Boiler drum water supply device

Abstract

The utility model relates to the technical field of boilers, in particular to a boiler drum water supply device, which is characterized in that a boiler drum is arranged on a boiler body, a soft water pipeline is fixedly communicated between a liquid outlet of a soft water tank and a first liquid inlet at the upper part of a deaerator, and a soft water pump is fixedly mounted on the soft water pipeline; a deoxygenated water pipeline is fixedly communicated between a liquid outlet in the bottom of the deaerator and a liquid inlet of the boiler drum, a deoxygenated water pump is fixedly installed on the deoxygenated water pipeline, and a boiler water supply bypass pipeline is fixedly communicated between the deoxygenated water pipeline between the deoxygenated water pump and the boiler drum and a second liquid inlet in the upper portion of the deaerator. The energy-saving device is simple, reasonable and compact in structure and convenient to use, the potential energy of high-temperature and high-pressure steam and water is converted into kinetic energy for high-speed operation, the water supply amount of the boiler can be well controlled, the scouring degree of the high-temperature and high-pressure water to the valve can be effectively reduced, the daily operation and maintenance cost is reduced, and the energy-saving device has the advantages of being safe, labor-saving, simple, convenient and efficient.

Description

Technical Field

[0001] The utility model relates to the technical field of boilers and relates to a boiler drum water supply device. Background Art

[0002] The acid-making unit is a process of sulfur production with hydrogen sulfide, with an annual output of 150,000 tons of 93% concentrated sulfuric acid. The main function of the boiler section is to cool, wash and remove impurities from the sulfur dioxide flue gas generated by the combustion of sulfur and hydrogen sulfide. The sulfur dioxide flue gas generated in the combustion furnace enters the boiler section, and after being cooled by the boiler coil, the flue gas is sent to the high-efficiency scrubber. The boiler of the sulfur production process with hydrogen sulfide is a waste heat boiler. Part of the water in the desalted water is pumped into the boiler drum to supply water to the boiler body, and the other part flows back to the deaerator through the bypass system, which plays a role in regulating the water supply to the boiler.

[0003] Whether the water supply of the boiler body can be normally controlled depends on whether the boiler bypass system operates normally. During operation, the water supply of the boiler is adjusted by bypass. Since the medium in the pipeline is high-temperature and high-pressure water and steam, the valves used in the boiler water supply bypass system will be damaged and fail in a short period of time due to the erosion of high-temperature and high-pressure media (0.5MPa, 101℃), and the valves usually need to be stopped and replaced every 45 days.

[0004] The biggest risk of valve failure in the bypass system is that after the valve fails, most of the boiler feed water will flow back to the deaerator through the bypass, resulting in a reduction in boiler water supply and insufficient water supply. In severe cases, dry boilers and explosions may occur.

[0005] Stopping the plant to replace valves has the following disadvantages: it increases the workload of maintenance personnel; there are operational safety risks during valve replacement, as the pipeline contains high-temperature and high-pressure water, and there is a risk of high-temperature scalding at the work site; it increases the cost of replacing valves; it is not conducive to the "safe, stable, long-term, full and excellent" operation of the production unit, and has a great impact on production safety. Summary of the invention

[0006] The utility model provides a boiler drum water supply device, which overcomes the deficiencies of the above-mentioned prior art and can effectively solve the problems existing in the prior boiler water supply, such as difficulty in controlling the water supply pressure due to the influence of water temperature, drum pressure, etc., short valve service life, high daily maintenance cost and high safety risk.

[0007] The technical scheme of the utility model is realized through the following measures: a boiler drum water supply device comprises a boiler body, a two-stage throttling device, a soft water tank and a deaerator, a boiler drum is arranged on the boiler body, a soft water pipeline is fixedly connected between the liquid outlet of the soft water tank and the first liquid inlet on the upper part of the deaerator, a soft water pump is fixedly installed on the soft water pipeline, a deoxygenated water pipeline is fixedly connected between the liquid outlet at the bottom of the deaerator and the liquid inlet of the boiler drum, a deoxygenated water pump is fixedly installed on the deoxygenated soft water pipeline, a boiler feed water bypass pipeline is fixedly connected between the deoxygenated water pipeline between the deoxygenated water pump and the boiler drum and the second liquid inlet on the upper part of the deaerator, and a two-stage throttling device, a throttling valve and a stop valve are fixedly installed on the boiler feed water bypass pipeline in sequence along the medium flow direction.

[0008] The following are further optimizations and / or improvements to the above utility model technical solution:

[0009] The stage throttling device comprises a primary casing and a secondary casing, both of which are provided with orifice tubes, and both the top and bottom ends of the primary casing and the secondary casing are provided with drainage holes.

[0010] The diameter of the hydrophobic hole is 5 mm to 6 mm.

[0011] The above-mentioned two-stage throttling device, throttling valve and stop valve are all made of Q235B material of high temperature resistant system.

