A steam heating device

Abstract

The present application discloses a steam heating device. The steam heating device includes: a first heater, which includes a first cavity housing, a first steam pipe, and at least two spaced-apart first steam injection pipes. Opposite ends of each first steam injection pipe are respectively connected to the first cavity housing and the first steam pipe; a delivery pipe, one end of the delivery pipe is connected to the first cavity housing; a second heater, which includes a second cavity housing, a second steam pipe, and at least two spaced-apart second steam injection pipes. Opposite ends of each second steam injection pipe are respectively connected to the second cavity housing and the second steam pipe, and the second cavity housing is connected to the other end of the delivery pipe. By the above method, the steam heating device in the present application integrates the steam pipeline into the pipeline for delivering the water to be heated and adopts a multi-stage heating method, effectively improving the efficiency of steam heating and avoiding waste of the water to be heated.

Description

Technical Field

[0001] This application relates to the technical field of water heating, and particularly to a steam heating device. Background Art

[0002] Currently, in industrial production, especially in the pulp mixing and wire section processes in the paper-making field, the application of warm water mixing and warm water as a heat preservation medium is usually involved. Among them, the temperature requirement of warm water is generally around 50° to 60°. Therefore, how to effectively use the factory equipment to heat a large amount of clear water is an important factor affecting energy conservation and emission reduction in industrial production.

[0003] Currently, the common methods for heating clear water are mainly divided into two types: electric heating and steam heating. Since the energy consumption of steam is lower than that of electric heating when heating clear water to a temperature not higher than 70°, considering the actual production scenario of the factory, especially the factory with its own thermal power boiler, the scheme of using steam to heat warm water is more common.

[0004] However, the common steam heating schemes on the market usually mix clear water and steam pipes into a barrel tank with a pressure relief device for mixed heating, or use a heating medium to conduct the temperature of the steam to the heating medium for heating clear water. After the warm water in the barrel tank is heated to the set temperature, it is input into the required process flow. However, the traditional method of heating warm water in a barrel tank usually has relatively low efficiency in steam mixed heating and heating medium heating. It usually takes about 20 - 40 minutes to complete the heating of clear water, and the start and stop stages of the warm water heating process will also cause waste of warm water in the barrel tank. Summary of the Invention

[0005] A steam heating device provided by this application can solve the problems of low heating efficiency of steam heating in the prior art and more waste of warm water in the heating process.

[0006] To solve the above technical problems, a technical solution adopted in this application is: to provide a steam heating device, wherein the steam heating device includes: a first heater, including a first cavity housing, a first steam pipe, and at least two spaced-apart first steam injection pipes, with opposite ends of each first steam injection pipe respectively connected to the first cavity housing and the first steam pipe; a delivery pipe, with one end of the delivery pipe connected to the first cavity housing; a second heater, including a second cavity housing, a second steam pipe, and at least two spaced-apart second steam injection pipes, with opposite ends of each second steam injection pipe respectively connected to the second cavity housing and the second steam pipe, and the second cavity housing connected to the other end of the delivery pipe, so that when the water to be heated enters from one end opening of the first cavity housing and is discharged through the delivery pipe to one end opening of the second cavity housing, each first steam injection pipe injects the first steam in the first steam pipe into the first cavity formed corresponding to the first cavity housing to perform a primary heating on the water to be heated, and each second steam injection pipe injects the second steam in the second steam pipe into the second cavity formed corresponding to the second cavity housing to perform a secondary heating on the water to be heated after the primary heating.

[0007] Wherein, the number of the first steam pipes is two, the extending directions of the two first steam pipes are both parallel to the extending direction of the first cavity housing, and they are respectively and spacedly arranged on opposite sides of the first cavity housing.

[0008] Wherein, each first steam injection pipe is offset in the direction of a first angle or a second angle with respect to the direction perpendicular to the extending direction of the first cavity housing, and the offset directions of the first steam injection pipes corresponding to the first steam pipes on different sides of the first cavity housing are different.

[0009] Wherein, the steam heating device further includes a third steam pipe arranged in parallel and spaced apart from the first steam pipe and at least two spaced-apart third steam injection pipes, with opposite ends of each third steam injection pipe respectively connected to the first cavity housing and the third steam pipe.

[0010] Wherein, the number of the second steam pipes is two, the extending directions of the two second steam pipes are both parallel to the extending direction of the second cavity housing, and they are respectively and spacedly arranged on opposite sides of the second cavity housing, and each second steam injection pipe is offset in the direction of a third angle with respect to the direction perpendicular to the extending direction of the second cavity housing.

[0011] Wherein, the steam heating device further includes a fourth steam pipe arranged in parallel and spaced apart from the second steam pipe and at least two spaced-apart fourth steam injection pipes, with opposite ends of each fourth steam injection pipe respectively connected to the second cavity housing and the fourth steam pipe.

[0012] Among them, a first injection head is further provided at one end of the first steam injection pipe close to the first cavity housing. The first injection head includes a first-stage injection part and a second-stage injection part which are connected and are in a cylindrical shape. One end of the first steam injection pipe penetrates through a first through hole formed corresponding to the first cavity housing, so that the first injection head is accommodated in the first cavity. Among them, a plurality of first injection holes are provided on the first-stage injection part and are arranged at intervals. The plurality of first injection holes are arranged in at least two concentric circles on the first-stage injection part. A plurality of second injection holes are provided on the second-stage injection part and are arranged at intervals. The plurality of second injection holes are arranged in at least two concentric circles on the second-stage injection part.

