Steam heat storage system based on hydroxide thermochemical heat storage

Abstract

The utility model discloses a steam heat storage system based on hydroxide thermochemical heat storage. The steam heat storage system comprises a thermochemical heat storage device, a heat storage water tank and a water feeding pump. According to the system, the thermal chemical heat storage device based on the hydroxide heat storage material is heated through steam, heat is released in the heat using peak, and the steam heat released in the chemical reaction in the heat storage process is completely recovered through cascade heat storage. The system has the beneficial effects of simple system, high efficiency, high heat storage density of the heat storage material, no solidification risk, no toxicity, high economical efficiency and safety and the like.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of heat storage, especially relates to a steam heat storage system based on hydroxide thermochemical heat storage. BACKGROUND

[0002] In the field of heat utilization, the heat load of users is fluctuant and intermittent due to process requirements or working time, etc., and boilers need to frequently adjust peak loads, which greatly affects the service life and economy of the boilers. In order to overcome this problem, the research and development of low-cost large-scale heat storage technology is also increasingly important. At the same time, the grade of electric energy is higher than that of heat energy, and using steam to heat heat storage materials is a more economical technical route.

[0003] For steam heat storage, high-temperature and high-pressure heat storage water tanks and molten salt heat storage are generally used at present. When the steam parameters are high, the design pressure and temperature of the tank body of the heat storage water tank are high, and the wall thickness is large. At the same time, the heat storage density of the wet heat material is generally low, and the volume of the storage tank is large under the same heat storage density, and the cost is very high. For molten salt heat storage, the solidification temperature of the molten salt is high, and a complex preheating system and anti-solidification protection system need to be designed to prevent the molten salt from solidifying and blocking the pipeline. UTILITY MODEL CONTENT

[0004] The utility model discloses a steam heat storage system based on hydroxide thermochemical heat storage.

[0005] The utility model discloses a steam heat storage system based on hydroxide thermochemical heat storage, including thermochemical heat storage device, heat storage water tank and feed water pump, the thermochemical heat storage device includes inlet and outlet water, first steam outlet, heat release steam inlet and heat storage steam outlet, the heat storage water tank includes first water outlet, first water inlet and steam inlet, the feed water pump includes second water outlet and second water inlet, the thermochemical heat storage device's inlet and outlet water are connected with the second water outlet of feed water pump, and are connected with the first water inlet of heat storage water tank through first channel, the first steam outlet of thermochemical heat storage device is connected with the gas supply main pipe through third channel and fourth channel respectively, and is connected with heat release steam inlet through fifth channel, the heat storage steam outlet of thermochemical heat storage device is connected with the steam inlet of heat storage water tank through second channel, the first water outlet of heat storage water tank is connected with the second water inlet of feed water pump, be provided with third valve on the first channel, be provided with second valve on the third channel, be provided with first valve on the fourth channel, be provided with fourth valve on the fifth channel, the inside storage of thermochemical heat storage device has heat storage material.

[0006] Further, the heat storage material is hydroxide.

[0007] Further, the thermochemical heat storage device further comprises finned heat exchange pipes.

[0008] Further, the heat storage medium inside the heat storage tank is water.

[0009] The steam heat storage system based on hydroxide thermochemical heat storage has high heat storage density (the maximum heat storage density is above 1000 kJ / kg), the thermochemical heat storage equipment is nearly constant pressure, and the cost of the equipment shell is low. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 It is a structure diagram of the steam heat storage system based on hydroxide thermochemical heat storage.

[0011] In the figure, 1 is a thermochemical heat storage device, 2 is a heat storage tank, 3 is a feed water pump, 4 is a first valve, 5 is a second valve, 6 is a third valve, 7 is a first pipeline, 8 is a second pipeline, 9 is a fourth valve, 10 is a third channel, 11 is a fourth channel, 12 is a gas supply main pipe, 13 is a fifth channel, 14 is an inlet and outlet water port, 15 is a first steam outlet, 16 is a heat release steam inlet, 17 is a heat storage steam outlet, 18 is a first water outlet, 19 is a first water inlet, 20 is a steam inlet, 21 is a second water outlet, and 22 is a second water inlet. DETAILED DESCRIPTION

[0012] In order to make the purpose, technical scheme and advantages of the utility model more clear and clear, combining with the drawings and examples, the utility model is further described in detail, and it should be understood that the specific examples described here are only used to explain the utility model, rather than all examples. Based on the examples in the utility model, all other examples obtained by those skilled in the art without creative labor are within the protection scope of the utility model.

[0013] For example, the steam heat storage system based on hydroxide thermochemical heat storage has the advantages of high heat storage density, small harm, simple system, etc. Figure 1The utility model provides a kind of steam heat storage system based on hydroxide thermochemical heat storage, including thermochemical heat storage device 1, heat storage water tank 2 and feed water pump 3;The thermochemical heat storage device 1 includes inlet and outlet water port 14, first steam outlet 15, heat-releasing steam inlet 16 and heat storage steam outlet 17;The heat storage water tank 2 includes first water outlet 18, first water inlet 19 and steam inlet 20;The feed water pump 3 includes second water outlet 21 and second water inlet 22;The inlet and outlet water port 14 of thermochemical heat storage device 1 is connected with the second water outlet 21 of feed water pump 3, and is connected with the first water inlet 19 of heat storage water tank 2 by first channel 7;The first steam outlet 15 of thermochemical heat storage device 1 is connected with gas supply main pipe 12 by third channel 10 and fourth channel 11 respectively, and is connected with heat-releasing steam inlet 16 by fifth channel 13;The heat storage steam outlet 17 of thermochemical heat storage device 1 is connected with the steam inlet 20 of heat storage water tank 2 by second channel 8;The first water outlet 18 of heat storage water tank 2 is connected with the second water inlet 22 of feed water pump 3;Third valve 6 is provided on the first channel 7;Second valve 5 is provided on the third channel 10;First valve 4 is provided on the fourth channel 11;Fourth valve 9 is provided on the fifth channel 13;Thermochemical heat storage device 1 stores heat storage material in the interior.

