Vertical fluidized bed circulating cooling system of aluminum oxide roasting furnace

Abstract

The utility model provides a vertical fluidized bed circulating cooling system of an aluminum oxide roasting furnace, which relates to the technical field of aluminum oxide production and comprises a vertical fluidized bed heat exchanger, a high-efficiency shell-and-tube heat exchanger main body, a water tank main body, a water pump, a circulating cooling system, a water tank water replenishing system and a flow control and regulation system, the vertical fluidized bed heat exchanger comprises a vertical fluidized bed tube pass outlet, a vertical fluidized bed tube pass inlet, a vertical fluidized bed shell pass inlet and a vertical fluidized bed shell pass outlet. According to the vertical fluidized bed circulating cooling system of the aluminum oxide roasting furnace, high-temperature circulating water is used for heating mother liquor, flat plate washing water and other media, the temperature of the heated mother liquor is not lower than 80 DEG C, waste heat of high-temperature aluminum oxide powder is used, and the circulating water is heated through the vertical fluidized bed heat exchanger; and the mother liquor is heated and decomposed by high-temperature circulating water at the outlet of the vertical fluidized bed through an efficient shell-and-tube heat exchanger, and is sent to an evaporation process, so that waste heat resources are fully utilized to the maximum extent, and the purposes of energy conservation, consumption reduction and waste heat recovery are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a circulating cooling system, concretely is a kind of alumina calcination furnace vertical sulfurization bed circulating cooling system, belong to alumina production technical field. BACKGROUND

[0002] The calcination process of alumina is the last procedure of alumina production, and the main task of the calcination process is to calcine aluminum hydroxide with attached water and crystal water at high temperature in a calcination furnace, remove the attached water and crystal water, so as to generate alumina product with required physical and chemical properties. After being cooled by a cyclone cooling system, the temperature of alumina is generally above 200℃, and it needs to be cooled to below 80℃ by a sulfurization bed cooler for transportation and packaging.

[0003] At present, the circulating water cooling heat is not utilized during the cooling process of the sulfurization bed cooler, a large amount of heat resources is wasted, the environment is polluted, and in summer and autumn, the temperature of circulating water is increased by more than 20℃, the load of circulating water cooling tower is increased, and the cooling efficiency is reduced.

[0004] Therefore, the utility model provides a kind of alumina calcination furnace vertical sulfurization bed circulating cooling system. UTILITY MODEL CONTENTS

[0005] The utility model provides a kind of alumina calcination furnace vertical sulfurization bed circulating cooling system to solve the problem that circulating water cooling heat is not utilized during the cooling process of the sulfurization bed cooler in prior art, a large amount of heat resources is wasted, and the environment is polluted.

[0006] The utility model is realized by the following technical scheme: a kind of alumina calcination furnace vertical sulfurization bed circulating cooling system, including vertical sulfurization bed heat exchanger, efficient tube-shell heat exchanger main body, water tank main body, water pump, circulating cooling system, water tank water replenishing system and flow control regulating system,

[0007] The vertical sulfurization bed heat exchanger includes vertical sulfurization bed shell side inlet, vertical sulfurization bed shell side outlet, vertical sulfurization bed tube side outlet and vertical sulfurization bed tube side inlet, the temperature of vertical sulfurization bed shell side inlet is 190℃-350℃, the temperature of vertical sulfurization bed shell side outlet is not higher than 80℃, the temperature of vertical sulfurization bed tube side inlet is 65℃-70℃, and the temperature of vertical sulfurization bed tube side outlet is not less than 92℃;

[0008] The high-efficiency tube-shell heat exchanger body comprises a high-efficiency tube-shell heat exchanger tube passage vent, a high-efficiency tube-shell heat exchanger shell passage inlet, a high-efficiency tube-shell heat exchanger tube passage outlet and a high-efficiency tube-shell heat exchanger tube passage blowdown port.

