Mixed heat supply device suitable for low-temperature flash evaporation system

Abstract

The invention relates to the field of heat supply, in particular to a mixed heat supply device suitable for a low-temperature flash evaporation system. Comprising a heating medium water unit and a steam outlet pipe, the heating medium water unit comprises a heating medium water heat exchanger, the liquid inlet end of the heating medium water heat exchanger is communicated with a heating medium water liquid inlet pipe, the auxiliary steam unit comprises an auxiliary steam heat exchanger and an auxiliary steam inlet pipe, the auxiliary steam heat exchanger is provided with a heat source inlet, and the auxiliary steam inlet pipe is communicated with the heat source inlet; the heating medium water heat exchanger and the auxiliary steam heat exchanger are each provided with a steam outlet, the two steam outlets communicate with a steam outlet pipe, and the steam outlet pipe communicates with a vacuum pump. According to the mixed heat supply device suitable for the low-temperature flash evaporation system, the problem that water vapor and auxiliary vapor generated by low-temperature flash evaporation cannot be used at the same time can be solved.

Description

Technical Field

[0001] The invention relates to the field of heating, and in particular to a mixed heating device adapted to a low-temperature flash evaporation system. Background Art

[0002] Low-temperature flash evaporation is a technology that uses pressure and temperature changes to quickly evaporate water to obtain water vapor at a certain temperature. It is widely used in the fields of chemical industry, environmental protection, energy recovery, etc. When performing low-temperature flash evaporation, it is necessary to reduce the air pressure in the entire system to reduce the boiling point of water. Therefore, only a relatively lower temperature is needed to boil water and produce water vapor. For some factories with recoverable waste heat, the use of recycled waste heat can further save energy. When recovering waste heat, it is necessary to first heat water with waste heat to form heat medium water, and then use the heat medium water as a heat source to generate steam using low-temperature flash evaporation technology. However, the generation of water vapor depends on waste heat. When the amount of water vapor required is more than the water vapor that can be generated by the waste heat, it will cause a problem of insufficient water vapor. At this time, additional auxiliary steam is needed to supplement it. However, the water vapor obtained by low-temperature flash evaporation is in a negative pressure state. After the auxiliary steam is cooled and reduced in pressure, its pressure is still greater than that of the water vapor obtained by low-temperature flash evaporation. If the auxiliary steam and water vapor are led to the use location through the same pipeline, the pressure difference between the auxiliary steam and the water vapor will cause the equipment at the use location to draw away the auxiliary steam first and fail to use the water vapor generated by the low-temperature flash evaporation. Therefore, the current auxiliary steam and water vapor generated by the low-temperature flash evaporation are respectively transported to the use location by two systems, which will undoubtedly make the structure of the entire device complicated.

[0003] Secondly, based on the above reasons, only auxiliary steam or water vapor generated by low-temperature flash evaporation can be used at the same time. If water vapor generated by low-temperature flash evaporation is used as the main source, auxiliary steam needs to be promptly replaced when water vapor is insufficient. When new water vapor is generated by low-temperature flash evaporation, it needs to be switched back to the water vapor side, which requires frequent adjustments and complicated operations. If auxiliary steam is used as the main source, the water vapor generated by low-temperature flash evaporation will not be fully utilized, resulting in a large amount of energy waste. In addition, the cost of using auxiliary steam is several times more than the cost of low-temperature flash evaporation with heat medium water heat exchange. Using auxiliary steam as the main source will result in higher overall costs. Summary of the invention

[0004] The present invention is intended to provide a mixed heating device adapted to a low-temperature flash evaporation system to solve the problem that water vapor and auxiliary steam generated by low-temperature flash evaporation cannot be used at the same time.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a hybrid heating device adapted to a low-temperature flash evaporation system, comprising a heat medium water unit and a steam outlet pipe, the heat medium water unit comprising a heat medium water heat exchanger, the liquid inlet end of the heat medium water heat exchanger being connected with a heat medium water liquid inlet pipe, and an auxiliary steam unit being further provided, the auxiliary steam unit comprising an auxiliary steam heat exchanger and an auxiliary steam inlet pipe, the auxiliary steam heat exchanger being provided with a heat source inlet, and the auxiliary steam inlet pipe being connected with the heat source inlet; the heat medium water heat exchanger and the auxiliary steam heat exchanger are both provided with steam outlets, both steam outlets are connected with the steam outlet pipe, and the steam outlet pipe is connected with a vacuum pump.

