Calcium-based reaction heat removal device

Abstract

The utility model discloses a calcium-based reaction heat removal device which sequentially comprises a CaO reactor, a settler and a heat recoverer, a reaction area, a first boiler tube and a first overheating heat exchanger are arranged in the CaO reactor; a first fluidizing gas inlet is formed in the bottom of the CaO reactor; a reactor outlet is formed in the top of the CaO reactor; a settler inlet is formed in the top of the settler and is communicated with the reactor outlet; a settling area, a second boiler tube and a first water-cooling coil are arranged in the settler; the water cooling coil pipe is arranged at the downstream of the settlement area; a second fluidizing gas inlet is formed in the bottom of the settler; a heat recoverer inlet is formed in the top of the heat recoverer; the heat recoverer inlet is communicated with the settler outlet; a third boiler tube and a second water-cooling coil are arranged in the heat recoverer; and a fluidizing gas outlet is formed in the side wall of the bottom of the heat recoverer. The calcium-based reaction heat removal device is high in heat recovery rate.

Description

TECHNICAL FIELD

[0001] The utility model relates to a calcium-based reaction heat taking device. BACKGROUND

[0002] The boiler feed water heating in the prior art usually uses solar energy direct heating or adopts the mode of electric heating, but the solar energy direct heating causes the utilization rate of solar energy to be low, and is not conducive to use at night without the sun, and the electric heating uses a large amount of electric energy, which is not conducive to environmental protection. In order to solve this problem, the energy storage technology is usually used to store the energy of sunlight for use at night.

[0003] At present, there are three heat storage modes in the solar heat utilization, namely sensible heat storage, latent heat storage and thermochemical storage. Compared with the other two, the thermochemical storage stores energy through the rearrangement of chemical bonds in the compound, has large energy storage capacity and density, and almost no energy loss, so that the medium and high temperature utilization of solar energy can be realized. The thermochemical storage systems that can be practically applied at present include the amino thermochemical storage system, the carbonic compound decomposition system, the metal hydride thermal decomposition system and the metal hydroxide decomposition system. Among them, the calcium-based system has small corrosion, high safety and low cost. Therefore, the calcium hydroxide system in the thermochemical storage is selected to realize the medium and high temperature utilization of solar energy, and has good energy storage efficiency.

[0004] However, there are still many problems in the application of calcium-based energy storage in the prior art, for example, the patent document CN115183209A discloses a steam recovery system and method, which provides a green, clean and energy-saving steam recovery system by using a calcium-based energy storage system. However, the calcium oxide reaction effect in the calcium oxide energy release device is poor, and the heat loss of the whole system is large, so that the stored heat is not completely released, and the heat recovery rate of the system is low. UTILITY MODEL CONTENTS

[0005] The utility model provides a calcium-based reaction heat taking device to overcome the problem of low heat recovery rate of the calcium-based energy storage system in the prior art. The calcium-based reaction heat taking device has high heat recovery rate.

[0006] The utility model mainly adopts the following technical scheme to solve the above technical problems:

[0007] The utility model provides a calcium-based reaction heat taking device, which comprises a CaO reactor, a settler and a heat recovery device in sequence.

[0008] The CaO reactor is internally provided with a reaction zone, a first boiler tube and a first superheated heat exchanger; the reaction zone is used for reacting CaO and reaction gas and releasing heat, so that boiler feed water in the first boiler tube is converted into saturated steam; the first superheated heat exchanger is used for converting saturated steam in the first boiler tube into superheated steam; the bottom of the CaO reactor is provided with a first fluidization gas inlet; and the top of the CaO reactor is provided with a reactor outlet.

[0009] The top of the settler is provided with a settler inlet in communication with the reactor outlet, and the settler inlet is used for conveying material reacted in the reaction zone to the settler; the interior of the settler is internally provided with a settling zone, a second boiler tube and a first water-cooled coil; the settling zone is used for further reacting unreacted material and releasing heat, so that boiler feed water in the second boiler tube is converted into saturated steam; the water-cooled coil is arranged downstream of the settling zone; the bottom of the settler is provided with a second fluidization gas inlet; and the top of the settler is provided with a settler outlet.