[0013] Among them, the steam heating device further includes a water inlet pipe and a drain pipe. The water inlet pipe is connected to the opening at one end of the first cavity housing far from the conveying pipe, and the drain pipe is connected to the opening at one end of the second cavity housing far from the conveying pipe. A first butterfly valve and a check valve are sequentially arranged at intervals at one end of the water inlet pipe close to the first cavity housing, and a second butterfly valve is arranged at one end of the drain pipe close to the second cavity housing.

[0014] Among them, a third butterfly valve is arranged at the middle position of the conveying pipe.

[0015] Among them, the steam heating device further includes a steam conveying pipe and a control circuit. A steam pneumatic valve is provided on the steam conveying pipe and is connected to the first steam pipe and the second steam pipe. The control circuit includes a first intermediate relay and a second intermediate relay. The first intermediate relay and the second intermediate relay are coupled to the first butterfly valve and the steam pneumatic valve, so that when the first butterfly valve is opened, the first intermediate relay triggers an action to open the steam pneumatic valve, and when the first butterfly valve is closed, the second intermediate relay triggers an action to close the steam pneumatic valve.

[0016] The beneficial effects of the present application are as follows: Different from the prior art, the steam heating device provided by the present application includes: a first heater, a second heater, and a delivery pipe. The first heater includes a first cavity housing, a first steam pipe, and at least two spaced-apart first steam injection pipes. Opposite ends of each first steam injection pipe are respectively connected to the first cavity housing and the first steam pipe. The second heater includes a second cavity housing, a second steam pipe, and at least two spaced-apart second steam injection pipes. Opposite ends of each second steam injection pipe are respectively connected to the second cavity housing and the second steam pipe. When the water to be heated enters through an opening at one end of the first cavity housing and is discharged through the delivery pipe to an opening at one end of the second cavity housing, each first steam injection pipe injects the first steam in the first steam pipe into the first cavity formed corresponding to the first cavity housing to perform a primary heating on the water to be heated, and each second steam injection pipe injects the second steam in the second steam pipe into the second cavity formed corresponding to the second cavity housing to perform a secondary heating on the water to be heated after the primary heating. Thus, by integrating the steam pipeline into the delivery pipeline of the water to be heated and adopting a multi-stage heating method, the efficiency of steam heating can be effectively improved, and the waste generated when the water to be heated flows in different processes can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of an embodiment of the steam heating device of the present application;

[0018] Figure 2 is Figure 1 a detailed structural diagram of the first heater in the steam heating device in;

[0019] Figure 3 is Figure 1 a detailed structural diagram of the first heater in the steam heating device in;

[0020] Figure 4 is Figure 2 a detailed structural diagram of the first injection head in the first heater in;

[0021] Figure 5 is Figure 4 a cross-sectional view of the primary injection part in the first injection head in;

[0022] Figure 6 is Figure 4 a cross-sectional view of the secondary injection part in the first injection head in;

[0023] Figure 7 is Figure 4 a bottom view of the first injection head in;

[0024] Figure 8 is a circuit schematic diagram of an embodiment of the control circuit in the steam heating device of the present application;

[0025] Figure 9 It is the circuit schematic diagram of another embodiment of the control circuit in the steam heating device of the present application. Specific embodiments

[0026] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0027] The terms "first", "second", and "third" in the present application are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", and "third" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined. All directional indications (such as up, down, left, right, front, back...) in the embodiments of the present application are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally further include steps or units not listed, or may optionally further include other steps or units inherent to these processes, methods, products, or devices.

[0028] Referring to "embodiments" herein means that the specific features, structures, or characteristics described in conjunction with the embodiments may be included in at least one embodiment of the present application. The phrase appears in various positions in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

[0029] Next, the present application will be described in detail in conjunction with the accompanying drawings and embodiments.

[0030] Please refer to Figures 1 - 3 , wherein, Figure 1 is the structural schematic diagram of an embodiment of the steam heating device of the present application, Figure 2 is Figure 1 a detailed structural schematic diagram of the first heater in the steam heating device inFigure 3 yes Figure 1 A detailed structural diagram of the first heater in the steam heating device. In this embodiment, the steam heating device 1 includes: a first heater 10, a second heater 30 and a delivery pipe 20.

[0031] Among them, a steam heating device 1 provided in the present application is specifically a device for heating clean water, or warm water generated during the production process, so as to reach the higher temperature required for the subsequent process flow.

[0032] Specifically, the first heater 10 in the steam heating device 1 further includes a first cavity shell 11 , a first steam pipe 12 , and at least two first steam injection pipes 13 spaced apart from each other.

[0033] Among them, the first cavity shell 11 can form a corresponding first cavity, and can be specifically understood as a specially designed water supply pipeline, or a section that originally exists in a pipeline that needs to carry out water transportation in the corresponding production process, or is obtained by adaptive structural modification of this section of the pipeline, so as to avoid as much as possible the heated water that originally needs to be transported through the first cavity being transferred to a specific heating device for heating and then returned to the water supply pipeline in the production system, which will cause a large waste of water, unnecessary heat loss, and lower heating efficiency.

