Boiler circulating water system

Abstract

The utility model belongs to the technical field of boiler energy conservation, and discloses a boiler circulating water system which comprises a boiler water pump, a circulating water system and a sealing water system, the sealing water system comprises a sealing water tank, and the sealing water tank is connected with a first sealing water pipeline; the sealing water cooler is communicated with the sealing water tank through a first sealing water pipeline, and the sealing water cooler is communicated with the mechanical sealing structure of the boiler water pump through the first sealing water pipeline; the flow adjusting assembly is arranged on the first sealing water pipeline; the second sealing water pipeline is used for conveying boiler water, and the second sealing water pipeline is communicated with the sealing water cooler; according to the scheme, through the first sealing water pipeline, high-pressure boiler water conveyed by the second sealing water pipeline is used as mechanical seal sealing water, and it is ensured that even if the pump does not operate, the sealing water can still keep flowing. The boiler circulating pump solves the problem that sealing water of a boiler circulating pump in the prior art does not flow.

Description

Technical Field

[0001] This solution belongs to the technical field of boiler energy conservation, and specifically relates to a boiler circulating water system. Background Art

[0002] In the boiler water circulation system, natural and forced circulation are key to ensuring safe and stable operation of the boiler and the Jinhua furnace water-wall drum. To this end, the system design incorporates a boiler water circulation pump and incorporates a low-flow boiler water shut-down interlock and a low-flow standby pump auto-start interlock to enhance production stability and safety.

[0003] Referring to the document with the existing publication (announcement) number CN111981455A, a forced recirculation water tube steam boiler system and its operation method are disclosed, including a float water extractor arranged in a water tank, the float water extractor is connected to the condenser through a boiler feed water pipe, a boiler feed water pump is connected in series to the boiler feed water pipe, the condenser is connected to a buffer level control tank through a water supply pipe, the buffer level control tank is connected to the water inlet of the boiler body through a high-temperature water supply pipe, a high-temperature circulation pump is connected in series to the high-temperature water supply pipe, the water inlet of the boiler body is connected to the burner disk and the furnace square coil, the furnace square coil is connected to the tail collecting box, the tail collecting box is connected to the fin-type downcomer economizer, the fin-type downcomer economizer is connected to the bottom collecting box, the bottom collecting box is connected to the furnace boiling riser, the furnace boiling riser is connected to the top collecting box, the steam-water mixed outlet of the top collecting box is connected to the steam-water separator through the steam-water mixing pipe, and the liquid outlet of the steam-water separator is connected to the buffer level control tank through a reflux pipe.

[0004] However, in the prior art, boiler water circulation pumps generally use self-sealing or high-pressure sealing water sealing to cool and lubricate the mechanical seals in the pump. However, when the circulating pump is in hot standby mode, the sealing water cannot flow, causing the water pressure in the circulating pump to reach about 7.5 MPa and the temperature to reach about 286°C. Such extreme conditions will cause the rubber O-ring of the mechanical seal to deform, and at the same time, scale will easily form on the mechanical seal. In severe cases, it may even cause the pump to be unable to start, resulting in seal failure and medium leakage, posing a risk of scalding. In addition, frequent leakage of mechanical seals requires constant switching and maintenance, which increases the workload of operators and maintenance personnel in high-temperature environments. In the maintenance state, if the boiler water circulation pump does not have a spare pump, once the operating pump fails, the gasifier will stop, thereby reducing the operational stability and safety of the entire system. These problems highlight the shortcomings of the existing technology in ensuring the long-term stable operation of the boiler water circulation pump. Utility Model Content

[0005] The purpose of this solution is to provide a boiler circulating water system to solve the problem of non-flow of sealing water in the boiler circulating pump in the prior art.

[0006] In order to achieve the above-mentioned object, the present invention provides a boiler circulating water system, including a boiler water pump and a circulating water system, and also includes a sealing water system, wherein the sealing water system includes:

[0007] A sealed water tank, wherein the sealed water tank is connected to a first sealed water pipeline;

[0008] A sealing water cooler, the sealing water cooler being in communication with the sealing water tank via a first sealing water pipeline, the sealing water cooler being in communication with the mechanical sealing structure of the boiler water pump via the first sealing water pipeline;

[0009] A flow regulating assembly, the flow regulating assembly being provided on the first sealing water pipeline and being used for regulating the flow of sealing water in the first sealing water pipeline;

[0010] A second sealing water pipeline is used to transmit boiler water, and the second sealing water pipeline is connected to the sealing water cooler.

