Boiler preheating and heat recovery system

Abstract

The utility model discloses a boiler preheating and heat recovery system which comprises a conduction oil boiler, a steam generator, a water storage tank and a water supply device, a water jacket is arranged on the periphery of the outer wall of the conduction oil boiler, the water jacket is connected with the water storage tank through a water inlet pipe and a water return pipe respectively, and the conduction oil boiler is connected with the steam generator through a conduction oil circulating pipeline. The water supply device comprises a water softening device, a first softened water tank and a second softened water tank, the first softened water tank is connected with a tap water pipe through the water softening device, connected with the water storage tank through a first water outlet pipe and connected with the steam generator through a second water outlet pipe, and the second softened water tank is connected with the water storage tank through a first water inlet pipe. The third water outlet pipe is connected with the steam generator. The heat of the boiler body can be recovered when the boiler enters a shutdown state, and stored hot water can be injected into the water jacket before the boiler is started next time, so that the boiler body is preheated and warmed up, the heat efficiency of the boiler in the starting stage is improved, and the boiler is energy-saving and efficient.

Description

Technical Field

[0001] The utility model relates to the technical field of boilers, in particular to a boiler preheating and heat recovery system. Background Art

[0002] In the existing technology, thermal oil boilers raise the temperature of the heat transfer oil to 250℃-300℃, and then generate steam for use in the workshop through a steam generator. However, due to structural limitations, the following problems exist:

[0003] 1. During startup, the thermal oil boiler body needs to absorb heat to heat up, so the thermal efficiency of the boiler is low in the early stage of operation;

[0004] 2. When the boiler switches from operation to shutdown, the boiler body has a relatively high temperature. The existing technology directly allows the boiler to cool down naturally, resulting in heat loss and high energy consumption.

[0005] Therefore, it is necessary to develop a boiler preheating and heat recovery system. A water jacket is set on the outside of the thermal oil boiler. The water in the water jacket absorbs heat to form hot water and is stored in a water tank or used in a steam generator. This can realize the recovery of heat from the boiler body when the boiler enters the shutdown state. At the same time, before the boiler is started next time, the stored hot water can be injected into the water jacket to preheat the boiler body and increase the temperature, thereby improving the thermal efficiency of the boiler startup stage, saving energy, being efficient, and operating reliably. Utility Model Content

[0006] In order to solve the above problems, the technical solutions adopted by the present invention are as follows:

[0007] A boiler preheating and heat recovery system, comprising a thermal oil boiler, a steam generator, a water storage tank, and a water supply device, characterized in that a water jacket is provided around the outer wall of the thermal oil boiler, a water inlet pipe and a water return pipe connected to the water storage tank are provided on the water inlet and water outlet of the water jacket, respectively, and a first pump body is provided on the return pipe;

[0008] The thermal oil boiler is connected to the steam generator through a thermal oil circulation pipeline, and a second pump body is provided on the thermal oil circulation pipeline;

[0009] The water supply device includes a softening device, a first soft water tank and a second soft water tank. The first soft water tank is connected to the tap water pipe through the softening device, the first soft water tank is connected to the water storage tank through a first water outlet pipe, and is connected to the water inlet of the steam generator through a second water outlet pipe. The second soft water tank is connected to the water storage tank through a first water inlet pipe, and is connected to the water inlet of the steam generator through a third water outlet pipe.

[0010] Preferably, the first water outlet pipe, the second water outlet pipe, the first water inlet pipe and the third water outlet pipe are respectively provided with a first valve, a second valve, a third valve and a fourth valve.

[0011] Preferably, a third pump body and a fourth pump body are respectively provided on the first water outlet pipe and the first water inlet pipe.

[0012] Preferably, the water tank is provided with a first temperature sensor for detecting the temperature of the hot soft water.

[0013] Preferably, a first upper water level sensor and a first lower water level sensor are provided in the water tank.

[0014] Preferably, a second upper water level sensor and a second lower water level sensor are provided in the first soft water tank.

[0015] Preferably, a third upper water level sensor and a third lower water level sensor are provided in the second soft water tank.

[0016] Preferably, the thermal oil boiler is provided with an insulation layer on the outside of the water jacket.

