A multi-gradient heating system

Abstract

The present application relates to a kind of multi-gradient heating system, comprising: heat network circulating water path;For heating heat network circulating water, first heat network heater located in the upstream of heat network circulating water path;At least two second heat network heaters are sequentially communicated downstream of first heat network heater, to heat network circulating water is heated;At least two second heat network heaters are interval arranged;From the upstream to the downstream of heat network circulating water path, first heat network heater and at least two second heat network heaters divide heat network circulating water path into first heat network section, second heat network section and at least one third heat network section;The water temperature of first heat network section, second heat network section and third heat network section gradually increases.The present application can heat heat network circulating water path multiple times by first heat network heater and at least two second heat network heaters, so that the water temperature of each section of heat network circulating water path is different, to meet the user with different water temperature requirements.

Description

Technical Field

[0001] This invention relates to the field of heating technology, and more particularly to a multi-gradient heating system. Background Technology

[0002] Power plants generate a large amount of waste steam during production, which contains significant vaporization potential. This waste steam is typically discharged into the atmosphere through cooling equipment, resulting in wasted heat. Therefore, recovering waste heat from power plant waste steam is of great importance in reducing energy loss and environmental pollution.

[0003] In waste steam recovery heating systems, waste steam is generally used to heat the water in the heating network. However, different users have different heating temperature requirements, and the existing heating system cannot meet the heat requirements of different users. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a multi-gradient heating system, which solves the technical problem of not being able to meet the different temperature requirements of users.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the main technical solutions adopted by the present invention include:

[0008] A multi-gradient heating system, comprising:

[0009] The heating network circulating water system;

[0010] The first heating network heater is located upstream of the heating network circulating water path and is used to heat the water in the heating network circulating water path.

[0011] At least two second heat network heaters are sequentially connected downstream of the first heat network heater to heat the water in the heat network circulation water path; from upstream to downstream of the heat network circulation water path, the first heat network heater and the at least two second heat network heaters divide the heat network circulation water path into a first heat network segment, a second heat network segment and at least one third heat network segment;

[0012] The water temperature in the first heating network segment, the second heating network segment, and the third heating network segment gradually increases.

[0013] Preferably, it also includes a first heating branch, the inlet of which is connected to the first heating network segment, and the return end of which is connected to the return end of the heating network circulating water circuit.

[0014] Preferably, it also includes a second heating branch, the inlet of which is connected to the second heating network section, and the return end of which is connected to the return end of the heating network circulating water circuit.

[0015] Preferably, it further includes at least one third heating branch, the inlet of which is connected to the second heating network section, and the return end of which is connected to the return end of the heating network circulating water circuit.

[0016] Each of the third heating branches is provided with a first heat exchange branch and at least one first heat exchanger. The first heat exchanger transfers the heat from the third heating branch to the first heat exchange branch to provide heat to the user.

[0017] Preferably, it further includes at least one fourth heating branch, the inlet of which is connected to the third heating network segment, and the return end of which is connected to the return end of the heating network circulating water circuit.

[0018] Each of the fourth heating branches is provided with a second heat exchange branch and at least one second heat exchanger. The second heat exchanger transfers the heat from the fourth heating branch to the second heat exchange branch to provide heat to the user.

[0019] Preferably, there are two second heating network heaters and one third heating network segment.

[0020] Preferably, it also includes a steam turbine;

[0021] The first heat network heater is connected to the exhaust port of the last stage blade of the steam turbine, and the second heat network heater is connected to the intermediate heating exhaust port of the steam turbine.

[0022] Preferably, the heating network circulating water circuit is further equipped with a circulating pump to circulate the water in the heating network circulating water circuit.

[0023] Preferably, the first heating network heater is a condenser.

[0024] Preferably, it also includes a condensate pump, the inlet of which is connected to the drain of the condenser, and the drain is connected to the return of the heating network circulating water circuit.

[0025] (III) Beneficial Effects

[0026] The beneficial effects of this invention are:

[0027] (1) The present invention can heat the heat network circulating water circuit multiple times through a first heat network heater and at least two second heat network heaters, so that the water temperature of each section of the heat network circulating water circuit is different, so as to meet the different water temperature requirements of users.

[0028] (2) The present invention provides heating to users through multiple heating branches, which can meet the needs of users with multiple temperature requirements.

[0029] (3) The present invention heats the water in the heating network circulation water circuit by using the exhaust steam of the steam turbine, so as to make full use of the heat of the exhaust steam and reduce energy loss. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of the multi-gradient heating system of the present invention.

