Constant-temperature hot water supply system and method utilizing steam waste heat

Abstract

The invention relates to the field of gypsum board auxiliary material preparation, in particular to a constant-temperature hot water supply system and method utilizing steam waste heat, the system comprises a steam source, a cold water source and at least three heat preservation storage tanks, the three heat preservation storage tanks are a heat storage tank, a liquid preparation tank and a liquid outlet tank respectively, and the heat storage tank is used for inputting and storing cold water; meanwhile, steam output by the steam source is used for heating cold water; the liquid preparation tank is used for inputting and storing cold water and heating the cold water by utilizing the hot water output by the heat storage tank; the liquid outlet tank is used for inputting and storing hot water flowing out of the liquid preparation tank and outputting constant-temperature hot water to the auxiliary material stirring tank. According to the embodiment of the invention, the heat storage tank is heated by using waste heat of water vapor generated during drying of the gypsum board, then the liquid preparation tank is heated by using hot water in the heat storage tank, and then the hot water in the liquid preparation tank is conveyed to the liquid outlet tank, so that temperature control is realized through the liquid preparation tank, and flow control is realized through the liquid outlet tank; therefore, stable hot water supply is realized by using an unstable heat source.

Description

Technical Field

[0001] The invention relates to the field of gypsum board auxiliary material preparation, and in particular to a constant temperature hot water supply system utilizing steam waste heat. Background Art

[0002] In the gypsum board industry, tap water is used to prepare auxiliary material solutions for gypsum board production. However, using cold water to prepare auxiliary material solutions is inefficient and affects the concentration of various auxiliary materials. Therefore, 30-40 degree hot water is used for preparation in the existing production process.

[0003] Since the flow rate of hot water required to prepare the auxiliary material solution is relatively high, the existing technology uses the waste heat of water vapor generated when drying gypsum boards to heat cold water. However, the heat and flow rate of water vapor generated when drying gypsum boards are uneven, making it difficult to control the temperature of the hot water for preparing the auxiliary material solution. Summary of the Invention

[0004] The object of the present invention is to provide a constant temperature hot water supply system using waste heat from steam, so as to solve the problem of how to prepare hot water with stable temperature using an unstable steam heat source.

[0005] In order to solve the above technical problems, the present invention specifically provides the following technical solutions:

[0006] A constant temperature hot water supply system utilizing waste heat from steam comprises a steam source, a cold water source, and at least three heat-insulating storage tanks, wherein the three heat-insulating storage tanks are: a heat storage tank, a liquid dispensing tank, and a liquid outlet tank;

[0007] The heat storage tank is provided with a steam heater inside, a steam regulating valve connected to a steam source and the steam heater outside, and a first water supply valve connected to a cold water source, for inputting and storing cold water and heating the cold water with steam output from the steam source;

[0008] The liquid distribution tank is provided with a hot water heater inside, and is provided with a hot water circulation pipeline and an external circulation pump connecting the heat storage tank and the hot water heater outside, as well as a second water supply valve connected to a cold water source, for inputting and storing cold water, and heating the cold water with the hot water output from the heat storage tank;

[0009] The outside of the liquid outlet tank is provided with a third water replenishment valve connected to the liquid mixing tank, and a liquid outlet regulating valve connected to the auxiliary material mixing tank, which are used to input and store hot water flowing out of the liquid mixing tank and output constant temperature hot water to the auxiliary material mixing tank.

[0010] Furthermore, the outside of the heat storage tank is provided with a one-way valve connected to a steam source, the one-way valve is arranged at the bottom of the heat storage tank, and the steam source is connected to the one-way valve, the steam heater and the atmosphere through a four-way valve. When the four-way valve is switched, the steam output by the steam source selectively enters one of the one-way valve, the steam heater and the atmosphere.

[0011] Furthermore, the outside of the liquid distribution tank is provided with a fourth water supply valve connected to the heat storage tank, and when the fourth water supply valve is opened, the hot water inside the heat storage tank flows into the inside of the liquid distribution tank.

[0012] Furthermore, a self-circulating pipeline and a self-circulating pump are provided on the outside of the liquid dispensing tank, and the two ends of the self-circulating pipeline are respectively connected to the top and bottom of the liquid dispensing tank. The self-circulating pump is used to drive the hot water inside the liquid dispensing tank to circulate in the self-circulating pipeline and inside the liquid dispensing tank.

