System for generating steam by using heat accumulator of calcium oxide

Abstract

The utility model relates to a system for generating steam by using a heat accumulator of calcium oxide, and belongs to the field of heat exchange systems. The calcium oxide heat exchange module is used for calcium oxide reaction heat release to generate heat exchange steam, and chemical energy is converted into heat energy; and the heat storage module comprises a heat storage main body, an electric heating rod and a second steam connecting pipe, the electric heating rod heats the heat storage main body, the second steam connecting pipe guides heat exchange steam into the heat storage main body and heats the heat storage main body, and conversion and storage of electric energy and chemical energy are achieved. The high-temperature heat storage body is used for heating incoming water of the steam pocket to generate high-grade steam, the high-grade steam is connected into the steam pocket and is pressurized and filtered to generate high-temperature and high-pressure steam, and the steam pocket is used for releasing surplus steam through a steam exhaust pipe. The heat storage module and the steam pocket are connected through a pipeline for incoming water circulation. The calcium oxide heat exchange module and the steam pocket are connected through a pipeline for reaction steam circulation, and system emission is reduced. Low-grade heat energy, chemical energy and valley electricity can be converted and stored, and cyclic utilization of energy is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of steam energy storage, in particular to a steam production system which utilizes the chemical energy of calcium oxide to store heat. Background Art

[0002] High-temperature and high-pressure steam is an important energy source in industrial production. It can be used for power generation, drying, heating, dragging, refrigeration, hot water supply, domestic heating, etc. It is cleaner than petrochemical resources. In addition, the utilization rate of valley electricity in the power grid is low, resulting in prominent waste in the power supply system. In addition, there are clean electricity such as photovoltaic power generation, wind power, and preheating power generation. Developing energy storage technology to store valley electricity and release it during peak power hours can save peak power consumption and save electricity costs for enterprises.

[0003] At present, the heat storage / heat storage technology on the market has experienced significant development and is being promoted and applied. For example, the molten salt heat accumulator heats the molten salt through high-temperature and high-pressure steam, stores the heat of the high-pressure steam, and / or uses valley electricity to heat the molten salt energy storage system, and then converts it into high-pressure steam when releasing heat, which is used to do external work, thereby realizing energy storage and conversion. However, there are still defects such as high operating costs, high technical safety requirements, and large footprint.

[0004] In addition, among the main heat storage methods such as sensible heat storage, latent heat storage and thermochemical energy storage, thermochemical energy storage has significant advantages such as high energy storage density, high reaction temperature and small long-term heat storage loss, which can effectively solve the conversion, storage and regeneration of electric energy. Utility Model Content

[0005] The utility model provides a steam production system using a heat storage body of calcium oxide. The system aims to utilize the heat released by calcium oxide when it meets water to convert chemical energy into thermal energy and store heat. The heat storage body then releases heat to generate high-temperature and high-pressure steam that can be reused, thereby providing a new application method for the conversion, storage and regeneration of chemical energy of calcium oxide.

[0006] The technical solution of the utility model is: a steam generation system using a heat storage body of calcium oxide, comprising:

[0007] The calcium oxide heat exchange module comprises a heat exchange body, a first steam connecting pipe, a first steam outlet pipe and a first steam receiving pipe, wherein calcium oxide is arranged in the heat exchange body, the first steam receiving pipe is used to connect reaction steam to the heat exchange body, the reaction steam contacts and reacts with calcium oxide to release heat energy, the first steam connecting pipe is used to connect low-temperature steam to the heat exchange body, the low-temperature steam exchanges heat in the heat exchange body to generate heat exchange steam, and the first steam outlet pipe is used to output heat exchange steam from the heat exchange body to the outside;

[0008] The heat storage module comprises a heat storage body, an electric heating rod, a second steam pipe, a second water pipe, a second steam outlet pipe and a second steam exhaust pipe, wherein the electric heating rod is inserted into the heat storage body and used to heat the heat storage body, the second steam pipe is connected to the first steam outlet pipe and used to introduce the heat exchange steam generated by the calcium oxide heat exchange module (100) and heat the heat storage body, the second steam exhaust pipe (206) is used to output the heat exchange steam after heat release from the heat storage body, the second water pipe is used to connect water to the heat storage body, the heat storage body is used to heat the water to generate high-quality steam, and the second steam outlet pipe is used to output the high-quality steam from the heat storage body;

