CN108800099B - A kind of boiler feed water energy-saving preheating device and method - Google Patents

Abstract

The invention relates to an energy-saving preheating device for boiler feed water, comprising a boiler, a heat exchanger, a softened water tank, a water tank, a water mixing tank and a PLC controller. The first water outlet is connected to the water inlet of the heat exchanger through a water pipe, the second water outlet of the softened water tank is connected to the cold water inlet of the mixing tank through a water pipe installed with flow valve B and temperature sensor B, and the first inlet of the water tank is installed The water pipe with solenoid valve A is connected with the water outlet of the heat exchanger, the outlet of the water tank is connected with the hot water inlet of the mixing tank through the water pipe installed with flow valve C and temperature sensor A, and the outlet of the mixing tank is connected with the water inlet of the boiler through the water pipe connect. The beneficial effects of the invention are as follows: the softened water is heated by the thermal energy in the high-temperature flue gas, excess steam and excess hot water; the temperature of the softened water input into the boiler is controlled within a temperature range by intelligent control of the PLC controller. Inside.

Description

A kind of boiler feed water energy-saving preheating device and method

technical field

The invention relates to the technical field of boilers, in particular to a boiler feed water energy-saving preheating device and method.

Background technique

The boiler is an energy conversion device. The energy input to the boiler includes chemical energy and electrical energy in the fuel, and the boiler outputs steam, high-temperature water or organic heat carrier with certain thermal energy.

Supplying demineralized water with a certain temperature to the boiler can improve the efficiency of the boiler and save energy. The high-temperature flue gas generated by the boiler combustion contains high thermal energy. Direct discharge not only causes waste of energy, but also affects the surrounding ambient temperature. Therefore, the use of high temperature The heating of softened water by flue gas has become a common practice in the industry, but the existing heating device for softened water has an unreasonable structure design, and the temperature of the softened water input into the boiler is difficult to control within a temperature range. The source of thermal energy for softening water heating Single, the excess steam and hot water generated by the boiler cannot be reasonably utilized.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the above problems existing in the prior art, and to provide a boiler feed water energy-saving preheating device, which utilizes high-temperature flue gas, excess steam, and thermal energy in excess hot water to heat softened water, and uses a PLC controller to heat softened water. The intelligent control enables the temperature of the softened water input into the boiler to be controlled within a temperature range, and at the same time provides an energy-saving preheating method for the boiler feed water.

In order to realize the above-mentioned technical purpose and achieve the above-mentioned technical effect, the present invention is realized through the following technical solutions:

An energy-saving preheating device for boiler feed water, comprising a boiler, a heat exchanger, a softened water tank, a water tank, a mixed water tank, and a PLC controller. The first water outlet of the water tank is connected to the water inlet of the heat exchanger through the water pipe installed with flow valve A, and the second water outlet of the softened water tank is connected to the cold water inlet of the mixing tank through the water pipe installed with flow valve B and temperature sensor B. The first inlet of the water tank is connected to the water outlet of the heat exchanger through the water pipe installed with the solenoid valve A, and the outlet of the water tank is connected to the hot water inlet of the mixing tank through the water pipe installed with the flow valve C and the temperature sensor A. connection, the outlet of the mixing tank is connected with the water inlet of the boiler through a water pipe equipped with a booster pump and a temperature sensor C, and the PLC controller is respectively connected with the temperature sensor A, temperature sensor B, temperature sensor C, flow valve A, The flow valve B, the flow valve C, the solenoid valve A and the booster pump are connected, the second inlet of the water tank is connected with the steam outlet of the boiler through the water pipe installed with the solenoid valve B, and the solenoid valve B is electrically connected to the PLC controller The third inlet of the water tank is connected to the water outlet of the boiler through a water pipe installed with a solenoid valve C, and the solenoid valve C is electrically connected to the PLC controller.

Further, the mixing tank is a funnel type, and an electric mixer connected to a PLC controller is installed in the mixing tank.

Further, the heat exchanger includes a U-shaped box body, a general water inlet pipe, a general water outlet pipe, multiple sets of coiled pipes arranged in parallel with each other, an exhaust fan, and a gas collecting hood. The coiled pipes are all fixedly installed in the box body, the exhaust fan and the air collecting hood are installed at the smoke outlet of the box body, and the exhaust fan is electrically connected with the PLC controller.

Further, the horizontal height of the total water inlet pipe is greater than the horizontal height of the total water outlet pipe.

Further, the bottom end of the box body is provided with a dust collecting funnel, and the bottom of the dust collecting funnel is installed with a Jiaolong conveyor electrically connected with the PLC controller.

