Steam generating device

Abstract

The utility model discloses a steam generating device, including electric boiler, evaporimeter, preheater and feed water tank, be provided with the out heat medium mouth and the back heat medium mouth on the electric boiler, be provided with oil import, oil export, hot water import and steam export on the evaporimeter, be provided with the water inlet, the water outlet, the oil connection and the oil drain on the preheater, the out heat medium mouth with oil import meets, oil export with oil connection meets, the oil drain with back heat medium mouth meets, the water outlet directly or indirectly with hot water import meets, the water inlet with feed water tank meets. This kind of steam generating device has following beneficial effect: store water under normal temperature and normal pressure, reduced the risk of leakage when storing water, and the safety factor is relatively higher.

Description

Technical Field

[0001] This utility model relates to the field of steam generating devices, and more particularly to a steam generating device. Background Technology

[0002] Currently, many industrial and agricultural production sites use electric boilers to generate steam. Patent publication document CN222186889U discloses a device for generating steam by heating water with molten salt. In this steam generation device, to prevent the heat exchange equipment from breaking due to excessive temperature difference during heat exchange between molten salt and water, a high-temperature water storage tank is specially set up. The water temperature stored in the high-temperature water storage tank is in the range of 150 degrees Celsius to 200 degrees Celsius, and the pressure resistance of the water tank must reach more than 1.5 MPa. Therefore, this type of steam generator must be equipped with a pressure-resistant tank with good heat insulation performance and a pressure resistance of more than 1.5 MPa. Because the pressure inside the pressure-resistant tank is relatively high, once a leak occurs, the high-temperature water inside the tank may spray out, posing a huge safety hazard. Utility Model Content

[0003] To address the aforementioned problems, this invention proposes a steam generator that stores water at normal temperature and pressure, reducing the risk of leakage during water storage and providing a relatively higher safety factor.

[0004] The technical solution adopted by this utility model is as follows:

[0005] A steam generating device includes an electric boiler, an evaporator, a preheater, and a feedwater tank. The electric boiler is provided with an outlet for heat transfer medium and a return outlet for heat transfer medium. The evaporator is provided with an oil inlet, an oil outlet, a hot water inlet, and a steam outlet. The preheater is provided with a water inlet, a water outlet, an oil inlet, and an oil outlet. The outlet for heat transfer medium is connected to the oil inlet, the oil outlet is connected to the oil inlet, the oil outlet is connected to the return outlet for heat transfer medium, the water outlet is directly or indirectly connected to the hot water inlet, and the water inlet is connected to the feedwater tank.

[0006] In this type of steam generator, the electric boiler heats the heat transfer oil before feeding it into the evaporator. After leaving the evaporator, the heat transfer oil enters the preheater and finally returns to the electric boiler. Therefore, the temperature of the heat transfer oil in the evaporator is higher than that in the preheater. Room temperature water (20°C to 25°C) from the feedwater tank enters the preheater. The water is first preheated by low-temperature heat transfer oil before entering the evaporator to generate steam. In this type of steam generator, water is stored at normal temperature and pressure, allowing for storage at relatively low temperatures. This reduces the risk of leakage during water storage, resulting in a higher safety factor. Furthermore, preheating before steam generation reduces the probability of the evaporator cracking due to sudden temperature changes.

[0007] Optionally, it also includes a steam drum, wherein the water outlet is connected to the steam drum, the hot water inlet is connected to the steam drum, the steam outlet is connected to the steam drum, and the steam drum is provided with a steam pipe.

[0008] After being preheated in the preheater, the water first enters the steam drum (which contains steam). Upon entering the steam drum, the preheated water (containing steam) undergoes water-vapor separation. The steam remains in the steam drum, while the liquid water sinks and enters the evaporator. In the evaporator, the liquid water exchanges heat with the high-temperature heat transfer oil, thus turning into steam. The steam then enters the steam drum and exits through the steam pipe. Because the steam drum has a certain heat storage capacity, it can mitigate steam pressure fluctuations during load changes, stabilize the operation of the entire steam generator, reduce the water content of the steam, and ensure the purity of the output steam.

[0009] Optionally, a muffler is attached to the steam drum.