[0009] Steam drum: includes a boiler drum, a third steam connecting pipe, a third steam outlet pipe, an exhaust pipe and a water outlet pipe. The third steam connecting pipe is connected to the second steam outlet pipe to introduce the high-grade steam generated by the heat storage module into the boiler drum. The third steam outlet pipe is used to output high-temperature and high-pressure steam from the boiler drum. The exhaust pipe is used to release surplus steam from the boiler drum. The water outlet pipe is connected to the second water inlet connecting pipe to provide water for the heat storage module, forming a circulation between the steam drum and the heat storage module.

[0010] As one of the preferred embodiments of the present application, the steam drum also includes an exhaust branch pipe, one end of which is connected to the exhaust pipe and the other end is connected to the first steam connecting pipe of the calcium oxide heat exchange module. A portion of the high-temperature steam discharged from the steam drum is connected to the calcium oxide heat exchange module via the exhaust branch pipe to participate in the exothermic reaction of calcium oxide, thereby forming a circulation between the steam drum and the calcium oxide heat exchange module.

[0011] As one of the preferred embodiments of the present application, a coil is arranged in the heat exchange body of the calcium oxide heat exchange module, one end of the coil is connected to the first steam connecting pipe, and the other end is connected to the first steam outlet pipe. A heating rod (the electric heating rod is energized to generate heat) is arranged in the heat exchange body to decompose the limestone and slaked lime, which are the exothermic reaction products of the calcium oxide, so as to regenerate the calcium oxide. There are one or more heat exchange bodies, and the multiple heat exchange bodies respectively have a first steam connecting pipe, a first steam outlet pipe and a first steam connecting pipe, and the multiple heat exchange bodies are connected in parallel.

[0012] As one of the preferred embodiments of the present application, the second exhaust pipe and the second steam outlet pipe of the thermal storage module are arranged at the top of the thermal storage body, and the second steam connecting pipe and the second water inlet connecting pipe are arranged at the bottom of the thermal storage body. The thermal storage body is one or more thermal storage units, and the plurality of thermal storage units respectively have an electric heating rod, a second steam connecting pipe, a second water inlet connecting pipe, a second steam outlet pipe and a second exhaust pipe.

[0013] As one of the preferred embodiments of the present application, it also includes a storage tank (to play an energy storage role and reduce system emissions), the exhaust pipe of the steam drum is connected to the storage tank, the second exhaust pipe of the heat storage module is connected to the storage tank, the storage tank has a fourth water inlet pipe, the fourth water inlet pipe is used to replenish the water condensation steam to the storage tank, the storage tank is used to store the surplus steam discharged from the steam drum and the low-temperature steam discharged from the heat storage module, and the water condensation steam is stored as condensed water. The stored condensed water is preferably returned to the steam drum through pressurized filtration, so as to realize the internal circulation of the system heat energy and reduce external emissions.

[0014] As one of the preferred embodiments of the present application, the storage tank has a fourth water outlet pipe, which is connected to the steam drum and is used to replenish water from the storage tank to the steam drum. A booster pipeline is provided on the connecting pipeline between the storage tank and the steam drum to boost the pressure of the reflux condensed water so that it can smoothly return to the steam drum.

[0015] Compared with the prior art, the utility model has the following advantages: the application provides a steam generation system using a heat storage body of calcium oxide, which is divided into a calcium oxide heat release part, a heat storage part and a heat release steam generation part according to its function. The specific implementation method is as follows:

[0016] The heat release part of calcium oxide utilizes the heat release of calcium oxide in contact with steam, and obtains heat exchange steam by exchanging heat with low-temperature steam.

[0017] Heat storage is the process of using the heat exchange steam generated by the calcium oxide heat exchange module to heat the heat storage body of the heat storage module. The heat storage body is provided with a heating rod. On the basis of the heating by the heat exchange steam, the heating rod is used (the heating rod is preferably operated during valley electricity) to further heat the heat storage body to a higher temperature, thereby realizing the conversion and storage of calcium oxide chemical energy and valley electricity.