[0009] The water tank body comprises a water tank outlet, a water tank liquid level gauge port, a water tank vent, a water tank pressure gauge port, a water tank water supplement port and a water tank inlet.

[0010] Further, the circulating water temperature of the vertical sulfurization bed tube passage inlet is 65-70 DEG C, and the circulating water temperature of the vertical sulfurization bed tube passage outlet is not lower than 92 DEG C.

[0011] Further, the internal circulating water temperature of the high-efficiency tube-shell heat exchanger shell passage is not lower than 92 DEG C, and the shell passage circulating water outlet temperature is 68 DEG C.

[0012] Further, the mother liquor inlet temperature of the high-efficiency tube-shell heat exchanger tube passage is 45-50 DEG C, and the mother liquor outlet temperature of the high-efficiency tube-shell heat exchanger tube passage is not lower than 80 DEG C.

[0013] Further, the water pump is used for supplying water to the vertical sulfurization bed heat exchanger tube passage, and the water pump further comprises a check valve for circulating water tube passage flow setting and an automatic blowdown valve for abnormal circulating water flow setting during operation.

[0014] Further, the water tank body is used for preventing water loss during operation of the vertical sulfurization bed heat exchanger and the high-efficiency tube-shell heat exchanger circulating water, and the water tank body guarantees the water amount of the circulating water through a water tank water supplement system.

[0015] Further, the water amount of the water tank body is controlled by a liquid level pneumatic regulating valve and a flowmeter, and the water tank body is connected with a water supplement valve LV1204 on the side; when the liquid level reaches 20%, the water supplement valve LV1204 is automatically opened to supplement water through the water tank water supplement port; and when the liquid level reaches 80%, the water supplement valve LV1204 is automatically closed to stop water supplement.

[0016] The utility model provides a kind of vertical sulfurization bed circulating cooling system of alumina calcination furnace, it has the beneficial effects as follows:

[0017] 1, the vertical sulfurization bed circulating cooling system of alumina calcination furnace utilizes high-temperature circulating water to heat mother liquor, heats medium such as flat disc washing water, and the temperature of heated mother liquor is not lower than 80 DEG C, utilizes the waste heat of high-temperature alumina powder, heats circulating water by vertical sulfurization bed heat exchanger, and then heats decomposition mother liquor by high-temperature circulating water outlet of vertical sulfurization bed by high-efficiency tube-shell heat exchanger, is sent to evaporation procedure, and waste heat resource is maximized to utilize sufficiently, to reach the purpose of energy saving and consumption reduction waste heat recovery. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 This is a PID flow diagram of the vertical fluidized bed circulating cooling system for an alumina calcining furnace.

[0019] Explanation of reference numerals in the attached figures

[0020] 1. Vertical fluidized bed heat exchanger; 101. Vertical fluidized bed tube-side outlet; 102. Vertical fluidized bed tube-side inlet; 103. Vertical fluidized bed shell-side inlet; 104. Vertical fluidized bed shell-side outlet;

[0021] 2. Main body of high-efficiency shell-and-tube heat exchanger; 201. Vent port of tube side of high-efficiency shell-and-tube heat exchanger; 202. Shell inlet of high-efficiency shell-and-tube heat exchanger; 203. Outlet of tube side of high-efficiency shell-and-tube heat exchanger; 204. Drain port of tube side of high-efficiency shell-and-tube heat exchanger.

[0022] 3. Water tank body; 301. Water tank outlet; 302. Water tank level gauge port; 303. Water tank vent; 304. Water tank pressure gauge port; 305. Water tank water inlet; 306. Water tank inlet;

[0023] 4. Water pump; 5. Temperature and flow meter; 6. Water supply valve LV1204. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this application.