[0013] Furthermore, the steam heater adopts a steam coil arranged inside the heat storage tank, or a jacket arranged inside the wall of the heat storage tank; the hot water heater adopts a steam coil arranged inside the liquid mixing tank, or a jacket arranged inside the wall of the liquid mixing tank.

[0014] Furthermore, temperature sensors and liquid level sensors are installed inside the heat storage tank, the liquid distribution tank and the liquid outlet tank, and pressure sensors and temperature sensors are installed on the steam pipeline between the steam source and the steam regulating valve. The temperature sensor, liquid level sensor, pressure sensor and temperature sensor are all connected to the controller.

[0015] Furthermore, a pressure relief valve is installed on the steam pipeline between the steam source and the steam regulating valve, and a safety valve is provided on the top of the heat storage tank.

[0016] A method for supplying constant temperature hot water using waste heat from steam, the method using the constant temperature hot water supply system of the claim comprising the following steps:

[0017] Liquid level control: monitors the liquid level inside each thermal storage tank, and then controls the first water supply valve, the second water supply valve, and the third water supply valve to open, close, or adjust the degree of opening and closing to ensure that the liquid level inside each thermal storage tank is maintained within a preset liquid level range;

[0018] Temperature control: monitoring the water temperature inside the liquid dispensing tank, and then turning on, off, or adjusting the operating power of the external circulation pump to maintain the water temperature inside the liquid dispensing tank within a temperature range greater than a first threshold and less than a second threshold;

[0019] Outputting hot water: When the water temperature inside the liquid mixing tank is greater than the first threshold value and less than the second threshold value, the third water supply valve is opened to allow the hot water inside the liquid mixing tank to enter the liquid outlet tank. At the same time, the hot water demand signal emitted by the auxiliary material mixing tank is monitored, and then the opening and closing degree of the liquid outlet regulating valve is opened, closed or adjusted to maintain the flow rate and flow rate of the hot water entering the auxiliary material mixing tank within the preset flow rate and flow rate range.

[0020] Furthermore, the heat storage tank is provided with a one-way valve connected to a steam source on the outside, the one-way valve being arranged at the bottom of the heat storage tank, and the steam source being connected to the one-way valve, the steam heater and the atmosphere via a four-way valve. The constant temperature hot water supply method further comprises the following steps:

[0021] When the water temperature inside the heat storage tank is lower than a third threshold, the four-way valve connects the steam source and the one-way valve to allow steam to directly flow into the heat storage tank and mix with the water;

[0022] When the water temperature inside the heat storage tank is greater than a third threshold, the four-way valve connects the steam source and the steam heater, so that steam passes through the steam heater to heat the water inside the heat storage tank;

[0023] When the water temperature inside the heat storage tank is greater than a fourth threshold, the four-way valve connects the steam source and the atmosphere, so that the steam is directly discharged into the atmosphere.

[0024] Furthermore, the liquid distribution tank is provided with a fourth water supply valve connected to the heat storage tank on the outside, and the constant temperature hot water supply method further includes the following steps:

[0025] When the water temperature inside the liquid dispensing tank is lower than a first threshold, the connection between the heat storage tank and the liquid dispensing tank is opened, so that the hot water inside the liquid storage tank directly flows into the interior of the liquid dispensing tank.

[0026] Compared with the prior art, this application has the following beneficial effects:

[0027] In an embodiment of the present invention, waste heat from water vapor generated during drying of gypsum boards is used to heat a heat storage tank, and hot water in the heat storage tank is then used to heat a liquid distribution tank. The hot water in the liquid distribution tank is then transferred to a liquid outlet tank. Temperature control is achieved through the liquid distribution tank, and flow control is achieved through the liquid outlet tank, thereby achieving a stable hot water supply using an unstable heat source. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other implementation drawings based on the provided drawings without inventive effort.