[0018] Heat release and steam production is achieved by introducing incoming water into the heat storage body, which heats the incoming water to produce high-quality steam. The high-quality steam enters the steam drum and, after pressure filtration, provides high-temperature and high-pressure steam to the outside for external work: power generation, traction, heating, refrigeration, heat supply, hot water supply, etc.

[0019] In order to reduce system emissions, improve thermal energy utilization and steam quality, this application designs a water circulation between the heat storage module and the steam drum, a steam circulation between the steam drum and the calcium oxide heat exchange module, and a condensed water circulation between the storage tank and the steam drum. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is the overall structural diagram of the steam generation system using the heat storage body of calcium oxide in the embodiment of the utility model;

[0021] Figure 2 This is a structural diagram of the heat release and heat storage part of the calcium oxide in the system in the embodiment of the utility model;

[0022] Figure 3 This is a structural diagram of the storage tank part of the system in the embodiment of the utility model;

[0023] In the figure, a calcium oxide heat exchange module 100, a heat exchange body 101, a first steam connecting pipe 102, a first steam outlet pipe 103, a first steam connecting pipe 104, a heat storage module 200, a heat storage body 201, an electric heating rod 202, a second steam connecting pipe 203, a second water connecting pipe 204, a second steam outlet pipe 205, a second exhaust pipe 206, a steam drum 300, a boiler drum 301, a third steam connecting pipe 302, a third steam outlet pipe 303, an exhaust pipe 304, a water outlet pipe 305, an exhaust branch pipe 306, a storage tank 400, a fourth water connecting pipe 401, a fourth water outlet pipe 402, and a booster pipeline 500. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below in conjunction with the accompanying drawings. The embodiments are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention. The text description in this embodiment corresponds to the accompanying drawings, and the description of the orientation is also based on the description of the accompanying drawings. These description methods are all for better explaining the technical solutions listed in the embodiments, but should not be understood as limiting the scope of protection of the present invention.

[0025] The purpose of this embodiment is to introduce a thermal storage body steam generation system, which includes four parts:

[0026] The calcium oxide heat exchange module 100 includes a heat exchange body 101, a first steam pipe 102, a first steam outlet pipe 103 and a first steam receiving pipe 104. A coil is arranged inside the heat exchange body 101 to form a shell-and-tube heat exchange structure, and calcium oxide is arranged in the shell side. The first steam pipe 102 is used to connect low-temperature steam to the coil, and the first steam receiving pipe 104 is used to connect reaction steam (steam) to the shell side to react with calcium oxide. Calcium oxide reacts with water vapor and air in the reaction steam. The reaction releases chemical energy. The reaction products are limestone and slaked lime. The reaction heat heats the coil to obtain heat exchange steam (high-temperature steam), and the heat exchange steam is output from the first steam outlet pipe 103. In this embodiment, an electric heating rod is arranged inside the heat exchange body 101. The electric heating rod is used to heat the calcium oxide material, mainly used for decomposing the reaction products limestone and slaked lime to recover calcium oxide.

[0027] Thermal storage module 200: includes thermal storage body 201, electric heating rod 202, second steam pipe 203, second water pipe 204, second steam outlet pipe 205 and second steam exhaust pipe 206. Second steam exhaust pipe 206 and second steam outlet pipe 205 are arranged at the top of thermal storage body 201, and second steam pipe 203 and second water pipe 204 are arranged at the bottom of thermal storage body 201. Electric heating rod 202 is inserted into thermal storage body 201 to heat thermal storage body 201 to reach a higher temperature. Second steam pipe 203 is connected to first steam outlet pipe 103 to introduce heat exchange steam into and heat thermal storage body 201. Second steam exhaust pipe 206 is used to output heat exchange steam after heat release from thermal storage body 201. Second water pipe 204 is used to connect water to thermal storage body 201. High temperature thermal storage body heats water to generate high-quality steam. Second steam outlet pipe 205 is used to output high-quality steam from thermal storage body 201. The second exhaust pipe 206 of the heat storage module is connected to the storage tank 400 to store the heat exchange steam in the storage tank.

