Steam generator and steam generation system

Abstract

The utility model relates to the technical field of steam preparation, in particular to a steam generator and a steam generation system. The steam generator comprises a shell, a second heat exchange tube and a preheating unit; the shell is provided with a refrigerant inlet, a refrigerant outlet and a steam outlet; the second heat exchange pipe is connected between the refrigerant inlet and the refrigerant outlet, and the interior of the second heat exchange pipe is used for introducing a high-temperature refrigerant to exchange heat with water stored in the shell; the preheating unit is arranged at the top in the shell and comprises a first heat exchange pipe and a water supplementing pipe fitting which are connected in a heat exchange mode, the first heat exchange pipe is connected between the refrigerant inlet and the refrigerant outlet and used for introducing a high-temperature refrigerant and supplementing water in the water supplementing pipe fitting to conduct heat exchange, and a water inlet of the water supplementing pipe fitting extends out of the shell. A water outlet of the water supplementing pipe fitting is located in the shell and can supplement water in the shell. According to the steam generator, the heat exchange efficiency is remarkably improved, and then the steam preparation efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of steam preparation, and in particular to a steam generator and a steam generating system. Background Art

[0002] At present, the demand for high-temperature steam is increasing in the industrial field. In the previous system design, steam boilers were often used to prepare steam, but with the gradual ban on small boilers, many places are forced to use electric boilers as a substitute. As we all know, electric boilers have low energy utilization, so it is particularly important to develop an efficient and stable steam generation system, and high-temperature heat pump technology has broad application prospects.

[0003] As one of the core components of the high-temperature heat pump system, the performance of the steam generator determines the quality of the unit to a certain extent. In the high-temperature heat pump system, the steam generator often uses a full-liquid evaporator, which heats the shell water through the high-temperature refrigerant in the heat exchange tube to directly generate high-temperature steam and discharge it from the air outlet on the top of the shell. At the same time, low-temperature make-up water enters the shell from the bottom inlet of the shell to replenish the continuously evaporated high-temperature water. However, due to the limitations of the existing heat exchanger structure, the make-up water and the high-temperature refrigerant cannot fully exchange heat, the heat exchange efficiency is not high, and there is a large temperature difference between the make-up water entering the shell and the high-temperature water in the shell, which generates large thermal stress and affects the safe operation of the steam generator.

[0004] Therefore, how to improve the heat exchange efficiency of the steam generator becomes a technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0005] The present application provides a steam generator and a steam generating system, wherein the steam generator can significantly improve heat exchange efficiency and steam preparation efficiency.

[0006] In a first aspect, the present application provides a steam generator, comprising:

[0007] The shell is provided with a refrigerant inlet, a refrigerant outlet and a steam outlet;

[0008] A preheating unit, the preheating unit comprising a first heat exchange tube and a water supply pipe connected in heat exchange, the first heat exchange tube is connected between the refrigerant inlet and the refrigerant outlet, the water inlet of the water supply pipe extends to the outside of the shell, and the water outlet of the water supply pipe is located in the shell and supplies water into the shell;

[0009] The second heat exchange tube is connected between the refrigerant inlet and the refrigerant outlet. The interior of the second heat exchange tube is used for passing high-temperature refrigerant and exchanging heat with the water stored in the shell.

[0010] In some embodiments, the preheating unit is disposed in the shell and located inside the steam outlet.

[0011] In some embodiments, the water replenishment pipe includes an intermediate chamber and heat exchange chambers symmetrically arranged on both sides of the intermediate chamber, the heat exchange chamber and the intermediate chamber are connected, the water inlet is connected to the intermediate chamber, and the water outlet is connected to the heat exchange chamber.

[0012] In some embodiments, the water inlet is arranged at the first end of the preheating unit, and the water outlet is arranged at the second end of the preheating unit; and a water hole is arranged on the partition between the intermediate chamber and the heat exchange chamber.

[0013] In some embodiments, the water hole is arranged close to one end of the water inlet.

[0014] In some embodiments, a head is provided at both ends of the shell, and the refrigerant inlet and the refrigerant outlet are respectively arranged at the heads at both ends of the shell; a tube sheet is provided between the head and the shell, and the second heat exchange tube and the first heat exchange tube are both fixed by the tube sheet.