[0010] The top of the heat recovery device is provided with a heat recovery device inlet in communication with the settler outlet, and the heat recovery device inlet is used for conveying material reacted in the settling zone to the heat recovery device; the interior of the heat recovery device is internally provided with a third boiler tube and a second water-cooled coil; the side wall of the bottom of the heat recovery device is provided with a fluidization gas outlet in communication with the first fluidization gas inlet and the second fluidization gas inlet, respectively.

[0011] In the utility model, the material reacted in the settling zone includes fluidization gas and a small amount of Ca(OH)2 powder.

[0012] In the utility model, the reaction zone of the CaO reactor occurs the following reaction: CaO+H2O=Ca(OH)2, and the reaction is an exothermic reaction.

[0013] In the utility model, the first superheated heat exchanger can be arranged at the top of the reaction zone, around the reaction zone, at the bottom of the reaction zone or at one side of the reaction zone.

[0014] When the first superheated heat exchanger is arranged at one side of the reaction zone, the distance between the center of the first superheated heat exchanger and the top of the CaO reactor accounts for 25%-34% of the height of the CaO reactor.

[0015] The calcium-based reaction heat taking device further comprises a CaO material preparation device, the CaO material preparation device sequentially comprises a CaO feeding structure, a CaO processing structure, a CaO storage bin and a CaO feeding structure; the CaO feeding structure is used for conveying CaO to be processed into the CaO processing structure, the CaO processing structure is used for processing CaO and conveying the CaO to the CaO storage bin, and the CaO storage bin is used for storing CaO; the CaO feeding structure is connected with a reactor inlet of the CaO reactor, and the reactor inlet is arranged at the bottom of the CaO reactor.

[0016] Preferably, the CaO feeding structure is a pneumatic conveying structure or a screw conveying structure.

[0017] Preferably, the calcium-based reaction heat taking device further comprises a steam drum, and the steam drum is connected with the first boiler pipe, the second boiler pipe, the third boiler pipe, the first water cooling coil and the second water cooling coil.

[0018] Preferably, the calcium-based reaction heat taking device further comprises a boiler feed water module, and the boiler feed water module is connected with the first water cooling coil and the second water cooling coil.

[0019] Preferably, the calcium-based reaction heat taking device further comprises an alkali liquor pool, which is used for receiving waste discharged from the settler and the heat recovery device.

[0020] Preferably, a fan is arranged on a pipeline in communication with the first fluidization gas inlet and the second fluidization gas inlet, and the fan is used for recycling fluidization gas.

[0021] Preferably, the first water cooling coil is arranged in a spiral shape, a serpentine shape or a sleeve shape.

[0022] Preferably, the first water cooling coil is a light pipe or a finned tube.

[0023] Preferably, the second water cooling coil is arranged in a spiral shape, a serpentine shape or a sleeve shape.

[0024] Preferably, the second water cooling coil is a light pipe or a finned tube.

[0025] Preferably, the first boiler pipe is arranged in a membrane type water cooling wall, a spiral shape, a serpentine shape or a sleeve shape.

[0026] Preferably, the first boiler tube is arranged in a serpentine shape, and a ratio of a vertical distance between axes of two adjacent parallel tube bundles to an inner diameter of the first boiler tube is (2-2.5):1.

[0027] Preferably, the first boiler tube is a light tube, a finned tube or a finned tube.

[0028] Preferably, the second boiler tube is arranged in a membrane water cooling wall shape, a spiral shape, a serpentine shape or a sleeve shape.

[0029] Preferably, the second boiler tube is arranged in a serpentine shape, and a ratio of a vertical distance between axes of two adjacent parallel tube bundles to an inner diameter of the second boiler tube is (2-2.5):1.

[0030] Preferably, the second boiler tube is a light tube, a finned tube or a finned tube.

[0031] Preferably, the third boiler tube is arranged in a membrane water cooling wall shape, a spiral shape, a serpentine shape or a sleeve shape.

[0032] Preferably, the third boiler tube is arranged in a serpentine shape, and a ratio of a vertical distance between axes of two adjacent parallel tube bundles to an inner diameter of the third boiler tube is (2-2.5):1.

[0033] Preferably, the third boiler tube is a light tube, a finned tube or a finned tube.

[0034] Preferably, the first superheated heat exchanger is provided with a heat exchange tube, and the heat exchange tube is a light tube or a finned tube.

[0035] Preferably, the first superheated heat exchanger is provided with a heat exchange tube, and the heat exchange tube is arranged in a spiral shape, a serpentine shape or a sleeve shape.

