Boiler energy-saving equipment

Abstract

The utility model relates to boiler energy-saving equipment which comprises boiler equipment, heat exchange equipment, cooling equipment, a three-way valve, a variable-frequency feed pump, a make-up pump and a controller. The heat exchange equipment comprises an exchange tank, a boiler water supply pipe, a first condensation pipe arranged in the exchange tank, a first pipeline communicated with the first condensation pipe, a first discharge pipe communicated with the exchange tank and the atmosphere, and a second pipeline communicated with the first condensation pipe; the exchange tank water outlet is communicated with boiler equipment through a boiler water supply pipe; the cooling equipment comprises a cooling tank, a cooling distributor arranged in the cooling tank, a second discharge pipe communicated with the cooling tank and the atmosphere, a third pipeline communicated with the cooling tank, and a liquid level detector arranged on the cooling tank; a first port of the three-way valve is communicated with the exchange tank water inlet, a second port of the three-way valve is communicated with the cooling tank water inlet, and a third port of the three-way valve is communicated with the cooling tank water outlet through the variable-frequency feed pump; the cooling tank communicates with a make-up pump. The system can efficiently recover latent heat and sensible heat energy in steam.

Description

Technical Field

[0001] The utility model relates to the technical field of boiler equipment, in particular to a boiler energy-saving device. Background Art

[0002] In a steam power system, water is heated and converted into steam, and then the steam pressure is used to drive a power device. This technology is widely used in industries such as power generation, heating, chemical engineering, and printing and dyeing.

[0003] The energy of steam consists of latent heat and sensible heat. Latent heat, short for phase change latent heat, is the heat absorbed or released when a substance changes from one phase to another under isothermal and isobaric conditions; sensible heat is the heat required for an object to increase or decrease in temperature without undergoing chemical changes or phase changes. When steam is used as a heat source, mainly the latent heat of steam is utilized. In a steam power system, the latent heat of steam cannot be fully utilized, so part of the latent heat and sensible heat of steam are discharged into the atmosphere, resulting in energy waste. Content of the Utility Model

[0004] Therefore, in view of the above problems, the utility model proposes a boiler energy-saving device that can efficiently recover the latent heat and sensible heat energy in steam.

[0005] To achieve the above object, the utility model adopts the following technical solutions:

[0006] A boiler energy-saving device includes a boiler device, a heat exchange device, a cooling device, a three-way valve, a variable-frequency feed pump, a makeup water pump, and a controller;

[0007] The heat exchange device includes an exchange tank, a boiler feed water pipe, a first condensing pipe arranged in the exchange tank, a first pipe arranged on the exchange tank and communicating with the air inlet of the first condensing pipe, a first discharge pipe arranged on the exchange tank and communicating the exchange tank with the atmosphere, and a second pipe arranged on the exchange tank and communicating with the air outlet of the first condensing pipe; an exchange tank water outlet is opened at the upper end of the exchange tank, an exchange tank water inlet is opened at the lower end of the exchange tank, and the exchange tank water outlet is communicated with the boiler device through the boiler feed water pipe;

[0008] The cooling device includes a cooling tank, a cooling distributor arranged inside the cooling tank, a second discharge pipe arranged on the cooling tank and communicating the cooling tank with the atmosphere, a third pipe arranged on the cooling tank and communicating with the inside of the cooling tank, and a liquid level detector arranged on the cooling tank for detecting the liquid level height in the cooling tank; the second pipe is communicated to a position below the cooling distributor inside the cooling tank; a first cooling tank water inlet and a second cooling tank water inlet are opened at the upper end of the cooling tank, and a cooling tank water outlet is opened at the lower end of the cooling tank;

[0009] The first port of the three-way valve is connected to the water inlet of the exchange tank, the second port of the three-way valve is connected to the water inlet of the cooling tank, and the third port of the three-way valve is connected to the water outlet of the cooling tank through a variable-frequency water supply pump;

[0010] The second water inlet of the cooling tank is connected to a make-up water pump;

[0011] The variable-frequency water supply pump, the make-up water pump, and the liquid level detector are respectively electrically connected to the controller.

