Energy storage type steam system based on steam heat accumulator

Abstract

The utility model discloses an energy storage type steam system based on a steam heat accumulator, which comprises a softened water supply unit, a gas steam supply unit, an electric steam boiler, the steam heat accumulator and a second thermal deaerator, the steam distribution cylinder is connected with the second thermal deaerator through a second steam pipeline, water supply of the first thermal deaerator is divided into two paths, the first path is connected with the gas steam boiler through a second water supply pipeline, and the second path is connected with the electric steam boiler through a third water supply pipeline. The electric steam boiler is used for supplying steam in an auxiliary mode, steam can be stored in the off-peak electricity period, the stored steam is used for supplying steam, the steam heat accumulator has the peak load shifting function, the proportion of absorbing green electricity is increased, gas consumption is reduced, energy is saved, emission is reduced, and the influence of steam load fluctuation on the gas steam boiler is eliminated. And the service life of the gas-steam boiler is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of steam supply, in particular to an energy storage type steam system based on a steam accumulator. Background Art

[0002] At present, steam is a special energy medium commonly used in industrial production and civil construction, and it is irreplaceable. For corporate production, steam boilers are often used to provide steam to meet production needs. For the steam system, the stability of steam flow, pressure, temperature and other parameters has a great impact on the product quality in the production process of the enterprise. It is inevitable to encounter fluctuations during the operation of the boiler, and even steam supply failures may occur. In addition, for intermittent operation companies that adopt a two-shift work system, the steam supply mode is difficult to adjust during shift changes. The traditional steam supply operation mode through intermittent operation with steam stop and small flow hot standby has serious energy waste problems. Furthermore, the environmental protection and operating cost pressures of gas boilers are increasingly valued by companies. Summary of the invention

[0003] In view of this, the utility model proposes an energy storage type steam system based on a steam accumulator.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The energy storage steam system based on the steam accumulator described in the utility model comprises a softened water supply unit and a gas steam supply unit, wherein the softened water supply unit comprises a softened water device, a softened water tank and a first thermal deaerator; the gas steam supply unit comprises a gas steam boiler and a steam cylinder; the energy storage steam system further comprises an electric steam boiler, a steam accumulator and a second thermal deaerator connected to the softened water tank, and a second oxygen storage pump is provided on the second water supply pipeline between the softened water tank and the second thermal deaerator;

[0006] The steam sub-cylinder is connected to the second thermal deaerator through the second steam pipeline, and the second thermal deaerator is connected to the steam accumulator through the first water supply pipeline; the water supply of the first thermal deaerator is divided into two routes, the first route is connected to the gas steam boiler through the second water supply pipeline, and the second route is connected to the electric steam boiler through the third water supply pipeline; the third steam pipeline of the electric steam boiler is connected to the steam sub-cylinder, and the third steam pipeline has a branch, and the branch is connected to the steam accumulator; the steam outlet of the steam accumulator is connected to the steam sub-cylinder through the fourth steam pipeline.

[0007] The beneficial effect is: the utility model uses electric steam boilers to assist in steam supply, and can store steam during off-peak hours, and use the stored steam to supply steam in other periods. The steam accumulator has the effect of shaving peaks and filling valleys, thereby increasing the proportion of green electricity consumed, reducing gas consumption, saving energy and reducing emissions, and to a certain extent eliminating the impact of steam load fluctuations on gas steam boilers, thereby extending the service life of gas steam boilers.

[0008] Preferably, the steam accumulator is provided with a steam distribution main pipe connected to the branch of the third steam pipeline and a plurality of vertically downward steam distribution branches, each of which is connected to the steam distribution main pipe; wherein a first valve is provided on the branch, a second valve is provided on the third steam pipeline located at the rear side of the branch, and a third valve is provided on the fourth steam pipeline. The beneficial effect is that the utility model utilizes the steam distribution pipe to achieve uniform distribution of steam in the steam accumulator, so that saturated steam is formed in the steam accumulator. In addition, the utility model can control the opening and closing states of the three valves, utilize the electric steam boiler to store heat during the off-peak hours at night, increase the proportion of green electricity, reduce natural gas energy consumption, and save energy and reduce emissions.