[0010] The function of a muffler is to reduce exhaust noise.

[0011] Optionally, the evaporator is connected to a start-up gas supply pipe.

[0012] The purpose of starting the steam supply pipe is to replenish steam during the startup phase.

[0013] Optionally, it also includes a switching valve assembly, which is disposed between the water supply tank and the preheater.

[0014] The function of the on / off valve assembly is to control the flow of water between the water tank and the preheater.

[0015] Optionally, the preheater includes a first inner tube bundle, a second inner tube bundle, a first straight tube, a second straight tube, and an arc-shaped connecting tube. The two ends of the arc-shaped connecting tube are connected to the first straight tube and the second straight tube, respectively. The first straight tube and the second straight tube are parallel and do not contact each other. The first straight tube, the arc-shaped connecting tube, and the second straight tube are integrally formed. The first straight tube and the second straight tube have the same shape and size. The first inner tube bundle and the second inner tube bundle are both U-shaped. The first inner tube bundle is disposed inside the first straight tube, and the second inner tube bundle is disposed inside the second straight tube. Neither the first inner tube bundle nor the second inner tube bundle contacts the arc-shaped connecting tube.

[0016] Optionally, it also includes end seals. One end of the first straight pipe is provided with a tube sheet flange, and one end of the second straight pipe is provided with a tube sheet flange. The tube sheet flanges on the first and second straight pipes are both connected to the end seals. The first inner tube bundle and the second inner tube bundle are each connected to an end seal. There are two end seals. Each end seal is provided with a travel baffle. The first inner tube bundle is connected to the outlet and the first auxiliary inner tube respectively. The outlet and the first auxiliary inner tube are set on the same end seal. The second inner tube bundle is connected to the second main inner tube and the inlet respectively. The second main inner tube and the inlet are set on the same end seal.

[0017] Optionally, both the first inner tube bundle and the second inner tube bundle are provided with baffles, which are close to the inner wall of the first straight tube or the second straight tube.

[0018] The beneficial effects of this invention are: storing water at normal temperature and pressure reduces the risk of leakage during water storage, resulting in a relatively higher safety factor. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0020] Figure 1 This is a simplified schematic diagram of a steam generator.

[0021] Figure 2 This is a simplified structural diagram of the preheater;

[0022] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0023] Figure 4 yes Figure 2 Enlarged diagram of point B in the middle.

[0024] The attached figures are labeled as follows: 1. Feedwater tank; 2. Switch valve assembly; 3. Preheater; 3101. First straight pipe; 3102. Second straight pipe; 3103. Arc connecting pipe; 3201. First inner tube bundle; 3202. Second inner tube bundle; 3301. Oil inlet; 3302. Oil outlet; 34. Tube sheet flange; 35. End seal seat; 36. Stroke baffle; 3701. Water outlet; 3702. First auxiliary inner pipe; 3703. Second main inner pipe; 3704. Water inlet; 38. Connecting pipe; 39. Baffle plate; 4. Evaporator; 41. Start-up air supply pipe; 5. Steam drum; 51. Steam connection pipe; 52. Silencer; 6. Electric boiler. Detailed Implementation

[0025] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0026] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] In the description of this application, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0028] As attached Figure 1As shown, a steam generating device includes an electric boiler 6, an evaporator 4, a preheater 3, and a feedwater tank 1. The electric boiler 6 is provided with an outlet for heat transfer medium and a return outlet for heat transfer medium. The evaporator 4 is provided with an oil inlet, an oil outlet, a hot water inlet, and a steam outlet. The preheater 3 is provided with a water inlet 3704, a water outlet 3701, an oil inlet 3301, and an oil outlet 3302. The outlet for heat transfer medium is connected to the oil inlet, the oil outlet is connected to the oil inlet 3301, the oil outlet 3302 is connected to the return outlet for heat transfer medium, the water outlet 3701 is directly or indirectly connected to the hot water inlet, and the water inlet 3704 is connected to the feedwater tank 1.