[0015] In some embodiments, the first heat exchange tube is provided with a first flow regulating valve for regulating the flow of refrigerant entering the first heat exchange tube, and / or the water outlet is provided with a first temperature sensor for detecting the replenishing water temperature.

[0016] In some embodiments, the second heat exchange tube is provided with a second flow regulating valve for regulating the flow of refrigerant entering the second heat exchange tube, and / or a liquid level sensor is provided in the shell.

[0017] In some embodiments, the inner wall of the water supply pipe is provided with a heat insulation layer.

[0018] In some embodiments, a sewage outlet is provided at the bottom of the shell.

[0019] In a second aspect, the present application provides a steam generation system, using the steam generator provided by any one of the above items.

[0020] In some embodiments, it also includes a compressor, an evaporator and a throttling element, and the compressor, the steam generator, the throttling element and the evaporator are connected in series in sequence to form a refrigerant circulation loop.

[0021] The above-mentioned technical scheme provided by the embodiment of the present application has the following advantages compared with the prior art: the refrigerant inlet of the shell is used to introduce high-temperature refrigerant, and the high-temperature refrigerant flows to the second heat exchange tube and the first heat exchange tube respectively, and finally flows out from the refrigerant outlet; by setting a preheating unit, high-temperature refrigerant is introduced into the first heat exchange tube and the make-up water in the make-up water pipe for heat exchange, and only a small amount of high-temperature refrigerant is needed to perform heat exchange with the make-up water with a large temperature difference, so that the make-up water is heated to a higher temperature, thereby significantly improving the heat exchange efficiency.

[0022] The heated make-up water is sent into the shell through the water outlet, reducing the temperature difference between the make-up water and the water stored in the shell, significantly reducing the thermal stress in the shell, and improving the safety of the steam generator operation; the high-temperature refrigerant entering the second heat exchange tube exchanges heat with the water stored in the shell, evaporating the water to generate a large amount of steam and outputting it from the steam outlet at the top of the shell. Due to the high make-up water temperature, the water stored in the shell can evaporate quickly when heated by the second heat exchange tube to generate a large amount of steam.

[0023] The above-mentioned steam generator uses a small amount of high-temperature refrigerant and make-up water to perform large temperature difference heat exchange through the preheating unit, which significantly improves the heat exchange efficiency, reduces the temperature difference between the make-up water and the water stored in the shell, and thus reduces the thermal stress of the shell side; by using the high-temperature refrigerant in the second heat exchange tube to heat the water stored in the shell, it is possible to quickly prepare a large amount of steam, thereby improving the steam preparation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0026] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0027] Figure 1 A schematic diagram of a steam generator provided in an embodiment of the present application;

[0028] Figure 2 for Figure 1 Cross-sectional view in ;

[0029] Figure 3 for Figure 1 Structural diagram of the middle preheating unit;

[0030] Figure 4 for Figure 1 A cross-sectional view of the middle preheating unit at the water inlet;

[0031] Figure 5 A simplified diagram of a steam generation system provided in an embodiment of the present application.

[0032] Description of reference numerals:

[0033] 10-steam generator; 11-head; 111-refrigerant inlet; 112-refrigerant outlet;

[0034] 12-tube sheet; 13-shell; 14-second heat exchange tube; 15-steam outlet;

[0035] 16-preheating unit; 161-water inlet; 162-intermediate chamber; 163-heat exchange chamber; 164-partition; 165-water outlet; 166-first heat exchange tube;

[0036] 20-throttling element;

[0037] 30-evaporator;

[0038] 40-Compressor. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0040] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0041] For ease of description, spatial relative terms may be used herein to describe the relative positional relationship or movement of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip or a posture change or a motion state change, then these directional indications also change accordingly, for example: an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative descriptors used herein are interpreted accordingly.

[0042] In order to solve the technical problem of low heat exchange efficiency of the steam generator 10 in the prior art, the present application provides a steam generator 10 that can improve heat exchange efficiency and steam preparation efficiency, reduce thermal stress in the shell side, i.e., the shell 13, and ensure safe operation of the steam generator 10.