[0029] Figure 1 A system structure block diagram of an embodiment of the present invention;

[0030] Figure 2 This is a flow chart of temperature control of a liquid dispensing tank according to an embodiment of the present invention;

[0031] Figure 3 This is a temperature control flow chart of a heat storage tank according to an embodiment of the present invention;

[0032] The numbers in the figure represent the following:

[0033] 1-heat storage tank; 11-steam heater; 12-first water supply valve; 13-steam regulating valve; 14-check valve; 15-four-way valve; 2-liquid distribution tank; 21-hot water heater; 22-external circulation pump; 23-second water supply valve; 24-self-circulating pump; 25-fourth water supply valve; 3-liquid outlet tank; 31-third water supply valve; 32-liquid outlet regulating valve. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] In order to solve the problem of difficulty in obtaining hot water of stable temperature when using waste steam with unstable flow to heat cold water, this embodiment designs a constant temperature hot water supply system that utilizes steam waste heat, hereinafter referred to as the constant temperature hot water supply system. The system aims to utilize the waste heat of low-pressure steam generated during the drying process of gypsum boards to heat tap water and precisely control the temperature at 30-40°C, thereby preparing the auxiliary material solution required for gypsum board production.

[0036] refer to Figure 1 , the constant temperature hot water supply system includes: a steam source, a cold water source, and at least three insulated storage tanks.

[0037] The three thermal insulation storage tanks are: heat storage tank 1, liquid distribution tank 2 and liquid discharge tank 3.

[0038] The heat storage tank 1 is provided with a steam heater 11 inside, a steam regulating valve 13 connecting the steam source and the steam heater 11 outside, and a first water supply valve 12 connected to the cold water source. The heat storage tank 1 is used to input and store cold water, and at the same time use the steam output by the steam source to heat the cold water.

[0039] The liquid distribution tank 2 is provided with a hot water heater 21 inside, a hot water circulation pipeline and an external circulation pump 22 connecting the heat storage tank 1 and the hot water heater 21 outside, and a second water supply valve 23 connected to the cold water source. The liquid distribution tank 2 is used to input and store cold water, and at the same time use the hot water output by the heat storage tank 1 to heat the cold water.

[0040] The outside of the liquid outlet tank 3 is equipped with a third water replenishment valve 31 connected to the liquid mixing tank 2, and a liquid outlet regulating valve 32 connected to the auxiliary material mixing tank. The liquid outlet tank 3 is used to input and store hot water flowing out of the liquid mixing tank 2, and output constant temperature hot water to the auxiliary material mixing tank.

[0041] refer to Figure 2 and Figure 3 The constant temperature hot water supply method comprises the following steps:

[0042] Liquid level control: monitor the liquid level inside each insulated storage tank, and then control the first water supply valve 12, the second water supply valve 23 and the third water supply valve 31 to open, close or adjust the opening and closing degree to ensure that the liquid level inside each insulated storage tank is within the normal working range.

[0043] Temperature control: Monitor the water temperature inside the heat storage tank 1 and the liquid distribution tank 2, and then control the steam regulating valve 13 and the external circulation pump 22 to open, close, or adjust the opening and closing degree (power) to ensure that the internal temperature of the heat storage tank 1 and the liquid distribution tank 2 is within the normal operating range. For example, the temperature of the liquid distribution tank 2 is greater than the first threshold (30°C) and less than the second threshold (40°C), and the temperature of the heat storage tank 1 is greater than the third threshold (65°C) and less than the fourth threshold (95°C).

[0044] Output hot water: When the temperature of the liquid preparation tank 2 is greater than the first threshold and less than the second threshold, the third water supply valve 31 is opened to allow the hot water inside the liquid preparation tank 2 to enter the liquid outlet tank 3. At the same time, the hot water demand signal emitted by the auxiliary material mixing tank is monitored, and the liquid outlet regulating valve 32 is controlled to be opened, closed or the opening and closing degree is adjusted, so that the hot water inside the liquid outlet tank 3 can enter the auxiliary material mixing tank as needed to ensure the continuous production of auxiliary materials.

[0045] Preferably, the steam heater 11 adopts a steam coil arranged inside the heat storage tank 1, or a jacket arranged inside the wall of the heat storage tank 1; the hot water heater 21 adopts a steam coil arranged inside the liquid mixing tank 2, or a jacket arranged inside the wall of the liquid mixing tank 2.

[0046] Preferably, temperature sensors (such as Pt100 thermal resistors) and liquid level sensors (such as float level switches) are installed inside the heat storage tank 1, the liquid distribution tank 2 and the liquid outlet tank 3, so as to monitor the internal water temperature and liquid level of each insulation storage tank in real time.