[0036] Preferably, the settler is provided with a second superheated heat exchanger, and the second superheated heat exchanger is used for further heating saturated steam generated in the second boiler tube.

[0037] Preferably, the second superheated heat exchanger is provided with a heat exchange tube, and the heat exchange tube is a light tube or a finned tube.

[0038] Preferably, the second superheated heat exchanger is provided with a heat exchange tube, and the heat exchange tube is arranged in a spiral shape, a serpentine shape or a sleeve shape.

[0039] The first fluidization gas inlet preferably comprises 2-4 air inlet units, each of which is connected to the fluidization gas outlet.

[0040] Preferably, the center of each air inlet unit in the first fluidization gas inlet is vertically equidistant from the axis of the CaO reactor.

[0041] The second fluidization gas inlet preferably comprises 2-4 air inlet units, each of which is connected to the fluidization gas outlet.

[0042] Preferably, the center of each air inlet unit in the second fluidization gas inlet is vertically equidistant from the axis of the CaO reactor.

[0043] The positive progress effect of the present application is that:

[0044] The CaO material preparation device, CaO reactor, settler and heat recovery device are combined to form a calcium-based reaction heat extraction device, which can effectively prevent powder bridging, reduce dust accumulation, promote powder fluidization, fully release the energy stored in CaO, improve heat exchange performance, improve heat transfer coefficient, and promote the absorption of CaO reaction heat and powder sensible heat. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 The schematic diagram of the calcium-based reaction heat extraction device of Example 1 is shown in

[0046] The reference signs are as follows:

[0047] 1-CaO reactor; 2-settler; 3-heat recovery device; 4-CaO silo; 5-CaO feeding structure; 6-fan; 7-steam drum; 8-alkali liquid pool;

[0048] 101-first boiler tube; 102-first superheated heat exchanger; 201-second boiler tube; 202-first water cooling coil; 301-third boiler tube; 302-second water cooling coil. DETAILED DESCRIPTION

[0049] The present application will be further described by way of examples, but the present application is not limited to the examples. The experimental methods in the following examples are not specified, and are selected according to conventional methods and conditions or according to the instructions of the goods.

[0050] Example 1

[0051] The schematic diagram of the calcium-based reaction heat extraction device of Example 1 is shown in Figure 1As shown, it sequentially comprises a CaO preparer, a CaO reactor 1, a settler 2 and a heat recovery device 3;

[0052] The CaO preparer sequentially comprises a CaO feeding structure, a CaO processing structure, a CaO bin 4 and a CaO feeding structure 5; the CaO feeding structure is used for conveying CaO to be processed into the CaO processing structure, the CaO processing structure is used for processing CaO and conveying to the CaO bin 4, the CaO bin 4 is used for storing CaO; the CaO feeding structure 5 is connected with the reactor inlet of the CaO reactor 1, and the reactor inlet is arranged at the bottom of the CaO reactor 1; the CaO feeding structure 5 is a pneumatic conveying structure;

[0053] The inside of the CaO reactor 1 is provided with a reaction zone, a first boiler furnace tube 101 and a first superheating heat exchanger 102; the first superheating heat exchanger 102 is arranged at one side of the reaction zone, and the distance between the center of the first superheating heat exchanger 102 and the top of the CaO reactor 1 accounts for 30% of the height of the CaO reactor 1; the reaction zone is used for reacting CaO and reaction gas and releasing heat to convert boiler feed water in the first boiler furnace tube 101 into saturated steam; the first superheating heat exchanger 102 is used for converting saturated steam in the first boiler furnace tube 101 into superheated steam; the bottom of the CaO reactor 1 is provided with a first fluidization gas inlet; the top of the CaO reactor 1 is provided with a reactor outlet; the first boiler furnace tube 101 is arranged in a membrane water cooling wall mode, and the specification of the water cooling wall tube in the membrane water cooling wall mode is ᵠ51 (the nominal diameter is 51 mm); the first boiler furnace tube 101 is a finned tube; the first superheating heat exchanger 102 is provided with heat exchange tubes, the heat exchange tubes are light tubes, and the heat exchange tubes are arranged in a serpentine mode; the specification of the serpentine heat exchange tube is ᵠ76 (the nominal diameter is 76 mm);