[0009] Preferably, a first liquid level sensor is provided in the steam accumulator for monitoring the water level in the steam accumulator; a second liquid level sensor is provided in the softened water tank for monitoring the liquid level in the softened water tank; a flow meter is provided on the tap water inlet pipe of the softened water equipment for monitoring the amount of water entering the softened water tank; a first temperature sensor is provided in the first thermal deaerator, and a second temperature sensor is provided in the second thermal deaerator. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the utility model. DETAILED DESCRIPTION

[0011] The following is a detailed description of an embodiment of the utility model in conjunction with the accompanying drawings. This embodiment is implemented on the premise of the technical solution of the utility model, and a detailed implementation method and a specific operation process are given, but the protection scope of the utility model is not limited to the following embodiment.

[0012] It should be noted that, in the description of the present utility model, relational terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0013] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected" and "connection" that may appear should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0014] like Figure 1 As shown, the energy storage steam system based on the steam accumulator described in the utility model includes a softened water supply unit and a gas steam supply unit, the softened water supply unit includes a softened water device 1, a softened water tank 2 and a first thermal deaerator 3, the softened water tank 2 is connected to the first thermal deaerator 3 through a first water supply pipeline L1, and a first deaerator pump P1 is provided on the first water supply pipeline L1; the gas steam supply unit includes a gas steam boiler 4 and a steam cylinder 5, the gas steam boiler 4 is connected to the steam cylinder 5 through a first steam pipeline Z1, the steam cylinder 5 is connected to the first thermal deaerator 3 through a fifth steam pipeline Z5, and a steam pressure reducing valve group is provided on the fifth steam pipeline Z5 to provide the first thermal deaerator 3 with steam required for deoxygenation;

[0015] The utility model also includes an electric steam boiler 6, a steam accumulator 7 and a second thermal deaerator 8 connected to a softened water tank 2. A second oxygen storage pump P2 is provided on a second water supply pipeline L2 between the softened water tank 2 and the second thermal deaerator 8; a steam cylinder 5 is connected to the second thermal deaerator 8 through a second steam pipeline Z2, and a steam pressure reducing valve group is provided on the second steam pipeline Z2 to provide the second thermal deaerator 8 with steam required for deoxygenation; the second thermal deaerator 8 is connected to the steam accumulator 7 through a first water supply pipeline, and a first water supply pump P3 is provided on the first water supply pipeline; the water supply of the first thermal deaerator 3 is divided into two The first water supply line is connected to the gas steam boiler 4 through the second water supply line, and the second water supply line has a second water supply pump P4 to provide water for the gas steam boiler 4; the second water supply line is connected to the electric steam boiler 6 through the third water supply line, and the third water supply line has a third water supply pump P5 to provide water for the electric steam boiler 6; the third steam line Z3 of the electric steam boiler 6 is connected to the steam cylinder 5 to provide steam for the user; the third steam line Z3 has a branch line, and the branch line is connected to the steam accumulator 7 to realize steam storage; the steam outlet of the steam accumulator 7 is connected to the steam cylinder 5 through the fourth steam line Z4.

[0016] Combination Figure 1It can be seen that the steam accumulator 7 of the utility model is provided with a steam distribution main pipe connected to the branch of the third steam pipeline Z3 and a plurality of vertically downward steam distribution branches, each steam distribution branch pipe is connected to the steam distribution main pipe, so that the steam distribution is more uniform, thereby realizing the steam energy storage of the steam accumulator 7; wherein, a first valve F1 is provided on the branch, a second valve F2 is provided on the third steam pipeline Z3 located at the rear side of the branch, and a third valve F3 is provided on the fourth steam pipeline Z4.

