Waste heat boiler water supply system

Abstract

The utility model discloses a waste heat boiler water supply system, which relates to the technical field of boiler water supply, and comprises a condensate water tank, a desalting water tank and a thermal deaerator, the output end of the condensate water tank is connected with the input end of a first water supply pipeline, the output end of the first water supply pipeline is connected with the input end of the demineralized water tank and the input end of the thermal deaerator, and the output end of the demineralized water tank is connected with the input end of a second water supply pipeline. And the output end of the second water supply pipeline is connected with the input end of the thermal deaerator. In the using process, condensate water is conveyed to the thermal deaerator through the first water supply pipeline, when the conveying amount of the condensate water is large, the first water supply pipeline conveys the condensate water to the demineralized water tank, when the conveying amount of the condensate water is insufficient, the second water supply pipeline conveys demineralized water to the thermal deaerator, waste of high-quality water resources is avoided, and meanwhile the energy consumption is reduced. Normal water supply of the waste heat boiler cannot be affected by the large or small output of the condensate water.

Description

Technical Field

[0001] The present application relates to the technical field of boiler water supply, and in particular to a waste heat boiler water supply system. Background Art

[0002] Ionic liquid circulating absorption flue gas desulfurization uses ionic liquid as absorbent, which has good absorption and desorption capacity for sulfur dioxide gas. The high-purity sulfur dioxide gas produced by absorbent regeneration is an excellent raw material for liquid sulfur dioxide, sulfuric acid, sulfur and other sulfur chemical products, with high recovery value and good market prospects.

[0003] Steam is often used for heating and regeneration in the ionic liquid desulfurization circulation system, which results in a large amount of high-temperature steam condensate during the production process. This part of condensate is of high quality. If it is not recycled, it will cause a waste of high-quality water resources. The waste heat boiler for acid conversion of copper smelting flue gas uses desalted water as supply. Before the desalted water is supplied to the waste heat boiler to produce steam, it must first be sent to the thermal deaerator for heating and deoxygenation. If the high-quality condensate generated by the ionic liquid desulfurization circulation system is transported to the thermal deaerator, the waste of high-quality water resources will be effectively solved. Utility Model Content

[0004] The main purpose of this application is to provide a waste heat boiler water supply system, aiming to solve or partially solve the above-mentioned technical problems.

[0005] To achieve the above objectives, this application provides the following technical solutions:

[0006] A waste heat boiler water supply system comprises: a condensate water tank, a desalted water tank and a thermal deaerator; the output end of the condensate water tank is connected to the input end of a first water supply pipeline, the output end of the first water supply pipeline is respectively connected to the desalted water tank and the input end of the thermal deaerator, the output end of the desalted water tank is connected to the input end of a second water supply pipeline, and the output end of the second water supply pipeline is connected to the input end of the thermal deaerator.

[0007] As a further improvement of the present application, the first water supply pipeline includes a first main pipe connected to the condensate water tank at one end, the other end of the first main pipe is respectively connected to one end of the first branch pipe and the second branch pipe through a three-way valve, the other end of the first branch pipe is connected to the thermal deaerator, and the other end of the second branch pipe is connected to the desalted water tank; the second water supply pipeline includes a second main pipe connected to the desalted water tank at one end, and the other end of the second main pipe is connected to the thermal deaerator.

[0008] As a further improvement of the present application, the first water supply pipeline also includes a first pump body and a first pipeline valve arranged on the first main pipe, and a check valve arranged on the first branch pipe, and the first pipeline valve is arranged on the side of the first pump body adjacent to the three-way valve; the second water supply pipeline also includes a second pump body and a second pipeline valve, and the second pipeline valve is arranged on the side of the second pump body adjacent to the thermal deaerator.