[0047] Preferably, a pressure sensor, a temperature sensor and a pressure relief valve are installed on the steam pipeline between the steam source and the steam regulating valve 13, so that the controller can monitor the pressure and temperature of the steam and adjust the opening and closing degree of the steam regulating valve 13 according to the hot water temperature inside the heat storage tank 1.

[0048] Preferably, a safety valve is provided on the top of the heat storage tank 1 for timely discharging the high-pressure steam inside the heat storage tank 1.

[0049] Preferably, a self-circulating pipeline and a self-circulating pump 24 are provided outside the liquid mixing tank 2 to circulate the hot water at the bottom and top of the liquid mixing tank 2 itself, thereby making the water temperature in each area inside the liquid mixing tank 2 uniform.

[0050] Furthermore, when the constant temperature hot water supply system is initially started, or when the temperature of the external environment is low, the water temperature inside the heat storage tank 1 and the liquid distribution tank 2 often needs to rise quickly in order to achieve this purpose.

[0051] The outside of the heat storage tank 1 is provided with a one-way valve 14 connected to a steam source. Preferably, the one-way valve 14 is provided at the bottom of the heat storage tank 1. The steam source is connected to the one-way valve 14 and the steam heater 11 via a four-way valve 15. When necessary, steam can be directly introduced into the interior of the heat storage tank 1 without passing through the steam heater 11, thereby quickly increasing the water temperature inside the heat storage tank 1.

[0052] The outside of the liquid dispensing tank 2 is provided with a fourth water supply valve 25 connected to the heat storage tank 1. Preferably, the fourth water supply valve 25 is arranged on the top of the liquid dispensing tank 2. When necessary, the high-temperature hot water inside the heat storage tank 1 can be directly introduced into the interior of the liquid dispensing tank 2 and mixed with the cold water introduced through the second water supply valve 23, thereby quickly increasing the water temperature inside the liquid dispensing tank 2.

[0053] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the scope of the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the spirit and scope of protection of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the scope of protection of the embodiments of the present invention.

Claims

1. A constant temperature hot water supply system utilizing waste heat from steam, characterized in that: It comprises a steam source, a cold water source, and at least three heat-insulating storage tanks, wherein the three heat-insulating storage tanks are: a heat storage tank (1), a liquid preparation tank (2), and a liquid discharge tank (3); The heat storage tank (1) is provided with a steam heater (11) inside, a steam regulating valve (13) connected to a steam source and the steam heater (11) outside, and a first water supply valve (12) connected to a cold water source, for inputting and storing cold water and heating the cold water using steam output from the steam source; The liquid distribution tank (2) is provided with a hot water heater (21) inside, and is provided with a hot water circulation pipeline and an external circulation pump (22) connecting the heat storage tank (1) and the hot water heater (21) outside, as well as a second water supply valve (23) connected to a cold water source, for inputting and storing cold water, and heating the cold water by using the hot water output from the heat storage tank (1); The outside of the liquid outlet tank (3) is provided with a third water supply valve (31) connected to the liquid preparation tank (2), and a liquid outlet regulating valve (32) connected to the auxiliary material mixing tank, for inputting and storing hot water flowing out of the liquid preparation tank (2), and outputting constant temperature hot water to the auxiliary material mixing tank.

2. A constant temperature hot water supply system utilizing waste heat of steam according to claim 1, characterized in that: The heat storage tank (1) is provided with a one-way valve (13) connected to a steam source on the outside. The one-way valve (13) is arranged at the bottom of the heat storage tank (1). The steam source is connected to the one-way valve (13), the steam heater (11) and the atmosphere via a four-way valve (14). When the four-way valve (14) is switched, the steam output from the steam source selectively enters one of the one-way valve (13), the steam heater (11) and the atmosphere.

3. A constant temperature hot water supply system utilizing waste heat of steam according to claim 1 or 2, characterized in that: The outside of the liquid distribution tank (2) is provided with a fourth water supply valve (25) connected to the heat storage tank (1); when the fourth water supply valve (25) is opened, hot water in the heat storage tank (1) flows into the inside of the liquid distribution tank (2).