[0034] Furthermore, the first steam pipe 12 corresponds to a pipeline for providing steam or transporting steam, so that the heating medium for the water to be heated, i.e., high-temperature steam, can be obtained by connecting to a steam generating device, such as a steam pump, or an upper-level medium-pressure steam pipeline, through the first cavity.

[0035] Among them, the opposite ends of each first steam injection pipe 13 arranged on the first steam pipe 12 are respectively connected to the first cavity shell 11 and the first steam pipe 12, and are correspondingly connected to the first cavity formed by the first cavity shell 11 and the first steam pipe 12, so that the first steam pipe 12 can inject the first steam generated or transported correspondingly into the first cavity through each first steam injection pipe 13 to heat the water to be heated in the first cavity.

[0036] Similarly, the second heater 30 in the steam heating device 1 further includes a second cavity shell 31, a second steam pipe 32 and at least two spaced second steam injection pipes 33, and the opposite ends of each second steam injection pipe 33 are respectively connected to the second cavity shell 31 and the second steam pipe 32, and the second cavity shell 31 can also be understood as a specially designed water pipeline, or a section of a water pipeline in a corresponding production system, or a modified part thereof, so as to form a corresponding second cavity, and specifically a downstream pipeline for water transportation of the first cavity.

[0037] Furthermore, the second steam pipe 32 correspondingly serves as a pipe for supplying or transporting steam, so that the second steam generated or transported by each second steam injection pipe 33 can be injected into the second cavity to heat the water to be heated that passes through the second cavity.

[0038] Wherein, the opposite ends of the conveying pipe 20 are respectively connected to the first cavity housing 11 and the second cavity housing 31, that is, specifically arranged between the first cavity housing 11 and the second cavity housing 31 and communicated with the first cavity and the second cavity, so as to be able to convey the water to be heated in the first cavity to the second cavity.

[0039] It can be understood that when the water to be heated enters from one end opening of the first cavity housing 11 and is discharged from one end opening of the second cavity housing 31 via the conveying pipe 20. For example, when a water pump in a production system pumps clear water or warm water generated in other technological processes, that is, the water to be heated, into the first cavity from one end opening of the first cavity housing 11 and makes it pass through the conveying pipe 20 and the second cavity in sequence, each first steam injection pipe 13 can correspondingly inject the first steam in the first steam pipe 12 into the first cavity formed by the first cavity housing 11, so that the first steam at a higher temperature can be mixed with the water to be heated to heat the water to be heated for the first time; and each second steam injection pipe 33 can also correspondingly inject the second steam in the second steam pipe 32 into the second cavity formed by the second cavity housing 31, so that the second steam at a higher temperature can be mixed with the water to be heated after the first heating to heat it for the second time.

[0040] It can be seen from this that the above solution integrates the steam pipeline into the conveying pipe 20 of the water to be heated and adopts multi-stage heating, that is, multiple heating methods, which can effectively improve the efficiency of steam heating and avoid waste and heat loss generated when the water to be heated flows in different processes, thereby further reducing the heating energy consumption.

[0041] In an embodiment, the number of the first steam pipes 12 is specifically two, and the extending directions of the two first steam pipes 12 are both parallel to the extending direction of the first cavity housing 11 and are respectively arranged at intervals on the opposite sides of the first cavity housing 11. For example, the two first steam pipes 12 are arranged in parallel at intervals on the left and right sides or the upper and lower sides of the first cavity housing 11.

[0042] Furthermore, as Figure 2As shown, at least two first steam injection pipes 13 connected to the first cavity housing 11 are correspondingly provided on each first steam pipe 12, and each first steam injection pipe 13 is specifically offset in a direction forming a first angle a or a second angle b with the direction perpendicular to the extending direction of the first cavity housing 11. Moreover, the offset directions of the first steam injection pipes 13 corresponding to the first steam pipes 12 on different sides of the first cavity housing 11 are different, while the offset directions of the first steam injection pipes 13 connected to the same first steam pipe 12 are the same.

[0043] It can be understood that when the extending directions of the first steam injection pipes 13 corresponding to the first steam pipes 12 on one side of the first cavity housing 11 form a first angle a with the direction perpendicular to the extending direction of the first cavity housing 11, then the extending directions of the first steam injection pipes 13 corresponding to the first steam pipes 12 on the other side of the first cavity housing 11 form a second angle b with the direction perpendicular to the extending direction of the first cavity housing 11.

[0044] Furthermore, the second angle b can specifically be the opposite number of the first angle a, and the number of the first steam injection pipes 13 respectively and correspondingly connected to two first steam pipes 12 spaced apart on the opposite sides of the first cavity housing 11 is the same and they are in one-to-one correspondence. When each pair of relatively arranged first steam injection pipes 13 injects the first steam into the first cavity, a mixed eddy current can be correspondingly formed at the central axis position of the first cavity, which is beneficial to the heat exchange between the first steam and the water to be heated. At the same time, the first steam and the water to be heated forming the mixed eddy current can also move forward along the direction of the medium flow under the action of the pipeline pressure.

[0045] Optionally, the number of the first steam injection pipes 13 respectively connected to different first steam pipes 12 and correspondingly arranged is specifically any reasonable number such as 6 pairs, 7 pairs or 9 pairs, etc., and the present application does not limit this.

[0046] Optionally, the first angle a can specifically be 5° - 10°, and preferably 10°; while the second angle b can specifically be -5° - -10°, and preferably -10°.