[0031] [Explanation of Labels in the Attached Image]

[0032] 1: Steam turbine; 2: First heating network heater; 3: Second heating network heater; 5: Second heat exchanger; 7: First heat exchanger; 8: Circulating pump; 9: Condensate pump; 41: First heating network section; 42: Second heating network section; 43: Third heating network section. Detailed Implementation

[0033] To better explain and facilitate understanding of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Example

[0035] like Figure 1 As shown, a multi-gradient heating system includes: a heating network circulating water path; a first heating network heater 2 located upstream of the heating network circulating water path for heating water within the system; at least two second heating network heaters 3 sequentially connected downstream of the first heating network heater for heating water within the system; the at least two second heating network heaters 3 are spaced apart; from upstream to downstream, the first heating network heater 2 and the at least two second heating network heaters 3 divide the heating network circulating water path into a first heating network segment 41, a second heating network segment 42, and at least one third heating network segment 43; the water temperature in the first heating network segment 41, the second heating network segment 42, and the third heating network segment 43 gradually increases.

[0036] Power plants generate a large amount of waste steam during production, which contains significant vaporization potential. This waste steam is typically discharged into the atmosphere through cooling equipment, resulting in wasted heat. Therefore, recovering waste heat from power plant waste steam is of great importance in reducing energy loss and environmental pollution.

[0037] In waste steam recovery heating systems, waste steam is generally used to heat the water in the heating network. However, different users have different heating temperature requirements, and the existing heating system cannot meet the heat requirements of different users.

[0038] The present invention can heat the heating network circulating water circuit multiple times through a first heating network heater 2 and at least two second heating network heaters 3, so that the water temperature of each section of the heating network circulating water circuit is different, so as to meet the needs of users with different water temperature requirements.

[0039] In this embodiment, there are two second heating network heaters 3, that is, there is one third heating network segment 43.

[0040] In this embodiment, the water temperature in the unheated heating network circulation water path is 40℃~50℃, the water temperature in the heating network circulation water after being heated by the first heating network heater is 65℃~75℃, the water temperature in the heating network circulation water path after being heated by the first second heating network heater 3 is 100℃~110℃, and the water temperature in the heating network circulation water path after being heated by the second second heating network heater 3 is 125℃~135℃.

[0041] In this embodiment, the first heating network segment 41, the second heating network segment 42, and the third heating network segment 43 can supply heat to users with different needs to meet their usage requirements.

[0042] Furthermore, such as Figure 1 As shown, it also includes a first heating branch, whose inlet end is connected to the first heating network section 41, and whose return end is connected to the return end of the heating network circulating water circuit. Heating is supplied to users with lower water temperature requirements through the first heating branch.

[0043] In this embodiment, the water temperature of the first heating branch is 65℃~75℃, which can be used by users who require hot water at a temperature of 65℃~75℃.

[0044] Furthermore, such as Figure 1 As shown, it also includes a second heating branch. The inlet of the second heating branch is connected to the second heating network section 42, and the return end is connected to the return end of the heating network circulating water circuit. The second heating branch can provide heating to users with higher water temperature requirements.

[0045] In this embodiment, the water temperature of the second heating branch is 100℃~110℃, which can be used by users who require hot water temperature of 100℃~110℃.

[0046] Furthermore, such as Figure 1 As shown, it also includes at least one third heating branch, the inlet of which is connected to the second heating network segment 42, and the return end of which is connected to the return end of the heating network circulating water circuit. Each third heating branch is correspondingly provided with a first heat exchange branch and at least one first heat exchanger 7. The first heat exchanger 7 transfers the heat from the third heating branch to the first heat exchange branch to provide heat to the user. In this embodiment, there is only one first heat exchanger 7. The third heating branch is connected to the heating channel of the first heat exchanger 7, and the heated channel of the first heat exchanger 7 is connected to the first heat exchange branch. The third heating branch converts heat to the first heat exchanger 7, and the first heat exchanger 7 then transfers the heat to the first heat exchange branch to provide heat to the user.

[0047] In this embodiment, the water temperature upstream of the third heating branch is 100℃~110℃. After passing through the first heat exchanger 7, the water temperature downstream of the third heating branch is 50℃~60℃. The water temperature before passing through the first heat exchanger 7 in the first heat exchange branch is 45℃~55℃. The water temperature after heat exchange in the first heat exchange branch through the first heat exchanger 7 is 60℃~70℃, so as to provide hot water for users who need a hot water temperature of 60℃~70℃.

