KR100424899B1 - Closed circuit hot water boiler system with steam generator - Google Patents

Abstract

The present invention relates to a steam generator of a closed-circuit hot water boiler system that generates steam by reheating hot water heated in a heat exchanger connected to a hot water boiler, and improves the structure of the hot water boiler without having to purchase a separate steam boiler. To get steam.

To this end, the branch pipe 14 connected to the hot water supply pipe 13, the electromagnetic valve 15 is installed on the branch pipe to open and close the pipe of the branch pipe, and installed on the branch pipe to force hot water in conjunction with the electromagnetic valve Pressure sensor 16 to pressurize, and the temperature sensor 18 is installed in the stack 17, the exhaust gas is discharged to drive the electromagnetic valve and the pressure pump in accordance with the sensed that the exhaust gas is a set temperature, and at one end of the branch pipe The hot water heater 19 is connected to pass through the stack 17 so that the hot water is first heated by the waste heat passing through the stack, and is connected to one end of the hot water heater and positioned in the boiler fire chamber 7a. Scale separation tank for separating the scale contained in the steam by installing a superheater 20 to make the first heated steam to the saturated steam in the hot water heater and the pipe 21 connected to the superheater to reduce the pressure of the steam ( 22) with icon A steam supply pipe 23 connected to the outlet side of the scale separation tank and supplying steam to a heat exchanger and a steam using device, a steam recovery pipe 32 connected between the steam supply pipe and a cold water supply pipe, and installed on the steam recovery pipe The pressure sensor 33 is composed of an electronic valve 34 that opens and closes the flow path as it senses the set pressure of steam, and a check valve 35 installed on the steam recovery pipe to prevent cold water from flowing back to the steam supply pipe. .

Description

Closed circuit hot water boiler system with steam generator

The present invention relates to a closed-circuit hot water boiler system for heating by heating water, and more specifically, to generating steam by reheating hot water heated in a heat exchanger connected to a hot water boiler to generate steam. Relates to a device.

In general, high-pressure steam obtained by heating water is widely used in various fields such as a laundry, a sewing factory, a kitchen, and the like, and such steam is usually obtained by a steam boiler.

1 is a perspective view showing the internal structure of a conventional steam boiler, Figure 2 is a longitudinal cross-sectional view of Figure 1, the through-hole is formed in the center of the cylindrical water tank (1), the side is opened and the lower one side of the water in the water tank Inlet pipe (1a) for supplying is connected.

In the circumferentially spaced spaced portion of the upper portion of the water tank 1, a connecting pipe 2 having a predetermined diameter is connected to the water tank, and a cylindrical steam chamber 3 is formed on the upper portion of the connecting pipe. It is provided with one side of the steam chamber is connected to the steam discharge pipe (3a).

In addition, one side of the combustion chamber 5 is provided at the center of the steam chamber 3 and is provided with a combustion gas exhaust pipe 4 communicating with the outside of the apparatus and a space under the steam chamber, and is formed to pass through the central one side of the water tank 1. The burner 6 is provided in the opening, and the outer portion of the structure is surrounded by the insulated outer body.

The steam boiler having such a structure can obtain steam by igniting the burner 6 in a state where water is filled up to a predetermined position of the water tank 1 and the connection pipe 2.

That is, when combustion is performed while the flame is ejected into the combustion chamber 5 by ignition of the burner 6, the combustion heat is directly transmitted to the water tank 1 and the connection pipe 2 filled with water, and thus the water starts to be heated.

The combustion gas generated in the above operation is discharged to the outside through the exhaust pipe 4 installed to penetrate the center of the steam chamber 3.

When the water filled in the water tank 1 and the connecting pipe 2 by the burner 6 is continuously heated to generate steam, the generated steam is transferred to the steam chamber 3 installed in communication with the upper part of the connecting pipe 2. Filled while maintaining a proper pressure, the filled steam is discharged through the steam outlet (3a) by opening the on-off valve (not shown) can be used according to the application.

Accordingly, in order to obtain high-pressure steam, an expensive steam boiler must be separately purchased, resulting in an economic burden, and a steam boiler and hot water boiler must be operated at the same time for steam generation and heating. there was.

In addition, since the hot exhaust gas after heating the water tank (1) and the connecting pipe (2) in order to obtain steam is discharged to the outside through the exhaust pipe (4), the thermal efficiency is extremely reduced and the amount of fuel used is also increased. there was.

