System for preparing high-temperature hot water by combining low-grade high-heat waste water with water source heat pump unit in efficient gradient utilization mode

Abstract

The utility model relates to the technical field of hot water supply systems, and discloses a system for preparing high-temperature hot water by combining low-grade high-heat waste water with a water source heat pump unit in a high-efficiency and gradient manner. The water outlet end on one side of a first-stage plate heat exchanger is connected with the water inlet end on the same side of a second-stage plate heat exchanger; a water outlet end on one side of the second-stage plate heat exchanger is connected with a water inlet end on the same side of the third-stage plate heat exchanger; the primary plate heat exchanger is communicated with the primary evaporator, the secondary plate heat exchanger is communicated with the secondary evaporator, and the tertiary plate heat exchanger is communicated with the tertiary evaporator; the first-stage evaporator, the second-stage evaporator and the third-stage evaporator are respectively matched with the first-stage condenser, the second-stage condenser and the third-stage condenser; and the first-stage condenser, the second-stage condenser and the third-stage condenser are respectively communicated with the first-stage water tank, the second-stage water tank and the third-stage water tank. The device has the advantages that heat in waste water can be utilized at the highest efficiency, and the environment cannot be polluted.

Description

Technical Field

[0001] The utility model relates to the technical field of hot water supply systems, in particular to a system for efficiently utilizing low-grade high-calorie wastewater in combination with a water source heat pump unit to produce high-temperature hot water. Background Art

[0002] There are many ways to produce domestic hot water on the market, including gas boilers, electric boilers, solar energy equipment, etc. These equipment can produce hot water, but they all have shortcomings. Gas boilers and electric boilers have low energy efficiency and consume more gas and electricity. Solar energy cannot meet user needs in rainy and snowy seasons and cold winter areas. All of these problems have troubled users. In the production process, factories will generate a lot of waste heat, waste gas, and wastewater due to process requirements. If this heat is not recycled and cannot be discharged directly, it will cause heat waste and have an adverse impact on the atmospheric environment, directly affecting human production and life. Utility Model Content

[0003] 1. Technical Problems Solved

[0004] The technical problem to be solved by the utility model is that the existing wastewater treatment system cannot utilize the heat in the wastewater with the highest efficiency, and direct discharge will pollute the environment.

[0005] 2. Technical Solution

[0006] In order to solve the above technical problems, the utility model provides the following technical solutions: a system for efficiently utilizing low-grade high-calorie wastewater in combination with a water source heat pump unit to produce high-temperature hot water, including a heat exchanger and a water tank.

[0007] The heat exchanger adopts a plate heat exchanger, and the heat exchanger includes a primary plate heat exchanger, a secondary plate heat exchanger and a tertiary plate heat exchanger. One side of the water outlet of the primary plate heat exchanger is connected to the same side of the water inlet of the secondary plate heat exchanger, and one side of the water outlet of the secondary plate heat exchanger is connected to the same side of the water inlet of the tertiary plate heat exchanger.

[0008] The first-stage plate heat exchanger is in communication with the first-stage evaporator, the second-stage plate heat exchanger is in communication with the second-stage evaporator, and the third-stage plate heat exchanger is in communication with the third-stage evaporator;

[0009] The primary evaporator, the secondary evaporator and the tertiary evaporator are respectively matched with the primary condenser, the secondary condenser and the tertiary condenser;

[0010] The primary condenser, the secondary condenser and the tertiary condenser are respectively connected to the primary water tank, the secondary water tank and the tertiary water tank.

[0011] Furthermore, the water inlet and outlet on the other side of the primary plate heat exchanger, the secondary plate heat exchanger and the tertiary plate heat exchanger are respectively connected to the water inlet and outlet of the primary evaporator, the secondary evaporator and the tertiary evaporator.

[0012] Furthermore, solenoid valves are provided on the pipelines connecting the first-stage plate heat exchanger, the second-stage plate heat exchanger and the third-stage plate heat exchanger with the water inlets of the first-stage evaporator, the second-stage evaporator and the third-stage evaporator.

[0013] Furthermore, solenoid valves are provided on the pipelines connecting the water outlet ends of the primary condenser, the secondary condenser and the tertiary condenser with the primary water tank, the secondary water tank and the tertiary water tank.

[0014] 3. Beneficial Effects

[0015] The advantages of the utility model compared with the prior art are:

[0016] The heat in the wastewater can be completely recovered and utilized through multi-stage heat exchange, thereby meeting the demand for heat and reducing the pollution of the wastewater to the atmospheric environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The following is a schematic diagram of the system for this practical application;

[0018] Figure 2 A schematic diagram of a system according to an embodiment of the present utility;

[0019] Figure numerals: 1. primary plate heat exchanger, 2. secondary plate heat exchanger, 3. tertiary plate heat exchanger, 4. primary evaporator, 5. primary condenser, 6. secondary evaporator, 7. secondary condenser, 8. tertiary evaporator, 9. tertiary condenser, 10. primary water tank, 11. secondary water tank, 12. tertiary water tank. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present utility model are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present utility model, not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present utility model.

[0021] It should be noted that all directional indications such as up, down, left, right, front, back... in the embodiments of the utility model are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0022] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0023] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0024] The utility model will now be further described in conjunction with the accompanying drawings.