[0047] In an embodiment, the steam heating device 1 further includes a third steam pipe 14 arranged in parallel and spaced apart from the first steam pipe 12 and at least two spaced third steam injection pipes 15, and opposite ends of each of the third steam injection pipes 15 are respectively connected to the first cavity housing 11 and the third steam pipe 14, so as to be able to inject the third steam in the third steam pipe 14 into the first cavity through each third steam injection pipe 15, so as to increase the amount of steam contained in the first cavity, and further enhance the heating effect on the water to be heated in the first cavity.

[0048] Optionally, the position where each third steam injection pipe 15 is correspondingly connected to the first cavity housing 11 may specifically be between every two adjacent pairs of first steam injection pipes 13, so as to prevent damage to the dynamic balance of the mixing eddy current formed by each pair of the correspondingly arranged first steam injection pipes 13, ensure that a new eddy current state can be generated in the cavity at all times, and effectively increase the amount of steam in the first cavity, so as to increase the temperature of the water to be heated at the outlet.

[0049] Optionally, the extending direction of each third steam injection pipe 15 is perpendicular to the central axis of the first cavity.

[0050] Optionally, each third steam injection pipe 15 is connected to any reasonable position on the first cavity housing 11 that does not damage the mixing eddy current formed by each pair of the first steam injection pipes 13 correspondingly, that is, its extending direction does not point to the center of the mixing eddy current. The present application does not make any limitation thereto.

[0051] Optionally, the number of the third steam injection pipes 15 is specifically any reasonable number such as 5, 6, or 8, etc. The present application does not make any limitation thereto.

[0052] In an embodiment, the number of the second steam pipes 32 is two, and the extending directions of the two second steam pipes 32 are both parallel to the extending direction of the second cavity housing 31, and are respectively arranged at intervals on the opposite sides of the second cavity housing 31. For example, the two second steam pipes 32 are arranged in parallel at intervals on the left and right sides or the upper and lower sides of the second cavity housing 31.

[0053] Furthermore, as Figure 3 shown, at least two second steam injection pipes 33 connected to the second cavity housing 31 are correspondingly provided on each second steam pipe 32, and each second steam injection pipe 33 is specifically offset in a direction forming a third included angle c with the direction perpendicular to the extending direction of the first cavity housing 11.

[0054] It can be understood that when the water to be heated after one-time heating passes through the delivery pipe 20 and is input into the second cavity, its water pressure will inevitably suffer a certain degree of loss. Therefore, when the second steam injection pipes 33 connected to the second steam pipes 32 on different sides are offset in the same direction, it can ensure a certain degree of outlet water pressure after the second steam is mixed with the water to be heated.

[0055] Optionally, the number of the second steam injection pipes 33 correspondingly connected to the two second steam pipes 32 arranged at intervals on the opposite sides of the second cavity housing 31 is different.

[0056] Optionally, the total number of the second steam injection pipes 33 is less than the total number of the first steam injection pipes 13.

[0057] Optionally, the total number of the second steam injection pipes 33 is specifically any reasonable number such as 7, 9, or 11, and the present application does not limit this.

[0058] Optionally, the third included angle c can be 5° - 10°, and preferably 10°.

[0059] In an embodiment, the steam heating device 1 further includes a fourth steam pipe 34 arranged in parallel and spaced apart from the second steam pipe 32, and at least two spaced-apart fourth steam injection pipes 35. Each of the opposite ends of each fourth steam injection pipe 35 is respectively connected to the second cavity housing 31 and the fourth steam pipe 34, so as to be able to inject the fourth steam in the fourth steam pipe 34 into the second cavity through each fourth steam injection pipe 35, so as to increase the amount of steam contained in the second cavity, and further enhance the heating effect on the water to be heated in the second cavity.

[0060] Optionally, the position where each fourth steam injection pipe 35 is correspondingly connected to the second cavity housing 31 is specifically between every two adjacent pairs of second steam injection pipes 33, so as to be able to reduce the influence on the second steam ejected from the second steam injection pipes 33 while increasing the amount of steam in the second cavity.

[0061] Optionally, the steam pressure of the first steam correspondingly conveyed in the first steam pipe 12 is 0.1 - 0.15 Mpa greater than the steam pressure of the second steam correspondingly conveyed in the second steam pipe 32.

[0062] Optionally, the first to fourth steam pipes 34, or any two or three of them, are specifically correspondingly connected to the same steam pump, or the upper-stage medium-pressure steam pipe, that is, the steam parameters corresponding to the first to fourth steams, or any two or three of them, such as temperature and steam pressure, are the same.

[0063] In an embodiment, the steam heating device 1 further includes a water inlet pipe 40 and a drain pipe 50. The water inlet pipe 40 is specifically connected to the opening at one end of the first cavity housing 11 away from the conveying pipe 20, and the drain pipe 50 is connected to the opening at one end of the second cavity housing 31 away from the conveying pipe 20, so that the corresponding water pump can pump the water to be heated into the first cavity formed by the first cavity housing 11 through the water inlet pipe 40, and after passing through the conveying pipe 20, enter the second cavity formed by the second cavity housing 31, and flow out from the opening at one end of the second cavity housing 31 away from the conveying pipe 20, and be discharged into the production equipment of the next process through the drain pipe 50.

