Waste heat recovery system for steam production

Abstract

The utility model discloses a waste heat recovery system for steam production. The waste heat recovery system comprises a purified water tank, a circulating pump, a steam boiler, a plate heat exchanger and a steam distribution cylinder, a water outlet of the purified water tank is communicated with water inlets of the circulating pump and the steam boiler through pipelines, a water outlet of the circulating pump is communicated with a cold medium inlet of the plate heat exchanger through a pipeline, and a cold medium outlet of the plate heat exchanger is communicated with a water inlet of the purified water tank through a pipeline. A liquid outlet of the gas distribution cylinder and a wastewater outlet of the steam boiler are communicated with a thermal medium inlet of the plate heat exchanger through pipelines; and a thermal medium outlet of the plate heat exchanger is communicated with a water inlet of the sewage treatment system. The connecting structure has the advantages that the connecting structure is simple and easy to realize, the fuel consumption of a subsequent steam boiler is reduced, the heat of condensate water and waste water is recovered, and the steam preparation cost of an enterprise is saved; automatic control of heat exchange is achieved, long-term operation of the circulating pump is avoided, and the service life of the circulating pump is prolonged.

Description

Technical field:

[0001] The utility model relates to the technical field of waste heat recovery and utilization, in particular to a waste heat recovery system for producing steam. Background technology:

[0002] The purified water in the purified water tank is heated by a steam boiler to produce steam. The produced steam is separated by gas distribution cylinders and then distributed to subsequent drug production systems that need to use steam. After a certain period of use, the steam boiler will discharge the wastewater generated therein into the sewage treatment system. In addition, when the gas distribution cylinder distributes steam, condensed water will be generated, and the condensed water will also be sent to the sewage treatment system. At that time, the above-mentioned wastewater and condensed water both contain a large amount of heat and are directly sent to the sewage treatment system for wastewater treatment, resulting in heat waste. Utility model content:

[0003] The utility model aims to provide a waste heat recovery system for producing steam which has a simple connection structure and realizes heat recovery.

[0004] The utility model is implemented by the following technical scheme: The purpose of this patent is to provide a waste heat recovery system for producing steam, which includes a purified water tank, a circulating pump, a steam boiler, a plate heat exchanger and a gas cylinder; the water outlet of the purified water tank is connected to the water inlet of the circulating pump and the steam boiler through a pipeline, the water outlet of the circulating pump is connected to the cold medium inlet of the plate heat exchanger through a pipeline, the cold medium outlet of the plate heat exchanger is connected to the water inlet of the purified water tank through a pipeline, the air outlet of the steam boiler is connected to the air inlet of the gas cylinder through a pipeline, the liquid outlet of the gas cylinder and the wastewater outlet of the steam boiler are both connected to the hot medium inlet of the plate heat exchanger through a pipeline, and the hot medium outlet of the plate heat exchanger is connected to the water inlet of the sewage treatment system.

[0005] Furthermore, a liquid level sensor is arranged on the side wall of the gas sub-cylinder, the liquid outlet is opened at the bottom of the gas sub-cylinder, and a solenoid valve is arranged on the pipe at the liquid outlet; a control valve is arranged on the pipe at the wastewater outlet of the steam boiler; the signal output end of the liquid level sensor is connected to the signal input end of the controller through a signal, and the signal output end of the controller is respectively connected to the signal input ends of the circulation pump, the solenoid valve and the control valve through a signal.

[0006] Advantages of the utility model: 1. The connection structure of the utility model is simple and easy to implement. By setting a plate heat exchanger, the condensed water of the cylinder and the waste water discharged from the steam boiler are exchanged with the purified water, thereby preheating the purified water, increasing the temperature of the purified water, reducing the fuel consumption of the subsequent steam boiler, realizing the recovery of the heat of the condensed water and waste water, and saving the cost of preparing steam for the enterprise.

[0007] 2. The utility model realizes automatic control of heat exchange. When the condensed water level is lower than the lower limit and the steam boiler is not discharging wastewater, the controller controls the circulation pump to stop, avoiding long-term operation of the circulation pump and increasing its service life. Description of the drawings:

[0008] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0009] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0010] Purified water tank 1, circulation pump 2, steam boiler 3, plate heat exchanger 4, gas distribution cylinder 5, sewage treatment system 6, liquid level sensor 7, solenoid valve 8, control valve 9, controller 10. Specific implementation method:

