Waste heat recovery device for sensible heat of high-temperature magnesium slag

Abstract

The utility model relates to a waste heat recovery device for sensible heat of high-temperature magnesium slag, which is characterized in that a boiler is arranged on a support frame, the top end of the boiler is sequentially provided with a material pouring interface and a material distributor, the middle part of the boiler is sequentially provided with a first evaporation heating surface, a second evaporation heating surface and a coal economizer, and a first heating surface pipe wall is arranged in the first evaporation heating surface; a second heating surface pipe wall is arranged in the second evaporation heating surface, a third heating surface pipe wall is arranged in the coal economizer, the heating surface pipe walls exchange heat with magnesium slag, the heating surface pipe walls are all composed of heat exchange pipes, the heat exchange pipes are connected through fins and form a membrane wall structure, a cinder valve is arranged at the bottom end of the boiler, and material conveying equipment is arranged below the cinder valve. The boiler is provided with a plurality of thermometers for detecting temperature, the supporting frame is provided with a plurality of vibrators, the vibrators are in contact connection with the boiler, high-quality steam can be generated, the value of power generation or other purposes is high, and the whole waste heat recovery process is carried out in a closed environment.

Description

Technical Field

[0001] This utility model relates to a waste heat recovery device for the sensible heat of high-temperature magnesium slag. Background Technology

[0002] Currently, the main methods for treating magnesium slag in China are natural air cooling and slag cooler methods. Natural air cooling wastes all waste heat and is extremely environmentally unfriendly. Slag cooler methods have very low recovery efficiency, cannot generate steam, and are therefore very inefficient.

[0003] Some manufacturers have also introduced the air quenching method, also known as fluidized air cooling, which uses fluidized air to carry most of the fluidizable magnesium slag into the waste heat boiler for cooling. However, this method can only recover some of the waste heat from the magnesium slag powder, and the granular powder cannot be recovered. Furthermore, the waste heat boiler is prone to bridging and blockage, leading to frequent boiler malfunctions. Utility Model Content

[0004] This invention relates to a waste heat recovery device for high-temperature magnesium slag sensible heat, which can generate high-quality steam with high value for power generation or other uses. The entire waste heat recovery process is carried out in a closed environment, which is environmentally friendly.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A waste heat recovery device for sensible heat of high-temperature magnesium slag, characterized in that: a boiler is installed on a support frame, and a discharge port and a distributor are sequentially installed on the top of the boiler;

[0007] The boiler is provided with a first evaporation heating surface, a second evaporation heating surface and an economizer in the middle section. The first evaporation heating surface is provided with a first heating surface tube wall, the second evaporation heating surface is provided with a second heating surface tube wall, and the economizer is provided with a third heating surface tube wall. The first heating surface tube wall, the second heating surface tube wall and the third heating surface tube wall exchange heat with magnesium slag respectively. The first heating surface tube wall, the second heating surface tube wall and the third heating surface tube wall are all composed of heat exchange tubes. The heat exchange tubes are connected by fins and form a membrane wall structure.

[0008] An ash discharge valve is installed at the bottom of the boiler, and a material conveying device is installed below the ash discharge valve to allow the cooled magnesium slag to fall and be transported away.

[0009] The boiler is equipped with several thermometers for temperature detection, and the support frame is equipped with several vibrators. The vibrators are in contact with the boiler and the vibrators mix the magnesium slag thoroughly by tapping the boiler.

[0010] The waste heat recovery device for the sensible heat of high-temperature magnesium slag includes: a discharge port for dumping magnesium slag into a slag truck; a screening device inside the discharge port for removing impurities and large, caking pieces of magnesium slag; and magnesium slag being evenly dropped onto the flow cross section of the boiler via a distributor.

[0011] The waste heat recovery device for the sensible heat of high-temperature magnesium slag includes: a cold slag outlet at the end of the conveying equipment, for the falling magnesium slag to be transported to a storage bin for accumulation, short-term natural cooling, and finally sent to the subsequent cold slag treatment process.

[0012] The waste heat recovery device for the sensible heat of high-temperature magnesium slag includes: the ash discharge valve is controlled by the temperature detected by the thermometer, and its opening and closing degree is controlled; the vibrator is controlled by the temperature detected by the thermometer and taps the abnormal temperature area of ​​the boiler to ensure that the magnesium slag is fully mixed in the boiler.