[0017] Preferably, the water storage tank and the second soft water tank are boxes with heat preservation function.

[0018] Preferably, the first valve, the second valve, the third valve and the fourth valve are solenoid valves.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. This utility model sets a water jacket on the outside of the thermal oil boiler through the structural design of the thermal oil boiler. The water in the water jacket absorbs heat to form hot water which is stored in a water tank or used by a steam generator. This realizes the recovery of heat from the boiler body when the boiler enters a shutdown state. At the same time, before the boiler is started next time, the stored hot water can be injected into the water jacket to preheat the boiler body, thereby improving the thermal efficiency of the boiler during the startup phase, saving energy, being efficient, and operating reliably.

[0021] 2. The hot soft water in the second soft water tank or the room temperature soft water in the first soft water tank can be used to supply the steam generator to prepare steam, which not only effectively utilizes the recovered heat energy, but also has higher efficiency and energy saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural diagram of the utility model;

[0023] Wherein: thermal oil boiler 1, steam generator 2, water storage tank 3, softening device 4, first soft water tank 5, second soft water tank 6, first temperature sensor 7, water jacket 11, insulation layer 12, first upper water level sensor 31, first lower water level sensor 32, second upper water level sensor 51, second lower water level sensor 52, third upper water level sensor 61, third lower water level sensor 62, water inlet pipe 10, water return pipe 20, thermal oil circulation pipe 30, tap water pipe 40, first water outlet pipe 50, second water outlet pipe 60, first water inlet pipe 70, third water outlet pipe 80, first pump body 1a, second pump body 2a, third pump body 3a, fourth pump body 4a, first valve 1b, second valve 2b, third valve 3b, fourth valve 4b. DETAILED DESCRIPTION

[0024] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be provided below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to facilitate a more thorough and comprehensive understanding of the disclosure of the present invention.

[0025] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," "upper," "lower," "front," "rear," and similar expressions used herein are for illustrative purposes only.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are intended only to describe specific embodiments and are not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0027] Below, the present invention is further described with reference to the accompanying drawings and specific embodiments:

[0028] like Figure 1 As shown, a boiler preheating and heat recovery system includes a thermal oil boiler 1, a steam generator 2, a water storage tank 3 and a water supply device. The thermal oil boiler 1 is provided with a water jacket 11 around its outer wall. The water inlet and water outlet of the water jacket 11 are respectively provided with a water inlet pipe 10 and a return pipe 20 connected to the water storage tank 3. The return pipe 20 is provided with a first pump body 1a.

[0029] The thermal oil boiler 1 is connected to the steam generator 2 via a thermal oil circulation pipe 30, and a second pump body 2a is provided on the thermal oil circulation pipe 30;

[0030] The water supply device includes a softening device 4, a first soft water tank 5 and a second soft water tank 6. The first soft water tank 5 is connected to the tap water pipe 40 through the softening device 4, the first soft water tank 5 is connected to the water storage tank 3 through a first water outlet pipe 50, and is connected to the water inlet of the steam generator 2 through a second water outlet pipe 60. The second soft water tank 6 is connected to the water storage tank 3 through a first water inlet pipe 70, and is connected to the water inlet of the steam generator 2 through a third water outlet pipe 80.

[0031] In this embodiment, the softening device 4 is used to prepare tap water into soft water. The structure and working principle of the softening device 4 are conventional technologies and will not be repeated here. The first soft water tank 5 is used to store soft water supplied to the steam generator 2 and the water storage tank 3. The second soft water tank 6 is used to store hot soft water supplied to the steam generator 2. The water storage tank 3 is used to store hot soft water formed by absorbing the heat of the boiler body.

[0032] In this embodiment, during normal operation, the first soft water tank 5 supplies soft water to the water storage tank 3 and the steam generator 2. The soft water entering the steam generator 2 is converted into steam after passing through the high-temperature thermal oil and discharged. The soft water entering the water storage tank 3 is circulated into the water jacket 11 under the action of the first pump body 1a to absorb heat from the boiler furnace. Thus, when the boiler switches from operation to shutdown, the heat from the boiler furnace can be recovered and converted into hot soft water to be stored in the water storage tank 3, or the excess water can be transported to the second soft water tank 6.