[0043] The present application embodiment provides a steam generator 10, such as Figures 1 to 3 As shown, the steam generator 10 includes a shell 13, a second heat exchange tube 14 and a preheating unit 16. The shell 13 is used to store water. When the stored water is heated, a large amount of steam is generated. The top of the shell 13 is also provided with a steam outlet 15. The generated steam is output from the steam outlet 15 at the top of the shell 13, and then transported to a suitable place by a steam pipeline. The shell 13 is provided with a refrigerant inlet 111 and a refrigerant outlet 112. The shell 13 is connected to the external heat pump system through the refrigerant inlet 111 and the refrigerant outlet 112. The shell 13 acts as a condenser of the heat pump system. The refrigerant inlet 111 is used to introduce high-temperature refrigerant, and the refrigerant outlet 112 is used to return the refrigerant after heat exchange and cooling to the heat pump system, so as to re-prepare high-temperature refrigerant through the heat pump system.

[0044] The second heat exchange tube 14 is a heat exchange tube row, and the second heat exchange tube 14 is arranged in an array in the shell 13. The two ends of the second heat exchange tube 14 are respectively connected between the refrigerant inlet 111 and the refrigerant outlet 112. The high-temperature refrigerant entering from the refrigerant inlet 111 enters the second heat exchange tube 14 from the first end of the second heat exchange tube 14, and exchanges heat with the water stored outside the tube in the shell 13 through the second heat exchange tube 14, so that the high-temperature water is further heated to the boiling point and evaporates quickly. The refrigerant after heat exchange and cooling flows out from the second end of the second heat exchange tube 14 and the refrigerant outlet 112.

[0045] As the water stored in the shell 13 evaporates in large quantities, the liquid level of the shell 13 will also drop. It is necessary to replenish water into the shell 13 to maintain a normal liquid level to ensure the continuous preparation process of steam. The preheating unit 16 is used to replenish water into the shell 13 and heat the replenished water. The preheating unit 16 mainly includes a first heat exchange tube 166 and a water replenishment pipe fitting, and the first heat exchange tube 166 and the water replenishment pipe fitting are connected by heat exchange; illustratively, the first heat exchange tube 166 can be passed through the interior of the water replenishment pipe fitting, and the first end of the first heat exchange tube 166 is connected to the refrigerant inlet 111, and the second end of the first heat exchange tube 166 is connected to the refrigerant outlet 112.

[0046] The water supply pipe is provided with a water inlet 161 and a water outlet 165. The water inlet 161 of the water supply pipe extends to the outside of the shell 13 for introducing cold water into the water supply pipe. The water outlet 165 of the water supply pipe is located in the shell 13 for replenishing water into the shell 13.

[0047] The high-temperature refrigerant flows into the first heat exchange tube 166 from the refrigerant inlet 111 and the first end of the first heat exchange tube 166, and flows out from the second end of the first heat exchange tube 166 and the refrigerant outlet 112 after convective heat exchange between the first heat exchange tube 166 and the replenishing water in the replenishing water pipe fitting. Since there is a large temperature difference between the replenishing water in the replenishing water pipe fitting and the high-temperature refrigerant, a small amount of high-temperature refrigerant can be used to quickly heat the replenishing water to a higher temperature, and the large temperature difference heat exchange between the replenishing water and the high-temperature refrigerant significantly improves the heat exchange efficiency. The replenishing water temperature sent in after heat exchange is relatively high, and the temperature difference with the water storage in the shell 13 is relatively small. On the one hand, it can significantly reduce the thermal stress of the shell 13, that is, the shell side; on the other hand, it can ensure that the water storage in the shell 13 maintains a relatively high water temperature, which is convenient for the high-temperature refrigerant in the second heat exchange tube 14 to heat the stored water, heat the stored water to the boiling point, thereby generating a large amount of steam, and improving the steam preparation efficiency.

[0048] Generally speaking, the water temperature of the make-up water is about 30°C, and the temperature of the high-temperature refrigerant can reach 128°C. The temperature difference between the high-temperature refrigerant and the make-up water can reach 98°C. By utilizing the large temperature difference of up to 98°C, a large amount of heat exchange can be quickly completed, thereby heating the make-up water (30°C) to high-temperature water (120°C), and finally the high-temperature water is discharged from the water outlet 165 into the shell 13, completing the shell 13, i.e., the shell-side water replenishment process. The high-temperature refrigerant in the second heat exchange tube 14 further heats the high-temperature stored water, causing the high-temperature stored water to evaporate rapidly to achieve rapid and large-scale steam preparation.