[0028] Steam drum 300: includes a boiler drum 301, a third steam pipe 302, a third steam outlet pipe 303, an exhaust pipe 304, a water outlet pipe 305 and an exhaust branch pipe 306. The third steam pipe 302 is connected to the second steam outlet pipe 205 to introduce the high-grade steam generated by the heat storage module into the boiler drum 301. The third steam outlet pipe 303 is used to output high-temperature and high-pressure steam from the boiler drum. The exhaust pipe 304 is used to release excess steam from the boiler drum to the storage tank 400, and a part of the excess steam is connected to the first steam receiving pipe 104 of the calcium oxide heat exchange module 100 through the exhaust branch pipe 306. The steam discharged from the steam drum is reconnected to the heat exchange body 101 through the heat exchanger for contact reaction with calcium oxide, forming a circulation between the steam drum 300 and the calcium oxide heat exchange module 100. The water outlet pipe 305 is connected to the second water inlet pipe 204 to provide water to the heat storage module 200, forming an inlet water circulation between the steam drum 300 and the heat storage module 200.

[0029] Storage tank 400: The storage tank is used to store the surplus steam discharged from the drum 300 and the heat exchange steam discharged from the second exhaust pipe 206 of the heat storage module 200. The storage tank 400 has a fourth water inlet pipe 401 and a fourth water outlet pipe 402. The fourth water inlet pipe 401 is used to add water to the storage tank 400 to cool the steam and condense the steam. The fourth water outlet pipe 402 is connected to the drum 300 and is used to return water from the storage tank 400 to the drum 300. A booster pipeline 500 is arranged on the pipeline of the fourth water outlet pipe 402.

[0030] Furthermore, there are one or more heat exchange bodies 101 , and the plurality of heat exchange bodies 101 respectively have a first steam connecting pipe 102 , a first steam outlet pipe 103 and a first steam receiving pipe 104 .

[0031] Furthermore, the heat storage body 201 is composed of a plurality of heat storage units, and the plurality of heat storage units respectively have an electric heating rod 202 , a second steam connecting pipe 203 , a second water connecting pipe 204 , a second steam outlet pipe 205 and a second steam exhaust pipe 206 .

[0032] The working principle of the above-mentioned thermal storage steam generation system using calcium oxide is as follows:

[0033] The calcium oxide heat exchange module performs a heat release function: it utilizes the heat released by the contact reaction between steam and calcium oxide, and the reaction heat heats the low-temperature steam into high-temperature steam.

[0034] The heat storage module performs the heat storage function: the high-temperature steam generated by the calcium oxide heat exchange module is used to heat the heat storage body, and on the basis of the heat exchange steam heating, the electric heating rod is further used to further heat the heat storage body to a higher temperature using valley electricity, thereby realizing the conversion and storage of chemical energy and valley electricity.

[0035] The heat storage module and the steam drum work together to release heat and produce steam: the steam drum provides water for the heat storage module, and the water is heated in the heat storage module to produce high-grade steam. The high-grade steam is input into the steam drum and is pressurized and filtered to produce high-temperature and high-pressure steam, which is used to do external work, including but not limited to power generation, driving, and drying.

[0036] The steam drum is connected to the storage tank through an exhaust pipe to guide the surplus steam in the steam drum into the storage tank; the heat storage module is connected to the storage tank through a second exhaust pipe to store the steam after heat release in the storage tank. The storage tank is connected to water to condense the steam, and the generated condensed water is pressurized and returned to the steam drum, reducing emissions from the system.

[0037] In addition to the above embodiments, the present invention also includes other implementation modes. Any technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the claims of the present invention.