[0009] As a further improvement of the present application, the waste heat boiler water supply system also includes a controller electrically connected to the three-way valve, the first pipeline valve, the second pipeline valve, the first pump body and the second pump body, respectively, and the controller pre-stores a plurality of control instructions, and the controller is used to match the corresponding control instructions to respectively control the three-way valve to select the conduction direction, the first pipeline valve and the second pipeline valve to open or close, and the first pump body and the second pump body to do work.

[0010] As a further improvement of the present application, the waste heat boiler water supply system also includes a liquid level detector electrically connected to the controller, the liquid level detector is arranged in the thermal deaerator, and the liquid level detector is used to monitor the liquid level in the liquid level detector in real time.

[0011] As a further improvement of the present application, the waste heat boiler water supply system also includes a first threshold and a second threshold. The controller receives data from the liquid level detector, matches the corresponding control instructions to calculate and analyze the data, and compares it with the first threshold and the second threshold to determine the delivery amount of condensed water.

[0012] The technical solution provided by this application may have the following beneficial effects:

[0013] When the present application is in use, the water output by the thermal deaerator is supplied to the waste heat boiler, the first main pipe is connected to the first branch pipe, and the first pump body works to transport the condensed water to the thermal deaerator; when the amount of condensed water transported to the thermal deaerator is greater than the first threshold value, the first main pipe is connected to the second branch pipe, and the condensed water is transported to the desalted water tank for storage; when the amount of condensed water transported to the thermal deaerator is between the first threshold value and the second threshold value, the first main pipe is connected to the first branch pipe, and the condensed water is transported normally; when the amount of condensed water transported to the thermal deaerator is lower than the second threshold value, the first main pipe is connected to the first branch pipe while the second main pipe is connected, and the first pump body and the second pump body work at the same time, while transporting condensed water to the thermal deaerator, the desalted water is also transported to the thermal deaerator, so that the output of the thermal deaerator is kept in a stable state. In this way, the condensed water generated by the ionic liquid desulfurization circulation system is supplied to the waste heat boiler, avoiding the waste of high-quality water resources, and the normal water supply of the waste heat boiler will not be affected by the output of the condensed water, whether it is more or less. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The above and other objects, features and advantages of the present application will become more apparent through a more detailed description of exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.

[0015] Figure 1 A schematic diagram of the structure of a waste heat boiler water supply system Figure 1 ;

[0016] Figure 2 A structural diagram of a waste heat boiler water supply system Figure 2 ;

[0017] Reference numerals:

[0018] 1. Condensate tank; 2. Desalted water tank; 3. Thermal deaerator; 4. First water supply pipeline; 41. First main pipe; 42. Three-way valve; 43. First branch pipe; 44. Second branch pipe; 45. First pump body; 46. First pipeline valve; 47. Check valve; 5. Second water supply pipeline; 51. Second main pipe; 52. Second pump body; 53. Second pipeline valve; 6. Liquid level detector. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0020] Figure 1 An embodiment of a waste heat boiler water supply system of the present application is shown, see Figure 1 In this embodiment, the waste heat boiler water supply system includes: a condensate tank 1, a desalted water tank 2 and a thermal deaerator 3.

[0021] Among them, see Figure 1 The condensate tank 1 stores condensate, the desalted water tank 2 stores non-salted water, the output end of the condensate tank 1 is connected to the desalted water tank 2 and the input end of the thermal deaerator 3 respectively, the input end of the thermal deaerator 3 is also connected to the input end of the desalted water tank 2, the output end of the thermal deaerator 3 is connected to the input end of the waste heat boiler, and the thermal deaerator 3 removes oxygen from the water and then transports it to the waste heat boiler to generate steam.

[0022] It should be noted that the condensate tank 1 stores condensate generated from the ionic liquid desulfurization circulation system, and the temperature of the condensate is 110°C; desalted water is the finished water obtained by removing suspended matter, colloids and inorganic cations, anions and other impurities in water by various water treatment processes, and the temperature of the desalted water is [30°C, 40°C]. The desalted water must be sent to the thermal deaerator 3, and steam is introduced into the deaerator to heat it to [100°C, 104°C], and only after the oxygen in the water is removed can it be sent to the waste heat boiler to produce steam.

