Waste heat recovery type water-cooled horizontal pipe blanking system

Abstract

The utility model provides a waste heat recovery type water-cooled horizontal pipe blanking system which not only has a blanking function, but also can recover waste heat of an expansion furnace and supply combustion-supporting air for preheating of a preheating furnace and a combustor at the bottom of the expansion furnace, has multiple purposes, and saves energy. According to the technical scheme, the device comprises an elbow pipe connected with a material outlet in the top end of the expansion furnace, and the elbow pipe is provided with a material channel bent at a certain angle; the circulating cooling module comprises a water tank arranged outside the elbow pipe in a sleeving mode, the side wall and the bottom of the water tank are each provided with an installation connector matched with the two ends of the elbow pipe in a sealed mode, and the water tank communicates with a cooling water circulating system; the waste heat recovery assembly comprises a horizontally-arranged material guide pipe, one end of the material guide pipe is communicated with a discharging port of the elbow pipe, and the other end of the material guide pipe is communicated to a heating cavity of the preheating furnace; the material distributing device comprises a material falling hopper arranged at the bottom of the material guiding pipe, a material falling opening formed in the material falling hopper is formed in the bottom of the material guiding pipe, and the material falling hopper is communicated with the finished product bin.

Description

Technical Field

[0001] This utility model relates to the technical field of perlite expansion equipment, and in particular to a waste heat recovery type water-cooled horizontal pipe feeding system. Background Technology

[0002] A perlite expansion furnace is a specialized piece of equipment for producing expanded perlite. Vitrified microspheres are white granular materials with a honeycomb-like internal structure, produced by preheating and instantaneously high-temperature calcining perlite ore. The production process of expanded perlite is as follows: Perlite manufacturers select perlite raw material ore of different particle sizes according to different applications. The moisture content of the perlite raw material ore is generally 4-6%. Rapid evaporation of moisture can cause the perlite to crack. Therefore, the ineffective water content of the perlite raw material ore should be removed before expansion. Extensive testing by domestic and international laboratories and manufacturers has shown that the optimal expansion effect and the largest expansion ratio (i.e., the lowest loose density) are achieved when the effective water content of expanded perlite is between 2.2% and 2.4%. Therefore, the production process of expanded perlite includes two key steps: preheating and expansion.

[0003] However, the preheating furnaces currently used for expanded perlite typically employ electric heating or gas heating for preheating. For example, a Chinese patent for an expanded perlite preheating furnace, publication number CN206944710U, includes a horizontally arranged cylindrical furnace chamber, four support rollers located below the front and rear ends of the furnace chamber, a drive mechanism for rotating the furnace chamber, a refractory brick furnace shell located outside the furnace chamber, a gas inlet pipe, an air distribution pipe, and an air distribution fan. A furnace chamber is located between the refractory brick furnace shell and the furnace chamber. A heating port is located on the side wall of the refractory brick furnace shell directly below the furnace chamber. The end of the gas inlet pipe extends into the furnace chamber through the heating port. The air distribution fan is located at the inlet of the air distribution pipe, which is connected to the gas inlet pipe.

[0004] Therefore, it is evident that most existing technologies use an additional heating source to heat the perlite preheating furnace, neglecting the preheating generated by the expansion furnace itself, resulting in energy and economic waste. Furthermore, the bottom burner of the expansion furnace typically preheats the combustion air to increase combustion efficiency during combustion; using an external heating device to heat the combustion air also constitutes energy waste. While some existing technologies recover preheating from the expansion furnace to heat the combustion air in the burner, these are separate installations. Utility Model Content

[0005] To address the above technical problems, this utility model provides a waste heat recovery type water-cooled horizontal tube feeding system, which not only has the function of feeding materials, but also recovers the waste heat of the expansion furnace and supplies the combustion air preheating to the preheating furnace and the burner at the bottom of the expansion furnace. It is a multi-purpose machine that saves energy.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A waste heat recovery type water-cooled horizontal tube feeding system includes:

[0008] An elbow pipe is connected to the material outlet at the top of the expansion furnace, and the elbow pipe has a material channel that is bent at a certain angle.

[0009] The circulating cooling module includes a water tank fitted outside the elbow pipe. The side wall and bottom of the water tank are respectively provided with installation interfaces that seal with both ends of the elbow pipe, and the water tank is connected to a cooling water circulation system.

[0010] The waste heat recovery assembly includes a horizontally arranged feed pipe, one end of which is connected to the outlet of the elbow pipe, and the other end is connected to the heating chamber of the preheating furnace.

[0011] The material distribution device includes a hopper located at the bottom of a guide pipe, wherein the bottom of the guide pipe has a discharge port placed inside the hopper, and the hopper is connected to the finished product silo.