[0029] In this type of steam generator, the electric boiler 6 heats the heat transfer oil and then feeds it into the evaporator 4. After leaving the evaporator 4, the heat transfer oil enters the preheater 3 and finally returns to the electric boiler 6. Therefore, the temperature of the heat transfer oil in the evaporator 4 is higher than that in the preheater 3. Room temperature water (20°C to 25°C) from the feedwater tank 1 enters the preheater 3. The water is first preheated by the low-temperature heat transfer oil and then enters the evaporator 4 to generate steam. In this type of steam generator, water is stored at normal temperature and pressure, allowing for storage at relatively low temperatures. This reduces the risk of leakage during water storage, resulting in a higher safety factor. Furthermore, preheating before steam generation reduces the probability of the evaporator 4 cracking due to sudden temperature changes.

[0030] The heat transfer medium used in this device is heat transfer oil, and the function of the electric boiler is to heat the heat transfer oil.

[0031] As attached Figure 1 As shown, it also includes a steam drum 5, a water outlet 3701 connected to the steam drum 5, a hot water inlet connected to the steam drum 5, a steam outlet connected to the steam drum 5, and a steam pipe 51 installed on the steam drum 5.

[0032] After being preheated in preheater 3, the water first enters steam drum 5 (which contains steam). Upon entering steam drum 5, the preheated water (containing steam) undergoes water-vapor separation. The steam remains in steam drum 5, while the liquid water sinks into evaporator 4. In evaporator 4, the liquid water exchanges heat with high-temperature heat transfer oil, thus turning into steam. The steam then enters steam drum 5 and exits through steam connector 51. Because steam drum 5 has a certain heat storage capacity, it can mitigate steam pressure fluctuations during load changes, stabilize the operation of the entire steam generator, reduce the water content of the steam, and ensure the purity of the output steam.

[0033] As attached Figure 1 As shown, a muffler 52 is connected to the steam drum 5.

[0034] The function of muffler 52 is to reduce exhaust noise.

[0035] As attached Figure 1 As shown, the evaporator 4 is connected to a start-up gas supply pipe 41.

[0036] The function of the start-up air supply pipe 41 is to supplement steam during the start-up phase.

[0037] As attached Figure 1 As shown, it also includes a switch valve assembly 2, which is located between the water supply tank 1 and the preheater 3.

[0038] The function of the switch valve group 2 is to control the opening and closing of the water circuit between the water tank and the preheater 3.

[0039] As attached Figure 2 , 3 As shown in Figure 4, the preheating pipe includes a first inner tube bundle 3201, a second inner tube bundle 3202, a first straight tube 3101, a second straight tube 3102, and an arc-shaped connecting tube 3013. The two ends of the arc-shaped connecting tube 3013 are connected to the first straight tube 3101 and the second straight tube 3102, respectively. The first straight tube 3101 and the second straight tube 3102 are parallel and do not contact each other. The first straight tube 3101, the arc-shaped connecting tube 3013, and the second straight tube 3102 are integrally formed. The first straight tube 3101 and the second straight tube 3102 have the same shape and size. The first inner tube bundle 3201 and the second inner tube bundle 3202 are both U-shaped. The first inner tube bundle 3201 is disposed inside the first straight tube 3101, and the second inner tube bundle 3202 is disposed inside the second straight tube 3102. Neither the first inner tube bundle 3201 nor the second inner tube bundle 3202 contacts the arc-shaped connecting tube 3013.

[0040] In this type of heat exchanger, both the first inner tube bundle 3201 and the second inner tube bundle 3202 are U-shaped. The first inner tube bundle 3201 is located inside the first straight tube 3101, and the second outer tube is located inside the second straight tube 3102. The first straight tube 3101 and the second straight tube 3102 are connected by an arc-shaped connecting pipe 3013. The first straight tube 3101, the second straight tube 3102, and the arc-shaped connecting pipe 3013 are integrally formed. Therefore, the large U-shaped tube composed of the first straight tube 3101, the second straight tube 3102, and the arc-shaped connecting pipe 3013 is a single piece of tube, not welded together. Thus, this large U-shaped tube has excellent sealing and pressure-bearing performance. Furthermore, since the first inner tube bundle 3201 and the second inner tube bundle 3202 are located inside the first straight pipe 3101 and the second straight pipe 3102 respectively, although the first inner tube bundle 3201 and the second inner tube bundle 3202 are both U-shaped, it can still be ensured that the first inner tube bundle 3201 and the second inner tube bundle 3202 are almost integrated. Therefore, in this type of heat exchange device, the first inner tube bundle 3201, the second inner tube bundle 3202 and the large U-shaped tube can be ensured to have good pressure bearing performance and sealing performance. Thus, the inner tubes and outer tubes of this type of heat exchange device have good pressure bearing performance and sealing performance, and the probability of leakage and rupture during the heat exchange process is relatively low.