The present invention has been made to solve such a conventional problem, it is an object to improve the structure of the hot water boiler to obtain a high-pressure steam without purchasing a separate steam boiler.

Another object of the present invention is to improve the efficiency of the boiler in using the existing heating hot water boiler and hot water heat exchanger for hot water supply, as well as to prevent the occurrence of scale that causes corrosion of the boiler.

According to an aspect of the present invention for achieving the above object, a heat exchanger with a burner, which is a heat source, a boiler for heating water by a heat source of the burner, and water cooled by hot water heated in a boiler by piping to the boiler. A heat exchanger for heating the feed water, a cold water supply pipe and a hot water supply pipe connected to the heat exchanger, a recovery pipe for resupplying the cold water heat exchanged in the heat exchanger to the boiler side, and the cold water installed on the recovery pipe. A closed circuit hot water boiler system composed of a forced pumping circulation pump, comprising: a branch pipe connected to the hot water supply pipe, an electromagnetic valve installed on the branch pipe to open and close a pipeline of the branch pipe, and interlocked with the electronic valve installed on the branch pipe. Pressure pump to forcibly pressurize the hot water, and the exhaust gas is set in the stack where the exhaust gas is discharged. A temperature sensor for driving the electronic valve and the pressure pump according to the degree of induction, a hot water heater connected to one end of the branch pipe through the stack to allow the hot water to be primarily heated by the waste heat passing through the stack, and the hot water is Superheater connected to one end of the heat and positioned in the firebox of the boiler to make the first heated steam to saturated steam in the hot water heater, and installed on the pipe connected to the superheater to reduce the pressure of the steam contained in the steam A scale separation tank for separating the scale, a steam supply pipe connected to an outlet side of the scale separation tank and supplying steam to a heat exchanger and a steam using device, a steam recovery pipe connected between the steam supply pipe and a cold water supply pipe, The electronic valve for opening and closing the flow path as the pressure sensor installed on the steam recovery pipe senses the set pressure of the steam, and the steam recovery pipe The steam generator in a closed circuit hot water boiler system, characterized in that is provided consisting of a check valve for preventing back flow phenomenon that the naengsugwa steam supply pipe is provided.

1 is a perspective view showing the internal structure of a conventional steam boiler

2 is a longitudinal cross-sectional view of FIG.

3 is a schematic representation of an apparatus of the present invention

* Description of the symbols for the main parts of the drawings *

7: boiler 9: heat exchanger

13: hot water supply pipe 14: branch pipe

16, 30, 34: electromagnetic valve 18, 28: temperature sensor

19: hot water heater 20: superheater

21, 27: piping 22: scale separation tank

23: steam supply pipe 25, 26, 35: check valve

29: blowout pipe 32: steam recovery pipe

33: pressure sensor

Hereinafter, described in more detail with reference to Figure 3 showing the present invention as an embodiment.

3 is a schematic view showing the apparatus of the present invention, in which the closed-circuit hot water boiler system has the same structure as the closed-circuit circulation steam boiler system, which is pre- filed by the applicant and registered in Korean Patent No. 221493.

That is, the boiler (7) for heating the water by heating the burner to generate steam, the heat exchanger (9) for heat exchange as the steam generated by the boiler is supplied through the pipe (8), and the heat exchanger To drain the condensate generated in the condensate trap 10, a condensate recovery tank 11 containing the condensate generated by the heat exchange in the heat exchanger, a pump for forcibly conveying the condensate in the condensate recovery tank to the boiler side (12) and the like.

Meanwhile, a branch pipe 14 is connected to a hot water supply pipe 13 that is heated to a high temperature in the heat exchanger 9 to supply hot water to an air conditioner or a fan coil, and the branch valve 14 opens on the branch pipe. On the branch pipe 14 adjacent to the hot water supply pipe 13 is installed a pressure pump 16 for forcibly pressurizing the hot water from the hot water supply pipe 13 in conjunction with the electromagnetic valve.

The waste heat passing through the stack 17 at the other end of the branch pipe is installed in the stack 17 in which the exhaust gas is discharged, and detects that the exhaust gas is at a set temperature. The hot water heater 19 is connected to the hot water is heated by the primary heating and the other end of the hot water heater is installed in the fire chamber (7a) of the boiler to saturate the steam heated primarily in the hot water heater Superheater 20 is made to be connected.

