Energy-saving cooling device for titanium dioxide vacuum crystallization

Abstract

The utility model relates to the technical field of energy conservation, in particular to an energy-saving cooling device for titanium dioxide vacuum crystallization, which comprises a vacuum crystallization tank, a demister and a spray condenser, a heat exchange water tank is arranged on a pipeline at the bottom of the spray condenser, and the bottom of the heat exchange water tank is connected to the top of the spray condenser through a pipeline and a first circulating pump. An efficient heat exchange plate is arranged in the heat exchange water tank, and the two ends of the efficient heat exchange plate are connected with a lithium bromide refrigerator and a mechanical refrigerator in series. The lithium bromide refrigerator is connected to the heat exchanger; and the heat exchanger is communicated with a tail gas pipeline of the jet mill. The tail gas heat is used for heating a circulating medium of the lithium bromide refrigerating machine, the heat is utilized, so that a cooling medium is generated, the cooling medium reaches the required temperature in cooperation with the mechanical refrigerating machine, water in the heat exchange water tank is cooled, cooling and spraying of cooling water to the spraying condenser are facilitated, titanium liquid evaporation water vapor is removed, and the cooling efficiency of the lithium bromide refrigerating machine is improved. And the problem of matching of the tail gas heat and equipment can be solved while the tail gas heat is utilized.

Description

TECHNICAL FIELD

[0001] The utility model relates to energy -conserving technical field especially a kind of energy -conserving cooling device of titanium dioxide vacuum crystallization. BACKGROUND

[0002] Rutile type titanium dioxide aftertreatment's airflow pulverizer utilizes the tangential collision of high-speed flow of powder particles driven by medium-pressure superheated steam flow to obtain small particles, and the superheated steam still has available heat after product grinding work. Under normal circumstances, the tail gas waste heat of an airflow pulverizer with a production capacity of 3.5 t / h is equivalent to the heat value generated by 490 kg of standard coal. The heat of these tail gas can only be treated by a spray tower, and some enterprises directly discharge the heat without recycling. Some enterprises use desalted water after spray heat exchange for three-washing filter presses, and these recycling processes all have the problem of heat matching with equipment, which affects the normal operation of the equipment.

[0003] Therefore, a device capable of recycling the heat of tail gas is designed. CONTENT OF UTILITY MODEL

[0004] The utility model discloses a kind of energy -conserving cooling device of titanium dioxide vacuum crystallization to solve above-mentioned technical deficiency, can utilize the tail gas waste heat of airflow pulverizer, for the vacuum cooling of titanium dioxide vacuum crystallization, strong applicability.

[0005] The utility model discloses an energy -conserving cooling device of titanium dioxide vacuum crystallization, including vacuum crystallization jar, demister and spray condenser, the demister is set in the top of vacuum crystallization jar, the demister is connected with spray condenser, heat exchange water tank is set on the pipeline of spray condenser bottom, overflow pipe is set in the upper end of heat exchange water tank, heat exchange water tank bottom is connected to the top of spray condenser by pipeline and first circulating pump, high-efficiency heat exchange plate is set in heat exchange water tank, one end of the high-efficiency heat exchange plate is connected to lithium bromide refrigerator water inlet end, lithium bromide refrigerator water outlet end is connected to the water inlet end of mechanical refrigeration machine, mechanical refrigeration machine water outlet end is connected to intermediate water tank, the bottom of intermediate water tank is connected to the other end of high-efficiency heat exchange plate by pipeline and second circulating pump;Medium inlet pipe and medium outlet pipe are set on lithium bromide refrigerator, and medium inlet pipe and medium outlet pipe are connected to heat exchanger, and the heat exchanger is connected with airflow pulverizer tail gas pipeline.

[0006] It further includes circulating water pool and spray tower, the spray tower is set on circulating water pool, and is connected to lithium bromide refrigerator and mechanical refrigeration machine by pipeline and third circulating pump at the bottom of circulating water pool, and lithium bromide refrigerator and mechanical refrigeration machine are both connected to spray tower by pipeline.

[0007] The spray condenser is connected to a Roots pump and a liquid ring pump for evacuating the vacuum crystallizer, demister, and the interior of the spray condenser. The outlet pipe of the first circulation pump is also connected to the Roots pump and the liquid ring pump, which are connected to the heat exchange tank via pipes.