[0012] Furthermore, the waste heat recovery assembly also includes a combustion air preheating box fitted in the middle section of the feed pipe, the box having an air inlet and a preheated air outlet connected to the combustion air blower.

[0013] Furthermore, the feed pipe is equipped with a thermocouple connection interface in the section near the water tank.

[0014] Furthermore, the material channel inside the elbow pipe is bent at 90°.

[0015] Furthermore, the water tank is provided with a cooling water inlet and a cooling water outlet, which are respectively connected to the cooling water circulation system.

[0016] Furthermore, the combustion air preheating box includes: a box body with an arc-shaped inner wall, the arc being a superior arc, the guide pipe being circular, the box body being placed on top of the guide pipe and its inner arc surface being attached to the outer arc surface of the guide pipe;

[0017] The material discharge port is located at the bottom of the guide pipe below the air box, and the upper end of the material discharge hopper has an arc-shaped groove that fits into the arc-shaped surface at the bottom of the guide pipe that is not covered by the box.

[0018] Furthermore, the feed tube has a middle section with an inner diameter larger than its left and right sections.

[0019] The beneficial effects of this utility model are:

[0020] 1. The material flow inside the elbow pipe is cooled by the circulating cooling water in the water tank, which makes the finished material quickly change from a molten state to a fixed particle state, preventing the finished particles in the molten state from sticking to the elbow pipe and causing material accumulation or even pipe blockage.

[0021] 2. By setting up intersecting horizontal pipes and hoppers, a portion of the hotter material flow is fed into the heating cavity of the preheating furnace to heat it, while the other portion falls directly into the finished product silo due to gravity. This distributes the proportion of material in the flow, allowing the material heated in the preheating furnace to smoothly enter the finished product silo via a cyclone separator under the system's induced draft. This fully utilizes preheating to heat the preheating furnace.

[0022] 3. A bellows is installed on the horizontal pipe. The horizontal pipe heats the air flowing inward. The heated air is then supplied to the combustion gas by the combustion fan. This not only improves the combustion efficiency but also makes full use of the waste heat of the expansion furnace. Attached Figure Description

[0023] To more clearly illustrate the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is the front view of the present utility model;

[0025] Figure 2 This is a perspective view of the present invention;

[0026] Figure 3 This is a two-dimensional view of the present invention.

[0027] Figure 4 This is a sectional perspective view of the present invention;

[0028] Figure 5 This is a perspective view of the bellows and the hopper of this utility model;

[0029] Figure 6 This is a perspective view of the bellows of this utility model;

[0030] Figure 7 This is a perspective view of the material discharge hopper of this utility model;

[0031] Figure 8 This is a perspective view of the water tank of this utility model;

[0032] Figure 9 This is a perspective view of an embodiment where the middle section of the feed tube of this utility model is thicker;

[0033] Figure 10 This is a front view with dimensions of a specific embodiment of the product of this utility model;

[0034] Figure 11 for Figure 10 Middle left view;

[0035] Figure 12 for Figure 10 Mid-top view;

[0036] Figures 10-12 The unit for length dimension markings is mm.

[0037] Explanation of reference numerals in the attached drawings: Elbow pipe 1, guide pipe 2, discharge port 201, thermocouple connection interface 202, middle section of pipe body 203, water tank 3, cooling water inlet 301, cooling water outlet 302, 303, discharge hopper 4, arc-shaped groove 401, air box 5, air inlet 501, air outlet 502. Detailed Implementation

[0038] The following will refer to the appendix in the embodiments of this utility model. Figure 1-12 The technical solutions in the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0039] This utility model discloses a waste heat recovery type water-cooled horizontal pipe feeding system, such as Figure 4 As shown, it includes an elbow pipe 1 connected to the material outlet flange at the top of the expansion furnace. The elbow pipe 1 has a material channel that is bent at 90°. The reason for using a 90° bent material channel is that the expansion furnace is placed vertically, while the guide pipe 2 is placed horizontally. Therefore, a 90° elbow pipe 1 is needed to convert the vertical angle into a horizontal angle. The material flow is rapidly upward under the action of the combustion air at the bottom of the expansion furnace and passes through the elbow pipe 1.