[0012] Further, a first safety valve is provided on the first discharge pipe, and a second safety valve is provided on the second discharge pipe.

[0013] Further, a check valve is also connected between the second water inlet of the cooling tank and the make-up water pump.

[0014] Further, a water replenishing device is further included; the water replenishing device includes a water replenishing tank, a second condenser tube provided in the water replenishing tank, a fourth pipe provided on the water replenishing tank and communicating with the air inlet of the second condenser tube, and a fifth pipe provided on the water replenishing tank and communicating with the air outlet of the second condenser tube;

[0015] The air inlet of the second condenser tube is connected to the second pipe through the fourth pipe;

[0016] A water replenishing tank water outlet communicating with the make-up water pump is provided on the water replenishing tank, and a water replenishing tank water inlet is further provided on the water replenishing tank.

[0017] Further, the water inlet of the second cooling tank is at the same height as the cooling distributor or above the cooling distributor.

[0018] By adopting the foregoing technical solutions, the beneficial effects of the present utility model are:

[0019] When this boiler energy-saving device is in use, the steam to be recycled is sequentially input into the heat exchange device and the cooling device through the first pipe, the heat of the steam is recovered, the condensed water after the steam is condensed flows into the cooling tank for recycling, and the liquid level in the cooling tank is detected by the liquid level detector and transmitted to the controller, and the controller controls the start and stop of the make-up water pump to keep the water level in the cooling tank balanced. When the boiler needs to replenish water for the equipment, by controlling the start and stop of the variable-frequency water supply pump and the make-up water pump, on the one hand, the liquid levels in the exchange tank and the cooling tank are controlled, and on the other hand, the demand for the boiler to replenish water for the equipment is met. This boiler energy-saving device can efficiently recover the latent heat and sensible heat energy in the steam, and is safe, reliable and highly automated. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of the present utility model.

[0021] Figure 2 is a circuit connection block diagram of the utility model. Specific Embodiments

[0022] The present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0023] Referring to Figure 1 and Figure 2 , this embodiment provides a boiler energy-saving device, which includes a boiler device 1, a heat exchange device 2, a cooling device 3, a three-way valve 4, a variable-frequency feed water pump 5, a make-up water pump 6, a check valve 7, a controller 8, and a make-up water device 9.

[0024] Specifically:

[0025] The heat exchange device 2 includes an exchange tank 21, a boiler feed water pipe 22, a first condensate pipe 23 disposed in the exchange tank 21, a first pipe 24 disposed on the exchange tank 21 and communicating with the intake port of the first condensate pipe 23 (not marked in the figure, but those skilled in the art should understand the position of the intake port of the first condensate pipe 23), a first discharge pipe 25 disposed on the exchange tank 21 and communicating the exchange tank 21 with the atmosphere, a first safety valve 26 disposed on the first discharge pipe 25, and a second pipe 27 disposed on the exchange tank 21 and communicating with the outlet port of the first condensate pipe 23 (not marked in the figure, but those skilled in the art should understand the position of the outlet port of the first condensate pipe 23). By providing the first safety valve 26 on the first discharge pipe 25, if the air pressure in the exchange tank 21 is higher than the exhaust air pressure of the first safety valve 26, it will automatically exhaust air to prevent the air pressure in the exchange tank 21 from being too high.

[0026] An exchange tank water outlet is provided at the upper end of the exchange tank 21, and an exchange tank water inlet is provided at the lower end of the exchange tank 21. Neither the exchange tank water outlet nor the exchange tank water inlet is marked in the figure, but those skilled in the art should understand the positions of the exchange tank water outlet and the exchange tank water inlet on the exchange tank 21. The exchange tank water outlet communicates with the boiler device 1 through the boiler feed water pipe 22, and the water in the exchange tank 21 is transmitted to the boiler device 1 through the boiler feed water pipe 22 to supply water to the boiler device 1.