4. A constant temperature hot water supply system utilizing waste heat of steam according to claim 3, characterized in that: A self-circulating pipeline and a self-circulating pump (24) are provided outside the liquid dispensing tank (2), the two ends of the self-circulating pipeline being connected to the top and the bottom of the liquid dispensing tank (2) respectively, and the self-circulating pump (24) is used to drive the hot water inside the liquid dispensing tank (2) to circulate in the self-circulating pipeline and inside the liquid dispensing tank (2).

5. The constant temperature hot water supply system using waste heat from steam according to claim 1, characterized in that: The steam heater (11) adopts a steam coil arranged inside the heat storage tank (1), or a jacket arranged inside the wall of the heat storage tank (1); the hot water heater (21) adopts a steam coil arranged inside the liquid mixing tank (2), or a jacket arranged inside the wall of the liquid mixing tank (2).

6. The constant temperature hot water supply system using waste heat from steam according to claim 1, characterized in that: Temperature sensors and liquid level sensors are installed inside the heat storage tank (1), the liquid distribution tank (2) and the liquid outlet tank (3); a pressure sensor and a temperature sensor are installed on the steam pipeline between the steam source and the steam regulating valve (13); and the temperature sensor, the liquid level sensor, the pressure sensor and the temperature sensor are all connected to a controller.

7. The constant temperature hot water supply system using waste heat from steam according to claim 1, characterized in that: A pressure relief valve is installed on the steam pipeline between the steam source and the steam regulating valve (13), and a safety valve is provided on the top of the heat storage tank (1).

8. A method for supplying constant temperature hot water using waste heat from steam, characterized in that: The constant temperature hot water supply method uses the constant temperature hot water supply system according to claim 1, and the constant temperature hot water supply method includes the following steps: Liquid level control: monitoring the liquid level inside each thermal insulation storage tank, and then controlling the first water supply valve (12), the second water supply valve (23) and the third water supply valve (31) to open, close or adjust the degree of opening and closing, so as to ensure that the liquid level inside each thermal insulation storage tank is maintained within a preset liquid level range; Temperature control: monitoring the water temperature inside the liquid dispensing tank (2), and then turning on, off or adjusting the operating power of the external circulation pump (22) so that the water temperature inside the liquid dispensing tank (2) is maintained within a temperature range greater than a first threshold value and less than a second threshold value; Outputting hot water: when the water temperature inside the liquid mixing tank (2) is greater than a first threshold value and less than a second threshold value, the third water supply valve (31) is opened to allow the hot water inside the liquid mixing tank (2) to enter the liquid outlet tank (3); at the same time, the hot water demand signal emitted by the auxiliary material mixing tank is monitored, and then the opening and closing degree of the liquid outlet regulating valve (32) is opened, closed or adjusted to maintain the flow rate and flow rate of the hot water entering the auxiliary material mixing tank within a preset flow rate and flow rate range.

9. The method for supplying constant temperature hot water using waste heat of steam according to claim 8, characterized in that: The heat storage tank (1) is provided with a one-way valve (13) connected to a steam source on the outside. The one-way valve (13) is arranged at the bottom of the heat storage tank (1). The steam source is connected to the one-way valve (13), the steam heater (11) and the atmosphere via a four-way valve (14). The constant temperature hot water supply method further comprises the following steps: When the water temperature inside the heat storage tank (1) is lower than a third threshold, the four-way valve (14) connects the steam source and the one-way valve (13), allowing steam to directly flow into the heat storage tank (1) to mix with the water; When the water temperature inside the heat storage tank (1) is greater than a third threshold, the four-way valve (14) connects the steam source and the steam heater (11), allowing steam to pass through the steam heater (11) to heat the water inside the heat storage tank (1); When the water temperature inside the heat storage tank (1) is greater than a fourth threshold value, the four-way valve (14) connects the steam source and the atmosphere, so that the steam is directly discharged into the atmosphere.

10. The method for supplying constant temperature hot water using waste heat of steam according to claim 9, characterized in that: The liquid distribution tank (2) is provided with a fourth water supply valve (25) connected to the heat storage tank (1) on the outside. The constant temperature hot water supply method further comprises the following steps: When the water temperature inside the liquid dispensing tank (2) is lower than a first threshold, the connection between the heat storage tank (1) and the liquid dispensing tank (2) is opened, so that the hot water inside the liquid storage tank is directly passed into the interior of the liquid dispensing tank (2).

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