[0049] The working principle of the present application is as follows: the refrigerant inlet 111 of the shell 13 is used to introduce high-temperature refrigerant, and the high-temperature refrigerant flows to the second heat exchange tube 14 and the first heat exchange tube 166 respectively, and finally flows out from the refrigerant outlet 112; by setting up a preheating unit 16, the high-temperature refrigerant is introduced into the first heat exchange tube 166 and the make-up water in the make-up water pipe is used for heat exchange, and only a small amount of high-temperature refrigerant is needed to exchange heat with the large temperature difference of the make-up water, so that the make-up water can be heated to a higher temperature, which significantly improves the heat exchange efficiency.

[0050] The heated make-up water is sent into the shell 13 through the water outlet 165, reducing the temperature difference between the make-up water and the water stored in the shell 13, significantly reducing the thermal stress in the shell side, that is, the shell 13, and improving the safety of the operation of the steam generator 10; the high-temperature refrigerant entering the second heat exchange tube 14 exchanges heat with the water stored in the shell 13, evaporating the water to generate a large amount of steam and outputting it from the steam outlet 15 at the top of the shell 13. Due to the high temperature of the make-up water, the water stored in the shell 13 can evaporate quickly to generate a large amount of steam when heated by the second heat exchange tube 14.

[0051] The steam generator 10 uses a small amount of high-temperature refrigerant and make-up water to perform large temperature difference heat exchange through the preheating unit 16, which significantly improves the heat exchange efficiency, reduces the temperature difference between the make-up water and the water stored in the shell 13, and thus reduces the thermal stress of the shell side; by heating the water stored in the shell 13 with the help of the high-temperature refrigerant in the second heat exchange tube 14, it is possible to quickly prepare a large amount of steam, thereby improving the steam preparation efficiency.

[0052] In the preferred embodiment provided in the present application, the above-mentioned preheating unit 16 is connected and fixed to the top of the shell 13 and is located below the steam outlet 15. The preheating unit 16, that is, the water supply pipe and the first heat exchange pipe 166 are arranged below the steam outlet 15, which can properly block the steam generated by evaporation, effectively avoid the phenomenon of liquid inhalation during steam evaporation, and improve the steam quality.

[0053] like Figure 1 and Figure 2 As shown, the steam generator 10 provided in the embodiment of the present application can adopt a horizontal shell 13, and the two ends of the shell 13 in the length direction are connected with the head 11, and the refrigerant inlet 111 and the refrigerant outlet 112 are respectively arranged on the head 11 at the two ends of the shell 13. In order to facilitate the fixing of the second heat exchange tube 14 and the first heat exchange tube 166, a tube sheet 12 is also provided between the two ends of the shell 13 and the head 11. The tube sheet 12 is a plate with multiple tube holes. The second heat exchange tube 14 and the first heat exchange tube 166 are fixed through the tube holes at the corresponding positions and the tube holes are sealed. The inner periphery of the tube sheet 12 and the shell 13 encloses an inner cavity for water storage, and the inner periphery of the tube sheet 12 and the head 11 encloses a refrigerant cavity for refrigerant input / output and diversion / convergence.

[0054] In specific implementation, baffles may be vertically connected in the head 11 and at the tube sheet 12 to divide the refrigerant cavity into several parts. For example, a group of baffles may be provided at the head 11 and the tube sheet 12 to divide the refrigerant cavity into two sub-cavities, one group of sub-cavities being connected to the first heat exchange tube 166, and the other group of sub-cavities being used to communicate with the second heat exchange tube 14. By providing the sub-cavities of the refrigerant cavity, it is convenient to adjust the refrigerant flow to the first heat exchange tube 166 and the second heat exchange tube 14 respectively.

[0055] like Figures 2 to 4 As shown, in this embodiment, the water supply pipe adopts a three-chamber structure in the shape of a long strip, and the water supply pipe includes an intermediate chamber 162 and heat exchange chambers 163 symmetrically arranged on both sides of the intermediate chamber 162, and the intermediate chamber 162 and the heat exchange chamber 163 are connected. The intermediate chamber 162 and the heat exchange chamber 163 extend in parallel and in the same extension direction as the first heat exchange tube 166, and the first heat exchange tube 166 is arranged in the heat exchange chambers 163 on both sides. The water inlet 161 is connected to the intermediate chamber 162, and the water outlet 165 is connected to the heat exchange chamber 163. Low-temperature water supply is sent into the intermediate chamber 162 from the water inlet 161, and then enters the heat exchange chambers 163 on both sides from the intermediate chamber 162, and quickly exchanges heat with the high-temperature refrigerant in the first heat exchange tube 166 to become high-temperature water, and then enters the shell 13 from the water outlet 165.