[0033] The hot soft water transported to the second soft water tank 6 can be used by the steam generator 2 to improve the steam output efficiency; and the hot soft water stored in the water storage tank 3 can be injected into the water jacket 11 before the next start of the boiler to preheat the boiler furnace body and improve the thermal efficiency of the boiler startup phase, saving energy, being efficient and reliable in operation.

[0034] Further, such as Figure 1 As shown, the first water outlet pipe 50 , the second water outlet pipe 60 , the first water inlet pipe 70 and the third water outlet pipe 80 are respectively provided with a first valve 1 b , a second valve 2 b , a third valve 3 b and a fourth valve 4 b .

[0035] In this embodiment, the first water outlet pipe 50 is controlled to be open and closed by the first valve 1b to control the delivery of soft water to the water storage tank 3; the second water outlet pipe 60 and the third water outlet pipe 80 are controlled to be open and closed by the second valve 2b and the fourth valve 4b respectively, thereby controlling the supply of hot soft water or soft water to the steam generator 2; and the three valves are used to control the passage of the first water inlet pipe 70 to control the hot soft water in the water storage tank 3 to enter the second soft water tank 6.

[0036] In this embodiment, when the boiler switches from operation to shutdown, the first valve 1b, the second valve 2b, the third valve 3b and the fourth valve 4b are closed. Under the action of the first pump body 1a, the water in the water storage tank 3 circulates into the water jacket 11 to absorb the heat of the boiler furnace body. When the hot soft water in the water storage tank 3 reaches the set temperature, the first pump body 1a stops and the third valve 3b opens, allowing the hot soft water in the water storage tank 3 to enter the second soft water tank 6. At the same time, the first valve 1b opens to inject room temperature soft water into the water storage tank 3. After the set amount is reached, the first valve 1b and the third valve 3b are closed, and the first pump body 1a is started. The above actions are repeated until the temperature of the boiler furnace body drops to the set temperature. At this time, the hot soft water in the water storage tank 3 is no longer discharged into the second soft water tank 6, but is stored and kept warm. Before the next start of the boiler, it is injected into the water jacket 11 to preheat the boiler furnace body.

[0037] Further, such as Figure 1 As shown, in order to improve the efficiency of soft water entering the water tank 3 and hot soft water discharging from the water tank 3 and improve system reliability, a third pump body 3a and a fourth pump body 4a are respectively provided on the first water outlet pipe 50 and the first water inlet pipe 70.

[0038] Further, such as Figure 1 As shown, in order to accurately detect the temperature of the soft water in the water tank 3, a first temperature sensor 7 for detecting the temperature of the hot soft water is provided on the water tank 3.

[0039] Further, such as Figure 1 As shown, a first upper water level sensor 31 and a first lower water level sensor 32 are provided in the water tank 3 .

[0040] In this embodiment, when the soft water level in the water storage tank 3 is higher than the first upper water level sensor 31, the third pump body 3a stops and the first valve 1b is closed. At this time, the soft water circulates in the water jacket 11 to absorb heat. After reaching the set temperature, the fourth pump body 4a is started, the third valve 3b is opened, and the hot soft water flows from the water storage tank 3 into the second soft water tank 6; when the hot soft water level in the water storage tank 3 is lower than the first lower water level sensor 32, the fourth pump body 4a stops, the third valve 3b is closed, the third pump body 3a is started, the first valve 1b is opened, and normal temperature soft water is injected into the water storage tank 3. Then the above actions are repeated, and the flow of hot soft water into the second soft water tank 6 and the flow of normal temperature soft water into the water storage tank 3 can be accurately controlled according to the temperature of the hot soft water.

[0041] Further, such as Figure 1 As shown, in order to accurately control the storage amount of soft water in the first soft water tank 5 and ensure the supply of soft water, a second upper water level sensor 51 and a second lower water level sensor 52 are provided in the first soft water tank 5 .

[0042] Further, such as Figure 1 As shown, a third upper water level sensor 61 and a third lower water level sensor 62 are provided in the second soft water tank 6 .

