Constant-pressure and constant-temperature heat exchange system

Abstract

The invention discloses a constant-pressure and constant-temperature heat exchange system. The constant-pressure and constant-temperature heat exchange system comprises a solid heat accumulator unit with a thermal insulation shell, an electric heating unit, a heat source heat exchange unit, a preheating heat exchanger unit, a booster water pump, a constant-pressure regulation and control unit, a user heat exchanger unit, a water supply unit and a heat user. According to the technical scheme, the electric heating unit and the heat source heat exchange unit are arranged in the solid heat accumulator unit with the thermal insulation shell, the heat outlet end of the heat source heat exchange unit is connected with a heat exchange inlet of the user heat exchanger unit through a hot water pipe, the hot water pipe subjected to heat exchange through the user heat exchanger unit serves as a water return pipe to communicate with the inlet end of the heat source heat exchange unit, and the constant pressure regulation and control unit and the booster water pump are further connected to the water return pipe in series to form a closed-loop circulating heat release structure; and water of the water supply unit enters the preheating heat exchanger unit on the water return pipe through a pipeline for heat exchange and then is directly connected with the heat user through the heat outlet of the user heat exchanger unit. The system pressure of exchange medium water is changed through the constant-pressure regulation and control unit, so that the boiling point of the water is changed.

Description

technical field [0001] The invention relates to the technical field of solid electric heat storage and heat exchange output, specifically, a device that uses cheap low-valley electric energy to heat solid heat storage materials for heat storage, and controls the pressure of the exothermic medium system to change the phase transition temperature for heat energy output A constant pressure and constant temperature heat exchange system. Background technique [0002] At present, it is a common way to use solid materials to provide heat energy by using low-valley electric heat storage, and it is also a common way for heat exchangers to use air as a heat exchange medium to absorb heat energy output from solid heat storage materials during heat release, but such The system is often a large power device and cannot maintain zero output state for a long time, which is not suitable for low power users and intermittent output use state. The application number applied by the applicant is...

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Problems solved by technology

In the patent of "Solid Electric Heat Storage System That Can Shut Off Heat Output", the method of controlling the amount of heat exchange medium water injected into the metal finned tube controls the heat energy output of the solid heat storage material to realize the opening or closing of the heat energy output of the equipment ;The heat exchanger containing the heat exchange medium water is a metal airtight cavity, and the internal pressure is generally standard atmospheric pressure at room temperature, that is, 0.1MPa. At this time, the saturated steam temperature in the metal finned tube is 100°C, because storage condensation The water heat exchanger is a tank with a fixed volume. The pressure in the heat exchanger cavity will increase with the temperature in the tank, and the saturated steam temperature in the metal finned tube will also increase with the increase in the pressure in the heat exchanger cavity. As a result, the temperature of the steam in the tank is higher than 100°C. When the hot water output changes from a large water flow rate to a small water flow rate, the saturated steam in the heat exchanger cavity above 100°C cannot maintain a constant water temperature, and even appear The phenomenon that the output hot water is vaporized; sometimes because the heat exchanger cavity is filled with steam higher than 100°C, the temperature of the condensed water is above 90°C, and the circulation driver cannot use the cheap micro booster with a common working temperature below 60°C on the market. Circulation pumps must be specially designed to drive micro booster circulation pumps for high-temperature water, which brings difficulty in procurement and high prices

According to the above problems, a constant pressure and constant temperature heat exchange technology is proposed to solve the problem of users stably outputting hot water according to the set temperature

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