[0054] The top of the settler 2 is provided with a settler inlet, the settler inlet is communicated with the reactor outlet, and the settler inlet is used for conveying materials reacted in the reaction zone to the settler 2; the inside of the settler 2 is provided with a settling zone, a second boiler furnace tube 201 and a first water cooling coil 202; the settling zone is used for further reacting unreacted materials and releasing heat to convert boiler feed water in the second boiler furnace tube 201 into saturated steam; the water cooling coil is arranged downstream of the settling zone; the bottom of the settler 2 is provided with a second fluidization gas inlet; the top of the settler 2 is provided with a settler outlet; the first water cooling coil 202 is arranged in a serpentine mode, and the specification of the serpentine first water cooling coil is ᵠ32 (the nominal diameter is 32 mm); the first water cooling coil 202 is a finned tube; the second boiler furnace tube 201 is arranged in a membrane water cooling wall mode, and the specification of the water cooling wall tube in the membrane water cooling wall mode is ᵠ51 (the nominal diameter is 51 mm); the second boiler furnace tube 201 is a finned tube; and the inside of the settler is not provided with a superheating heat exchanger;

[0055] The top of the heat recovery device 3 is provided with a heat recovery inlet, which is communicated with the settler outlet, and is used to transport the reacted material in the settling zone to the heat recovery device 3; the inside of the heat recovery device 3 is provided with a third boiler tube 301 and a second water cooling coil 302; the second water cooling coil 302 is arranged in a serpentine shape, and the specification of the serpentine second water cooling coil is ᵠ32 (the nominal diameter is 32 mm); the second water cooling coil 302 is a finned tube; the third boiler tube 301 is arranged in a membrane water cooling wall type, and the specification of the water cooling wall tube of the membrane water cooling wall type is ᵠ51 (the nominal diameter is 51 mm); the third boiler tube 301 is a finned tube; the sidewall of the bottom of the heat recovery device 3 is provided with a fluidized gas outlet, which is respectively communicated with the first fluidized gas inlet and the second fluidized gas inlet; a fan 6 is arranged on the pipeline communicated with the first fluidized gas inlet and the second fluidized gas inlet, and is used to recycle the fluidized gas; the first fluidized gas inlet includes three gas inlet units, each of which is connected with the fluidized gas outlet; the center of each gas inlet unit is vertically away from the axis of the CaO reactor 1 by an equal distance; the second fluidized gas inlet includes three gas inlet units, each of which is connected with the fluidized gas outlet; the center of each gas inlet unit is vertically away from the axis of the CaO reactor 1 by an equal distance.

[0056] The calcium-based reaction heat extraction device further comprises a steam drum 7, which is connected with the first boiler tube 101, the second boiler tube 201, the third boiler tube 301, the first water cooling coil 202 and the second water cooling coil 302 respectively.

[0057] The calcium-based reaction heat extraction device further comprises a boiler feed water module, which is connected with the first water cooling coil 202 and the second water cooling coil 302 respectively.

[0058] The calcium-based reaction heat extraction device further comprises a lye pool 8, which is used to receive the waste discharged from the settler 2 and the heat recovery device 3.

[0059] Example 2

[0060] Example 2 adopts the calcium-based reaction heat extraction device of Example 1, and the specific process is as follows:

[0061] The CaO powder with a temperature of 40℃ and a flow rate of 8.8t / h is sent into the CaO reactor through the CaO bin and the CaO feeding structure, reacts with the fluidized gas entering through the first fluidized gas inlet in the reaction zone of the CaO reactor, the fluidized gas is steam, the reaction temperature is 450℃, the reaction equation is CaO+H2O=Ca(OH)2, the reaction is an exothermic reaction, and 1930kw of heat is released, which is absorbed by the first boiler tube and the first superheated heat exchanger;

[0062] The fluidized gas carries the CaO and Ca(OH)2 powder into the settling device, in the settling zone, the unreacted CaO further reacts with steam, the reaction heat and the sensible heat of the CaO / Ca(OH)2 powder release 875kw heat, which is absorbed by the second boiler pipe and the first water cooling coil inside the settling device; the Ca(OH)2 powder after releasing the sensible heat is reduced from 450℃ to 200℃, and is sent into the lye tank through the bottom discharge system of the settling device for collection;

[0063] The fluidized gas carries a small amount of Ca(OH)2 powder into the heat recovery device, the temperature of the fluidized gas and the Ca(OH)2 powder at the inlet of the heat recovery device is 450℃, which is reduced to 200℃ inside the heat recovery device, and releases 190kw heat, which is absorbed by the third boiler pipe and the second water cooling coil; the Ca(OH)2 powder is sent into the lye tank through the bottom discharge system of the heat recovery device for collection.

