avoided.

[0054] Furthermore, a second difference in this embodiment is that a movable dust collector 600 is provided at the feed inlet above the roller screen. This movable dust collector 600 has a horizontal movement function, that is, it moves horizontally along a horizontal track. The function of this movable dust collector 600 is to seal the upper feed inlet port after the filling is completed. (Refer to...) Figure 9 To avoid dust generation, a 610 steel slag hopper is used for hoisting operations during the filling process, as per reference. Figure 8 At this point, the moving dust hood is moved horizontally to clear the feed inlet. After the filling is completed, the moving dust hood is returned to the feed inlet port to seal it.

[0055] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Without departing from the spirit of the present utility model, all modifications and improvements to the present utility model by those skilled in the art should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A high-temperature granular steel slag packed bed direct heat exchanger, wherein the outer shell of the heat exchanger has a main heat exchange channel and a secondary heat exchange channel, and the inner cavities of the main heat exchange channel and the secondary heat exchange channel exist independently of each other, characterized in that, A roller screen is installed at the feed inlet of the main heat exchange channel. After the high-temperature steel slag is screened by the roller screen, small steel slag particles fall into the main heat exchange channel, and large steel slag particles fall into the secondary heat exchange channel. The inner cavity of the main heat exchange channel and the secondary heat exchange channel is divided into three sections for heat exchange: a first-stage heat exchange wall tube unit, a second-stage heat exchange wall tube unit, and a third-stage heat exchange wall tube unit arranged from bottom to top. The water inlet of the first-stage heat exchange wall unit is connected to the deaerator through a water pump. The deaerator is connected to a makeup water port. The water outlet of the first-stage heat exchange wall unit is connected to the water inlet of the second-stage heat exchange wall unit. The water outlet of the second-stage heat exchange wall unit is connected to the steam drum through a pipeline. The steam port in the steam drum is connected to the third-stage heat exchange wall unit. The water outlet of the third-stage heat exchange wall unit is connected to the steam drum through a pipeline and generates steam.

2. The high-temperature granular steel slag packed bed direct heat exchanger according to claim 1, characterized in that, The inner cavity of the main heat exchange channel is divided into cuboid spaces by heat exchange tubes, and the cuboid spaces in the two adjacent heat exchange wall units are arranged perpendicularly to each other. The material channel in the secondary heat exchange channel is square.

3. The high-temperature granular steel slag packed bed direct heat exchanger according to claim 1, characterized in that, The primary, secondary, and tertiary heat exchange wall units are three-dimensional heat exchange structures composed of top pipes, bottom pipes, and vertical pipes. The top pipes are return water pipes, the bottom pipes are inlet water pipes, and the vertical pipes connect the top and bottom pipes to form a bottom-up heat exchange path.

4. The high-temperature granular steel slag packed bed direct heat exchanger according to claim 1, characterized in that, A movable dust collector with horizontal movement is installed above the feed inlet.

5. The high-temperature granular steel slag packed bed direct heat exchanger according to claim 1, characterized in that, The roller screen is installed at an angle.

6. The high-temperature granular steel slag packed bed direct heat exchanger according to claim 1, characterized in that, The outer shell of the tower is composed of refractory materials, heat insulation materials, and metal plates.

7. The high-temperature granular steel slag packed bed direct heat exchanger according to claim 6, characterized in that, The outermost shell of the outer shell is a steel plate, and the inner side of the steel plate consists of refractory aluminum silicate fiber felt, refractory insulating bricks, and refractory bricks in sequence.

8. The high-temperature granular steel slag packed bed direct heat exchanger according to claim 7, characterized in that, The refractory bricks are divided into high-alumina refractory bricks and clay refractory bricks according to the different heights at which they are pasted. High-alumina refractory bricks are laid in the inner cavity of the middle and high parts of the tower body, while clay refractory bricks are laid in the inner cavity of the lower parts of the tower body.

Images