[0008] The energy-saving cooling device for vacuum crystallization of titanium dioxide obtained by this invention uses the heat from the exhaust gas to heat the circulating medium of the lithium bromide refrigeration unit, thereby utilizing the heat to generate a cooling medium. In conjunction with a mechanical refrigeration unit, the cooling medium reaches the required temperature to cool the water in the heat exchange tank. This facilitates the cooling water spraying onto the spray condenser, removing water vapor from the evaporated titanium liquid. This not only realizes the utilization of the exhaust gas heat but also solves the problem of matching the exhaust gas heat with the equipment. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0010] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0011] Example 1:

[0012] like Figure 1 As shown, this utility model discloses an energy-saving cooling device for vacuum crystallization of titanium dioxide, including a vacuum crystallization tank 1, a demister 2, and a spray condenser 3. The demister 2 is located at the top of the vacuum crystallization tank 1 and is connected to the spray condenser 3. A hot water exchange tank 6 is installed on a pipe at the bottom of the spray condenser 3, and an overflow pipe 8 is installed at the top of the hot water exchange tank 6. The bottom of the hot water exchange tank 6 is connected to the top of the spray condenser 3 through a pipe and a first circulation pump 9. A high-efficiency heat exchange plate 7 is installed inside the hot water exchange tank 6. One end is connected to the water inlet of the lithium bromide chiller 10, the water outlet of the lithium bromide chiller 10 is connected to the water inlet of the mechanical chiller 11, the water outlet of the mechanical chiller 11 is connected to the intermediate water tank 12, and the bottom of the intermediate water tank 12 is connected to the other end of the high-efficiency heat exchange plate 7 through a pipe and the second circulation pump 18; the lithium bromide chiller 10 is provided with a medium inlet pipe 14 and a medium outlet pipe 13, which are connected to the heat exchanger 16, and the heat exchanger 16 is connected to the exhaust gas pipe 17 of the air jet pulverizer.

[0013] In the titanium liquid crystallization system, the defoamer 2 at the top of the vacuum crystallization tank 1 is communicated with the spray condenser 3, the spray condenser 3 is connected with the vacuum system, and the vacuum environment in the vacuum crystallization tank 1 is realized. In the process of vacuumizing, a large amount of steam enters the spray condenser 3, and needs to be cooled and removed. Therefore, the cooling water needs to be sprayed at the top of the spray condenser 3 to cool and remove the heat and steam. The water in the heat exchange water tank 6 in the embodiment is composed of the spray water and the steam condensed water, and returns to the heat exchange water tank 6, and the excess water can flow out from the overflow pipe 8 to keep the water level stable. The water sprayed on the spray condenser 3 is pumped from the bottom of the heat exchange water tank 6 to the top of the spray condenser 3 by the first circulating pump 9. Obviously, the water temperature transported from the first circulating pump 9 to the spray condenser 3 is relatively low, and the temperature of the water returned by the spray water and the steam condensed water after spraying is relatively high, so the water in the heat exchange water tank 6 needs to be cooled. In the embodiment, the high-efficiency heat exchange plate 7 is arranged in the heat exchange water tank 6, and the cooling medium is introduced into the high-efficiency heat exchange plate 7, so that the water in the heat exchange water tank 6 can be cooled.

[0014] When the heat exchange water tank 6 is cooled, the cooling medium needs to provide cold energy by the refrigerating machine. In the embodiment, in order to utilize the tail gas heat of the jet mill, the heat exchanger 16 is arranged on the tail gas pipeline 17 of the jet mill, and the lithium bromide refrigerating machine 10 and the mechanical refrigerating machine 11 are combined. The medium inlet pipe 14 and the medium outlet pipe 13 of the lithium bromide refrigerating machine 10 are connected with the heat exchanger 16, and the tail gas heat of the jet mill can heat the medium in the medium inlet pipe 14 and the medium outlet pipe 13 in the heat exchanger 16 to about 85 DEG C. By using the medium at 85 DEG C in the lithium bromide refrigerating machine 10, cooling can be generated in the lithium bromide refrigerating machine 10, and the cooling water is cooled. The cooled cooling water enters the mechanical refrigerating machine 11 again to be refrigerated, so that the outlet water temperature of the cooling water reaches the required temperature. In this form, the lithium bromide refrigerating machine 10 and the mechanical refrigerating machine 11 are combined, which can effectively solve the matching problem of the tail gas heat and the equipment.

[0015] The mechanical refrigerating machine 11 can be a centrifugal refrigerating machine or a screw refrigerating machine.

[0016] The fourth circulating pump 15 is arranged on the medium outlet pipe 13, which is used for medium circulation.

[0017] The monitoring of temperature data in normal use of the present embodiment: the cooling water temperature in the heat exchange water tank 6 is 12℃ when entering the lithium bromide refrigerator 10, the cooling water temperature outputted after refrigeration by the lithium bromide refrigerator 10 is 7℃, the cooling water temperature of 7℃ enters the mechanical refrigerator 11, the cooling water temperature outputted after refrigeration by the mechanical refrigerator 11 is 2℃, the cooling water of 2℃ enters the high-efficiency heat exchange plate 7 to cool and exchange heat with the water in the heat exchange water tank 6, so as to keep it at about 7℃, which is used for spraying the condenser 3.