[0064] Further, a first butterfly valve 41 is also provided at one end of the water inlet pipe 40 close to the first cavity housing 11. In order to ensure that the water flow direction of the water to be heated in the steam heating device 1 always follows the designed direction, a check valve 42 is also installed at the first butterfly valve 41 of the water inlet pipe 40, and the check valve 42 is located between the first butterfly valve 41 and the first cavity housing 11, so as to prevent the water to be heated flowing into the first cavity from flowing back through the check valve 42, and effectively control the inflow of the water to be heated into the first cavity or stop the inflow into the first cavity by opening and closing the first butterfly valve 41.

[0065] Wherein, a second butterfly valve 51 is also provided at one end of the drain pipe 50 close to the second cavity housing 31, so as to control the outflow of the water to be heated from the second cavity or stop the outflow from the second cavity by opening and closing the second butterfly valve 51.

[0066] In an embodiment, a third butterfly valve 21 is provided at the middle position of the conveying pipe 20, so as to be used for maintenance operations on the first heater 10 and the second heater 30.

[0067] It should be noted that the check valve 42 specifically refers to a valve whose closing member is a circular valve flap and which blocks the reverse flow of the medium by its own weight and the medium pressure. It belongs to the category of automatic valves, also known as a non-return valve, one-way valve, reflux valve or isolation valve. The movement mode of the valve flap is divided into the lifting type and the swing type. The lifting check valve 42 is similar in structure to the globe valve, only lacking the valve stem that drives the valve flap. The medium flows in from the inlet end (lower side) and out from the outlet end (upper side). When the inlet pressure is greater than the sum of the valve flap weight and its flow resistance, the valve is opened. Conversely, the valve closes when the medium flows back. The swing check valve 42 has an inclined valve flap that can rotate around an axis, and its working principle is similar to that of the lifting check valve 42. The check valve 42 is commonly used as the bottom valve of a pumping device to prevent the backflow of water. When the check valve 42 is used in combination with a globe valve, it can play a role in safety isolation. The disadvantage is that the resistance is large and the sealing performance is poor when closed.

[0068] The butterfly valve is also called a flap valve. It is a simple-structured regulating valve. The butterfly valve that can be used for the on-off control of the medium in a low-pressure pipeline refers to a valve whose closing member (valve flap or butterfly plate) is a disc and which rotates around the valve shaft to achieve opening and closing. The valve can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil products, liquid metals and radioactive media. It mainly plays the role of cutting off and throttling in the pipeline. The closing member of the butterfly valve is a disc-shaped butterfly plate that rotates around its own axis in the valve body to achieve opening and closing or adjustment.

[0069] In one embodiment, the steam heating device 1 further includes: a steam supply device (not shown in the figure) and a steam delivery pipe 60. The steam delivery pipe 60, that is, the medium-pressure steam pipe mentioned above, is further connected to the first steam pipe 12 and the second steam pipe 32. Specifically, the steam supply device delivers medium-pressure steam, that is, the first steam and the second steam, to the first steam pipe 12 and the second steam pipe 32 through the steam delivery pipe 60.

[0070] Among them, medium-pressure steam generally refers to steam with a pressure range of 0.8 Mpa - 2.5 Mpa and a saturated steam temperature in the range of 174.52° - 224.99°. Generally, a pressure relief valve is also provided at the steam delivery pipe 60 to prevent equipment damage caused by excessive pressure in the pipeline.

[0071] It can be understood that the first heater 10 and the second heater 30 are the working cores of the entire steam heating device 1. Considering that the supply rate of warm water needs to reach 400 liters per minute, a multi-stage steam heating method is adopted. To ensure the heating efficiency and a sufficient heat exchange process, the designs of the first heater 10 and the second heater 30 are slightly different, and the specific difference lies in the installation angles and quantities of the first steam injection pipes 13 and the second steam injection pipes 33 correspondingly included in the first heater 10 and the second heater 30.

[0072] In other embodiments, the steam heating device 1 may further include one or more third heaters, and the number of the delivery pipes 20 may also be at least two. A delivery pipe 20 is connected between every two adjacent third heaters and between the third heater and the second heater 30, so as to be able to perform multi-stage heating on the water to be heated through any reasonable number of the first to third heaters. The present application does not make any limitations in this regard.

[0073] Further, when the water to be heated enters the first cavity of the first heater 10 through the check valve 42 in the water inlet pipe 40 and quickly fills it, medium-pressure steam, that is, the first steam (generally at 1.5 Mpa and 190°), will be synchronously introduced into the first steam pipe 12. Then, the first steam can enter the first cavity through the first steam injection pipe 13 and mix with the water to be heated to perform primary heating on it. Generally, during the heating process, the temperature of the water to be heated in the water inlet pipe 40 is about 20° on average, and after primary heating, the outlet temperature generally reaches about 40° - 45°.

[0074] Further, compared with the first heater 10, the heat required to heat the water to be heated from a low temperature to a medium temperature is higher than that from the medium temperature to the process temperature. Therefore, the number of the second steam injection pipes 33 used in the second heater 30 can be relatively smaller. Additionally, to prevent the warm water from flowing back due to the pressure in the second heater 30 being higher than that in the first heater 10, the pressure of the second steam supplied by the second heater 30 is generally about 0.1 - 0.15 Mpa smaller than the pressure of the first steam supplied by the first heater 10. Generally, after the water to be heated is heated once and then enters the second heater 30 for secondary heating, the temperature can reach about 60° - 75°, and the pressure of the drain pipe 50 is basically the same as that of the inlet pipe 40.