[0027] The cooling device 3 includes a cooling tank 31, a cooling distributor 32 disposed inside the cooling tank 31, a second discharge pipe 35 disposed on the cooling tank 31 and communicating the cooling tank 31 with the atmosphere, a second safety valve 36 disposed on the second discharge pipe 35, a third pipe 33 disposed on the cooling tank 31 and communicating with the inside of the cooling tank 31, and a liquid level detector 34 disposed on the cooling tank 31 for detecting the liquid level height in the cooling tank 31. Both the cooling distributor 32 and the liquid level detector 34 are existing devices and will not be elaborated here in detail. By providing the second safety valve 36 on the second discharge pipe 35, if the air pressure in the cooling tank 31 is higher than the exhaust air pressure of the second safety valve 36, it will automatically exhaust air to prevent the air pressure in the cooling tank 31 from being too high.

[0028] The second pipeline 27 is connected to a position inside the cooling tank 31 below the cooling distributor 32; the upper end of the cooling tank 31 is provided with a first cooling tank water inlet and a second cooling tank water inlet, and the lower end of the cooling tank is provided with a cooling tank water outlet; the first cooling tank water inlet, the second cooling tank water inlet, and the cooling tank water outlet are not shown in the figure, but those skilled in the art should understand the positions of the first cooling tank water inlet, the second cooling tank water inlet, and the cooling tank water outlet on the cooling tank 31. The second cooling tank water inlet is at the same height as the cooling distributor 32 or above the cooling distributor 32.

[0029] The first port of the three-way valve 4 is connected to the exchange tank water inlet, the second port of the three-way valve 4 is connected to the cooling tank water inlet, and the third port of the three-way valve 4 is connected to the cooling tank water outlet through a variable-frequency water supply pump 5.

[0030] The second cooling tank water inlet is connected to a makeup water pump 6 through a check valve 7; the check valve 7 is provided to prevent water from flowing back. Of course, the check valve 7 may not be provided.

[0031] The makeup water device 8 includes a makeup water tank 81, a second condensing pipe 82 provided in the makeup water tank 81, a fourth pipeline 83 provided on the makeup water tank 82 and connected to the air inlet of the second condensing pipe 81 (not marked in the figure, but those skilled in the art should understand the position of the air inlet of the second condensing pipe 81), and a fifth pipeline 84 provided on the makeup water tank 81 and connected to the air outlet of the second condensing pipe 82; the air inlet of the second condensing pipe 82 is connected to the second pipeline 33 through the fourth pipeline 83.

[0032] The makeup water tank 81 is provided with a makeup water tank water outlet connected to the makeup water pump 6 (not shown in the figure, but those skilled in the art should understand the position of the makeup water tank water outlet on the makeup water tank 81), and the makeup water tank 81 is also provided with a makeup water tank water inlet, and the makeup water tank water inlet is used to connect to tap water or a soft water device, which is not shown in the figure. The water output from the tap water or the soft water device is transmitted to the boiler equipment 1 for makeup water through the makeup water tank 81, the makeup water pump 6, the check valve 7, the cooling tank 31, the variable-frequency water supply pump 5, the three-way valve 4, the exchange tank 21, and the boiler feed water pipe 22 in sequence.

[0033] The variable-frequency water supply pump 5, the makeup water pump 6, and the liquid level detector 34 are respectively electrically connected to the controller 9. The liquid level detector 34 detects the liquid level height in the cooling tank 31 and transmits it to the controller 9. The start and stop of the variable-frequency water supply pump 5 and the makeup water pump 6 are controlled by the controller 9.