In addition, the pipe 21 connected to the other end of the superheater 20 is provided with a scale separation tank 22 for separating the scale by lowering the pressure of steam, and on the discharge side of the scale separation tank, steam is applied to the heat exchanger and the steam equipment. The steam supply pipe 23 is connected to supply the on and off valve 24 for controlling the supply of steam is installed on the steam supply pipe.

In addition, a check valve 25 is provided on a pipe 21 connected between the superheater 20 and the scale separation tank 22, and a check valve (on the bottom surface of the scale separation tank 22 and on the pipe 21). Another pipe 27 provided with 26 is connected.

The temperature sensor 28 for detecting the steam temperature in the pipe is installed on the pipe 21, and the temperature of the condensed water is set on the extraction pipe 29 installed in communication with the pipe 21 according to the detection of the temperature sensor The electronic valve 30 is installed to open the conduit of the extraction pipe as it detects the lower one.

The check valves 25 and 26 provided on the pipes 21 and 27 control the flow of the fluid in opposite directions.

The reason is that when steam is supplied along the pipe 21 to the scale separation tank 22, the steam is not moved along the pipe 27 to the scale separation tank by the check valve 26 provided on the pipe 27. On the contrary, when discharging the scale accumulated in the scale separation tank 22, the condensed water does not escape through the pipe 21.

Meanwhile, a steam recovery pipe 32 is connected between the steam supply pipe 23 and the cold water supply pipe 31, and a pressure sensor 33 is installed on the steam recovery pipe to detect the pressure of steam. When the sensor detects that the steam pressure is higher than the set pressure, the electronic valve 34 for opening the steam recovery pipe to supply the high pressure steam to the cold water supply pipe 31 and the check valve 35 for preventing the reverse flow of cold water are installed. It is.

In the drawings, reference numeral 36 is a safety valve installed on the steam supply pipe 23 to protect the system by automatically discharging steam at a set pressure when a function of the system is malfunctioning or an abnormal phenomenon occurs.

Referring to the operation of the present invention configured as described above is as follows.

First, in the process of continuously heating the water according to the operation of the boiler 7 and supplying it to the heat exchanger 9 side, cold water is supplied to the cold water supply pipe 31 side connected to the heat exchanger and heated, and then discharged to the hot water supply pipe 13 side. The operation of operating the air conditioner and fan coil by the same is the same as the patent registration No. 221493 registered by the applicant, so the detailed description thereof is omitted and the process of producing steam using hot water discharged through the hot water supply pipe (13) Will be described only.

In the process of obtaining only hot water by using the general closed-loop hot water boiler system as described above, the empty pipe line without hot water or steam is maintained on a pipe for obtaining steam.

When the switch (not shown) is turned on to obtain steam in such a state, the temperature sensor 18 installed on the stack 17 detects the temperature of the exhaust gas so that the temperature of the exhaust gas is set to a temperature (about 100). Or more) and open the electronic valve 15 installed on the branch pipe 14, and simultaneously drive the pressurized pump 16. Therefore, a part of the hot water supplied to the air conditioner or the fan coil along the hot water supply pipe 13 is removed. Forced supply to the branch pipe 14 side starts.

When a part of the hot water is supplied to the hot water heater 19 side through the branch pipe 14 by the operation as described above through the stack 17 in the process of passing through the hot water heater 19 located in the stack 17 As the hot water is heated by the waste heat discharged to the outside, it gradually begins to change into steam.

When the hot water is gradually vaporized while passing through the hot water heater 19 and moved to the superheater 20 located in the firebox 7a, the hot water is heated again by the heat source of the burner, so that the wet steam is changed into a saturated steam and then the pipe 21 Is supplied through the inside of the scale separation tank 22, the steam supplied to the descaling tank side is a pressure drop according to the volume change, so that the fine scale contained in the steam free fall and accumulate on the bottom surface of the scale separation tank Therefore, only clean steam is supplied to the steam using device through the steam supply pipe (23).

At this time, the electronic valve 30 installed on the blowout pipe 29 connected to the pipe 21 is a temperature sensor 28 installed on the pipe 21 detects the steam higher than the set temperature, so that the blowout pipe 29 It is closing.

In addition, the high-temperature, high-pressure steam is supplied to the scale separation tank 22 through the check valve 25 and then discharged through the steam supply pipe 23 to connect the steam to the lowest surface of the scale separation tank 22. It does not flow back to the pipe 21 side via the 27.

This is because the flow path of the check valve 26 provided on the pipe 27 is opposite in direction to the check valve 25 provided on the pipe 21.