[0023] To further illustrate, this embodiment focuses on the working principle of the deaerator, and the specific structure of the deaerator is not the focus of this embodiment and is the prior art, so this embodiment will not repeat the specific structure of the deaerator.

[0024] Specifically, see Figure 1 The waste heat boiler water supply system also includes a first water supply pipeline 4 and a second water supply pipeline 5; one end of the first water supply pipeline 4 is connected to the condensate tank 1, and the other end of the first water supply pipeline 4 is respectively connected to the desalted water tank 2 and the thermal deaerator 3; one end of the second water supply pipeline 5 is connected to the desalted water tank 2, and the other end of the second water supply pipeline 5 is connected to the thermal deaerator 3.

[0025] Furthermore, the first water supply pipeline 4 is provided with a first main pipe 41, a three-way valve 42, a first branch pipe 43 and a second branch pipe 44; one end of the first main pipe 41 is connected to the condensate water tank 1, and the other end of the first main pipe 41 is respectively connected to one end of the first branch pipe 43 and the second branch pipe 44 through the three-way valve 42, the other end of the first branch pipe 43 is connected to the thermal deaerator 3, and the other end of the second branch pipe 44 is connected to the desalted water tank 2. When the three-way valve 42 connects the first main pipe 41 and the first branch pipe 43, condensate water is transported to the thermal deaerator 3, and when the three-way valve 42 connects the first main pipe 41 and the second branch pipe 44, condensate water is transported to the desalted water tank 2.

[0026] Furthermore, the first water supply pipeline 4 is also provided with a first pump body 45 and a first pipeline valve 46; the first pump body 45 and the first pipeline valve 46 are both arranged on the first main pipe 41, and the first pipeline valve 46 is located on the side of the first pump body 45 adjacent to the three-way valve 42. The first pump body 45 works to transport condensed water to the desalted water tank 2 or the thermal deaerator 3. The first pipeline valve 46 is used when there is no need to transport condensed water, and the first water supply pipeline 4 is in a cut-off state.

[0027] Furthermore, the first water supply pipeline 4 is also provided with a check valve 47, which is arranged on the first branch pipe 43. The check valve 47 can be connected from the first main pipe 41 to the thermal deaerator 3 to prevent the water in the thermal deaerator 3 or the second water supply pipeline 5 from flowing back into the first water supply pipeline 4 when the condensate delivery rate is low.

[0028] It should be noted that the three-way valve 42 is initially in a state where the first main pipe 41 is connected to the first branch pipe 43 , and the first pump body 45 and the first pipeline valve 46 are initially in a closed state.

[0029] Furthermore, the second water supply pipeline 5 is provided with a second main pipe 51, a second pump body 52 and a second pipeline valve 53; one end of the second main pipe 51 is connected to the desalted water tank 2, and the other end of the second main pipe 51 is connected to the thermal deaerator 3. The second pump body 52 and the second pipeline valve 53 are both arranged on the second main pipe 51, and the second pipeline valve 53 is arranged on the side of the second pump body 52 adjacent to the thermal deaerator 3. The second pump body 52 works to transport the desalted water to the thermal deaerator 3, and the second pipeline valve 53 is used when the desalted water does not need to be transported, and the second water supply pipeline 5 is in a cut-off state.

[0030] It should be noted that the initial state of the second pipeline valve 53 is closed.

[0031] Further, see Figure 1 The waste heat boiler water supply system also includes a liquid level detector 6 arranged in the thermal deaerator 3, and the liquid level detector 6 is used to detect the liquid level height in the thermal deaerator 3.

[0032] Furthermore, the waste heat boiler water supply system is provided with a first threshold and a second threshold, the value of the first threshold is higher than the second threshold, and the liquid level detector 6 monitors the liquid level in the thermal deaerator 3 in real time. The actual liquid level is compared with the first threshold and the second threshold to determine the delivery amount of condensed water.