[0025] Please see Figure 1 The present invention proposes the following implementation scheme: a vertical fluidized bed circulating cooling system for an alumina calcining furnace, comprising a vertical fluidized bed heat exchanger 1, a high-efficiency shell-and-tube heat exchanger body 2, a water tank body 3, a water pump 4, a circulating cooling system, a water tank replenishment system, and a flow control and regulation system, and further comprising a water pump 4 and a temperature flow meter 5. The water pump 4 is used to supply water to the tube side of the vertical fluidized bed heat exchanger 1. The water pump 4 also includes a check valve for the circulating water tube side flow and an automatic discharge valve for abnormal circulating water flow during operation. This vertical fluidized bed circulating cooling system for an alumina calcining furnace utilizes high-temperature circulating water to heat the mother liquor and heat the plate washing water and other media. The temperature of the heated mother liquor is not lower than 80°C. The waste heat of the high-temperature alumina powder is used to heat the circulating water through the vertical fluidized bed heat exchanger 1, and then the mother liquor is heated and decomposed by the high-temperature circulating water at the outlet of the vertical fluidized bed through the high-efficiency shell-and-tube heat exchanger and sent to the evaporation process, thus maximizing the utilization of waste heat resources to achieve the purpose of energy saving, consumption reduction, and waste heat recovery.

[0026] The vertical sulfuration bed heat exchanger 1 comprises a vertical sulfuration bed tube passage outlet 101, a vertical sulfuration bed tube passage inlet 102, a vertical sulfuration bed shell passage inlet 103 and a vertical sulfuration bed shell passage outlet 104, the temperature of the vertical sulfuration bed shell passage inlet 103 is 190-350 DEG C, the temperature of the vertical sulfuration bed shell passage outlet 104 is not higher than 80 DEG C, the circulating water temperature of the vertical sulfuration bed tube passage inlet 102 is 65-70 DEG C, and the circulating water temperature of the vertical sulfuration bed tube passage outlet 101 is not lower than 92 DEG C.

[0027] The high-efficiency tube-shell heat exchanger main body 2 comprises a high-efficiency tube-shell heat exchanger tube passage vent 201, a high-efficiency tube-shell heat exchanger shell passage inlet 202, a high-efficiency tube-shell heat exchanger tube passage outlet 203 and a high-efficiency tube-shell heat exchanger tube passage blowdown port 204; the internal circulating water temperature of the high-efficiency tube-shell heat exchanger shell passage is not lower than 92 DEG C, and the shell passage circulating water outlet temperature is 68 DEG C; the mother liquor inlet temperature of the high-efficiency tube-shell heat exchanger tube passage is 45-50 DEG C, and the mother liquor outlet temperature of the high-efficiency tube-shell heat exchanger tube passage is not lower than 80 DEG C.

[0028] The water tank main body 3 comprises a water tank outlet 301, a water tank liquid level gauge port 302, a water tank vent 303, a water tank pressure gauge port 304, a water tank water supplement port 305 and a water tank inlet 306; the water tank body is used for preventing water loss during the operation of the vertical sulfuration bed heat exchanger 1 and the high-efficiency tube-shell heat exchanger circulating water, and the water tank body guarantees the water amount of the circulating water through a water tank water supplement system; the water amount of the water tank main body 3 is controlled by a liquid level pneumatic regulating valve and a flowmeter, the liquid level of the water tank main body 3 is controlled, and the water tank main body 3 is connected with a water supplement valve LV1204 on the side; when the liquid level reaches 20%, the water supplement valve LV1204 is automatically opened, water is supplemented through the water tank water supplement port 305, and when the liquid level reaches 80%, the water supplement valve LV1204 is automatically closed to stop water supplement.

[0029] In use, 190-350 DEG C high-temperature alumina powder heats circulating water through the vertical sulfuration bed heat exchanger 1, the baking furnace alumina discharge temperature is not higher than 80 DEG C, the circulating water inlet temperature is heated from 65-70 DEG C to not lower than 92 DEG C, the heated circulating water enters the high-efficiency tube-shell heat exchanger shell passage inlet 202, and 45-50 DEG C low-temperature mother liquor enters the high-efficiency tube-shell heat exchanger tube passage, heat exchange and transmission are carried out between the tube and shell passages, the temperature of the high-efficiency tube-shell heat exchanger tube passage outlet 203 is not lower than 80 DEG C, and the temperature of the high-efficiency tube-shell heat exchanger shell passage circulating water outlet is reduced to 68 DEG C.