Further, a thermal insulation layer is installed on the outer side of the box body, and the thermal insulation layer is composed of rock wool board and glass fiber cloth.

A boiler feed water energy-saving preheating method, which adopts the above-mentioned boiler feed water energy-saving preheating device, introduces high-temperature flue gas generated by boiler combustion and softened water from a softening water tank into a heat exchange box for heat exchange, and heats the softened water to form thermal softening. Water, hot softened water flows into the water tank and is stored, and the hot softened water in the water tank and the softened water in the softened water tank are input into the water mixer in proportion to be mixed to make boiler water that meets the boiler water temperature requirements.

The beneficial effect of the present invention is that the softened water is heated by the thermal energy in the high-temperature flue gas, excess steam and excess hot water, so that the source of heat energy for heating the softened water is abundant, and the high-temperature flue gas, excess steam, Reasonable utilization of thermal energy in excess hot water; intelligent control of PLC controller to control the temperature of softened water input into the boiler within a temperature range.

Description of drawings

The accompanying drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the attached image:

1 is a schematic structural diagram of an embodiment of the present invention;

Fig. 2 is the structural schematic diagram of the heat exchanger in the embodiment of the present invention;

FIG. 3 is a frame diagram of a connection relationship between a PLC controller and components controlled by it in an embodiment of the present invention.

Description of symbols in the figure: 1-boiler, 2-heat exchanger, 3-softened water tank, 4-water tank, 5-mixing water tank, 6-PLC controller, 7-pipeline, 8-water pipe, 9-flow valve A, 10 -flow valve B, 11-flow valve C, 12-temperature sensor A, 13-temperature sensor B, 14-temperature sensor C, 15-solenoid valve A, 16-solenoid valve B, 17-solenoid valve C, 18-increase Pressure pump, 19-box, 20-total inlet pipe, 21-coil pipe, 22-total outlet pipe, 23-exhaust fan, 24-gas collecting hood, 25-dust collecting funnel, 26-dragon conveyor, 27- Insulation.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

As shown in Figures 1 to 3, an energy-saving preheating device for boiler feed water includes a boiler, a heat exchanger, a softened water tank, a water tank, a mixing tank, and a PLC controller. The smoke inlet is connected, the first water outlet of the softened water tank is connected to the water inlet of the heat exchanger through a water pipe installed with a flow valve A, and the second water outlet of the softened water tank is installed with a flow valve B and a temperature sensor B. The water pipe is connected to the cold water inlet of the mixing tank, the first inlet of the water tank is connected to the water outlet of the heat exchanger through the water pipe installed with the solenoid valve A, and the outlet of the water tank is installed with the flow valve C and the temperature sensor A. The water pipe is connected with the hot water inlet of the mixed water tank, the outlet of the mixed water tank is connected with the water inlet of the boiler through the water pipe installed with the booster pump and the temperature sensor C, and the PLC controller is respectively connected with the temperature sensor A, temperature sensor B, The temperature sensor C, the flow valve A, the flow valve B, the flow valve C, the solenoid valve A, and the booster pump are connected, and the second inlet of the water tank is connected to the steam outlet of the boiler through the water pipe installed with the solenoid valve B. The valve B is electrically connected to the PLC controller, the third inlet of the water tank is connected to the water outlet of the boiler through a water pipe installed with a solenoid valve C, and the solenoid valve C is electrically connected to the PLC controller.

Further, the mixing tank is a funnel type, and an electric mixer connected to a PLC controller is installed in the mixing tank. The electric stirrer stirs the hot demineralized water and the demineralized water, which is conducive to the uniform mixing of the hot demineralized water and the demineralized water.

Further, the heat exchanger includes a U-shaped box body, a general water inlet pipe, a general water outlet pipe, multiple sets of coiled pipes arranged in parallel with each other, an exhaust fan, and a gas collecting hood. The coiled pipes are all fixedly installed in the box body, the exhaust fan and the air collecting hood are installed at the smoke outlet of the box body, and the exhaust fan is electrically connected with the PLC controller. The horizontal height of the general water inlet pipe is greater than the horizontal height of the general water outlet pipe, and the softened water flows in from the general water inlet pipe and flows out from the general water outlet pipe by using the pressure difference.

Further, the bottom end of the box is provided with a dust collecting funnel, and the bottom of the dust collecting funnel is installed with a Jiaolong conveyor that is electrically connected to the PLC controller, so as to remove the smoke and dust settled at the bottom of the box in time.

Further, a thermal insulation layer is installed on the outer side of the box body, and the thermal insulation layer is composed of rock wool board and glass fiber cloth.