[0040] Circulating cooling module, such as Figure 1-4 as well as Figure 8As shown, a cylindrical water tank 3 is fitted around the elbow pipe 1. The water tank 3 has installation interfaces 303 on its side walls and bottom that seal with both ends of the elbow pipe 1, and is connected to a cooling water circulation system. The water tank 3 is a cylindrical shell closed at both ends. The cylindrical shell is placed vertically, and a cooling water inlet 301 and a cooling water outlet 302 are respectively provided at the top of the cylindrical shell. The cooling water inlet 301 and the cooling water outlet 302 are connected to the cooling water circulation system, which circulates cooling water to the water tank 3 to cool the elbow pipe 1 inside the water tank 3. The expanded perlite material is in a molten state before entering the elbow pipe 1. Because the material channel inside the elbow pipe 1 is cooled by cooling water, the temperature of the molten material flow decreases from 900-1050℃ to 680-780℃ when it enters the elbow pipe, and the material changes from a molten state to a granular state. The cooling here prevents the high-speed molten material from sticking to the bent part of the elbow pipe 1, causing material accumulation. The cooling water circulation system consists of circulation pipelines, circulation pumps, and cooling units, which are existing technologies and will not be described in detail here.

[0041] Waste heat recovery components, such as Figure 4 As shown, it includes a horizontally arranged guide pipe 2, one end of which is connected to the outlet of the elbow pipe 1, and the other end is connected to the heating chamber of the preheating furnace.

[0042] Material dispensing device, such as Figure 4As shown, the system includes a hopper 4 located at the bottom of the feed pipe 2. The feed pipe 2 has a discharge port 201 at its bottom, which is connected to the finished product silo. The material flows into the horizontally placed feed pipe 2 through the elbow pipe 1. The feed pipe 2 has a discharge port 201 at its lower part. Some of the heavier material particles fall into the hopper from the discharge port 401. The material in the hopper 4 is then transported to the finished product silo. The other part of the lighter material enters the heating chamber of the preheating furnace under the action of the system's induced draft, heating the heating chamber. Subsequently, the material flow passes through a cyclone separator to separate the waste gas, and the remaining material enters the finished product silo. This utility model relates to a preheating furnace for supplying waste heat. The preheating furnace has at least one horizontal inner core tube channel and a perlite ore raw material channel enclosing the inner core tube. The inner core tube channel forms a heating chamber to heat the perlite ore within the perlite ore channel. The perlite ore raw material channel has a spiral conveying mechanism that transports the perlite ore from the inlet to the outlet, where it is preheated. The expanded perlite falling from the discharge port 201 of the guide pipe falls under its own weight, while lighter materials and dust-containing exhaust gas are drawn into the cyclone separator from the horizontally arranged inner core tube channel of the preheating furnace by the system's induced draft. Under centrifugal force, the finished product falls to the bottom and is then transported by air to the finished product silo for storage. The dust-containing exhaust gas enters a multi-tube dust collector for depressurization, cooling, and dust collection. After depressurization and cooling, the exhaust gas enters a pulse bag filter for secondary filtration, further filtering out dust. The treated exhaust gas is then discharged through a chimney in compliance with emission standards. Finished products are packaged through the receiving port at the bottom of the silo and then stored or sold. Both the feed pipe 2 and the elbow pipe 1 are made of heat-conducting materials, such as aluminum and stainless steel.

[0043] As one embodiment of this utility model, such as Figure 1-4 As shown, the waste heat recovery assembly also includes a combustion air preheating box 5 fitted in the middle section of the feed pipe 2. The box 5 has an air inlet 501 and a preheated air outlet 502 connected to the combustion air blower. The preheating box 5 is wrapped around the feed pipe 2, allowing the feed pipe 2 to heat the air in the preheating box 5. The air inside the preheating box 5 enters through the air inlet 501 under the action of the combustion air blower, is heated, and then exits through the air outlet 502. This preheating box 5 repurposes the waste heat from the material flow discharged from the top of the expansion furnace to heat the combustion air in the burner at the bottom of the expansion furnace, increasing the combustion efficiency of the combustion air and further saving energy.

[0044] As one embodiment of this utility model, such as Figure 1 and 2As shown, the feed pipe 2 has a thermocouple connection interface 202 near the water tank 3. This thermocouple connection interface 202 is used to install a thermocouple. The thermocouple is sealed to this connection interface. The thermocouple is used to detect the temperature of the material flow out of the elbow pipe 1, facilitating material temperature monitoring. Based on the temperature detected by the thermocouple, the cooling water temperature and cooling water circulation speed in the water tank 3 are adjusted, as are the cooling water temperature and flow rate in the water tank 3 according to the preheating requirements of the flame-retardant air and the preheating furnace.

[0045] As one embodiment of this utility model, such as Figure 4 , 5 As shown in Figures 6 and 7, the combustion air preheating box 5 includes: a box body with an arc-shaped inner wall, the arc being an arc shape; the guide pipe 2 is circular; the box body is placed on the upper part of the guide pipe 2 and its inner arc surface is attached to the outer circular surface of the guide pipe 2; the inside of the box body forms a sealed cooling cavity, and an air inlet 501 and an air outlet 502 are connected to the cavity.