[0056] The water inlet 161 is arranged in the middle chamber 162, i.e., the first end of the preheating unit 16, and the water outlet 165 is arranged in the heat exchange chamber 163, i.e., the second end of the preheating unit 16. The water inlet 161 and the water outlet 165 are arranged at both ends of the preheating unit 16 to ensure that the replenishing water in the heat exchange chamber 163 of the replenishing water pipe can fully exchange heat with the high-temperature refrigerant of the first heat exchange tube 166.

[0057] The setting of the intermediate chamber 162 can play a good role in buffering the replenishment water, slowing down the movement of the replenishment water, so that the replenishment water forms a certain depth in the intermediate chamber 162 and is then transported to the heat exchange chamber 163 for heat exchange with the high-temperature refrigerant in the first heat exchange tube 166, thereby preventing the replenishment water from directly entering the heat exchange chamber 163 and scattering everywhere, causing splashing, thereby improving the heat exchange efficiency between the replenishment water in the replenishment water pipe and the high-temperature refrigerant in the first heat exchange tube 166.

[0058] The middle chamber 162 and the heat exchange chambers 163 on both sides are separated by a partition 164. The partitions 164 on both sides of the middle chamber 162 are provided with water holes, and the water holes are used to pass the replenishing water of the middle chamber 162 into the heat exchange chambers 163 on both sides. The water holes are at a certain height from the bottom of the partition 164 or the bottom of the replenishing water pipe, so that after the replenishing water of a certain depth is gathered in the middle chamber 162, it is transported to the heat exchange chambers 163 on both sides, ensuring a stable liquid level in the heat exchange chamber 163.

[0059] In particular, the water holes on both sides of the intermediate chamber 162 are arranged at the end of the partition 164 close to the water inlet 161 and away from the water outlet 165, so as to ensure that when the make-up water enters the intermediate chamber 162 and flows from the intermediate chamber 162 to the heat exchange chamber 163, the make-up water entering the heat exchange chamber 163 through the water holes is prevented from escaping directly from the water outlet 165, so that the make-up water can fully exchange heat with the first heat exchange tube 166 in the heat exchange chamber 163.

[0060] In some embodiments, in order to adjust the outlet water temperature of the make-up water and improve the heat exchange efficiency between the make-up water and the high-temperature refrigerant in the first heat exchange tube 166, a first flow regulating valve is further provided at the first end of the first heat exchange tube 166, and the flow rate of the high-temperature refrigerant entering the first heat exchange tube 166 is adjusted by the first flow regulating valve to control the heat exchange amount between the make-up water and the high-temperature refrigerant, thereby controlling the temperature of the make-up water entering the shell 13.

[0061] In addition, a first temperature sensor may be provided at the water supply pipe, i.e., the water outlet 165 of the heat exchange chamber 163, and the water supply temperature at the water outlet 165 may be detected by means of the first temperature sensor, and the flow of the high-temperature refrigerant may be adjusted in cooperation with the first flow regulating valve, thereby adjusting the water supply temperature at the water outlet 165. A second temperature sensor may also be provided at the water inlet 161 of the water supply pipe as required, and the water supply temperature at the water inlet 161 and the water supply temperature at the water outlet 165 may be detected, so as to adjust the opening of the first flow regulating valve according to the change of the water supply temperature at the water inlet 161, control the flow of the high-temperature refrigerant sent to the first heat exchange pipe 166, and thereby control the temperature of the water supply sent to the shell 13.

[0062] Exemplarily, when the water supply temperature at the water inlet 161 decreases, the opening of the first flow regulating valve is appropriately adjusted to increase; when the water supply temperature at the water inlet 161 increases, the opening of the first flow regulating valve is appropriately adjusted to decrease. When the water supply temperature at the water outlet 165 is lower than the set value, the opening of the first flow regulating valve is appropriately adjusted to increase; when the water supply temperature at the water outlet 165 is higher than the set value, the opening of the first flow regulating valve is appropriately adjusted to decrease. In this embodiment, the set value of the water supply temperature at the water outlet 165 can be 120°C. In specific implementation, the set temperature can be adjusted as needed.