As described above, if the use of steam is temporarily stopped while the steam is continuously generated, the pressure pump 16 installed on the branch pipe 14 continues to be driven, so that the steam communicates with the steam recovery pipe 32. The steam pressure on the supply pipe 23 is increased.

When the steam pressure on the steam supply pipe 23 rises as described above and the pressure sensor 33 installed on the steam recovery pipe 32 detects that the set pressure is higher than the set pressure, the electronic valve 34 on the steam recovery pipe is opened. The high pressure steam is supplied to the cold water supply pipe 31 which is in communication with the steam recovery pipe to heat the cold water flowing into the heat exchanger 9 side, thereby maximizing thermal efficiency due to the generation of steam while the steam is not used. do.

On the other hand, when the temperature sensor 28 installed on the pipe 21 detects that the steam on the pipe condenses as the boiler stops, and the temperature of the condensate water reaches a set temperature (about 40 ° C.), the condensed water on the pipe is transferred to the outside. By discharging, it maintains an empty pipe state without hot water or steam on the pipe as in the initial state.

That is, when the temperature sensor 28 installed on the pipe 21 senses the set temperature, the electronic valve 30 installed on the outlet pipe 29 is opened, so that the condensed water on the pipe line is discharged to the outside through the outlet pipe 29. As described above, the scale accumulated in the scale separation tank 22 is discharged to the outside through the pipe 27 when the condensed water on the pipeline is discharged to the outside through the outlet pipe 29, the scale is caught on the pipeline. It won't be.

As such, after the condensate on the pipeline is completely discharged to the outside through the outlet pipe 29, the electronic valve 30 is restarted to close the outlet pipe 29, thereby maintaining an empty pipe state without hot water or steam on the pipe. will be.

As described above, the present invention has various advantages as follows.

First, since the hot water obtained from the heat exchanger is first heated by waste heat and then secondly heated by the heat source of the boiler to obtain steam, it is not necessary to have an expensive steam boiler to obtain steam. The economic burden can be solved and fuel costs can be reduced.

Second, when the hot water boiler is stopped, condensate on the pipeline is completely discharged, thus preventing the scale from being caught on the pipeline and thus obtaining clean steam.

Third, in the state in which the use of steam is temporarily stopped, the thermal efficiency is maximized because the cold water supplied to the inside of the heat exchanger is heated by using high temperature and high pressure steam.

Claims (3)

A burner that is a heat source, a boiler for heating water by the heat source of the burner, a heat exchanger connected to the boiler by a pipe, and heat exchanged with water cooled by hot water heated in the boiler to heat the supply water, and a heat exchanger connected to the heat exchanger. In the hot water boiler system comprising a cold water supply pipe and hot water supply pipe, a recovery pipe for resupplying the cold water heat exchanged in the heat exchanger to the boiler side, and a circulation pump for forcibly feeding the cold water installed on the recovery pipe, A branch pipe connected to the hot water supply pipe, an electronic valve installed on the branch pipe to open and close a pipeline of the branch pipe, a pressurized pump installed on the branch pipe to force hot water in conjunction with the electronic valve, and exhaust gas is discharged. A temperature sensor installed in the stack to drive the electronic valve and pressurized pump as it senses that the exhaust gas is at the set temperature. And a hot water heater connected to one end of the branch pipe to pass through the stack to allow the hot water to be primarily heated by the waste heat passing through the stack, and to be connected to one end of the hot water heater and positioned in the firebox of the boiler. A superheater installed in the hot water heater to make the first heated steam into a saturated steam, a scale separation tank installed on a pipe connected to the superheater to reduce the pressure of steam to separate the scale contained in the steam, and the scale separation. A steam supply pipe connected to the discharge side of the tank and supplying steam to the heat exchanger and the steam using device, a steam recovery pipe connected between the steam supply pipe and the cold water supply pipe, and a pressure sensor installed on the steam recovery pipe to control the set pressure of the steam. The electronic valve for opening and closing the flow path as detected and installed on the steam recovery pipe to prevent the flow of cold water back to the steam supply pipe The steam generator in a closed circuit hot water boiler system, characterized in that a check valve configured. The method of claim 1, A check valve is installed on the pipe connected between the superheater and the scale separation tank, and a pipe with a check valve is installed between the bottom surface of the scale separation tank and the pipe, and an outlet pipe having an electromagnetic valve is connected to the pipe. Steam generator of a closed circuit hot water boiler system. delete