[0046] The discharge port 201 is located at the bottom of the guide pipe 2 below the air box 5. The upper surface of the discharge hopper 4 has an arc-shaped groove 401, which fits into the arc-shaped surface at the bottom of the guide pipe 2 that is not covered by the box.

[0047] In this embodiment, such as Figure 4 and 5 As shown, the combustion preheating air box 5 and the discharge hopper 4 are installed on the same section of the guide pipe 2, increasing the compactness of the structure and saving the length of the guide pipe 2. In this embodiment, the air box 5 is generally arc-shaped with an angle greater than 180°, and has a notch at the bottom. This notch exposes a portion of the circular guide pipe 2, which is used to set the discharge port 201 and install the discharge hopper 4. The discharge hopper 4 is generally a cone-shaped hopper that is larger at the top and smaller at the bottom, and it has a discharge channel that is open at both the top and bottom. During the process of the material flow through the guide pipe 2, part of its heat is absorbed by the air in the air box 5, which is used to preheat the combustion air for the burner at the bottom of the expansion furnace. The heavier material falls from the discharge port 201, while the lighter material and the hot air containing dust enter the linear heating chamber channel of the preheating furnace to preheat the raw material ore in the preheating furnace.

[0048] As one embodiment of this utility model, such as Figure 9 As shown, the inner diameter of the middle section of the material channel inside the feed pipe 2 is larger than that of its left and right sections. The inner diameter of the larger material channel in this middle section gradually narrows towards both ends until it connects with the material channels at the left and right ends. The wind box 5 and the discharge hopper 4 are located on the middle section 203 of this larger inner diameter feed pipe, allowing more finished material to fall from the discharge port 201. This reduces the pressure on the system's induced draft system to guide the material from the preheating furnace into the cyclone separator.

Claims

1. A waste heat recovery type water-cooled horizontal pipe feeding system, characterized in that, include: Elbow pipe (1), which is connected to the material outlet at the top of the expansion furnace, the elbow pipe (1) has a material channel that is bent at a certain angle; The circulating cooling module includes a water tank (3) fitted outside the elbow pipe (1). The side wall and bottom of the water tank (3) are respectively provided with installation interfaces (303) that are sealed and matched with both ends of the elbow pipe (1), and the water tank (3) is connected to a cooling water circulation system. The waste heat recovery assembly includes a horizontally arranged feed pipe (2), one end of which is connected to the outlet of the elbow pipe (1), and the other end is connected to the heating chamber of the preheating furnace; The material distribution device includes a material hopper (4) located at the bottom of the material guide pipe (2). The bottom of the material guide pipe (2) has a material outlet (201) placed in the material hopper (4). The material hopper (4) is connected to the finished product silo.

2. The waste heat recovery type water-cooled horizontal pipe feeding system according to claim 1, characterized in that, The waste heat recovery assembly also includes a combustion air preheating box (5) fitted in the middle section of the feed pipe (2), the box (5) having an air inlet (501) and a preheated air outlet (502) connected to the combustion air blower.

3. The waste heat recovery type water-cooled horizontal pipe feeding system according to claim 1, characterized in that, The feed pipe (2) is provided with a thermocouple connection interface (202) in the section of the pipe near the water tank (3).

4. The waste heat recovery type water-cooled horizontal pipe feeding system according to claim 1, characterized in that, The material channel inside the elbow pipe (1) is bent at 90°.

5. The waste heat recovery type water-cooled horizontal pipe feeding system according to claim 1, characterized in that, The water tank (3) is provided with a cooling water inlet (301) and a cooling water outlet (302), which are respectively connected to the cooling water circulation system.

6. The waste heat recovery type water-cooled horizontal pipe feeding system according to claim 2, characterized in that, The combustion air preheating box (5) includes: a box body with an arc-shaped inner wall, the arc being an arc-shaped structure; the guide pipe (2) is circular; the box body is placed on the upper part of the guide pipe (2) and its inner arc surface is attached to the outer circular surface of the guide pipe (2); The discharge port (201) is located at the bottom of the guide pipe (2) below the air box (5). The upper end of the discharge hopper (4) has an arc-shaped groove (401), which fits on the arc-shaped surface at the bottom of the guide pipe (2) that is not covered by the box.

7. The waste heat recovery type water-cooled horizontal pipe feeding system according to claim 1, characterized in that, The feed tube (2) has a middle section (203) with an inner diameter greater than that of its left and right sections.

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