[0017] In actual installation, two first feedwater pumps P3, second feedwater pumps P4, third feedwater pumps P5, first deaerator pumps P1 and second deaerator pumps P2 are used, that is, each pump is a backup during operation, and can be switched to another pump when a failure occurs to meet the normal operation of the entire system. In addition, the first feedwater pump P3, the second feedwater pump P4 and the third feedwater pump P5 are all variable frequency anti-cavitation boiler feedwater pumps.

[0018] A first liquid level sensor is provided in the steam accumulator 7 for monitoring the water level in the steam accumulator; a second liquid level sensor is provided in the softened water tank 2 for monitoring the liquid level in the softened water tank; a flow meter is provided on the tap water inlet pipeline of the softened water equipment 1 for monitoring the amount of water entering the softened water tank; a first temperature sensor is provided in the first thermal deaerator 3, and a second temperature sensor is provided in the second thermal deaerator;

[0019] The signal output ends of the first liquid level sensor, the second liquid level sensor, the flow meter, the first temperature sensor and the second temperature sensor are all connected to the signal input end of the controller, and the control output end of the controller is connected to the control input ends of the first water supply pump, the second water supply pump, the third water supply pump and the first deaeration pump and the second deaeration pump.

[0020] When the liquid level in the softened water tank 2 is lower than the minimum liquid level, softened water is added to the softened water tank until the maximum liquid level is reached; the temperature of the first thermal deaerator 3 and the second thermal deaerator 8 is controlled at 102°C ~ 104°C, when the temperature is lower than 102°C, the steam intake is appropriately increased; when the temperature is higher than 104°C, the softened water intake can be appropriately increased; when the liquid level of the thermal deaerator is higher than the maximum liquid level, the deaerator pump is turned off and the water intake is stopped.

[0021] It should be pointed out that the above-mentioned controller can be a general-purpose processor, a special-purpose processor, a conventional processor, a digital signal processor (DSP), multiple microprocessors, one or more microprocessors associated with a DSP core, a controller, a microcontroller, an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) circuit, etc. It can also be a programmable logic controller (i.e., PLC) or an industrial computer.

[0022] The working process and principle of the utility model are as follows: the softening water equipment 1 softens the tap water and stores it in the softening water tank 2. The water in the softening water tank 2 is divided into two paths, one path is supplied to the first thermal deaerator 3 through the first deaerator pump P1, and the other path is supplied to the second thermal deaerator 8 under the action of the second deaerator pump P2; the hot water outlet after deoxygenation of the first thermal deaerator is divided into two paths, one path is supplied to the gas steam boiler 4 through the second water supply pump P4, the gas steam boiler 4 heats the water to generate hot saturated steam, and sends it to the steam cylinder 5 for steam users; in addition, a part of the steam in the steam cylinder 5 is connected to the second thermal deaerator 8 through the second steam pipeline Z2, providing the second thermal deaerator 8 with the steam required for deoxygenation; a part of the steam in the steam cylinder 5 is connected to the first thermal deaerator 3 through the fifth steam pipeline Z5, providing the first thermal deaerator 3 with the steam required for deoxygenation;

[0023] The first thermal deaerator 3 supplies water to the gas steam boiler 4, the gas steam boiler 4 generates steam, and part of the generated steam is supplied to the first thermal deaerator 3, and the cycle is repeated in this way, so that the continuous production of the gas steam boiler 4 can be achieved; similarly, the first thermal deaerator 3 supplies water to the electric steam boiler 6, the electric steam boiler 6 generates steam, and part of the steam enters the first thermal deaerator 3, and the cycle is repeated in this way, so that the continuous production of the electric steam boiler 6 can be achieved;

[0024] The second thermal deaerator directly supplies water to the steam accumulator 7, and the steam generated by the electric steam boiler 6 enters the steam accumulator 7, and the steam is used to heat the water and obtain saturated steam to realize steam energy storage. Among them, steam energy storage is preferably performed during the off-peak period at night. When the pressure in the steam accumulator 7 is higher than the heat release pressure but lower than the heat charging pressure, the gas steam boiler 4 can be closed, the electric steam boiler 6 and the first valve F1 can be opened, and the second valve F2 and the third valve F3 can be ensured to be in the closed state. The steam generated by the electric steam boiler 6 enters the steam accumulator 7 until the pressure of the steam accumulator 7 reaches the heat charging pressure, the heat storage is completed, and the first valve F1 is closed. If the electric steam boiler 6 is needed to supply steam, the second valve F2 is opened. If not, the first valve F1, the second valve F2 and the third valve F3 can all be closed.

