RU101150U1 - WATER HEATING SYSTEM OF AN AUTONOMOUS COGENERATION INSTALLATION - Google Patents

Abstract

 1. The water heating system of an autonomous cogeneration unit, including a low-temperature heat exchanger for utilizing waste gas heat from a high-temperature recovery boiler with heating water supply and exhaust pipes and a heating flow supply gas pipe from a recovery boiler to a chimney between the low-temperature heat exchanger made in the form of a gas pipe located above the supply of the heating flow of the sealed chamber formed from the outside by a thermally insulated casing consisting of a shell with a top it and the lower covers, where the heated water supply pipe is located tangentially to its walls in the lower part of the chamber, and the water discharge pipe is located in the upper part of the camera, also tangentially to the walls and diametrically opposite to the water supply pipe, and a chimney located coaxially to the insulated casing, characterized in that a phase transition heat accumulator is installed, formed on the inner side by the outer wall of the chimney, and on the outside, by the shell aligned with it, which is the inner wall second low temperature heat exchanger, filled with heat accumulating material. ! 2. The water heating system of the autonomous cogeneration plant according to claim 1, characterized in that paraffin with a phase transition temperature of 60 ° C and a phase transition heat of 183 kJ / kg is used as a heat storage material.

Description

The solution relates to the field of power engineering - utilization of the heat of the exhaust gases of internal combustion engines (ICE), boilers and furnaces; it is intended for water heating in the conditions of various levels of heat consumption (hot water supply - hot water) of consumers.

During the hours of greatest consumption of hot water, its flow rate may exceed the average daily value by 2 ... 3 times // Designer Handbook. Internal sanitary devices, part 1 / Ed. I.G. Staroverova - M.: Stroyizdat, 1975, p. 176. To solve this problem, an additional heat-insulated hot water storage tank with a sufficiently large capacity is usually installed, where the heat carrier heated in heat exchangers is pumped during periods of least consumption, and from where it is then taken in during periods of peak loads. Water in the DHW system from the storage tanks, as a rule, is supplied automatically by pumps with controlled flow depending on the water intake.

As a prototype, a water heating system of an autonomous cogeneration unit, described by the RF patent for utility model No. 75454, F22B 33/18, publ. 08/10/2008. The system includes a low-temperature heat exchanger for utilizing waste gas heat from a high-temperature ICE recovery boiler with heating water inlet and outlet pipes and a heating flow supply gas pipeline. The low-temperature heat exchanger is made in the form of a sealed chamber located above the gas supply line for the heating flow, formed by the outer wall of the chimney and coaxially mounted with a heat-insulated casing, consisting of a shell with upper and lower covers, while the pipe for supplying heated water is tangential to its walls, and the water outlet pipe - in the upper part of the chamber, also tangentially to the walls and diametrically opposite to the water supply pipe.

The disadvantage of this system is that when the thermal mode of the engine is constant (the electric load of the cogeneration unit is constant), the supply of heat energy to the heated water is also constant, and during periods of increased water consumption, water heating may be insufficient for the needs of consumers (the required temperature is 60 ... 70 ° C)

This disadvantage is eliminated by the proposed solution.

The task at hand is to increase the efficiency and reliability of the operation of the DHW system.

EFFECT: additional possibility of accumulation of thermal energy during a period of reduced water consumption and its return during peak hours in a design with dimensions that are minimal for a cogeneration unit.