[0043] In this embodiment, when the water level of hot soft water in the second soft water tank 6 is higher than the third upper water level sensor 61, the fourth body stops, the third valve 3b is closed, the second valve 2b is closed, and the fourth valve 4b is opened. The hot soft water is supplied to the steam generator 2 to prepare steam, which is more efficient and energy-saving than preparing steam with normal temperature soft water. When the water level of hot soft water in the second soft water tank 6 is lower than the third lower water level sensor 62, when the soft water in the water storage tank 3 reaches the set temperature and is sufficient, the fourth body starts, the third valve 3b is opened, the fourth valve 4b is closed, and the second valve 2b is opened. At this time, the second soft water tank 6 is in a state of storing hot soft water, and the steam generator 2 is supplied with normal temperature soft water to work.

[0044] Further, such as Figure 1 As shown, the heat loss of the boiler is reduced and the energy consumption is lowered; the thermal oil boiler 1 is provided with an insulation layer 12 on the outside of the water jacket 11.

[0045] Furthermore, the heat preservation effect of hot soft water is improved, heat loss is reduced, and energy consumption is lowered; the water storage tank 3 and the second soft water tank 6 are boxes with heat preservation function.

[0046] Furthermore, the first valve 1b, the second valve 2b, the third valve 3b and the fourth valve 4b are solenoid valves.

[0047] In this embodiment, the solenoid valve has the advantages of fast response speed, good stability, strong controllability, etc., which greatly improves the on-off control stability of each pipeline.

[0048] For those skilled in the art, various other corresponding changes and deformations can be made based on the technical solutions and concepts described above, and all of these changes and deformations should fall within the scope of protection of the claims of this utility model patent.

Claims

1. A boiler preheating and heat recovery system, comprising a thermal oil boiler, a steam generator, a water storage tank and a water supply device, characterized in that: A water jacket is provided around the outer wall of the thermal oil boiler, and a water inlet and a water outlet of the water jacket are respectively provided with a water inlet pipe and a water return pipe connected to the water storage tank, and a first pump body is provided on the water return pipe; The thermal oil boiler is connected to the steam generator through a thermal oil circulation pipeline, and a second pump body is provided on the thermal oil circulation pipeline; The water supply device includes a softening device, a first soft water tank and a second soft water tank. The first soft water tank is connected to the tap water pipe through the softening device, the first soft water tank is connected to the water storage tank through a first water outlet pipe, and is connected to the water inlet of the steam generator through a second water outlet pipe. The second soft water tank is connected to the water storage tank through a first water inlet pipe, and is connected to the water inlet of the steam generator through a third water outlet pipe.

2. A boiler preheating and heat recovery system according to claim 1, characterized in that: The first water outlet pipe, the second water outlet pipe, the first water inlet pipe and the third water outlet pipe are respectively provided with a first valve, a second valve, a third valve and a fourth valve.

3. A boiler preheating and heat recovery system according to claim 1, characterized in that: The first water outlet pipe and the first water inlet pipe are respectively provided with a third pump body and a fourth pump body.

4. A boiler preheating and heat recovery system according to claim 1, characterized in that: The water storage tank is provided with a first temperature sensor for detecting the temperature of the hot soft water.

5. A boiler preheating and heat recovery system according to claim 4, characterized in that: A first upper water level sensor and a first lower water level sensor are arranged in the water storage tank.

6. A boiler preheating and heat recovery system according to claim 1, characterized in that: A second upper water level sensor and a second lower water level sensor are provided in the first soft water tank.

7. The boiler preheating and heat recovery system according to claim 1, characterized in that: A third upper water level sensor and a third lower water level sensor are provided in the second soft water tank.

8. The boiler preheating and heat recovery system according to claim 1, characterized in that: The thermal oil boiler is provided with a heat insulation layer on the outside of the water jacket.

9. The boiler preheating and heat recovery system according to claim 1, characterized in that: The water storage tank and the second soft water tank are boxes with heat preservation function.

10. A boiler preheating and heat recovery system according to claim 2, characterized in that: The first valve, the second valve, the third valve and the fourth valve are solenoid valves.

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