[0041] Meanwhile, in this heat exchanger, since both the first inner tube bundle 3201 and the second inner tube bundle 3202 are U-shaped, the flow path of the heat exchange liquid flowing through the first inner tube and the second inner tube bundle 3202 is U-shaped. This ensures that the liquid flowing through the first inner tube and the second inner tube can fully exchange heat with the liquid in the large U-shaped tube, improving heat exchange efficiency. In summary, this heat exchanger, by using an integrally formed large U-shaped tube and a U-shaped inner tube body, has good pressure-bearing and sealing performance for both the inner and outer tubes. The probability of leakage and rupture during heat exchange is relatively low, and the heat exchange efficiency is relatively high.

[0042] As attached Figure 2 , 3 As shown in Figure 4, the first straight pipe 3101 is connected to an oil inlet 3301, and the second straight pipe 3102 is connected to an oil outlet 3302.

[0043] Setting up the oil inlet 3301 and the oil outlet 3302 only requires drilling holes in the first straight pipe 3101 and the second straight pipe 3102 before installation.

[0044] Specifically, oil inlet 3301 is the channel for heat transfer oil to flow into the large U-shaped tube, while oil outlet 3302 is the channel for heat transfer oil to flow out of the U-shaped tube.

[0045] As attached Figure 2 , 3 As shown in Figure 4, the inner diameter of the oil inlet 3301 is equal to the inner diameter of the oil outlet 3302.

[0046] The fact that the inner diameter of the oil inlet 3301 is equal to the inner diameter of the oil outlet 3302 ensures that the liquid flows into the large U-shaped tube at the same speed as it flows out of the large U-shaped tube, thus ensuring that the heat transfer oil flows stably inside the large U-shaped tube.

[0047] It also includes end seals 35. One end of the first straight pipe 3101 is provided with a tube sheet flange 34, and one end of the second straight pipe 3102 is provided with a tube sheet flange 34. The tube sheet flanges 34 on the first straight pipe 3101 and the second straight pipe 3102 are both connected to end seals 35. The first inner tube bundle 3201 and the second inner tube bundle 3202 are each connected to an end seal 35.

[0048] The end seal 35 serves to install the first inner tube bundle 3201 inside the first straight tube 3101 and the second inner tube bundle 3202 inside the second straight tube 3102. The end seal 35 is bolted to the tube sheet flange 34 for sealing and fixing, and can be disassembled and assembled as needed.

[0049] As attached Figure 2 , 3 As shown in Figure 4, there are two end seal seats 35. Each end seal seat 35 is provided with a travel baffle 36. The first inner tube bundle 3201 is connected to the outlet 3701 and the first auxiliary inner tube 3702 respectively. The outlet 3701 and the first auxiliary inner tube 3702 are set on the same end seal seat 35. The second inner tube bundle 3202 is connected to the second main inner tube 3703 and the inlet 3704 respectively. The second main inner tube 3703 and the inlet 3704 are set on the same end seal seat 35.

[0050] Because the end seal 35 needs to be connected to the first inner tube bundle 3201 or the second inner tube bundle 3202, a travel partition 36 is provided in the end seal 35. The travel partition 36 divides the cavity in the end seal 35 into two inner cavities, which are respectively connected to the inlet and outlet of the inner tube bundle.

[0051] As attached Figure 2 , 3 As shown in Figure 4, the first auxiliary inner pipe 3702 and the second main inner pipe 3703 are connected by a connecting pipe 38.