[0014] Specific working process is: when steam low valley heat storage, open second valve 5 and third valve 6, close first valve 4 and fourth valve 9, and the excess steam passes through gas supply main pipe 12, then enters thermochemical heat storage device 1 from first steam outlet 15 by third channel 10, uses steam to heat thermochemical heat storage device 1, and steam is endothermic by heat storage material in the interior of thermochemical heat storage device 1, generates high-temperature water and releases high-temperature steam;High-temperature steam is discharged from heat storage steam outlet 17 and enters heat storage water tank 2 by second channel 8;High-temperature water is output from inlet and outlet water port 14 and enters heat storage water tank 2 by first channel 7;The heat of steam is completely stored in heat storage water tank 2 when heat storage.

[0015] When steam high peak heat-releasing, open first valve 4 and fourth valve 9, close second valve 5 and third valve 6, and the heat storage water of heat storage water tank 2 is output from first water outlet 18 and enters feed water pump 3 from second water inlet 22, then is output from second water outlet 21 and enters thermochemical heat storage device 1 from inlet and outlet water port 14;Heat water is sensible heat exchange in thermochemical heat storage device 1, and becomes steam after heat exchange;Steam is discharged from first steam outlet 15, a small part of steam enters thermochemical heat storage device 1 from heat-releasing steam inlet 16 by fifth channel 13, and carries out chemical reaction with heat storage material in the interior of thermochemical heat storage device 1, releases heat, then adjusts the opening of fourth valve 9 to control heat load;Most steam enters gas supply main pipe 12 by fourth channel 11 to supplement steam.

[0016] In the embodiment, the heat chemical storage device 1 is internally provided with fin heat exchange pipes, the heat storage material is integrally modularly designed with the heat exchange pipes, and heat exchange is strengthened.

[0017] In the embodiment, the heat storage material is hydroxide, which can be Ca(OH)2, Sr(OH)2, Mg(OH)2 or Ba(OH)2, and the material can be decomposed into water and other reactants under heating. The decomposition temperature of the hydroxide is between 100-500 DEG C.

[0018] The reaction between water vapor and metal oxide is mainly used to store and release heat.

[0019] The chemical reaction principle is as follows:

[0020] In the embodiment, the water vapor heated in the heat storage process is stored in the heat chemical storage device 1 to store high-grade heat value and stored in the heat storage tank to store low-grade heat value, and all the heat values are recovered.

[0021] In the embodiment, the water vapor waste heat released in the heat storage process is recovered by directly mixing with water in the heat storage tank 2 to recover all the heat.

[0022] In the embodiment, the heat storage medium in the heat storage tank 2 is water, the steam is injected into the tank to directly mix with water to exchange heat, and all the waste heat in the heat storage process is recovered.

[0023] The above only describes the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection range of the utility model.

Claims

1. A steam thermal storage system based on hydroxide thermochemical thermal storage, characterized in that, The system includes a thermochemical thermal storage device (1), a hot water storage tank (2), and a water pump (3); the thermochemical thermal storage device (1) includes an inlet / outlet (14), a first steam outlet (15), a heat release steam inlet (16), and a thermal storage exhaust steam outlet (17); the hot water storage tank (2) includes a first outlet (18), a first inlet (19), and a steam inlet (20); the water pump (3) includes a second outlet (21) and a second inlet (22); the inlet / outlet (14) of the thermochemical thermal storage device (1) is connected to the second outlet (21) of the water pump (3), and is connected to the first inlet (19) of the hot water storage tank (2) through a first channel (7); the first steam outlet (15) of the thermochemical thermal storage device (1) is connected to the third... Channel (10) and the fourth channel (11) are connected to the gas supply main pipe (12) and are connected to the heat release steam inlet (16) through the fifth channel (13); the heat storage exhaust port (17) of the thermochemical heat storage device (1) is connected to the steam inlet (20) of the hot water storage tank (2) through the second channel (8); the first outlet (18) of the hot water storage tank (2) is connected to the second inlet (22) of the water supply pump (3); a third valve (6) is provided on the first channel (7); a second valve (5) is provided on the third channel (10); a first valve (4) is provided on the fourth channel (11); a fourth valve (9) is provided on the fifth channel (13); the thermochemical heat storage device (1) stores heat storage material inside.

2. The steam thermal storage system based on hydroxide thermochemical thermal storage according to claim 1, characterized in that, The heat storage material is a hydroxide.

3. A steam thermal storage system based on hydroxide thermochemical thermal storage according to claim 1, characterized in that, The thermochemical heat storage device (1) is also equipped with finned heat exchange tubes inside.

4. A steam thermal storage system based on hydroxide thermochemical thermal storage according to claim 1, characterized in that, The heat storage medium inside the hot water storage tank (2) is water.

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