[0033] Preferably, in this embodiment, the first threshold is higher than the second threshold, the first threshold is 800 mm, and the second threshold is 500 mm.

[0034] When the water supply system provided in this embodiment is used, the three-way valve 42 is controlled to connect the first main pipe 41 to the first branch pipe 43, the first pipeline valve 46 is controlled to be opened, and the second pipeline valve 53 is closed, the first pump body 45 works to continuously deliver condensed water to the thermal deaerator 3, and at the same time, the liquid level detector 6 detects the actual liquid level in the thermal deaerator 3 in real time. When the actual liquid level is higher than 800mm, it means that the condensed water delivery amount is large, and the three-way valve 42 is controlled to connect the first main pipe 41 to the second branch pipe 44 to deliver the condensed water to the desalted water tank 2 for storage. When the actual liquid level is in the range of 500-800mm, it means that the condensed water delivery amount is in a controllable range, and the three-way valve 42, the first pipeline valve 46 and the second pipeline valve 53 are all maintained in their original state. When the actual liquid level is lower than 500 mm, it indicates that the delivery volume of condensed water is low and the normal water supply to the waste heat boiler cannot be guaranteed. The three-way valve 42 is controlled to connect the first main pipe 41 to the first branch pipe 43, and the first pipeline valve 46 and the second pipeline valve 53 are opened. The second pump body 52 is controlled to work to deliver desalted water to the thermal deaerator 3 to ensure normal water supply to the waste heat boiler. The first pump body 45 is controlled to work to continue delivering condensed water to the thermal deaerator 3. When the actual liquid level in the thermal deaerator 3 exceeds 500 mm, the second pipeline valve 53 and the second pump body 52 are controlled to close.

[0035] Further, see Figure 1 The waste heat boiler water supply system also includes a controller, which is electrically connected to the three-way valve 42, the first pump body 45, the first pipeline valve 46, the second pump body 52, the second pipeline valve 53, and the liquid level detector 6 respectively. The controller pre-stores a number of control instructions. The controller receives a signal from the liquid level detection and matches the corresponding control instructions to respectively control the three-way valve 42 to select the conduction direction, the first pipeline valve 46 and the second pipeline valve 53 to open or close, and the first pump body 45 and the second pump body 52 to do work.

[0036] It should be noted that this embodiment focuses on the control principle of the controller. The specific structure of the controller is not the focus of this embodiment and is a prior art. This embodiment will not repeat the specific structure of the controller.

[0037] Similarly, the present embodiment focuses on the working principles of the three-way valve 42, the first pump body 45, the first pipeline valve 46, the second pump body 52, the second pipeline valve 53, and the liquid level detector 6. The specific structures of the three-way valve 42, the first pump body 45, the first pipeline valve 46, the second pump body 52, the second pipeline valve 53, and the liquid level detector 6 are not the focus of the present embodiment and are prior art. The present embodiment no longer repeats the specific structures of the three-way valve 42, the first pump body 45, the first pipeline valve 46, the second pump body 52, the second pipeline valve 53, and the liquid level detector 6.