[0013] The beneficial effects of this utility model are as follows: 1. Because the temperature of magnesium slag reaches about 1000℃, it can generate high-quality steam with a steam pressure of over 9.8 MPa, which is of high value for power generation or other uses. The temperature of magnesium slag can be reduced to 100 degrees Celsius or even lower. Firstly, the waste heat recovery efficiency is extremely high, and the thermal efficiency (thermal efficiency = (1000-100) / (1000-20) = 91.8%) reaches over 80%. At the same time, the magnesium slag, which is close to room temperature and in a dry state, is very friendly to subsequent processes. The magnesium slag exiting the boiler only needs to be allowed to cool naturally for a short time before it can be sent to the subsequent processing process.

[0014] 2. The entire waste heat recovery process is carried out in a closed environment, which is environmentally friendly. Attached Figure Description

[0015] Figure 1 This is a structural diagram of a waste heat recovery device for the sensible heat of high-temperature magnesium slag.

[0016] Figure 2 Another structural view of the waste heat recovery device for the sensible heat of high-temperature magnesium slag.

[0017] Figure 3 This is a structural diagram of the heat exchange tubes and fins.

[0018] Explanation of reference numerals in the attached drawings: 1-Slag truck; 2-Boiler; 3-Support frame; 4-Material conveying equipment; 5-Discharge interface; 6-Distributor; 7-First evaporation heating surface; 8-Second evaporation heating surface; 9-Economizer; 10-Screening device; 11-Thermometer; 12-Vibrator; 13-Ash discharge valve; 14-Cold slag outlet; 15-First heating surface tube wall; 16-Second heating surface tube wall; 17-Third heating surface tube wall; 18-Heat exchange tube; 19-Fin; 20-Magnesium slag. Detailed Implementation

[0019] like Figures 1 to 3 The present invention discloses a waste heat recovery device for high-temperature sensible heat of magnesium slag, characterized in that: a boiler 2 is provided on a support frame 3, and a discharge port 5 and a distributor 6 are sequentially provided on the top of the boiler 2. The discharge port 5 is used for the slag truck 1 to pour in the magnesium slag 20. A screening device 10 is provided in the discharge port 5 to remove impurities and large pieces of calcined magnesium slag 20. The magnesium slag 20 can be evenly dropped onto the flow section of the boiler 2 through the distributor 6.

[0020] The boiler 2 is provided with a first evaporation heating surface 7, a second evaporation heating surface 8 and an economizer 9 in the middle. The first evaporation heating surface 7 is provided with a first heating surface tube wall 15, the second evaporation heating surface 8 is provided with a second heating surface tube wall 16, and the economizer 9 is provided with a third heating surface tube wall 17. The first heating surface tube wall 15, the second heating surface tube wall 16 and the third heating surface tube wall 17 exchange heat with magnesium slag 20 respectively. The first heating surface tube wall 15, the second heating surface tube wall 16 and the third heating surface tube wall 17 are all composed of heat exchange tubes 18. The heat exchange tubes 18 are connected by fins 19 and form a membrane wall structure.

[0021] The bottom of the boiler 2 is provided with an ash discharge valve 13, and a material conveying device 4 is provided below the ash discharge valve 13 to allow the cooled magnesium slag 20 to fall and be transported away. The end of the material conveying device 4 is provided with a cold slag outlet 14 to allow the fallen magnesium slag 20 to be transported to a storage bin for accumulation, short-term natural cooling, and finally sent to the subsequent cold slag treatment process.

[0022] The boiler 2 is equipped with several thermometers 11 for temperature detection. The ash discharge valve 13 is controlled by the temperature detected by the thermometers 11. The support frame 3 is equipped with several vibrators 12. The vibrators 12 are in contact with the boiler 2. The vibrators 12 are controlled by the temperature detected by the thermometers 11 and tap the abnormal temperature areas of the boiler 2 to ensure that the magnesium slag 20 is fully mixed in the boiler 2.