[0006] The beneficial effects of this program are:

[0007] 1. The auxiliary steam unit in this scheme uses the auxiliary steam as a heat source through the auxiliary steam heat exchanger to heat water to generate water vapor. Since the steam outlet pipe is connected to the vacuum pump, the auxiliary steam heat exchanger is also in a negative pressure state like the heat medium water heat exchanger, that is, the auxiliary steam heat exchanger in this scheme also uses low-temperature flash evaporation to generate water vapor. Therefore, the pressure of the water vapor generated in the auxiliary steam heat exchanger and the heat medium water heat exchanger is the same, and the two can work at the same time. In actual application, the amount of water vapor generated by the auxiliary steam heat exchanger can be adjusted according to the amount of water vapor generated by the heat medium water, so that when the water vapor generated by the heat medium water is insufficient, the water vapor generated by the auxiliary steam can be used as a supplement, which can fully ensure the full utilization of the heat medium water energy and avoid frequent opening and closing of the heat medium water unit.

[0008] 2. The auxiliary steam in this scheme no longer directly acts on the position that needs to be heated in the production process. Instead, the auxiliary steam is used to heat and generate water vapor, and the generated water vapor is applied to the position that needs to be heated. In the auxiliary steam heat exchanger, even if high-temperature and high-pressure auxiliary steam is directly used, water vapor can be normally generated. Therefore, there is no need to set up a cooling and pressure reduction device, which effectively reduces the cost of the device.

[0009] 3. Because the pressure of the water vapor generated in the auxiliary steam heat exchanger and the heat medium water heat exchanger is the same, the water vapor generated in the auxiliary steam heat exchanger and the heat medium water heat exchanger can be transported to the use location using the same pipeline, which makes the pipeline design simpler and the cost lower.

[0010] Furthermore, at least two auxiliary steam units and steam outlet pipes are provided, and each auxiliary steam unit is connected with a steam outlet pipe.

[0011] The beneficial effects of this solution are: multiple auxiliary steam units work simultaneously to generate more water vapor, and when the difference between the water vapor generated by the heat medium water and the required water vapor is large, the water vapor generated by the auxiliary steam is guaranteed to be sufficient. And when water vapor is needed in multiple places, multiple auxiliary steam units provide water vapor for multiple places where water vapor is needed, so that the amount of water vapor generated by the auxiliary steam heat exchanger can be adjusted separately according to the amount of water vapor required at each place.

[0012] Furthermore, each steam outlet pipe is connected to at least two auxiliary steam units.

[0013] The beneficial effect of this solution is that when a certain place needs more water vapor, or the auxiliary steam heat exchanger connected to the place fails and cannot generate water vapor, this solution can provide water vapor to the place through another auxiliary steam unit connected to the steam outlet pipe to ensure the normal operation of the factory.

[0014] Furthermore, the number of the heat medium water units is the same as the number of the auxiliary steam units, and each steam outlet pipe is connected to at least one heat medium water unit and at least one auxiliary steam unit.

[0015] The beneficial effect of this solution is that when the water vapor generated by the heat medium water unit is insufficient, this solution ensures that each heat medium water unit is provided with at least one auxiliary steam unit to provide water vapor.

[0016] Furthermore, the steam outlet pipe is connected to a condenser.

[0017] The beneficial effect of this solution is: ensuring that the low-temperature steam that has done work is condensed into liquid water through the condenser, which is convenient for internal circulation and continuous use.

[0018] Furthermore, the condenser is provided with a condensate outlet, the condensate outlet is connected to a condensate tank, the condensate tank is provided with an air outlet, and the vacuum pump is connected to the air outlet.

[0019] The beneficial effects of this solution are: the condensed water tank can collect condensed water for convenient unified utilization, and the condensed water tank is located between the vacuum pump and the steam outlet pipe to prevent the vacuum pump from malfunctioning due to water ingress.

[0020] Furthermore, the condensate water tank is provided with a liquid outlet, the auxiliary steam heat exchanger is provided with a clean water inlet connected to the steam outlet, and the liquid outlet is connected to the clean water inlet.

[0021] The beneficial effects of this solution are as follows: the water collected in the condensate tank is condensed water obtained by condensing water vapor, and the water does not contain various ions and the like that are easy to produce scale. The condensed water is re-introduced into the auxiliary steam heat exchanger to be heated to produce water vapor, which can avoid the formation of scale in the auxiliary heat exchanger, and there is no need to clean the scale, which is more convenient to use.

[0022] Furthermore, a condensate pump is provided between the liquid outlet and the clean water inlet.

[0023] The beneficial effect of this solution is that the condensate pump can provide the pressure to pass the condensate into the auxiliary steam heat exchanger and the heat medium water heat exchanger.

[0024] Furthermore, the condensation water tank is connected to a clean water tank.