[0038] In this embodiment, when the water supply system delivers condensed water to the waste heat boiler, the controller matches the corresponding control instructions, controls the three-way valve 42 to make the first main pipe 41 conduct to the first branch pipe 43, the first pipeline valve 46 is opened, and the second pipeline valve 53 is closed, and controls the first pump body 45 to work to deliver the condensed water to the thermal deaerator 3; at the same time, the controller receives the signal from the liquid level detector 6, matches the corresponding control instructions to process the signal, and compares it with the first threshold value and the second threshold value. When the actual liquid level is higher than the first threshold value, the delivery amount of condensed water is large, and the controller matches the corresponding control instructions, controls the three-way valve 42 to make the first main pipe 41 conduct to the second branch pipe 44, and delivers the excess condensed water to the desalted water tank 2 for storage. When the actual liquid level is between the first threshold value and the second threshold value, the delivery amount of condensed water is within the controllable range, controls the three-way valve 42 to make the first main pipe 41 conduct to the first branch pipe 43, the first pipeline valve 46 is opened, and the second pipeline valve 53 is closed, and the condensed water is normally delivered to the thermal deaerator 3. When the actual liquid level is lower than the second threshold, the delivery volume of condensed water is small, and the controller matches the corresponding control instructions, controls the three-way valve 42 to make the first main pipe 41 conduct to the first branch pipe 43, and the first pipeline valve 46 and the second pipeline valve 53 are both opened, and the first pump body 45 and the second pump body 52 are controlled to work at the same time, and the desalted water is delivered to the thermal deaerator 3 while delivering condensed water to the thermal deaerator 3 to ensure the normal water supply of the waste heat boiler. In the above manner, the condensed water generated in the ionic liquid desulfurization circulation system is delivered to the waste heat boiler, avoiding the waste of high-quality water resources, and no matter how much or how little the condensed water output is, it will not affect the normal water supply of the waste heat boiler.

[0039] In the above process, the temperature of the condensed water generated in the ionic liquid desulfurization circulation system is 110°C, and no deoxygenation operation is required; since the thermal deaerator 3 is heated by steam generated by the waste heat boiler, there is no need to consume steam from the waste heat boiler when transporting condensed water to the thermal deaerator 3, thereby avoiding the waste of high-quality water resources, reducing the steam consumption of the deaerator, and increasing the steam output of the waste heat boiler.

[0040] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A waste heat boiler water supply system, characterized in that: include: Condensate tank, desalted water tank and thermal deaerator; the output end of the condensate tank is connected to the input end of the first water supply pipeline, the output end of the first water supply pipeline is connected to the desalted water tank and the input end of the thermal deaerator respectively, the output end of the desalted water tank is connected to the input end of the second water supply pipeline, and the output end of the second water supply pipeline is connected to the input end of the thermal deaerator.

2. The waste heat boiler water supply system according to claim 1, characterized in that: The first water supply pipeline includes a first main pipe connected to the condensate water tank at one end, the other end of the first main pipe is respectively connected to one end of the first branch pipe and the second branch pipe through a three-way valve, the other end of the first branch pipe is connected to the thermal deaerator, and the other end of the second branch pipe is connected to the desalted water tank; the second water supply pipeline includes a second main pipe connected to the desalted water tank at one end, and the other end of the second main pipe is connected to the thermal deaerator.

3. The waste heat boiler water supply system according to claim 2, characterized in that: The first water supply pipeline also includes a first pump body and a first pipeline valve arranged on the first main pipe, and a check valve arranged on the first branch pipe, and the first pipeline valve is arranged on the side of the first pump body adjacent to the three-way valve; the second water supply pipeline also includes a second pump body and a second pipeline valve, and the second pipeline valve is arranged on the side of the second pump body adjacent to the thermal deaerator.

4. The waste heat boiler water supply system according to claim 3, characterized in that: It also includes a controller electrically connected to the three-way valve, the first pipeline valve, the second pipeline valve, the first pump body and the second pump body respectively, and the controller pre-stores a plurality of control instructions. The controller is used to receive external instructions to respectively control the conduction direction of the three-way valve, the opening state of the first pipeline valve and the second pipeline valve, and the work of the first pump body and the second pump body.

5. The waste heat boiler water supply system according to claim 4, characterized in that: It also includes a liquid level detector electrically connected to the controller, wherein the liquid level detector is disposed in the thermal deaerator and is used to monitor the liquid level in the liquid level detector in real time.

6. The waste heat boiler water supply system according to claim 5, characterized in that: It also includes a first threshold and a second threshold, where the first threshold and the second threshold are used for comparison with the data detected by the liquid level detector.

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