[0063] A third flow regulating valve may also be provided at the water inlet 161 or the water outlet 165, and the third flow regulating valve is used to regulate the flow of the replenishing water sent to the replenishing water pipe. When the replenishing water temperature at the water outlet 165 is lower than the set value, not only can the opening of the first flow regulating valve be appropriately increased to increase the flow of the refrigerant sent to the first heat exchange pipe 166, but the opening of the third flow regulating valve may also be adjusted to decrease to reduce the flow of the replenishing water sent to the replenishing water pipe.

[0064] When the make-up water temperature at the water outlet 165 is higher than the set value, not only can the opening of the first flow regulating valve be appropriately adjusted to reduce the refrigerant flow rate sent to the first heat exchange tube 166, but the opening of the third flow regulating valve can also be adjusted to increase the make-up water flow rate sent to the make-up water pipe.

[0065] In some embodiments, the second heat exchange tube 14 is provided with a second flow regulating valve, which is used to adjust the refrigerant flow entering the second heat exchange tube 14, and then adjust the heat exchange between the second heat exchange tube 14 and the water stored in the shell 13, so as to achieve the regulation of the water storage level and steam generation in the shell 13.

[0066] A liquid level sensor may also be provided in the shell 13, and the liquid level sensor is used to detect the liquid level of the water stored in the shell 13. When the water level in the shell 13 is higher than the set liquid level, the opening of the third flow regulating valve may be adjusted to decrease, or the opening of the second flow regulating valve may be adjusted to increase at the same time, so as to increase the refrigerant flow rate input into the second heat exchange tube 14 and improve the steam generation. When the water level in the shell 13 is lower than the set liquid level, the opening of the third flow regulating valve may be adjusted to increase, so as to increase the water replenishment amount in the shell 13, or the opening of the second flow regulating valve may be adjusted to decrease at the same time, so as to reduce the refrigerant flow rate input into the second heat exchange tube 14 and reduce the steam generation.

[0067] In some embodiments, in order to reduce the water supply and steam heat exchange in the water supply pipe and affect the steam quality, an insulation layer is especially provided in the water supply pipe. The insulation layer can usually be provided on the inner wall of the water supply pipe, that is, the insulation layer can be provided on the inner wall of the heat exchange chamber 163 and the intermediate chamber 162.

[0068] It is understandable that the insulation layer set on the outer wall of the water supply pipe can achieve the same insulation effect, while the insulation layer set on the inner wall of the water supply pipe can reduce the erosion of high-temperature steam, maintain good insulation effect, and extend the service life of the insulation layer.

[0069] Taking into account that the temperature of the replenishing water in the heat exchange chamber 163 is lower on the side close to the water inlet 161 and higher on the side close to the water outlet 165, the replenishing water temperature of the intermediate chamber 162 is lower. The thickness of the insulation layer in the heat exchange chamber 163 can be gradually reduced from close to the water inlet 161 to close to the water outlet 165, and the insulation layer of the intermediate chamber 162 can be set to a constant thickness.

[0070] In addition, the heat insulation layer may be provided only on the water supply pipe, that is, the bottom inner wall of the heat exchange chamber 163 and the intermediate chamber 162 , so as to reduce the use of heat insulation materials and reduce the cost of the preheating unit 16 .

[0071] As the steam generator 10 operates and the steam preparation process continues, impurities such as salt carried in the replenishment water and the stored water will gradually concentrate and accumulate at the bottom of the shell 13. In order to facilitate the discharge of impurities in the stored water in the shell 13 out of the shell 13, a sewage outlet is usually provided at the bottom of the shell 13 so that the sewage outlet can be opened regularly for sewage discharge.

[0072] See also Figure 1 and 5 The embodiment of the present application also provides a steam generation system, using the steam generator 10 provided in the above embodiment. In particular, the steam generation system adopts a heat pump system, which mainly includes a compressor 40, an evaporator 30 and a throttling element 20. The compressor 40, the steam generator 10, the throttling element 20 and the evaporator 30 are connected in series in sequence to form a refrigerant circuit, and the steam generator 10 is equivalent to the condenser of the heat pump system.