[0023] In this embodiment, the slag truck 1 guides the magnesium slag 20 into the discharge port 5. The magnesium slag 20 is then screened by the screening device 10 to remove impurities and large, caking pieces. After screening, the magnesium slag 20 is evenly distributed onto the flow section of the boiler 2 via the distributor 6. The magnesium slag 20 flows slowly by its own weight through the first evaporation heating surface 7, the second evaporation heating surface 8, and the economizer 9 of the boiler 2, and undergoes heat transfer through the heat exchange tubes 18 and fins 19, ultimately converting the water in the heat exchange tubes 18 into steam, thus achieving waste heat recovery. The magnesium slag 20 may cause a core-pulling phenomenon within the boiler 2. If a temperature anomaly is detected in an area of ​​the boiler 2 by the thermometer 11, the corresponding area of ​​the boiler 2 will be activated. The vibrator 12 is used to tap the magnesia slag 20, which can ensure that the magnesia slag 20 is fully mixed and avoids areas where the magnesia slag 20 is not fully filled. When the temperature of the magnesia slag 20 drops below 400°C, there is a problem of weathering and volume expansion. When the temperature of the magnesia slag 20 in the boiler 2 is detected by the thermometer 11 to drop below 400°C, the vibrator 12 taps the boiler 2, leaving enough space for the magnesia slag 20 to weather and expand, reducing the stress on the heat exchange tube 18 and fins 19 caused by the expansion. At the same time, when the newly fallen magnesia slag 20 falls into this area, it can be fully mixed with the weathered magnesia slag 20, without the core being pulled out, allowing the magnesia slag 20 to have full contact and improving the heat exchange efficiency.

[0024] The magnesium slag 20 normally needs to stay in the boiler 2 for about 10 hours from entering the boiler 2 until it falls off the ash discharge valve 13. If the temperature displayed at the ash discharge valve 13 is high, it means that the heat exchange effect is not good during this period. In this case, the opening of the ash discharge valve 13 is controlled and reduced, or even closed, to prolong the residence time of the magnesium slag 20 in the boiler 2. The temperature of the magnesium slag 20 falling onto the material conveying equipment 4 through the ash discharge valve 13 can reach about 100°C to ensure that the magnesium slag 20 is fully cooled.

[0025] The above embodiments are merely illustrative examples of this utility model and are not intended to limit the scope of protection of this utility model. Those skilled in the art can make simple changes or substitutions based on the above embodiments without departing from the technical concept of this utility model, but these changes will still fall within the scope of protection of this utility model.

Claims

1. A high-temperature magnesium slag sensible heat waste heat recovery device, characterized by: Support frame (3) is provided with boiler (2), the top end of the boiler (2) is sequentially provided with pouring interface (5) and distributor (6); The middle part of the boiler (2) is sequentially provided with first evaporation heating surface (7), second evaporation heating surface (8) and coal economizer (9), the first evaporation heating surface (7) is provided with first heating surface pipe wall (15), the second evaporation heating surface (8) is provided with second heating surface pipe wall (16), the coal economizer (9) is provided with third heating surface pipe wall (17), the first heating surface pipe wall (15), the second heating surface pipe wall (16) and the third heating surface pipe wall (17) are respectively in heat exchange with magnesium slag (20), the first heating surface pipe wall (15), the second heating surface pipe wall (16) and the third heating surface pipe wall (17) are all composed of heat exchange pipe (18), the heat exchange pipe (18) is connected by fin (19) and constitutes membrane type wall structure; The bottom end of the boiler (2) is provided with ash valve (13), the lower part of the ash valve (13) is provided with material conveying equipment (4), for falling and conveying the cooled magnesium slag (20); The boiler (2) is provided with several thermometers (11) for detecting temperature, the support frame (3) is provided with several rappers (12), the rapper (12) is connected with the boiler (2), the rapper (12) knocks the boiler (2) to make the magnesium slag (20) mix fully.

2. The high-temperature magnesium slag sensible heat waste heat recovery device according to claim 1, characterized in that: The pouring interface (5) is used for the magnesium slag (20) poured into the magnesium slag (20) by the magnesium slag (20), the pouring interface (5) is provided with screening device (10) for excluding impurities and large magnesium slag (20), the magnesium slag (20) can be evenly dropped on the flow cross section of the boiler (2) through the distributor (6).

3. The high-temperature magnesium slag sensible heat recovery device according to claim 1, characterized in that: The end of the material conveying equipment (4) is provided with a cold slag outlet (14), the falling magnesium slag (20) is transported to the storage bin for short natural cooling, and finally sent to the subsequent cold slag treatment process.

4. The high-temperature magnesium slag sensible heat recovery device according to claim 1, characterized in that: The ash valve (13) controls the opening and closing degree according to the temperature detected by the thermometer (11), the rapper (12) knocks the abnormal temperature area of the boiler (2) according to the temperature detected by the thermometer (11), so that the magnesium slag (20) can mix fully in the boiler (2).

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