[0030] The basic principle and main features of the present application and the advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. An alumina calciner vertical fluidized bed circulating cooling system characterized by: It comprises vertical sulfurized bed heat exchanger (1), high efficiency tube shell heat exchanger main body (2), water tank main body (3), water pump (4), circulating cooling system, water tank water supplement system and flow control regulation system. The vertical sulfurized bed heat exchanger (1) comprises vertical sulfurized bed tube passage outlet (101), vertical sulfurized bed tube passage inlet (102), vertical sulfurized bed shell passage inlet (103) and vertical sulfurized bed shell passage outlet (104), the temperature of vertical sulfurized bed shell passage inlet (103) is 190-350℃, the temperature of vertical sulfurized bed shell passage outlet (104) is not higher than 80℃, the temperature of vertical sulfurized bed tube passage inlet (102) is 65-70℃, and the temperature of vertical sulfurized bed tube passage outlet (101) is not lower than 92℃. The high efficiency tube shell heat exchanger main body (2) comprises high efficiency tube shell heat exchanger tube passage vent (201), high efficiency tube shell heat exchanger shell passage inlet (202), high efficiency tube shell heat exchanger tube passage outlet (203) and high efficiency tube shell heat exchanger tube passage blowdown (204). The water tank main body (3) comprises water tank outlet (301), water tank liquid level meter port (302), water tank vent (303), water tank pressure gauge port (304), water tank water supplement port (305) and water tank inlet (306).

2. The vertical fluidized bed circulating cooling system for alumina calcination furnace according to claim 1, characterized in that: The circulating water temperature of vertical sulfurized bed tube passage inlet (102) is 65-70℃, and the circulating water temperature of vertical sulfurized bed tube passage outlet (101) is not lower than 92℃.

3. The vertical fluidized bed circulating cooling system for alumina calcination furnace according to claim 1, characterized in that: The internal circulating water temperature of high efficiency tube shell heat exchanger shell passage is not lower than 92℃, and the outlet temperature of shell passage circulating water is 68℃.

4. The vertical fluidized bed circulating cooling system of an alumina calcination furnace according to claim 3, characterized in that: The mother liquid inlet temperature of high efficiency tube shell heat exchanger tube passage is 45-50℃, and the mother liquid outlet temperature of high efficiency tube shell heat exchanger tube passage is not lower than 80℃.

5. The vertical fluidized bed circulating cooling system for alumina calcination furnace according to claim 1, characterized in that: It also comprises water pump (4) and temperature flow meter (5), the water pump (4) is used for supplying water to vertical sulfurized bed heat exchanger (1) tube passage, and the water pump (4) also comprises check valve for circulating water tube passage flow setting and automatic blowdown valve for abnormal circulating water flow setting during operation.

6. The vertical fluidized bed circulating cooling system for alumina calcination furnace according to claim 1, characterized in that: The water tank main body is used for preventing water loss during operation of vertical sulfurized bed heat exchanger (1) and high efficiency tube shell heat exchanger circulating water, and the water tank main body guarantees water amount of circulating water through water tank water supplement system.

7. The circulating cooling system of a vertical fluidized bed of an alumina calcination furnace according to claim 6, characterized in that: The water amount of water tank main body (3) is controlled by liquid level pneumatic regulating valve and flow meter, the liquid level of water tank main body (3) is controlled, the water tank main body (3) is connected with water supplement valve LV1204 (6) on the side, when the liquid level reaches 20%, the water supplement valve LV1204 is automatically opened, water is supplemented through water tank water supplement port (305), when the liquid level reaches 80%, the water supplement valve LV1204 is automatically closed to stop water supplement.

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