[0075] Please continue to refer to Figures 4 - 7 , in which, Figure 4 is Figure 2 a detailed structural schematic diagram of the first injection head in the first heater in Figure 5 is Figure 4 a cross-sectional schematic diagram of the primary injection part in the first injection head in Figure 6 is Figure 4 a cross-sectional schematic diagram of the secondary injection part in the first injection head in Figure 7 is Figure 4 the bottom view of the first injection head in

[0076] In an embodiment, a first injection head 131 is further provided at one end of the first steam injection pipe 13 close to the first cavity housing 11. The first injection head 131 includes a cylindrical primary injection part 1311 and a secondary injection part 1312 connected to each other. One end of the first steam injection pipe 13 is specifically inserted through a first through hole formed corresponding to the first cavity housing 11, so that the first injection head 131 extends into the first cavity, facilitating the injection of the steam in the first steam pipe 12 into the first cavity.

[0077] Among them, a plurality of first injection holes 13111 are further provided on the primary injection part 1311, and the plurality of first injection holes 13111 are arranged in at least two concentric circles on the primary injection part 1311; a plurality of second injection holes 13121 are also provided on the secondary injection part 1312, and the plurality of second injection holes 13121 are arranged in at least two concentric circle patterns on the secondary injection part 1312.

[0078] Optionally, the diameter of the first injection holes 13111 is smaller than the diameter of the second injection holes 13121, facilitating the injection of the first steam from the first injection holes 13111 into the second injection holes 13121 and then into the first cavity.

[0079] In one embodiment, the first spray head 131 further includes a first connecting portion 1313, which may specifically be in a partial cylindrical shape, and the corresponding radius is smaller than the radii of the primary spray portion 1311 and the secondary spray portion 1312, and it is connected between the primary spray portion 1311 and the secondary spray portion 1312, and a dispersion groove (not shown in the figure) is correspondingly formed. Among them, the dispersion groove is specifically a through groove, so that when the first steam is sprayed from the primary spray portion 1311 to the secondary spray portion 1312, part of the first steam can also overflow in a fan shape at the dispersion groove.

[0080] Similarly, at one end of the second steam injection pipe 33 close to the second cavity housing 31, there is also a second spray head 331, and the second spray head 331 includes a connected cylindrical tertiary spray portion (not shown in the figure), a quaternary spray portion (not shown in the figure), and a second connecting portion (not shown in the figure), and one end of the second steam injection pipe 33 penetrates through a second through hole correspondingly formed in the second cavity housing 31, so that the second spray head 331 is accommodated in the first cavity.

[0081] It can be understood that the second spray head 331 and the included tertiary spray portion, quaternary spray portion, and second connecting portion can be the same as the first spray head 131 and the primary spray portion 1311, secondary spray portion 1312, and first connecting portion 1313 respectively, and will not be elaborated here.

[0082] In addition, at one end of the third steam injection pipe 15 close to the first cavity housing 11, there is also a third spray head (not shown in the figure), and at one end of the fourth steam injection pipe 35 close to the second cavity housing 31, there is also a fourth spray head (not shown in the figure), and both the third spray head and the fourth spray head are the same as the first spray head 131, and will not be elaborated here.

[0083] It should be noted that common methods using steam as a heating medium generally have problems of high noise and severe pipeline vibration. The fundamental reason is that when steam mixes with the medium to be heated, the dispersion range of high-pressure steam is small, resulting in noise and vibration problems caused by friction between the steam and the medium to be heated. In order to ensure the stable operation of the heater, in the above solution, by setting one or more of the first to fourth spray heads, compared with the traditional steam direct-through solution, taking the first spray head 131 as an example, the first spray head 131 has a larger contact area with the first cavity, and when the steam enters the second spray hole 13121 through the first spray hole 13111, part of the steam will overflow in a fan shape at the dispersion groove, and there is also an arc-shaped chamfer at the outlet of the second spray hole 13121, and the remaining steam can also overflow from the opening and is also distributed in a fan shape.

[0084] In actual tests, the steam pressure of a single injection head can be controlled to about 0.3 Mpa when slight noise starts to appear, far exceeding the expected standard of 0.2 Mpa (the steam main pipe pressure is generally 1.5 Mpa and is evenly distributed among 12 injection heads, and the pressure of each steam injector is about 0.125 Mpa).

[0085] Please continue to refer to Figure 8 , Figure 8 which is the circuit schematic diagram of an embodiment of the control circuit in the steam heating device of the present application.

[0086] In one embodiment, the steam heating device 1 further includes a steam delivery pipe 60 and a control circuit. A steam pneumatic valve (not shown in the figure) is provided on the steam delivery pipe 60 and is specifically connected to the first steam pipe 12 and the second steam pipe 32, so as to be able to deliver the first steam and the second steam to the first steam pipe 12 and the second steam pipe 32, or stop delivering the first steam and the second steam to the first steam pipe 12 and the second steam pipe 32 by controlling the opening and closing of the steam pneumatic valve.