[0048] Furthermore, such as Figure 1 As shown, it also includes at least one fourth heating branch, the inlet of which is connected to the third heating network segment 43, and the return end of which is connected to the return end of the heating network circulating water circuit. Each fourth heating branch is correspondingly provided with a second heat exchange branch and at least one second heat exchanger 5. The second heat exchanger 5 transfers the heat from the fourth heating branch to the second heat exchange branch to provide heat to the user. In this embodiment, there is only one second heat exchanger 5. The fourth heating branch is connected to the deheating channel of the second heat exchanger 5, and the heated channel of the second heat exchanger 5 is connected to the second heat exchange branch. The fourth heating branch transfers heat to the second heat exchanger 5, and the second heat exchanger 5 then transfers heat to the second heat exchange branch to provide heat to the user.

[0049] like Figure 1 As shown, in this embodiment, a fifth heating branch is also included. The inlet end of the fifth heating branch is connected to the third heating network segment 43, and the outlet end is connected to the return end of the heating network circulating water circuit. Heat is supplied to users through the fifth heating branch.

[0050] In this embodiment, the water temperature upstream of the fourth heating branch is 125℃~135℃. After passing through the second heat exchanger 5, the water temperature downstream of the fourth heating branch is 60℃~70℃. The water temperature before passing through the second heat exchanger 5 in the second heat exchange branch is 50℃~60℃. The water temperature after heat exchange in the second heat exchange branch through the second heat exchanger 5 is 80℃~90℃, so as to provide hot water for users who need a hot water temperature of 80℃~90℃.

[0051] Specifically, such as Figure 1 As shown, it also includes a steam turbine 1; a first heating network heater 2 is connected to the exhaust port of the last stage blades of the steam turbine, and a second heating network heater 3 is connected to the intermediate heating exhaust port of the steam turbine 1. In this embodiment, the second heating network heater 3 is a heat exchange heater, in which the exhaust steam of the steam turbine 1 is transferred to the first heating network heater 1, and the first heating network heater 1 then transfers the heat to the circulating water of the heating network.

[0052] In this embodiment, as Figure 1 As shown, a circulation pump 8 is also provided in the heating network circulating water circuit to circulate the water in the heating network circulating water circuit. The circulation pump 8 increases the circulation of the heating network circulating water circuit so that the water in the heating network circulating water circuit can be heated by the first heating network heater 2 and the second heating network heater 3.

[0053] Furthermore, the first heating network heater 2 is a condenser.

[0054] Furthermore, such as Figure 1 As shown, it also includes a condensate pump 9, the inlet of which is connected to the drain of the condenser, and the drain is connected to the return of the heating network circulating water circuit.

[0055] When this invention is working, as Figure 1 As shown, the heat of the exhaust steam from the turbine 1 is transferred to the first heating network heater 2. The first heating network heater 2 transfers the heat to the water in the heating network circulating water circuit. The water temperature after being heated by the first heating network heater 2 is 65℃~75℃. At this time, part of the water in the heating network circulating water circuit flows to the first heating branch, which can supply heat to users with a demand of 65℃~75℃ through the first heating branch. The other part of the water in the heating network circulating water circuit flows to the end of the first second heating network heater 3.

[0056] The intermediate heating exhaust of steam turbine 1 transfers heat to the first second heating network heater 3. The first second heating network heater 3 then transfers heat to the water in the heating network circulating water circuit. The water heated by the first second heating network heater 3 reaches a temperature of 100℃~110℃. At this time, part of the water in the heating network circulating water circuit flows to the second heating branch, which can supply heat to users with a demand of 100℃~110℃. Simultaneously, part of the water flows to the third heating branch. The water in the third heating branch transfers heat to the first heat exchanger 7. The first heat exchanger 7 then transfers heat to the first heat exchange branch. The water in the first heat exchange branch, after heat exchange by the first heat exchanger 7, reaches a temperature of 60℃~70℃, which can then supply heat to users with a demand of 60℃~70℃. At the same time, part of the water in the heating network circulating water circuit flows into the second second heating network heater 3.

[0057] The intermediate heating exhaust from turbine 1 transfers heat to the second heating network heater 3. The second heating network heater 3 then transfers this heat to the water in the heating network circulating water circuit. The water temperature after being heated by the second heating network heater 3 is 125℃~135℃. Part of the water in the heating network circulating water circuit flows to the fourth heating branch. The fourth heating branch transfers heat to the second heat exchanger 5. The second heat exchanger 5 then transfers the heat to the second heat exchange branch, where the water temperature is 80℃~90℃, supplying heat to users requiring 80℃~90℃. Simultaneously, some water flows into the fifth heating branch, where the water temperature is 125℃~135℃, supplying heat to users requiring 125℃~135℃.