[0012] The above also includes a controller. The deaerator is provided with a temperature detector and a liquid level detector. The soft water pump, the deaerator water pump, the throttle valve, the temperature detector and the liquid level detector are all electrically connected to the controller.

[0013] A boiler water inlet flow meter is fixedly installed on the deoxygenated water pipeline between the boiler drum and the boiler feed water bypass pipeline, and the boiler water inlet flow meter is electrically connected to the controller.

[0014] The utility model has a simple, reasonable and compact structure and is easy to use. It converts the potential energy of high-temperature and high-pressure steam and water into kinetic energy for high-speed operation, which can well control the water supply of the boiler and effectively reduce the degree of scouring of the valve by high-temperature and high-pressure water, thereby reducing the daily operation and maintenance costs. It is safe, labor-saving, simple and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Attached Figure 1 This is a schematic diagram of the process flow of the utility model.

[0016] Attached Figure 2 For attachment Figure 1 A partial enlarged schematic diagram of the medium two-stage throttling device.

[0017] Attached Figure 1The codes are: 1 for boiler body, 2 for two-stage throttling device, 3 for soft water tank, 4 for deaerator, 5 for boiler drum, 6 for soft water pipeline, 7 for soft water pump, 8 for deaerated water pipeline, 9 for deaerated water pump, 10 for boiler feed water bypass pipeline, 11 for throttling valve, 12 for stop valve, 13 for primary casing, 14 for secondary casing, 15 for orifice tube, 16 for temperature detector, 17 for boiler inlet flowmeter, 18 for liquid level detector, and 19 for drain hole. DETAILED DESCRIPTION

[0018] The present invention is not limited by the following embodiments, and specific implementation methods can be determined according to the technical solution of the present invention and actual conditions.

[0019] In the present invention, unless otherwise specified, the equipment and devices used are all the equipment and devices known and used in the art.

[0020] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached manual. Figure 1 The layout is described in detail, such as the positional relationship of front, back, top, bottom, left, right, etc., which is based on the attached manual. Figure 1 The layout direction is determined by the

[0021] The present invention is further described below in conjunction with the embodiments and drawings:

[0022] Embodiment 1: As attached Figure 1 , 2 As shown, the boiler drum water supply device comprises a boiler body 1, a two-stage throttling device 2, a soft water tank 3 and a deaerator 4. A boiler drum 5 is arranged on the boiler body 1. A soft water pipeline 6 is fixedly connected between the liquid outlet of the soft water tank 3 and the first liquid inlet on the upper part of the deaerator 4. A soft water pump 7 is fixedly installed on the soft water pipeline 6. A deoxygenated water pipeline 8 is fixedly connected between the liquid outlet at the bottom of the deaerator 4 and the liquid inlet of the boiler drum 5. A deoxygenated water pump 9 is fixedly installed on the deoxygenated soft water pipeline 6. A boiler feed water bypass pipeline 10 is fixedly connected between the deoxygenated water pump 9 and the boiler drum 5 and the second liquid inlet on the upper part of the deaerator 4. The two-stage throttling device 2, a throttle valve 11 and a stop valve 12 are fixedly installed on the boiler feed water bypass pipeline 10 in sequence along the flow direction of the medium.

[0023] The utility model adopts a unique throttling method of a double-stage throttling device 2 + throttle valve 11 + stop valve 12 for boiler water supply, which can well control the boiler water supply, and can also effectively reduce the degree of scouring of the valve by high-temperature and high-pressure water, thereby reducing daily operation and maintenance costs.

[0024] The above boiler drum water supply device can be further optimized and / or improved according to actual needs:

[0025] Embodiment 2: It is different from Embodiment 1 in that: Figure 1 , 2 As shown, the two-stage throttling device 2 includes a primary casing 13 and a secondary casing 14 , each of which is provided with a hole tube 15 , and each of the top and bottom ends of the primary casing 13 and the secondary casing 14 is provided with a drain hole 19 .

[0026] According to the needs, the double-stage throttling device 2 in the utility model is arranged on the boiler feed water bypass pipeline 10 after the deaeration water pump 9, which serves the purpose of reducing pressure and throttling the boiler water supply, thereby protecting the normal boiler water supply and reducing the flushing force of the valve group.

[0027] Through the orifice tube 15 provided in the primary casing 13 and the secondary casing 14, the two-stage throttling device 2 can convert the potential energy of the high-temperature and high-pressure water in the pipeline into the kinetic energy of the high-speed rotation of the orifice tube 15 in the propulsion casing, thereby reducing the pressure and reducing the flushing effect on the subsequent throttle valve 11 and the stop valve 12. Among them, the trajectory of the high-temperature and high-pressure water and steam in the two-stage throttling device 2 is as follows: the high-temperature and high-pressure steam and water enter the orifice tube 15 through the primary casing 13, pass through the inner diameter of the primary orifice tube 15, enter the secondary casing 14 through the drain hole 19 of the secondary casing 14, pass through the inner diameter of the secondary orifice tube 15, flow out from the drain hole 19 at the lower end of the secondary casing 14, and then enter the regulating valve and the stop valve 12 in sequence. Due to the asymmetry of the positions of the hydrophobic holes 19 of the primary casing 13 and the secondary casing 14 and the holes of the orifice tube 15, after the high-temperature and high-pressure fluid enters, the orifice tube 15 will rotate at high speed inside the primary casing 13 and the secondary casing 14, realizing the conversion of potential energy into kinetic energy and reducing the pressure.