[0073] The operating principle of the above steam generation system is as follows:

[0074] The high-temperature and high-pressure refrigerant discharged from the air outlet of the compressor 40 enters the head 11 at the first end of the shell 13 through the refrigerant inlet 111, and the high-temperature and high-pressure refrigerant is divided in the refrigerant cavity and enters different second heat exchange tubes 14 and the first heat exchange tube 166 respectively; a small amount of high-temperature and high-pressure refrigerant entering the first heat exchange tube 166 and the make-up water in the make-up water pipe are subjected to large temperature difference heat exchange, and the make-up water is heated to a higher temperature and sent into the shell 13. The refrigerant after condensation and cooling is sent into the head 11 at the second end of the shell 13, and flows out from the refrigerant outlet 112 after converging in the corresponding refrigerant cavity; the high-temperature and high-pressure refrigerant entering the second heat exchange tube 14 exchanges heat with the stored water in the shell 13, so that the stored water evaporates to produce a large amount of steam, and the refrigerant after condensation and cooling is sent into the head 11 at the second end of the shell 13, and flows out from the refrigerant outlet 112 after converging in the corresponding refrigerant cavity.

[0075] The refrigerant flowing out of the refrigerant outlet 112 is throttled by the throttling element 20 and then sent to the evaporator 30 for evaporation and absorbs heat from the external environment. The refrigerant flowing out of the evaporator 30 is sent to the compressor 40 for compression and becomes a high-temperature and high-pressure refrigerant for the next round of circulation.

[0076] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0077] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0078] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A steam generator, characterized in that: include: The shell is provided with a refrigerant inlet, a refrigerant outlet and a steam outlet; A preheating unit, the preheating unit comprising a first heat exchange tube and a water supply pipe connected in heat exchange, the first heat exchange tube is connected between the refrigerant inlet and the refrigerant outlet, the water inlet of the water supply pipe extends to the outside of the shell, and the water outlet of the water supply pipe is located in the shell and supplies water into the shell; The second heat exchange tube is connected between the refrigerant inlet and the refrigerant outlet. The interior of the second heat exchange tube is used for passing high-temperature refrigerant and exchanging heat with the water stored in the shell.

2. The steam generator according to claim 1, characterized in that: The preheating unit is arranged in the shell and located at the inner side of the steam outlet.

3. The steam generator according to claim 1, characterized in that: The water replenishment pipe includes an intermediate chamber and heat exchange chambers symmetrically arranged on both sides of the intermediate chamber, the first heat exchange tube is passed through the heat exchange chamber, the heat exchange chamber and the intermediate chamber are connected, the water inlet is connected to the intermediate chamber, and the water outlet is connected to the heat exchange chamber.

4. The steam generator according to claim 3, characterized in that: The water inlet is arranged at the first end of the preheating unit, and the water outlet is arranged at the second end of the preheating unit; and a water hole is arranged on the partition between the intermediate chamber and the heat exchange chamber.

5. The steam generator according to claim 4, characterized in that: The water hole is arranged close to one end of the water inlet.

6. The steam generator according to any one of claims 1 to 5, characterized in that: The shell is provided with a head at both ends, and the refrigerant inlet and the refrigerant outlet are respectively arranged at the heads at both ends of the shell; a tube sheet is provided between the head and the shell, and the second heat exchange tube and the first heat exchange tube are both fixed by the tube sheet.

7. The steam generator according to claim 1, characterized in that: The first heat exchange tube is provided with a first flow regulating valve for regulating the flow of refrigerant entering the first heat exchange tube, and / or the water outlet is provided with a first temperature sensor for detecting the replenishing water temperature.

8. The steam generator according to claim 1, characterized in that: The second heat exchange tube is provided with a second flow regulating valve for regulating the flow of refrigerant entering the second heat exchange tube, and / or a liquid level sensor is provided in the shell.

9. The steam generator according to claim 1, characterized in that: The inner wall of the water replenishment pipe is provided with a heat insulation layer.

10. A steam generating system, characterized in that: A steam generator according to any one of claims 1 to 9 is used.

11. The steam generating system according to claim 10, characterized in that: It also includes a compressor, an evaporator and a throttling element. The compressor, the steam generator, the throttling element and the evaporator are connected in series in sequence to form a refrigerant circulation loop.

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