[0087] Among them, the control circuit further includes a first intermediate relay and a second intermediate relay. The first intermediate relay and the second intermediate relay are specifically coupled to the first butterfly valve 41 and the steam pneumatic valve, so that when the first butterfly valve 41 is opened, the first intermediate relay can trigger an action to open the steam pneumatic valve, and when the first butterfly valve 41 is closed, the second intermediate relay can trigger an action to close the steam pneumatic valve.

[0088] It can be understood that the control system involved in the steam heating device 1 mainly needs to include the control system of the water to be heated and the steam control system. For example, a water supply control module and a steam control module coupled to the control circuit.

[0089] Among them, the water supply control module is specifically used to control the opening and closing of the first butterfly valve 41, and correspondingly includes a signal transceiver for starting and stopping the supply of the water to be heated, as well as a first switch contact KG1 and a second switch contact KG2. The first switch contact KG1 can trigger an action when the first butterfly valve 41 is opened, and the second switch contact KG2 can trigger an action when the first butterfly valve 41 is closed; the steam control module is used to control the opening and closing of the steam pneumatic valve, and correspondingly includes a third switch contact KG3 and a fourth switch contact KG4. When the third switch contact KG3 triggers an action, it can open the steam pneumatic valve, and when the fourth switch contact KG4 triggers an action, it can close the steam pneumatic valve.

[0090] Furthermore, the signal receiver for starting and stopping the supply of water to be heated in the water supply control module can be specifically installed at the first butterfly valve 41 of the water inlet pipe 40. Once the valve here, that is, the closing of the first butterfly valve 41, is detected, the supply of medium-pressure steam can be stopped in a timely manner, that is, the steam pneumatic valve is closed. The purpose of this design is to reduce the liquid backflow in the first heater 10 and avoid damaging the check valve 42. The steam control module is respectively installed on the steam main pipe valves of the first heater 10 and the second heater 30, or on the steam pneumatic valves on the steam delivery pipe 60 to control the opening and closing actions of the medium-pressure steam.

[0091] Still further, the first intermediate relay can specifically include a first relay coil KA1 and a first normally open contact K11, and the second intermediate relay specifically includes a second relay coil KA2 and a second normally open contact K21. The control circuit further includes a first power supply terminal L1 and a first grounding terminal N1 to supply power to the control circuit through the first power supply terminal L1 and the first grounding terminal N1.

[0092] Specifically, the first power supply terminal L1 is connected to the first end of the third switch contact KG3, the first end of the fourth switch contact KG4, the first end of the first relay coil KA1, and the first end of the second relay coil KA2. The second end of the third switch contact KG3 is connected to the first end of the first normally open contact K11. The second end of the fourth switch contact KG4 is connected to the first end of the second normally open contact K21. The second end of the first relay coil KA1 is connected to the first end of the first switch contact KG1. The second end of the second relay coil KA2 is connected to the first end of the second switch contact KG2. The second ends of the first normally open contact K11, the second normally open contact K21, the first switch contact KG1, and the second switch contact KG2 are connected to the first grounding terminal N1.

[0093] It can be seen from this that when the first butterfly valve 41 is opened, the first switch contact KG1 will be triggered to act, enabling the first relay coil KA1 to be energized, and then the first normally open contact K11 is triggered to close, triggering the third switch contact KG3 to act and opening the steam pneumatic valve to realize heating the water to be heated. Conversely, when the first butterfly valve 41 is closed, the second switch contact KG2 will be triggered to act, enabling the second relay coil KA2 to be energized, and then the second normally open contact K21 is triggered to close, triggering the fourth switch contact KG4 to act and closing the steam pneumatic valve to stop heating.

[0094] Please refer to Figure 9 , Figure 9 which is the circuit schematic diagram of another embodiment of the control circuit in the steam heating device of the present application.

[0095] In one embodiment, the control circuit may specifically further include a third to a sixth intermediate relay, a second power supply terminal L2, and a second ground terminal N2. Among them, the third intermediate relay further includes a third relay coil KA3 and a third normally open contact K31. The fourth intermediate relay includes a fourth relay coil KA4 and a fourth normally open contact K41. The fifth intermediate relay includes a fifth relay coil KA5, a fifth normally open contact K51, a fifth normally closed contact K52, and a fifth interlock contact K53. The sixth intermediate relay includes a sixth relay coil KA6, a sixth normally open contact K61, a sixth normally closed contact K62, and a sixth interlock contact K63. The water supply control module includes a fifth switch contact KG5 and a sixth switch contact KG6, and the steam control module includes a seventh switch contact KG7 and an eighth switch contact KG8. And the corresponding connection relationship is specifically as Figure 6 shown and will not be elaborated here.

[0096] Then it can be understood that the fifth intermediate relay and the sixth intermediate relay can achieve interlocking through the fifth interlock contact K53 and the sixth interlock contact K63 to prevent misoperation. Specifically, the start and stop control of the steam pneumatic valve is realized by means of the third intermediate relay and the fourth intermediate relay, so as to facilitate a more reasonable installation layout of the third to sixth intermediate relays. For example, they are installed closer to the corresponding butterfly valve or pneumatic valve, which is convenient for circuit wiring.