[0034] During use, the steam to be recycled is sequentially input into the heat exchange device 2 and the cooling device 3 through the first pipeline 24 to recover heat. Specifically, the steam is input into the first condensing pipe 23 through the first pipeline 24. Since the temperature of the water in the exchange tank 21 is lower than the temperature of the steam in the first condensing pipe 23, most of the steam condenses after transferring heat to the water in the exchange tank 21; the remaining steam and condensed water further recover heat in the cooling tank 31 through the second pipeline 27, thereby recovering the heat of the steam, and the condensed water is also input into the cooling tank 31 for recovery. The gas after heat recovery can be discharged into the atmosphere through the third pipeline 33, or can be introduced into the water replenishing device 8 to further recover heat, specifically by recovering heat through the second condensing pipe 82.

[0035] The liquid level in the cooling tank 31 is detected by the liquid level detector 34 and transmitted to the controller 9. When the boiler needs to be replenished with water by the device 1, by controlling the start and stop of the variable frequency water supply pump 5 and the water replenishing pump 6, the liquid level in the cooling tank 31 is detected by the liquid level detector 34 and transmitted to the controller 9. On the one hand, the liquid levels in the exchange tank 21 and the cooling tank 31 are controlled, and on the other hand, the water replenishing requirement of the boiler by the device 1 is met.

[0036] This energy-saving device for boilers is safe, reliable and highly automated.

[0037] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes can be made to the present invention in form and detail without departing from the spirit and scope of the present invention defined by the appended claims, and all such changes are within the protection scope of the present invention.

Claims

1. A boiler energy-saving device, characterized in that: Including boiler equipment, heat exchange equipment, cooling equipment, three-way valve, variable frequency feed water pump, make-up water pump, and controller; The heat exchange device comprises an exchange tank, a boiler water supply pipe, a first condenser arranged in the exchange tank, a first pipe arranged on the exchange tank and connected to the air inlet of the first condenser, a first discharge pipe arranged on the exchange tank and connected to the exchange tank and the atmosphere, and a second pipe arranged on the exchange tank and connected to the air outlet of the first condenser; an exchange tank water outlet is provided at the upper end of the exchange tank, an exchange tank water inlet is provided at the lower end of the exchange tank, and the exchange tank water outlet is connected to the boiler device through the boiler water supply pipe; The cooling device comprises a cooling tank, a cooling distributor arranged inside the cooling tank, a second discharge pipe arranged on the cooling tank and connected to the cooling tank and the atmosphere, a third pipe arranged on the cooling tank and connected to the inside of the cooling tank, and a liquid level detector arranged on the cooling tank for detecting the liquid level in the cooling tank; the second pipe is connected to the inside of the cooling tank and is located below the cooling distributor; the first cooling tank water inlet and the second cooling tank water inlet are provided at the upper end of the cooling tank, and the cooling tank water outlet is provided at the lower end of the cooling tank; The first port of the three-way valve is connected to the water inlet of the exchange tank, the second port of the three-way valve is connected to the water inlet of the cooling tank, and the third port of the three-way valve is connected to the water outlet of the cooling tank through a variable frequency water pump; The water inlet of the second cooling tank is connected to the water replenishment pump; The variable frequency water supply pump, water replenishment pump, and liquid level detector are electrically connected to the controller respectively.

2. A boiler energy-saving device according to claim 1, characterized in that: The first discharge pipe is provided with a first safety valve, and the second discharge pipe is provided with a second safety valve.

3. The boiler energy-saving device according to claim 1, characterized in that: A check valve is also connected between the water inlet of the second cooling tank and the water replenishment pump.

4. The boiler energy-saving device according to claim 1, characterized in that: It also includes water replenishment equipment; The water replenishment device includes a water replenishment tank, a second condenser arranged in the water replenishment tank, a fourth pipe arranged on the water replenishment tank and connected to the air inlet of the second condenser, and a fifth pipe arranged on the water replenishment tank and connected to the air outlet of the second condenser; The air inlet of the second condenser is connected to the second pipe through the fourth pipe; The water replenishment tank is provided with a water replenishment tank water outlet connected with the water replenishment pump, and the water replenishment tank is also provided with a water replenishment tank water inlet.

5. The boiler energy-saving device according to claim 1, characterized in that: The water inlet of the second cooling tank is located at the same height as the cooling distributor or above the cooling distributor.

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