[0058] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0059] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0060] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," or "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0061] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0062] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A multi-gradient heating system, characterized in that, include: The heating network circulating water system is used for heating. The first heating network heater (2) is used to heat the water in the heating network circulating water circuit. At least two second heat network heaters (3) are sequentially connected downstream of the first heat network heater (2) to heat the water in the heat network circulation water circuit multiple times so that the water temperature in each section of the heat network circulation water circuit is different, so as to meet the different water temperature requirements of users. The exhaust port of the last stage blade of the steam turbine (1) is connected to the first heat network heater (2), and the heat of the exhaust steam of the steam turbine (1) is transferred to the first heat network heater (2). The intermediate heating exhaust outlet of the steam turbine (1) is connected to the second heat network heater (3), and the intermediate heating exhaust of the steam turbine (1) transfers the heat to the second heat network heater (3). From upstream to downstream of the heat network circulation water circuit, the first heat network heater (2) and the at least two second heat network heaters (3) divide the heat network circulation water circuit into a first heat network section (41), a second heat network section (42), and at least one third heat network section (43). The water temperature in the first heating network segment (41), the second heating network segment (42), and the third heating network segment (43) gradually increases; It also includes a first heating branch, the inlet of which is connected to the first heating network section (41), and the return end is connected to the return end of the heating network circulating water circuit. It also includes a second heating branch, the inlet of which is connected to the second heating network section (42), and the return end is connected to the return end of the heating network circulating water circuit; It also includes at least one third heating branch, the inlet end of which is connected to the second heating network section (42), and the return end is connected to the return end of the heating network circulating water circuit. Each of the third heating branches is provided with a first heat exchange branch and at least one first heat exchanger (7). The first heat exchanger (7) transfers the heat from the third heating branch to the first heat exchange branch to provide heat for the user. It also includes at least one fourth heating branch, the inlet of which is connected to the third heating network segment (43), and the return end is connected to the return end of the heating network circulating water circuit. Each of the fourth heating branches is provided with a second heat exchange branch and at least one second heat exchanger (5). The second heat exchanger (5) transfers the heat from the fourth heating branch to the second heat exchange branch to provide heat for users. The first heating network heater (2) transfers heat to the water in the heating network circulating water circuit. The water temperature after being heated by the first heating network heater (2) is 65℃~75℃. At this time, part of the water in the heating network circulating water circuit flows to the first heating branch, which can supply heat to users with a demand of 65℃~75℃ through the first heating branch. The other part of the water in the heating network circulating water circuit flows to the end of the first second heating network heater (3). The first second heating network heater (3) transfers heat to the water in the heating network circulating water circuit. The water temperature after being heated by the first second heating network heater (3) is 100℃~110℃. At this time, part of the water in the heating network circulating water circuit flows to the second heating branch, which can supply heat to users with a demand of 100℃~110℃ through the second heating branch. At the same time, part of the water flows to the third heating branch. The water in the third heating branch transfers heat to the first heat exchanger (7). The first heat exchanger (7) transfers heat to the first heat exchange branch. The water temperature in the first heat exchange branch after heat exchange by the first heat exchanger (7) is 60℃~70℃, which can supply heat to users with a demand of 60℃~70℃. At the same time, part of the water in the heating network circulating water flows into the second second heating network heater (3). The second second heating network heater (3) transfers heat to the water in the heating network circulation water circuit. The water temperature after being heated by the second second heating network heater (3) is 125℃~135℃. Part of the water in the heating network circulation water circuit flows to the fourth heating branch. The fourth heating branch transfers heat to the second heat exchanger (5). The second heat exchanger (5) transfers heat to the second heat exchange branch. The water temperature in the second heat exchange branch is 80℃~90℃, which is used to supply heat to users with a demand of 80℃~90℃. At the same time, part of the water flows into the fifth heating branch. The water temperature in the fifth heating branch is 125℃~135℃, which is used to supply heat to users with a demand of 125℃~135℃.

2. The multi-gradient heating system as described in claim 1, characterized in that, There are two second heating network heaters (3) and one third heating network segment (43).

3. The multi-gradient heating system as described in any one of claims 1 or 2, characterized in that, The heating network circulating water circuit is also equipped with a circulating pump (8) to make the water in the heating network circulating water circuit circulate.

4. The multi-gradient heating system as described in any one of claims 1 or 2, characterized in that, The first heating network heater (2) is a condenser.

5. The multi-gradient heating system as described in claim 4, characterized in that, It also includes a condensate pump (9), the inlet of which is connected to the drain of the condenser, and the drain is connected to the return of the heating network circulating water circuit.

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