[0011] The principle of this solution is to add a first sealing water pipeline and use the high-pressure boiler water transmitted by the second sealing water pipeline as the mechanical seal sealing water. Due to its high pressure, it can effectively maintain the pressure and temperature difference inside and outside the mechanical seal stable. And the flow rate of the sealing water is controlled by the flow regulating component, so that the sealing water flow rate is 0.3~0.5m 3 / h within the stable range.

[0012] The effects of this solution are: (1) By adding a first sealing water pipeline and using the high-pressure boiler water transmitted by the second sealing water pipeline as the mechanical seal sealing water, it is ensured that the sealing water can maintain flow even when the pump is not running, thereby effectively avoiding the deformation of the mechanical seal rubber O-ring and scale scaling caused by stagnation of sealing water. (2) Through the flow regulating component, the sealing water flow can be accurately controlled at 0.3~0.5m 3 / h, further ensuring the cooling of the mechanical seal, improving the utilization efficiency of the standby pump, and reducing the risk of gasifier shutdown due to pump failure, thereby ensuring the long-term stable operation of the entire boiler circulating water system.

[0013] Furthermore, the flow regulating assembly includes a first stop valve, a rotor flowmeter, a second stop valve, a first one-way valve, an exhaust valve, a third stop valve and a pressure gauge which are sequentially arranged on the first sealing water pipeline.

[0014] The principle and effect of this solution are as follows: the first stop valve, rotor flowmeter, second stop valve, first check valve, exhaust valve, third stop valve and pressure gauge are set to adjust and monitor the sealing water flow. The first and second stop valves allow the operator to cut off or restore the sealing water flow, and the rotor flowmeter reads the flow to ensure that the flow is maintained at 0.3-0.5m 3 / h setting range. The first one-way valve prevents reverse flow. Ultimately, the sealing water flow entering the mechanical seal is stabilized and enters the mechanical seal jacket symmetrically for seal cooling.

[0015] Furthermore, the flow regulating assembly also includes a flow limiting orifice plate provided on the first sealing water pipeline.

[0016] The principle and effect of this solution is to limit the sealing water flow by the aperture of the flow limiting orifice plate.

[0017] Furthermore, the circulating water system includes a circulating water supply system and a circulating water return system, and the circulating water supply system and the circulating water return system are connected.

[0018] The principle and effect of this solution is to realize water circulation between the water supply system and the return water system.

[0019] Furthermore, a connecting valve is provided on the pipeline connecting the circulating water supply system and the circulating water return system.

[0020] The principle and effect of this solution are: by setting a connecting valve on the connecting pipeline of the circulating water supply system and the circulating return water system, when the boiler load increases, the connecting valve can be opened to increase the circulating water volume to meet higher heat exchange requirements; and when the load decreases, the connecting valve can be appropriately closed to reduce the circulating water volume and avoid energy waste caused by excessive circulation.

[0021] Furthermore, the circulating water supply system includes a circulating water supply pipeline, on which a fourth stop valve, a fifth stop valve, a filter and a sixth stop valve are sequentially provided. The circulating water supply pipeline is connected to four branches, three of which are respectively connected to the support, pump cover and bearing box of the boiler water pump; and the other branch is connected to the sealed water cooler.

[0022] The principle and effect of this solution are as follows: (1) A series of control valves and filters are set up in the circulating water supply system, and the circulating water supply pipeline is connected to the key components of the boiler water pump and the sealing water cooler. The fourth and fifth stop valves can control or cut off the water flow, and the filter can intercept impurities and particles in the water to avoid clogging of sensitive components such as the boiler water pump and the sealing water cooler. (2) The four branches connected to the circulating water supply pipeline allow the support, pump cover and bearing box of the boiler water pump to be cooled, thereby improving the operating efficiency of the pump. One of the branches is directly connected to the sealing water cooler, which helps to maintain the flow of sealing water and avoid mechanical seal failure caused by stagnation of sealing water in the hot standby state.