[0064] In the calcium-based reaction heat extraction device, the CaO reaction heat and the powder sensible heat are 2995kw, which is used to produce 5.05t / h, 165℃ superheated steam, the system working condition adjustment range is 70%-110% of the rated working condition, the Ca(OH)2 powder generated by the reaction is about 11t / h, which is collected and transported through the lye tank. Compared with the traditional equipment, the heat recovery rate of the calcium-based reaction heat extraction device is high.

Claims

1. A calcium-based reaction heat removal device, characterized by, The CaO reactor, the settler and the heat recovery device are sequentially arranged. The CaO reactor is internally provided with a reaction zone, a first boiler tube and a first superheated heat exchanger; the reaction zone is used for reacting CaO and reaction gas and releasing heat, so that boiler feed water in the first boiler tube is converted into saturated steam; the first superheated heat exchanger is used for converting the saturated steam in the first boiler tube into superheated steam; the bottom of the CaO reactor is provided with a first fluidization gas inlet; and the top of the CaO reactor is provided with a reactor outlet. The top of the settler is provided with a settler inlet, which is communicated with the reactor outlet and used for conveying the material reacted in the reaction zone to the settler; the inside of the settler is provided with a settling zone, a second boiler tube and a first water-cooled coil; the settling zone is used for further reacting the unreacted material and releasing heat, so that boiler feed water in the second boiler tube is converted into saturated steam; the water-cooled coil is arranged downstream of the settling zone; the bottom of the settler is provided with a second fluidization gas inlet; and the top of the settler is provided with a settler outlet. The top of the heat recovery device is provided with a heat recovery device inlet, which is communicated with the settler outlet and used for conveying the material reacted in the settling zone to the heat recovery device; the inside of the heat recovery device is provided with a third boiler tube and a second water-cooled coil; the side wall of the bottom of the heat recovery device is provided with a fluidization gas outlet, which is respectively communicated with the first fluidization gas inlet and the second fluidization gas inlet.

2. The calcium-based reaction heat removal device of claim 1, wherein, The CaO reactor, the settler and the heat recovery device are sequentially arranged.

3. The calcium-based reaction heat removal device of claim 2, wherein, The CaO reactor, the settler and the heat recovery device are sequentially arranged.

4. The calcium-based reaction heat removal device of claim 1, wherein, The CaO reactor, the settler and the heat recovery device are sequentially arranged.

5. The calcium-based reaction heat removal device of claim 1, wherein, The CaO reactor, the settler and the heat recovery device are sequentially arranged.

6. The calcium-based reaction heat removal device of claim 1, wherein, The CaO reactor, the settler and the heat recovery device are sequentially arranged.

7. The calcium-based reaction heat removal device of claim 1, wherein, The CaO reactor, the settler and the heat recovery device are sequentially arranged.

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9. The calcium-based reaction heat removal device of claim 1, wherein, The calcium-based reaction heat-removal device satisfies one or more of the following conditions: (a) the first superheating heat exchanger is provided with heat exchange tubes, the heat exchange tubes are bare tubes or finned tubes, and the heat exchange tubes are in a spiral arrangement, a serpentine arrangement or a double-pipe arrangement; (b) the inside of the settler is provided with a second superheating heat exchanger, the second superheating heat exchanger is used to further heat the saturated steam generated in the second boiler tube; the second superheating heat exchanger is provided with heat exchange tubes, the heat exchange tubes are bare tubes or finned tubes, and the heat exchange tubes are in a spiral arrangement, a serpentine arrangement or a double-pipe arrangement; (c) the first fluidizing gas inlet includes 2-4 gas inlet units, each of the gas inlet units is connected to the fluidizing gas outlet; (d) the second fluidizing gas inlet includes 2-4 gas inlet units, each of the gas inlet units is connected to the fluidizing gas outlet.

10. The calcium-based reaction heat removal device of claim 9, wherein, The calcium-based reaction heat-removal device satisfies one or more of the following conditions: (a) in the first fluidizing gas inlet, the center of each of the gas inlet units is vertically equidistant from the axis of the CaO reactor; (b) in the second fluidizing gas inlet, the center of each of the gas inlet units is vertically equidistant from the axis of the CaO reactor.

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