[0097] The beneficial effect of this application is that, different from the prior art, the steam heating device provided by this application includes: a first heater, a second heater, and a conveying pipe. The first heater includes a first cavity housing, a first steam pipe, and at least two spaced-apart first steam injection pipes. Opposite ends of each first steam injection pipe are respectively connected to the first cavity housing and the first steam pipe. The second heater includes a second cavity housing, a second steam pipe, and at least two spaced-apart second steam injection pipes. Opposite ends of each second steam injection pipe are respectively connected to the second cavity housing and the second steam pipe. When the water to be heated enters from one end opening of the first cavity housing and is discharged through the conveying pipe to one end opening of the second cavity housing, each first steam injection pipe sprays the first steam in the first steam pipe into the first cavity formed by the first cavity housing to perform a primary heating on the water to be heated. Each second steam injection pipe sprays the second steam in the second steam pipe into the second cavity formed by the second cavity housing to perform a secondary heating on the water to be heated after the primary heating. Thus, by integrating the steam pipeline into the conveying pipeline of the water to be heated and adopting a multi-stage heating method, the efficiency of steam heating can be effectively improved, and the waste generated when the water to be heated flows in different processes can be avoided.

[0098] The above are only the embodiments of the present application, and do not thus limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall similarly be included within the patent protection scope of the present application.

Claims

1. A steam heating device, characterized in that, the steam heating device includes: A first heater, including a first cavity housing, a first steam pipe, and at least two spaced-apart first steam injection pipes. Opposite ends of each of the first steam injection pipes are respectively connected to the first cavity housing and the first steam pipe; wherein, each of the first steam injection pipes is offset in a direction forming a first angle or a second angle with respect to a direction perpendicular to the extending direction of the first cavity housing, and the offset directions of the first steam injection pipes corresponding to the first steam pipes on different sides of the first cavity housing are different; A conveying pipe, one end of the conveying pipe is connected to the first cavity housing; A second heater, including a second cavity housing, a second steam pipe, and at least two spaced-apart second steam injection pipes. Opposite ends of each of the second steam injection pipes are respectively connected to the second cavity housing and the second steam pipe. The second cavity housing is connected to the other end of the conveying pipe. When the water to be heated enters from one end opening of the first cavity housing and is discharged through the conveying pipe to one end opening of the second cavity housing, each of the first steam injection pipes injects the first steam in the first steam pipe into the first cavity formed correspondingly in the first cavity housing to perform primary heating on the water to be heated, and each of the second steam injection pipes injects the second steam in the second steam pipe into the second cavity formed correspondingly in the second cavity housing to perform secondary heating on the water to be heated after primary heating; wherein, the number of the second steam pipes is two, the extending directions of the two second steam pipes are both parallel to the extending direction of the second cavity housing, and are respectively spaced apart on opposite sides of the second cavity housing, and each of the second steam injection pipes is offset in a direction forming a third angle with respect to a direction perpendicular to the extending direction of the second cavity housing; A first spray head is further provided at one end of the first steam injection pipe close to the first cavity housing. The first spray head includes a cylindrical primary spray portion and a secondary spray portion connected to each other, and one end of the first steam injection pipe penetrates through a first through hole formed correspondingly in the first cavity housing so that the first spray head is accommodated in the first cavity; A plurality of spaced-apart first spray holes are provided on the primary spray portion, and the plurality of first spray holes are arranged in at least two concentric circles on the primary spray portion. A plurality of spaced-apart second spray holes are provided on the secondary spray portion, and the plurality of second spray holes are arranged in at least two concentric circles on the secondary spray portion.

2. The steam heating device according to claim 1, characterized in that, the number of the first steam pipes is two, the extending directions of the two first steam pipes are both parallel to the extending direction of the first cavity housing, and are respectively spaced apart on opposite sides of the first cavity housing.

3. The steam heating device according to claim 1, characterized in that, The steam heating device further includes a third steam pipe arranged in parallel and spaced apart from the first steam pipe, and at least two spaced-apart third steam injection pipes. Opposite ends of each of the third steam injection pipes are respectively connected to the first cavity housing and the third steam pipe.

4. The steam heating device according to claim 1, wherein, the steam heating device further includes a fourth steam pipe arranged in parallel and spaced apart from the second steam pipe, and at least two spaced-apart fourth steam injection pipes. Opposite ends of each of the fourth steam injection pipes are respectively connected to the second cavity housing and the fourth steam pipe.

5. The steam heating device according to any one of claims 1-4, wherein, the steam heating device further includes a water inlet pipe and a drain pipe. The water inlet pipe is connected to an opening at one end of the first cavity housing away from the conveying pipe, and the drain pipe is connected to an opening at one end of the second cavity housing away from the conveying pipe. A first butterfly valve and a check valve are sequentially arranged at intervals near the first cavity housing at one end of the water inlet pipe, and a second butterfly valve is arranged near the second cavity housing at one end of the drain pipe.

6. The steam heating device according to claim 5, wherein, a third butterfly valve is arranged at the middle position of the conveying pipe.

7. The steam heating device according to claim 6, wherein, the steam heating device further includes a steam conveying pipe and a control circuit. A steam pneumatic valve is provided on the steam conveying pipe, and it is connected to the first steam pipe and the second steam pipe. The control circuit includes a first intermediate relay and a second intermediate relay. The first intermediate relay and the second intermediate relay are coupled to the first butterfly valve and the steam pneumatic valve, so that when the first butterfly valve is opened, the first intermediate relay is triggered to actuate to open the steam pneumatic valve, and when the first butterfly valve is closed, the second intermediate relay is triggered to actuate to close the steam pneumatic valve.

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