[0025] When the steam accumulator 7 is needed to supply steam, the third valve F3 can be opened to allow steam to enter the steam cylinder 5 until the pressure in the steam accumulator 7 reaches the heat release pressure, thereby achieving heat release of the steam accumulator 7.

[0026] In actual operation, for intermittent operation enterprises, electric steam boiler 6 can be used to store steam during the off-peak period at night; during the off-peak period, steam can be first provided by steam accumulator 7. If the steam provided by steam accumulator 7 cannot meet the demand, the shortfall can be provided by gas steam boiler 4. For enterprises that use steam accumulator 7 to adjust the peak load, gas steam boiler 4 can be used to take charge of a certain proportion of the stable load, and the rest can be supplemented by electric steam boiler 6: during the off-peak period, gas steam boiler 4 + steam accumulator 7 are used to provide steam; during the off-peak period at night, gas steam boiler 4 + electric steam boiler 6 are used to provide steam, and part of the steam produced by electric steam boiler 6 during this period is stored in steam accumulator 7 for steam heat storage.

[0027] The utility model utilizes the electric steam boiler 6 to provide steam or store heat during off-peak hours. The steam heat accumulator 7 has the function of shaving peaks and filling valleys, thereby increasing the proportion of green electricity consumed, reducing gas consumption, saving energy and reducing emissions, and to a certain extent eliminating the impact of steam load fluctuations on the gas steam boiler 4, thereby extending the service life of the gas steam boiler 4.

[0028] Finally, it should be emphasized that the above is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments without creative work, or replace some of the technical features therein with equivalents. Therefore, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. An energy storage steam system based on a steam accumulator, comprising a softened water supply unit and a gas steam supply unit, wherein the softened water supply unit comprises a softened water device, a softened water tank and a first thermal deaerator; the gas steam supply unit comprises a gas steam boiler and a steam cylinder; characterized in that: The energy storage steam system further comprises an electric steam boiler, a steam accumulator and a second thermal deaerator connected to the softened water tank, and a second oxygen storage pump is provided on the second water supply pipeline between the softened water tank and the second thermal deaerator; The steam sub-cylinder is connected to the second thermal deaerator through the second steam pipeline, and the second thermal deaerator is connected to the steam accumulator through the first water supply pipeline; the water supply of the first thermal deaerator is divided into two routes, the first route is connected to the gas steam boiler through the second water supply pipeline, and the second route is connected to the electric steam boiler through the third water supply pipeline; the third steam pipeline of the electric steam boiler is connected to the steam sub-cylinder, and the third steam pipeline has a branch, and the branch is connected to the steam accumulator; the steam outlet of the steam accumulator is connected to the steam sub-cylinder through the fourth steam pipeline.

2. The energy storage steam system based on the steam accumulator according to claim 1 is characterized in that: The steam accumulator is provided with a steam distribution main pipe connected to the branch of the third steam pipeline and a plurality of vertically downward steam distribution branches, each of the steam distribution branches being connected to the steam distribution main pipe; The branch line is provided with a first valve, the third steam pipeline located at the rear side of the branch line is provided with a second valve, and the fourth steam pipeline is provided with a third valve.

3. The energy storage steam system based on the steam accumulator according to claim 1 is characterized in that: The steam accumulator is provided with a first liquid level sensor, the softened water tank is provided with a second liquid level sensor, and the tap water inlet pipe of the softened water equipment is provided with a flow meter; the first thermal deaerator is provided with a first temperature sensor, and the second thermal deaerator is provided with a second temperature sensor.

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