[0028] As required, the two-stage throttling device 2 can also be designed as a multi-stage throttling device as required, and the high-pressure fluid enters the second stage and then the third stage and the fourth stage from the first stage in sequence, so as to achieve the effect of reducing pressure.

[0029] Embodiment 3: It differs from Embodiment 1 to Embodiment 2 in that: Figure 1 , 2 As shown, the diameter of the hydrophobic hole 19 is 5 mm to 6 mm.

[0030] The hydrophobic hole 19 makes the aperture of the liquid flow channel at the top of the two-stage throttling device 2 smaller. When the liquid passes through the contraction, the flow stream will become thinner or contract. The flow rate of the water in the pipeline increases as the pressure at the contraction section decreases. Due to the large internal turbulence and energy consumption, the pressure of the liquid fluid after leaving the two-stage throttling device 2 will not be completely restored to the pressure before entering the two-stage throttling device 2.

[0031] Embodiment 4: It differs from Embodiments 1 to 3 in that: Figure 1As shown, the two-stage throttling device 2, the throttle valve 11 and the stop valve 12 are all made of Q235B material of the high temperature resistant system.

[0032] As required, the throttle valve 11 is arranged between the two-stage throttling device 2 and the stop valve 12 to limit the return-to-zero water volume.

[0033] Embodiment 5: It differs from Embodiments 1 to 4 in that: Figure 1 As shown, a controller is also included. A temperature detector 16 and a liquid level detector 18 are provided on the deaerator 4. The soft water pump 7, the deaerator water pump 9, the throttle valve 11, the temperature detector 16 and the liquid level detector 18 are all electrically connected to the controller.

[0034] Embodiment 6: It differs from Embodiments 1 to 5 in that: Figure 1 As shown, a boiler water inlet flowmeter 17 is fixedly installed on the deoxygenated water pipeline 8 between the boiler drum 5 and the boiler feed water bypass pipeline 10, and the boiler water inlet flowmeter 17 is electrically connected to the controller.

[0035] According to the needs, the pipelines and equipment of the boiler drum water supply device can also be provided with conventional valves, thermometers and pressure gauges known in the art according to the production needs. The controller is a DCS controller, and its model can be the CS3000 controller produced by Yokogawa Corporation of Japan.

[0036] The above technical features constitute the embodiments of the present utility model, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A boiler drum water supply device, Features It includes a boiler body, a two-stage throttling device, a soft water tank and a deaerator. A boiler drum is arranged on the boiler body. A soft water pipeline is fixedly connected between the liquid outlet of the soft water tank and the first liquid inlet on the upper part of the deaerator. A soft water pump is fixedly installed on the soft water pipeline. A deoxygenated water pipeline is fixedly connected between the liquid outlet at the bottom of the deaerator and the liquid inlet of the boiler drum. A deoxygenated water pump is fixedly installed on the deoxygenated soft water pipeline. A boiler feed water bypass pipeline is fixedly connected between the deoxygenated water pipeline between the deoxygenated water pump and the boiler drum and the second liquid inlet on the upper part of the deaerator. A two-stage throttling device, a throttling valve and a stop valve are fixedly installed on the boiler feed water bypass pipeline in sequence along the medium flow direction.

2. The boiler drum water supply device according to claim 1, Features The double-stage throttling device comprises a primary casing and a secondary casing. The primary casing and the secondary casing are both provided with orifice tubes. The top and bottom ends of the primary casing and the secondary casing are both provided with drainage holes.

3. The boiler drum water supply device according to claim 2, Features The diameter of the hydrophobic pores is 5mm to 6mm.

4. The boiler drum water supply device according to claim 1, 2 or 3, Features The two-stage throttling device, throttling valve and stop valve are all made of high temperature resistant Q235B material.

5. The boiler drum water supply device according to claim 1, 2 or 3, Features It also includes a controller. The deaerator is provided with a temperature detector and a liquid level detector. The soft water pump, the deaerator water pump, the throttle valve, the temperature detector and the liquid level detector are all electrically connected to the controller.

6. The boiler drum water supply device according to claim 4, Features It also includes a controller. The deaerator is provided with a temperature detector and a liquid level detector. The soft water pump, the deaerator water pump, the throttle valve, the temperature detector and the liquid level detector are all electrically connected to the controller.

7. The boiler drum water supply device according to claim 6, Features A boiler water inlet flow meter is fixedly installed on the deoxygenated water pipeline between the boiler drum and the boiler feed water bypass pipeline, and the boiler water inlet flow meter is electrically connected to the controller.

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