[0023] Furthermore, each of the three branch pipes is provided with a seventh stop valve.

[0024] The principle and effect of this solution is that by arranging the seventh stop valve on each of the three branch pipes, independent water flow control is provided for the support, pump cover and bearing box of the boiler water pump.

[0025] Furthermore, the circulating return water system includes a circulating return water pipeline, which is respectively connected to the support circulating return water pipeline, the pump cover circulating return water pipeline, the bearing box circulating return water pipeline and the sealing water cooler circulating return water pipeline. The circulating return water pipeline is provided with an eighth stop valve and a ball valve, the sealing water cooler circulating return water pipeline is provided with a first return water sight glass, the support circulating return water pipeline is provided with a second return water sight glass, the pump cover circulating return water pipeline is provided with a third return water sight glass, and the bearing box circulating return water pipeline is provided with a fourth return water sight glass.

[0026] The principle and effect of this solution are as follows: (1) The circulating return water pipeline is connected to the support, pump cover, bearing housing and sealed water cooler respectively, so that these components can discharge the cooled water. (2) The eighth stop valve and ball valve are installed on the circulating return water pipeline to adjust the water flow according to the system requirements and optimize the cooling efficiency. (3) Each circulating return water pipeline is also equipped with sight glasses, including the first return water sight glass, the second return water sight glass, the third return water sight glass and the fourth return water sight glass. These sight glasses enable the operator to intuitively monitor the water flow status and water quality, and promptly detect and deal with possible blockage or contamination problems.

[0027] Furthermore, a circulating water return guide is provided on the circulating water return pipeline.

[0028] The principle and effect of this solution are: the function of setting up the circulating water return diversion is to provide water diversion during the return process of the circulating water system.

[0029] Furthermore, a ninth stop valve, a second one-way valve and a tenth stop valve are sequentially provided on the second sealing water pipeline.

[0030] The principle and effect of this solution are: the ninth stop valve, the second one-way valve and the tenth stop valve are sequentially arranged on the second sealing water pipeline to cut off or adjust the supply of sealing water. The second one-way valve ensures that the sealing water can only flow in one direction to avoid backflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a structural schematic diagram of a boiler circulating water system of the utility model.

[0032] The names of the corresponding marks in the accompanying drawings are: boiler water pump 1, circulating water system 2, circulating water supply system 21, fourth stop valve 211, fifth stop valve 212, filter 213, sixth stop valve 214, seventh stop valve 215, circulating return water system 22, eighth stop valve 221, first return water sight glass 222, second return water sight glass 223, third return water sight glass 224, fourth return water sight glass 225, ball valve 227, circulating water return water guide 226, connecting valve 228, sealing water system 3, sealing water tank 31, sealing water cooler 32, flow regulating assembly 33, first stop valve 331, rotor flowmeter 332, second stop valve 333, first one-way valve 334, exhaust valve 335, third stop valve 336, pressure gauge 337, flow limiting orifice 338, ninth stop valve 34, second one-way valve 35, tenth stop valve 36. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the concept and technical effects of the present invention in conjunction with the embodiments, so that the purpose, features and effects of the present invention can be fully understood. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention:

[0034] Example:

[0035] See also Figure 1A boiler circulating water system includes a boiler water pump 1, a circulating water system 2 and a sealing water system 3. The sealing water system 3 includes a sealing water tank 31, a sealing water cooler 32, a flow regulating component 33 and a second sealing water pipeline. The sealing water tank 31 is connected to the first sealing water pipeline. The sealing water cooler 32 is connected to the sealing water tank 31 through the first sealing water pipeline. The sealing water cooler 32 is connected to the mechanical seal structure of the boiler water pump 1 through the first sealing water pipeline. The flow regulating component 33 is provided on the first sealing water pipeline. The flow regulating component 33 is used to regulate the flow of sealing water in the first sealing water pipeline. The second sealing water pipeline is used to transmit boiler water. The second sealing water pipeline is connected to the sealing water cooler 32. The second sealing water pipeline is provided with a ninth stop valve 34, a second one-way valve 35 and a tenth stop valve 36 in sequence. The flow regulating assembly 33 includes a first stop valve 331, a rotor flow meter 332, a second stop valve 333, a first one-way valve 334, an exhaust valve 335, a third stop valve 336, a pressure gauge 337 and a flow limiting orifice 338, which are sequentially arranged on the first sealing water pipeline. The first stop valve 331, the rotor flow meter 332, the second stop valve 333, the first one-way valve 334, the exhaust valve 335, the third stop valve 336 and the pressure gauge 337 are arranged to regulate and monitor the sealing water flow. The first and second stop valves allow the operator to cut off or restore the sealing water flow, and the rotor flow meter 332 reads the flow to ensure that the flow is maintained at 0.3 to 0.5 m 3 The first one-way valve 331 prevents the sealing water from flowing in the opposite direction. This ultimately stabilizes the flow of sealing water entering the mechanical seal and allows the sealing water to enter the mechanical seal jacket symmetrically for cooling.

[0036] During operation, the boiler water pump 1 is initially started, and the high-pressure sealing water after heat exchange is used as the mechanical seal flushing water. The first stop valve 331 and the second stop valve 333 are opened, and the ninth stop valve 34 and the tenth stop valve 36 are closed. After the boiler water pump 1 is operating normally, the first stop valve 331 and the second stop valve 333 are closed, and the ninth stop valve 34 and the tenth stop valve 36 are opened, and the boiler water in the second sealing water pipeline is used as the mechanical seal sealing water. By adding the first sealing water pipeline and utilizing the high-pressure boiler water transmitted by the second sealing water pipeline as the mechanical seal sealing water, the sealing water can maintain flow even when the pump is not operating, thereby effectively avoiding the deformation and scaling of the mechanical seal rubber O-ring caused by stagnation of sealing water.

[0037] The circulating water system 2 includes a circulating water supply system 21 and a circulating water return system 22. The circulating water supply system 21 and the circulating water return system 22 are connected. A connecting valve 228 is provided on the pipeline connecting the circulating water supply system 21 and the circulating water return system 22 to realize water circulation between the circulating water supply system 21 and the circulating water return system 22. The circulating water supply system 21 includes a circulating water supply pipeline, which is sequentially provided with a fourth stop valve 211, a fifth stop valve 212, a filter 213, and a sixth stop valve 214. The circulating water supply pipeline is connected to four branch pipes, three of which are respectively connected to the support, pump cover, and bearing housing of the boiler water pump 1. The three branch pipes are each provided with a seventh stop valve 215. By providing the seventh stop valve 215 on each of the three branch pipes, independent water flow control is provided for the support, pump cover, and bearing housing of the boiler water pump 1; another branch pipe is connected to the seal water cooler 32. A series of control valves and filters 213 are provided in the circulating water supply system 21, and the circulating water supply pipeline is connected to the key components of the boiler water pump 1 and the sealing water cooler 32. The water flow can be controlled or cut off by the fourth stop valve 211 and the fifth stop valve 212. The filter 213 can intercept impurities and particles in the water to avoid clogging of sensitive components such as the boiler water pump 1 and the sealing water cooler. At the same time, the four branches connected to the circulating water supply pipeline allow the support, pump cover and bearing box of the boiler water pump 1 to be cooled, thereby improving the operating efficiency of the pump. One of the branches is directly connected to the sealing water cooler 32, which helps to maintain the flow of sealing water and avoid the problem of mechanical seal failure caused by stagnation of sealing water in the hot standby state.