[0025] The beneficial effect of this solution is that when there is too much water collected in the condensation water tank, the water can be introduced into the clean water tank for storage.

[0026] Furthermore, the heat medium water heat exchanger is provided with a heat medium water outlet, the heat medium water outlet is connected to a booster pump, and the booster pump is connected to the original heat medium water system.

[0027] The beneficial effects of this scheme are as follows: the original heat medium water system in this scheme refers to the existing system in the factory for heating heat medium water. The booster pump in this scheme can send the water in the heat medium water heat exchanger into the original heat medium water system of the factory, and use the original heat medium water system to heat the heat medium water again, thereby reusing the heat medium water. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a system diagram of an auxiliary steam unit in an embodiment of the present invention;

[0029] Figure 2 4 is a system diagram of a heat medium water unit in an embodiment of the present invention. DETAILED DESCRIPTION

[0030] The following is further described in detail through specific implementation methods:

[0031] The reference numerals in the drawings of the specification include: auxiliary steam heat exchanger 1, connecting pipe 11, steam outlet pipe 21, heater 2, condenser 3, condensate tank 4, vapor-liquid separator 41, vacuum pump 42, condensate pump 5, heat medium water heat exchanger 6, booster pump 7.

[0032] Example

[0033] The embodiment is basically as follows Figure 1 and Figure 2 As shown, a hybrid heating device adapted to a low-temperature flash evaporation system includes a condensing water tank 4, a clean water tank, two heat medium water units, two steam outlet pipes 21, two auxiliary steam units and two condensers 3. The auxiliary steam unit includes an auxiliary steam heat exchanger 1 and an auxiliary steam inlet pipe. The auxiliary steam heat exchanger 1 adopts an existing heat exchanger, and the structure of the heat exchanger is not repeated in this embodiment. The auxiliary steam heat exchanger 1 is provided with a heat source inlet, a liquid water outlet, a steam outlet, a clean water inlet and a clean water outlet. The auxiliary steam inlet pipe is connected to the heat source inlet to pass the auxiliary steam into the auxiliary steam heat exchanger 1. The liquid water outlet is connected to the clean water tank to guide the liquid water formed by condensation after the heat exchange is completed into the clean water tank for storage.

[0034] The steam outlets of the two auxiliary steam heat exchangers 1 are respectively connected to the two steam outlet pipes 21, and a connecting pipe 11 is provided between the two steam outlets. The steam outlets of the two auxiliary steam heat exchangers 1 pass through the connecting pipe 11, and a valve is provided on the connecting pipe 11. Through the connecting pipe 11, each steam outlet pipe can be connected to the two auxiliary steam heat exchangers 1.

[0035] In this embodiment, there are two places where water vapor is needed, both of which are heaters 2, and two steam outlet pipes 21 are connected to the two heaters 2 respectively. The two heaters 2 are connected to the two condensers 3 respectively. The condensers 3 in this embodiment also adopt the existing technology. The two condensers 3 are provided with condensed water outlets, and the two condensed water outlets are connected to the condensed water tank 4. The condensed water tank 4 is provided with an air outlet, and the air outlet is connected to the vapor-liquid separator 41 and the vacuum pump 42 in sequence. The vacuum pump 42 forms a negative pressure in the condensed water tank 4, the condenser 3, and the steam outlet pipe 21, so that a negative pressure is formed in the auxiliary steam heat exchanger 1 to achieve low-temperature flash evaporation. The condensed water tank 4 is also connected to the clean water tank, and a valve is also provided between the condensed water tank 4 and the clean water tank. By opening the valve, the excess condensed water in the condensed water tank 4 can enter the clean water tank and be collected.

[0036] The heat medium water unit includes a heat medium water heat exchanger 6. The heat medium water heat exchanger 6 in this embodiment has the same structure as the auxiliary steam heat exchanger 1. The heat medium water heat exchanger 6 is provided with a heat medium water inlet, a heat medium water outlet, a clean water inlet and a steam outlet. The heat medium water inlet is connected to a heat medium water inlet pipe to pass the heat medium water into the heat medium water heat exchanger 6. The heat medium water outlet is connected to a booster pump 7, which quickly guides the heat medium water in the heat medium water heat exchanger 6 to the original heat medium water system through the booster pump 7, so as to heat the heat medium water again and reuse it. The steam outlets on the two heat medium water heat exchangers 6 are respectively connected to the two steam outlet pipes 21 to provide water vapor to the two heaters 2 respectively.