[0018] The circulating water pool 20 and the spraying tower 21 are also included, the spraying tower 21 is arranged on the circulating water pool 20, and is connected to the lithium bromide refrigerator 10 and the mechanical refrigerator 11 through a pipeline and the third circulating pump 19 at the bottom of the circulating water pool 20, and the lithium bromide refrigerator 10 and the mechanical refrigerator 11 are both connected to the spraying tower 21 through a pipeline.

[0019] Since the lithium bromide refrigerator 10 and the mechanical refrigerator 11 will also generate heat during work, a cooling system is needed to cool them. Therefore, the water in the circulating water pool 20 is transported to the lithium bromide refrigerator 10 and the mechanical refrigerator 11 to cool them, the temperature of the circulating water is increased, and then the water is transported to the spraying tower 21 to be sprayed and cooled, and then enters the circulating water pool 20 for recycling.

[0020] The Roots pump 4 and the liquid ring pump 5 are connected to the spraying condenser 3, which are used to pump vacuum in the vacuum crystallization tank 1, the defoamer 2 and the spraying condenser 3; the pipeline at the outlet end of the first circulating pump 9 is also connected to the Roots pump 4 and the liquid ring pump 5, and the Roots pump 4 and the liquid ring pump 5 are connected to the heat exchange water tank 6 through a pipeline.

[0021] Generally, the vacuum pumping system on the spraying condenser 3 is composed of the Roots pump 4 and the liquid ring pump 5, which will also generate heat in the working condition, so that the cooling water is needed to cool them. The pipeline at the outlet end of the first circulating pump 9 is connected to the Roots pump 4 and the liquid ring pump 5 to cool them, and the cooled water flows back to the heat exchange water tank 6 to be cooled. The Roots pump 4 and the liquid ring pump 5 are cooled by the cooling water in the heat exchange water tank 6, which has good cooling effect to ensure the normal work of the Roots pump 4 and the liquid ring pump 5.

[0022] In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can be explicitly or implicitly included one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0023] In the description of the present application, it needs to be understood that the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection; it can be directly connected, or indirectly connected through intermediate medium; it can be the interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0024] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "above" and "on" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "under", "below" and "under" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0025] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above with a preferred embodiment, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content without departing from the scope of the technical scheme of the present application, and any simplification, modification, equivalent change and modification of the above embodiments according to the technical essence of the present application are still within the scope of the technical scheme of the present application.

Claims

1. An energy-saving cooling device for vacuum crystallization of titanium dioxide, comprising a vacuum crystallization tank, a defoamer and a spray condenser, the defoamer being arranged at the top of the vacuum crystallization tank, and the defoamer being in communication with the spray condenser, characterized in that: The heat exchange water tank is provided on the pipeline at the bottom of the spray condenser, an overflow pipe is arranged at the upper end of the heat exchange water tank, the bottom of the heat exchange water tank is connected to the top of the spray condenser through a pipeline and a first circulating pump, high-efficiency heat exchange plates are arranged in the heat exchange water tank, one end of the high-efficiency heat exchange plates is connected to the water inlet end of the lithium bromide refrigerator, the water outlet end of the lithium bromide refrigerator is connected to the water inlet end of the mechanical refrigerator, the water outlet end of the mechanical refrigerator is connected to the intermediate water tank, the bottom of the intermediate water tank is connected to the other end of the high-efficiency heat exchange plates through a pipeline and a second circulating pump; a medium inlet pipe and a medium outlet pipe are arranged on the lithium bromide refrigerator, the medium inlet pipe and the medium outlet pipe are connected to a heat exchanger, and the heat exchanger is in communication with a tail gas pipeline of the airflow pulverizer. ​ 2. The energy-saving cooling device for vacuum crystallization of titanium dioxide according to claim 1, characterized in that: Further comprising a circulating water pool and a spray tower, the spray tower is arranged on the circulating water pool, and the bottom of the circulating water pool is connected to the lithium bromide refrigerator and the mechanical refrigerator through a pipeline and a third circulating pump, and the lithium bromide refrigerator and the mechanical refrigerator are both connected to the spray tower through a pipeline.

3. The energy-saving cooling device for vacuum crystallization of titanium dioxide according to claim 1, characterized in that: The spray condenser is connected with a Roots pump and a liquid ring pump, which are used for vacuumizing the inside of a vacuum crystallization tank, a defoaming device and the spray condenser; the pipeline at the outlet end of the first circulating pump is also connected to the Roots pump and the liquid ring pump, and the Roots pump and the liquid ring pump are connected to the heat exchange water tank through a pipeline.

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