[0025] Example

[0026] Combined with Figure 1-2 The selected primary plate heat exchanger 1, secondary plate heat exchanger 2 and tertiary plate heat exchanger 3 are titanium plate heat exchangers. The low-grade high-temperature wastewater first enters the primary plate heat exchanger 1, and the primary plate heat exchanger 1 exchanges heat with the clean water on the other side. The clean water exchanged by the primary plate heat exchanger 1 enters the first-stage water source heat pump unit, and high-temperature hot water is generated on the use side and stored in the hot water tank.

[0027] After the wastewater is exchanged from the primary plate heat exchanger 1, it enters the secondary plate heat exchanger 2 to exchange heat with the clean water on the other side. After the heat exchange, the clean water enters the secondary water source heat pump unit again as a water source, and the high-temperature hot water coming out of the side is stored in the water tank.

[0028] After the wastewater is exchanged from the secondary plate heat exchanger 2, it enters the tertiary plate heat exchanger 3 to exchange heat with the clean water on the other side. After the heat exchange, the clean water enters the tertiary water source heat pump unit again as a water source, and the high-temperature hot water coming out of the side is stored in the water tank.

[0029] Take multi-stage or cascade utilization of wastewater to maximize the utilization of wastewater when it is discharged. Since the wastewater generally generated during factory production is around 45 degrees and the amount of wastewater is large, if it is discharged directly, too much heat will be wasted, and such high heat will cause a great urban heat island effect on the atmospheric environment. We have adopted the method of using industrial wastewater as a high-calorie water source combined with a water source heat pump unit to produce higher temperature water for production and living applications. Combined with the characteristics of the water source heat pump unit, if 45-degree water is used in a single stage, it can only generate a maximum of 20 degrees of temperature difference heat. At this time, the 25-degree water still contains a lot of heat energy and cannot be discharged directly, so a multi-stage application is adopted to allow the 25-degree water to enter the secondary water source heat pump unit again. After the secondary application, it will be used in the third stage until heat cannot be extracted and the wastewater is discharged. These wastewaters serve as the water source side of the water source heat pump unit. They are a high-calorie, low-grade heat source. Due to the production process requirements, these waters usually contain a large amount of ions that are corrosive to steel, copper, etc. Therefore, these waters cannot directly enter our conventional water source heat pump units. At this time, two ways are needed to utilize this wastewater: one is that the heat exchanger on the water source side of the water source heat pump unit needs to be changed to a corrosion-resistant titanium tube heat exchange tube. This heat exchanger has strong corrosion resistance, and the wastewater can directly enter the unit equipment for heat extraction to generate high-grade heat; the other is that these wastewaters are exchanged with clean water through a titanium plate heat exchanger. After absorbing the heat, the clean water enters the water source heat pump unit as a water source for recycling to generate a high-grade heat source.

[0030] The utility model and its implementation methods are described, and such description is not restrictive. The drawings are only one of the implementation methods of the utility model, and the actual structure is not limited thereto. In short, if ordinary technicians in this field are inspired by it, without departing from the purpose of the invention of the utility model, they can design a structure and implementation method similar to the technical solution without creativity, which should belong to the protection scope of the utility model.

Claims

1. A system for efficiently utilizing low-grade high-calorie wastewater in combination with a water source heat pump unit to produce high-temperature hot water, including a heat exchanger and a water tank, characterized in that: The heat exchanger is a plate heat exchanger, comprising a primary plate heat exchanger (1), a secondary plate heat exchanger (2) and a tertiary plate heat exchanger (3); a water outlet on one side of the primary plate heat exchanger (1) is connected to a water inlet on the same side of the secondary plate heat exchanger (2); a water outlet on one side of the secondary plate heat exchanger (2) is connected to a water inlet on the same side of the tertiary plate heat exchanger (3); The first-stage plate heat exchanger (1) is in communication with the first-stage evaporator (4), the second-stage plate heat exchanger (2) is in communication with the second-stage evaporator (5), and the third-stage plate heat exchanger (3) is in communication with the third-stage evaporator (6); The primary evaporator (4), the secondary evaporator (5) and the tertiary evaporator (6) are respectively matched with the primary condenser (7), the secondary condenser (8) and the tertiary condenser (9); The primary condenser (7), the secondary condenser (8) and the tertiary condenser (9) are respectively connected to the primary water tank (10), the secondary water tank (11) and the tertiary water tank (12).

2. According to claim 1, a system for efficiently utilizing low-grade high-calorie wastewater in combination with a water source heat pump unit to produce high-temperature hot water is characterized by: The water inlet and water outlet on the other side of the primary plate heat exchanger (1), the secondary plate heat exchanger (2) and the tertiary plate heat exchanger (3) are respectively connected to the water inlet and water outlet of the primary evaporator (4), the secondary evaporator (5) and the tertiary evaporator (6).

3. According to claim 2, a system for efficiently utilizing low-grade high-calorie wastewater in combination with a water source heat pump unit to produce high-temperature hot water is characterized in that: Solenoid valves are provided on pipelines connecting the first-stage plate heat exchanger (1), the second-stage plate heat exchanger (2) and the third-stage plate heat exchanger (3) with the water inlets of the first-stage evaporator (4), the second-stage evaporator (5) and the third-stage evaporator (6).

4. According to claim 2, a system for efficiently utilizing low-grade high-calorie wastewater in combination with a water source heat pump unit to produce high-temperature hot water is characterized in that: Solenoid valves are provided on pipelines connecting the water outlet ends of the primary condenser (7), the secondary condenser (8) and the tertiary condenser (9) with the primary water tank (10), the secondary water tank (11) and the tertiary water tank (12).

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