[0037] A liquid outlet is provided on the condensed water tank 4. The liquid outlet in this embodiment is connected to the clean water inlets on the two heat medium water heat exchangers 6 and the two auxiliary heat exchangers, and a condensate pump 5 is provided between the liquid outlet and each clean water inlet, which is used to replenish the clean water in the heat exchanger after the clean water in the heat medium water heat exchanger 6 and the auxiliary heat exchanger is heated and evaporated to form water vapor and discharged from the steam outlet pipe 21. Since the replenished clean water is obtained by condensing water vapor, no scale will be formed in the heat exchanger.

[0038] The specific implementation process is as follows:

[0039] Initially, the water vapor generated by the two heat medium water heat exchangers 6 is used to provide water vapor for the two heaters 2 respectively, and the vacuum pump 42 works to make the water vapor generated by the heat medium water heat exchanger 6 enter the two heaters 2 respectively through the two steam outlet pipes 21. The water vapor is condensed into liquid condensed water after being heated in the heater 2, and the remaining water vapor enters the condenser 3 and is completely condensed into liquid condensed water, and the condensed water enters the condensed water tank 4 to be collected.

[0040] When the clean water in the heat medium water heat exchanger 6 for being heated to form water vapor is insufficient, the condensed water in the condensed water tank 4 is passed into the heat medium water heat exchanger 6 through the condensed water pump 5 to supplement the clean water.

[0041] When the water vapor generated by the heat medium water is insufficient, auxiliary steam is introduced into the auxiliary steam heat exchanger 1, and the auxiliary steam is used as a heat source to form water vapor in the auxiliary steam heat exchanger 1. The water vapor formed in the two auxiliary steam heat exchangers 1 enters the two heaters 2 through the two steam outlet pipes 21 respectively, and is used simultaneously with the water vapor generated by the heat medium water heat exchanger 6.

[0042] When a certain auxiliary steam heat exchanger 1 fails, the valve on the connecting pipe 11 is opened, and water vapor is provided to the heater 2 connected to the failed auxiliary steam heat exchanger 1 through another auxiliary steam heat exchanger 1 .

[0043] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A hybrid heating device adapted to a low-temperature flash evaporation system, comprising a heat medium water unit and a steam outlet pipe, wherein the heat medium water unit comprises a heat medium water heat exchanger, and the liquid inlet end of the heat medium water heat exchanger is connected to a heat medium water liquid inlet pipe, characterized in that: An auxiliary steam unit is also provided, which includes an auxiliary steam heat exchanger and an auxiliary steam inlet pipe. The auxiliary steam heat exchanger is provided with a heat source inlet, and the auxiliary steam inlet pipe is connected to the heat source inlet; the heat medium water heat exchanger and the auxiliary steam heat exchanger are both provided with steam outlets, and the two steam outlets are both connected to the steam outlet pipe, and the steam outlet pipe is connected to a vacuum pump.

2. A hybrid heating device adapted to a low-temperature flash evaporation system according to claim 1, characterized in that: There are at least two auxiliary steam units and steam outlet pipes, and each auxiliary steam unit is connected with a steam outlet pipe.

3. A hybrid heating device adapted to a low-temperature flash evaporation system according to claim 2, characterized in that: Each steam outlet pipe is connected to at least two auxiliary steam units.

4. A hybrid heating device adapted to a low-temperature flash evaporation system according to claim 2, characterized in that: The number of the heat medium water units is the same as the number of the auxiliary steam units, and each steam outlet pipe is connected to at least one heat medium water unit and at least one auxiliary steam unit.

5. The hybrid heat supply device adapted to the low-temperature flash evaporation system according to claim 1, characterized in that: The steam outlet pipe is connected to a condenser.

6. A hybrid heat supply device adapted to a low-temperature flash evaporation system according to claim 5, characterized in that: The condenser is provided with a condensate outlet, the condensate outlet is connected with a condensate tank, the condensate tank is provided with an air outlet, and the vacuum pump is connected with the air outlet.

7. A hybrid heat supply device adapted to a low-temperature flash evaporation system according to claim 6, characterized in that: The condensate water tank is provided with a liquid outlet, the auxiliary steam heat exchanger is provided with a clean water inlet communicated with the steam outlet, and the liquid outlet is communicated with the clean water inlet.

8. The hybrid heat supply device adapted to the low-temperature flash evaporation system according to claim 6, characterized in that: A condensate pump is provided between the liquid outlet and the clean water inlet.

9. A hybrid heat supply device adapted to a low-temperature flash evaporation system according to any one of claims 6 to 8, characterized in that: The condensation water tank is connected to the clean water tank.

10. The hybrid heat supply device adapted to the low-temperature flash evaporation system according to claim 1, characterized in that: The heat medium water heat exchanger is provided with a heat medium water outlet, and the heat medium water outlet is connected with a booster pump, and the booster pump is connected with the original heat medium water system.

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