Claims

1. A steam generation system using a heat storage body of calcium oxide, characterized in that: include: The calcium oxide heat exchange module (100) comprises a heat exchange body (101), a first steam connecting pipe (102), a first steam outlet pipe (103) and a first steam receiving pipe (104), wherein calcium oxide is arranged in the heat exchange body, the first steam receiving pipe (104) is used to connect reaction steam to the heat exchange body, the reaction steam contacts and reacts with calcium oxide to release heat energy, the first steam connecting pipe (102) is used to connect low-temperature steam to the heat exchange body, the low-temperature steam exchanges heat in the heat exchange body (101) to generate heat exchange steam, and the first steam outlet pipe (103) is used to output the heat exchange steam from the heat exchange body to the outside; The heat storage module (200) comprises a heat storage body (201), an electric heating rod (202), a second steam connecting pipe (203), a second water connecting pipe (204), a second steam outlet pipe (205) and a second steam exhaust pipe (206), wherein the electric heating rod (202) is inserted into the heat storage body for heating the heat storage body, the second steam connecting pipe (203) is connected to the first steam outlet pipe (103) for introducing the heat exchange steam generated by the calcium oxide heat exchange module (100) into and heating the heat storage body (201), the second steam exhaust pipe (206) is used to output the heat exchange steam after heat release from the heat storage body, the second water connecting pipe (204) is used to connect water to the heat storage body, the heat storage body (201) is used to heat the water to generate high-quality steam, and the second steam outlet pipe (205) is used to output the high-quality steam from the heat storage body; The steam drum (300) comprises a boiler drum (301), a third steam connecting pipe (302), a third steam outlet pipe (303), an exhaust pipe (304) and a water outlet pipe (305). The third steam connecting pipe (302) is connected to the second steam outlet pipe (205) for introducing high-quality steam generated by the heat storage module into the boiler drum (301). The third steam outlet pipe (303) is used to output high-temperature and high-pressure steam from the boiler drum. The exhaust pipe (304) is used to release surplus steam from the boiler drum. The water outlet pipe (305) is connected to the second water inlet connecting pipe (204) for providing water to the heat storage module (200), thereby forming a circulation between the steam drum and the heat storage module.

2. The system according to claim 1, characterized in that: The steam drum (300) further comprises an exhaust branch pipe (306), one end of the exhaust branch pipe (306) being connected to the exhaust pipe (304) and the other end being connected to the first steam receiving pipe (104) of the calcium oxide heat exchange module, so as to form a circulation of reaction steam between the steam drum (300) and the calcium oxide heat exchange module.

3. The system according to claim 1, characterized in that: A coil is arranged in the heat exchange body (101) of the calcium oxide heat exchange module (100), one end of the coil is connected to a first steam connecting pipe (102), and the other end is connected to a first steam outlet pipe (103); a heating rod is arranged in the heat exchange body (101) for decomposing limestone and slaked lime, which are exothermic reaction products of calcium oxide; the heat exchange body (101) is one or more, and the plurality of heat exchange bodies respectively have a first steam connecting pipe (102), a first steam outlet pipe (103) and a first steam receiving pipe (104).

4. The system according to claim 1, characterized in that: The second steam exhaust pipe (206) and the second steam outlet pipe (205) of the heat storage module (200) are arranged at the top of the heat storage body, the second steam connecting pipe (203) and the second water inlet connecting pipe (204) are arranged at the bottom of the heat storage body, the heat storage body (201) is one or more heat storage units, and the plurality of heat storage units respectively have an electric heating rod (202), a second steam connecting pipe (203), a second water inlet connecting pipe (204), a second steam outlet pipe (205) and a second steam exhaust pipe (206).

5. The system according to claim 1, characterized in that: It also includes a storage tank (400), the exhaust pipe (304) of the steam drum (300) is connected to the storage tank (400), the second exhaust pipe (206) of the heat storage module (200) is connected to the storage tank (400), and the storage tank (400) has a fourth water inlet pipe (401), and the fourth water inlet pipe (401) is used to supplement the storage tank with water to condense steam.

6. The system according to claim 5, characterized in that: The storage tank (400) has a fourth water outlet pipe (402), and the fourth water outlet pipe (402) is connected to the steam drum (300) and is used to replenish water from the storage tank to the steam drum.

7. The system according to claim 6, characterized in that: A pressurizing pipeline (500) is provided on the connecting pipeline between the storage tank (400) and the steam drum (300).

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