[0038] The circulating return water system 22 includes a circulating return water pipeline, which is respectively connected to the support circulating return water pipeline, the pump cover circulating return water pipeline, the bearing box circulating return water pipeline and the sealed water cooler circulating return water pipeline. The circulating return water pipeline is provided with an eighth stop valve 221 and a ball valve 227. The sealed water cooler circulating return water pipeline is provided with a first return water sight glass 222, the support circulating return water pipeline is provided with a second return water sight glass 223, the pump cover circulating return water pipeline is provided with a third return water sight glass 224, and the bearing box circulating return water pipeline is provided with a fourth return water sight glass 225. The circulating return water pipeline is provided with a circulating water return guide 226. The circulating return water pipeline is respectively connected to the support, pump cover, bearing box and sealed water cooler 32, so that these components can discharge cooled water. The circulating return water pipeline is provided with an eighth stop valve 221 and a ball valve 227 to adjust the water flow according to system requirements and optimize cooling efficiency. Each circulating return water pipeline is also equipped with a sight glass to facilitate intuitive monitoring of water flow status and water quality, and to promptly detect and deal with possible blockage or pollution problems.

[0039] The above is only an embodiment of the present invention, and the commonly known specific structures and characteristics of the scheme are not described in detail here. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, and these should also be regarded as the scope of protection of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection claimed by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A boiler circulating water system, comprising a boiler water pump (1) and a circulating water system (2), characterized in that: It also includes a sealing water system (3), which includes: A sealed water tank (31), wherein the sealed water tank (31) is connected to a first sealed water pipeline; A sealing water cooler (32), the sealing water cooler (32) being in communication with the sealing water tank (31) via a first sealing water pipeline, and the sealing water cooler (32) being in communication with the mechanical sealing structure of the boiler water pump (1) via the first sealing water pipeline; A flow regulating component (33), the flow regulating component (33) being provided on the first sealing water pipeline, the flow regulating component (33) being used to regulate the flow of sealing water in the first sealing water pipeline; A second sealing water pipeline is used to transmit boiler water, and the second sealing water pipeline is connected to a sealing water cooler (32).

2. A boiler circulating water system according to claim 1, characterized in that: The flow regulating assembly (33) comprises a first stop valve (331), a rotor flowmeter (332), a second stop valve (333), a first one-way valve (334), an exhaust valve (335), a third stop valve (336) and a pressure gauge (337) which are sequentially arranged on the first sealing water pipeline.

3. A boiler circulating water system according to claim 2, characterized in that: The flow regulating assembly (33) further includes a flow limiting orifice (338) provided on the first sealing water pipeline.

4. A boiler circulating water system according to claim 1, characterized in that: The circulating water system (2) comprises a circulating water supply system (21) and a circulating water return system (22), and the circulating water supply system (21) and the circulating water return system (22) are connected.

5. A boiler circulating water system according to claim 4, characterized in that: A connecting valve (228) is provided on the pipeline connecting the circulating water supply system (21) and the circulating water return system (22).

6. A boiler circulating water system according to claim 4, characterized in that: The circulating water supply system (21) comprises a circulating water supply pipeline, on which a fourth stop valve (211), a fifth stop valve (212), a filter (213) and a sixth stop valve (214) are sequentially provided. The circulating water supply pipeline is connected to four branch pipes, three of which are respectively connected to the support, pump cover and bearing box of the boiler water pump (1); and the other branch pipe is connected to the sealing water cooler (32).

7. A boiler circulating water system according to claim 6, characterized in that: The three branch pipes are each provided with a seventh stop valve (215).

8. A boiler circulating water system according to claim 4, characterized in that: The circulating water return system (22) comprises a circulating water return pipeline, which is respectively connected to a support circulating water return pipeline, a pump cover circulating water return pipeline, a bearing box circulating water return pipeline and a sealing water cooler circulating water return pipeline. An eighth stop valve (221) and a ball valve (227) are provided on the circulating water return pipeline. A first return water sight glass (222) is provided on the sealing water cooler circulating water return pipeline, a second return water sight glass (223) is provided on the support circulating water return pipeline, a third return water sight glass (224) is provided on the pump cover circulating water return pipeline, and a fourth return water sight glass (225) is provided on the bearing box circulating water return pipeline.

9. A boiler circulating water system according to claim 8, characterized in that: The circulating water return pipeline is provided with a circulating water return guide (226).

10. The boiler circulating water system according to claim 1, characterized in that: The second sealing water pipeline is provided with a ninth stop valve (34), a second one-way valve (35) and a tenth stop valve (36) in sequence.

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