[0011] Example: Figure 1 As shown, a waste heat recovery system for producing steam comprises a purified water tank 1, a circulating pump 2, a steam boiler 3, a plate heat exchanger 4 and a gas cylinder 5; the water outlet of the purified water tank 1 is connected with the water inlets of the circulating pump 2 and the steam boiler 3 through pipelines respectively, the water outlet of the circulating pump 2 is connected with the cold medium inlet of the plate heat exchanger 4 through a pipeline, the cold medium outlet of the plate heat exchanger 4 is connected with the water inlet of the purified water tank 1 through a pipeline, the air outlet of the steam boiler 3 is connected with the air inlet of the gas cylinder 5 through a pipeline, the liquid outlet of the gas cylinder 5 and the wastewater outlet of the steam boiler 3 are both connected with the hot medium inlet of the plate heat exchanger 4 through a pipeline, and the hot medium outlet of the plate heat exchanger 4 is connected with the water inlet of the sewage treatment system 6.

[0012] A liquid level sensor 7 is arranged on the side wall of the gas sub-cylinder 5, the liquid outlet is opened at the bottom of the gas sub-cylinder 5, and a solenoid valve 8 is arranged on the pipeline at the liquid outlet; a control valve 9 is arranged on the pipeline at the waste water outlet of the steam boiler 3; the signal output end of the liquid level sensor 7 is connected to the signal input end of the controller 10 through a signal, and the signal output end of the controller 10 is respectively connected to the signal input ends of the circulation pump 2, the solenoid valve 8 and the control valve 9 through a signal.

[0013] Working principle:

[0014] The liquid level sensor 7 constantly detects the condensed water level in the cylinder 5 and transmits the signal to the controller 10. When the liquid level is higher than the upper limit, the circulation pump 2 is started first, and the solenoid valve 8 is controlled to open after a delay of 5 seconds. The condensed water exchanges heat with the purified water in the plate heat exchanger 4. After the heat exchange, the purified water returns to the purified water tank 1, and the condensed water is sent to the subsequent sewage treatment system 6 for treatment as waste water.

[0015] When the steam boiler 3 needs to discharge wastewater, the controller 10 controls the circulation pump 2 to start first, delays 5s to control the control valve 9 to open, and the wastewater exchanges heat with purified water in the plate heat exchanger 4. After the heat exchange, the purified water returns to the purified water tank 1, and the wastewater is sent to the subsequent sewage treatment system 6 for wastewater treatment.

[0016] When the liquid level sensor 7 detects that the condensed water level in the gas cylinder 5 is lower than the lower limit value, the controller 10 controls the solenoid valve 8 to close; when the steam boiler 3 does not need to discharge waste water, the controller 10 controls the control valve 9 to close; when the solenoid valve 8 and the control valve 9 are both in the closed state, the controller 10 controls the circulation pump 2 to stop, so as to avoid the long-term operation of the circulation pump 2 and increase its service life.

[0017] The utility model has a simple connection structure, which is easy to implement and realizes automatic control of heat exchange. By setting a plate heat exchanger 4, the condensed water of the cylinder 5 and the waste water discharged from the steam boiler 3 are exchanged with the purified water, and then the purified water is preheated, the temperature of the purified water is increased, the fuel consumption of the subsequent steam boiler 3 is reduced, the heat recovery of the condensed water and the waste water is realized, and the cost of preparing steam for the enterprise is saved.

[0018] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A waste heat recovery system for producing steam, characterized in that: It includes a purified water tank, a circulating pump, a steam boiler, a plate heat exchanger and a gas cylinder; the water outlet of the purified water tank is communicated with the water inlet of the circulating pump and the steam boiler through pipelines respectively, the water outlet of the circulating pump is communicated with the cold medium inlet of the plate heat exchanger through a pipeline, the cold medium outlet of the plate heat exchanger is communicated with the water inlet of the purified water tank through a pipeline, the air outlet of the steam boiler is communicated with the air inlet of the gas cylinder through a pipeline, the liquid outlet of the gas cylinder and the wastewater outlet of the steam boiler are both communicated with the hot medium inlet of the plate heat exchanger through a pipeline, and the hot medium outlet of the plate heat exchanger is communicated with the water inlet of a sewage treatment system.

2. A waste heat recovery system for producing steam according to claim 1, characterized in that: A liquid level sensor is arranged on the side wall of the gas sub-cylinder, the liquid outlet is opened at the bottom of the gas sub-cylinder, and a solenoid valve is arranged on the pipe at the liquid outlet; a control valve is arranged on the pipe at the waste water outlet of the steam boiler; the signal output end of the liquid level sensor is connected to the signal input end of the controller through a signal, and the signal output end of the controller is respectively connected to the signal input ends of the circulation pump, the solenoid valve and the control valve through a signal.

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