The PLC controller dynamically adjusts the flow area of the valve ports of flow valve B and flow valve C according to the temperature monitoring data sent by temperature sensor A and temperature sensor B, so that the temperature of the softened water input into the boiler is controlled within a temperature range Inside.

A boiler feed water energy-saving preheating method, which adopts the above-mentioned boiler feed water energy-saving preheating device, introduces high-temperature flue gas generated by boiler combustion and softened water from a softening water tank into a heat exchange box for heat exchange, and heats the softened water to form thermal softening. Water, hot softened water flows into the water tank and is stored, and the hot softened water in the water tank and the softened water in the softened water tank are input into the water mixer in proportion to be mixed to make boiler water that meets the boiler water temperature requirements.

The softened water is heated by using the heat energy in the high temperature flue gas, excess steam and excess hot water, so that the heat energy source for heating the softened water is rich, and the heat energy in the high temperature flue gas, excess steam and excess hot water is realized. Reasonable utilization; use PLC controller intelligent control to control the temperature of softened water input into the boiler within a temperature range.

The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments, and the descriptions in the above-mentioned embodiments and the description are only to illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have Various changes and modifications fall within the scope of the claimed invention.

Claims (7)

1. A boiler feed water energy-saving preheating device is characterized in that: comprising a boiler, a heat exchanger, a softened water tank, a water tank, a water mixing tank, a PLC controller, and the smoke outlet of the boiler is passed through the pipe and the heat exchanger into the smoke The first water outlet of the softened water tank is connected to the water inlet of the heat exchanger through the water pipe installed with the flow valve A, and the second water outlet of the softened water tank is installed through the water pipe installed with the flow valve B and the temperature sensor B. It is connected with the cold water inlet of the mixing tank, the first inlet of the water tank is connected with the water outlet of the heat exchanger through the water pipe installed with the solenoid valve A, and the outlet of the water tank is connected with the water pipe installed with the flow valve C and the temperature sensor A. The hot water inlet of the mixed water tank is connected, and the outlet of the mixed water tank is connected to the water inlet of the boiler through a water pipe equipped with a booster pump and a temperature sensor C, and the PLC controller is respectively connected with the temperature sensor A, temperature sensor B, temperature sensor C. The flow valve A, the flow valve B, the flow valve C, the solenoid valve A, and the booster pump are connected, and the second inlet of the water tank is connected to the steam outlet of the boiler through the water pipe installed with the solenoid valve B, and the solenoid valve B is connected to the steam outlet of the boiler. It is electrically connected to the PLC controller, and the third inlet of the water tank is connected to the water outlet of the boiler through a water pipe installed with a solenoid valve C, and the solenoid valve C is electrically connected to the PLC controller. 2 . The energy-saving preheating device for boiler feed water according to claim 1 , wherein the mixing tank is a funnel type, and an electric agitator connected to a PLC controller is installed in the mixing tank. 3 . 3. The boiler feed water energy-saving preheating device according to claim 1, characterized in that: the heat exchanger comprises a U-shaped box body, a general water inlet pipe, a general water outlet pipe, multiple groups of coil pipes arranged in parallel with each other, and an exhaust pipe. Fan and air collecting hood, the general water inlet pipe, general water outlet pipe, and multiple sets of coiled pipes are all fixedly installed in the box body, the exhaust fan and the air collecting hood are installed at the smoke outlet of the box body, and the exhaust fan It is electrically connected with the PLC controller. 4 . The energy-saving preheating device for boiler feed water according to claim 3 , wherein the horizontal height of the general water inlet pipe is greater than the horizontal height of the general water outlet pipe. 5 . 5. The energy-saving preheating device for boiler feed water according to claim 3, characterized in that: the bottom end of the box is provided with a dust collecting funnel, and the bottom of the dust collecting funnel is installed with a dust collecting funnel that is electrically connected to the PLC controller. Jiaolong conveyor. 6 . The energy-saving preheating device for boiler feed water according to claim 3 , wherein a thermal insulation layer is installed on the outer side of the box, and the thermal insulation layer is composed of rock wool board and glass fiber cloth. 7 . 7. A boiler feed water energy-saving preheating method, using the boiler feed water energy-saving preheating device described in any one of claims 1 to 5, characterized in that: the high-temperature flue gas generated by boiler combustion and the softened water of the softened water tank are introduced into heat exchange The heat exchange is carried out in the tank, and the softened water is heated to form hot softened water. The hot softened water flows into the water tank and is stored. Boiler water required by the boiler water temperature.