This technical result is achieved in that in a water heating system of an autonomous cogeneration unit, including a low-temperature heat exchanger for recovering heat of exhaust gases from a high-temperature heat recovery boiler of an internal combustion engine with nozzles for supplying and discharging heated water and a gas supply for supplying a heating stream from a heat recovery boiler to a chimney, between the low-temperature a heat exchanger made in the form of a sealed chamber located above the gas supply line for the heating flow, formed from the outside of the heat an insulated casing consisting of a shell with upper and lower covers, where the heated water supply pipe is located tangentially in the lower part of the chamber, and the water pipe in the upper part of the chamber, also tangentially to the walls and diametrically opposite the water supply pipe, and the chimney, located coaxially to the insulated casing, a phase transition heat accumulator (TAFP) is installed, formed on the inner side by the outer wall of the chimney, and on the outside, coaxially mounted on it echaykoy, which is the inner wall of the low temperature heat exchanger, filled with heat accumulating material (TAM), which serves as a paraffin phase transition temperature of 60 ° C and a heat of phase transition of 183 kJ / kg.

During operation of a cogeneration unit based on gas reciprocating units, the temperature of the exhaust gases after the recovery boiler at the inlet to the chimney is about 180 ° C (a further decrease in temperature leads to a significant increase in the overall dimensions of the unit).

TAPP allows you to effectively remove heat from the chimney, save it, and with increased water consumption of hot water, give additional thermal energy to the phase transition to heat the water to the desired temperature.

The proposed design of a water heating system with TAPP is shown in figure 1, figure 2 is a top view. The water heating system includes a low-temperature heat exchanger 1 for utilizing waste gas heat from a high-temperature recovery boiler (for example, steam). The heat exchanger 1 is made in the form of a sealed chamber located above the gas pipe 2 for supplying a heating stream from a high-temperature boiler to a chimney 3. The heat exchanger 1 is equipped with a pipe 4 for supplying heated water, which is located tangentially in the chamber at the bottom of the chamber. The chamber has a heat-insulated (for example, polyurethane foam) casing 5, consisting of a steel shell mounted coaxially to the chimney, with the top 6 and bottom 7 ring covers welded to the chimney and casing shell. The heated water outlet pipe 8 is also located tangentially to the walls in the upper part of the chamber and is diametrically opposite to the pipe 4. To remove condensate from the chimney, a drain pipe 9 is made in its lower part. TAM 11 and heat exchanger 1 with heated water 12.

The water heating system operates as follows. The waste gases of the heating stream from the recovery boiler through the gas pipe 2 enter the chimney 3, heat its wall, heat it and melt TAM in the cavity 11, heat the shell 10. The heated water flows under overpressure into the heat exchanger 1, the water stream 12 is twisted inside chamber moves up, from the wall of the shell 10 heats up and is diverted tangentially through the pipe 8 into the hot water supply network. When working with reduced water consumption (domestic hot water consumption), TAM is in the liquid phase, with increased water consumption, TAM gradually becomes solid, and additional heat of phase transition is released, which allows maintaining the temperature of the heated water at the right level for the required time. With a decrease in water consumption, TAM again goes into a liquid state, accumulating thermal energy, both capacitive and phase transition.

The proposed design of a water heating system is characterized by reduced overall dimensions and lower losses from external cooling of the insulation of surfaces.

Claims (2)

1. The water heating system of an autonomous cogeneration unit, including a low-temperature heat exchanger for utilizing waste gas heat from a high-temperature recovery boiler with heating water supply and exhaust pipes and a heating flow supply gas pipe from a recovery boiler to a chimney between the low-temperature heat exchanger made in the form of a gas pipe located above the supply of the heating flow of the sealed chamber formed from the outside by a thermally insulated casing consisting of a shell with a top it and the lower covers, where the heated water supply pipe is located tangentially to its walls in the lower part of the chamber, and the water discharge pipe is located in the upper part of the camera, also tangentially to the walls and diametrically opposite to the water supply pipe, and a chimney located coaxially to the insulated casing, characterized in that a phase transition heat accumulator is installed, formed on the inner side by the outer wall of the chimney, and on the outside, by the shell aligned with it, which is the inner wall second low temperature heat exchanger, filled with heat accumulating material. 2. The water heating system of the autonomous cogeneration unit according to claim 1, characterized in that paraffin with a phase transition temperature of 60 ° C and a phase transition heat of 183 kJ / kg is used as a heat storage material.