[0052] After the first auxiliary inner pipe 3702 and the second main inner pipe 3703 are connected by the connecting pipe 38, the first inner pipe bundle 3201 and the second inner pipe bundle 3202 are connected. In this way, during heat exchange, water can pass through the second inner pipe bundle 3202 in sequence before entering the first inner pipe bundle 3201, and then exit from the outlet 3701 after completing the heat exchange.

[0053] As attached Figure 2 , 3As shown in Figure 4, both the first inner tube bundle 3201 and the second inner tube bundle 3202 are provided with baffles 39, which are close to the inner wall of the first straight tube 3101 or the second straight tube 3102.

[0054] The function of the baffle plate 39 is to make the liquid in the large U-shaped tube flow in a zigzag pattern, thereby improving the heat exchange efficiency, while ensuring the stability of the first inner tube bundle 3201 in the first straight tube 3101 and the stability of the second inner tube bundle 3202 in the second straight tube 3102.

[0055] As attached Figure 2 , 3 As shown in Figure 4, the baffles 39 are in a parallel and non-contact state, and the distance between two adjacent baffles 39 is equal.

[0056] Any special notes are attached. Figure 1 The solid triangular arrow points in the direction of water flow, the solid half-triangular arrow points in the direction of steam flow, and the hollow triangular arrow points in the direction of heat transfer oil flow.

[0057] The above-described embodiments only illustrate some aspects of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A steam generating device, characterized in that, The system includes an electric boiler, an evaporator, a preheater, and a feedwater tank. The electric boiler is equipped with an outlet for the heat transfer medium and a return outlet for the heat transfer medium. The evaporator is equipped with an oil inlet, an oil outlet, a hot water inlet, and a steam outlet. The preheater is equipped with a water inlet, a water outlet, an oil inlet, and an oil outlet. The outlet for the heat transfer medium is connected to the oil inlet. The oil outlet is connected to the oil inlet. The oil outlet is connected to the return outlet for the heat transfer medium. The water outlet is directly or indirectly connected to the hot water inlet. The water inlet is connected to the feedwater tank.

2. The steam generating device according to claim 1, characterized in that, It also includes a steam drum, with the water outlet connected to the steam drum, the hot water inlet connected to the steam drum, the steam outlet connected to the steam drum, and a steam pipe provided on the steam drum.

3. A steam generating device according to claim 2, characterized in that, The steam drum is equipped with a silencer.

4. A steam generating device according to claim 1, characterized in that, The evaporator is connected to a start-up gas supply pipe.

5. A steam generating device according to claim 1, characterized in that, It also includes a switch valve assembly, which is disposed between the water supply tank and the preheater.

6. A steam generating device according to claim 1, characterized in that, The preheater includes a first inner tube bundle, a second inner tube bundle, a first straight tube, a second straight tube, and an arc-shaped connecting tube. The two ends of the arc-shaped connecting tube are connected to the first straight tube and the second straight tube, respectively. The first straight tube and the second straight tube are parallel and do not contact each other. The first straight tube, the arc-shaped connecting tube, and the second straight tube are integrally formed. The first straight tube and the second straight tube have the same shape and size. The first inner tube bundle and the second inner tube bundle are both U-shaped. The first inner tube bundle is disposed inside the first straight tube, and the second inner tube bundle is disposed inside the second straight tube. Neither the first inner tube bundle nor the second inner tube bundle contacts the arc-shaped connecting tube.

7. A steam generating device according to claim 6, characterized in that, It also includes end seals. One end of the first straight pipe is provided with a tube sheet flange, and one end of the second straight pipe is provided with a tube sheet flange. The tube sheet flanges on the first and second straight pipes are connected to the end seals. The first inner tube bundle and the second inner tube bundle are each connected to an end seal. There are two end seals. Each end seal is provided with a travel baffle. The first inner tube bundle is connected to the outlet and the first auxiliary inner tube, respectively. The outlet and the first auxiliary inner tube are set on the same end seal. The second inner tube bundle is connected to the second main inner tube and the inlet, respectively. The second main inner tube and the inlet are set on the same end seal.

8. A steam generating device according to claim 6, characterized in that, Both the first inner tube bundle and the second inner tube bundle are provided with baffles, which are close to the inner wall of the first straight tube or the second straight tube.

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