Dead steam recovery device

Abstract

The utility model provides a dead steam recovery device, and belongs to the field of dead steam recovery devices. Comprising an injection device, a heat exchanger, a gas-liquid separator and a deaerator, a water inlet of the heat exchanger is connected with a water outlet of the spraying device, a water outlet of the heat exchanger is connected with a water inlet of the gas-liquid separator, and a water outlet of the gas-liquid separator is connected with a water inlet of the deaerator; a steam outlet of the deaerator is connected with a steam inlet of the injection device through a steam outlet pipeline, and a water outlet of the deaerator is connected with a deoxygenated and desalted water storage tank. According to the utility model, waste of working water can be avoided, and the purposes of energy conservation and emission reduction are achieved; the device is relatively simple in structure, few in quick-wear parts and capable of stably running for a long time; the cost is low, and the investment payback period is short.

Description

Technical Field

[0001] The utility model relates to the field of waste steam recovery devices, and particularly relates to a waste steam recovery device. Background Art

[0002] In the chemical and power industries, boiler by-product steam is mostly used, so there are high requirements for the water quality of by-product steam. In particular, an oxygen deaerator is needed to remove the dissolved oxygen in demineralized water. Most of the deaeration facilities use thermal deaerators. Thermal deaerators are widely used because of their stable deaeration effect. However, steam is discharged during the exhaust gas process of thermal deaerators, and most of them cannot be recovered due to cost and technology, resulting in waste of heat energy and water resources. The wasted steam can be called waste steam, and the calorific value of waste steam is very close to that of new steam, with high heat value. If this part of waste steam can be recovered and utilized, it will bring huge economic benefits and good social benefits.

[0003] Recover the non-polluted low-temperature steam discharged during the exhaust gas process of the deaerator and jacket, send it back to the feed water system, or mix it with demineralized water to increase the temperature of the make-up water, and then send the heated demineralized water to the deaerator to make full use of the heat, reduce the usage of high-quality steam, achieve considerable gas-saving benefits for the company, play a positive role in reducing gas consumption, and achieve the purpose of energy conservation, environmental protection, no emission and no pollution. Content of the Utility Model

[0004] In view of the problems existing in the above-mentioned prior art, the utility model provides a waste steam recovery device. The technical problem to be solved by the utility model is to provide a device with relatively simple structure, few vulnerable parts, capable of long-term stable operation, relatively low cost, short investment recovery period, and capable of achieving the purpose of energy conservation and emission reduction.

[0005] To solve the above technical problems, the utility model provides a waste steam recovery device, which includes a jet device, a heat exchanger, a gas-liquid separator and a deaerator; the water inlet of the heat exchanger is connected to the water outlet of the jet device, the water outlet of the heat exchanger is connected to the water inlet of the gas-liquid separator, and the water outlet of the gas-liquid separator is connected to the water inlet of the deaerator; the steam outlet of the deaerator is connected to the steam inlet of the jet device through a steam outlet pipe, and a deaerated demineralized water storage tank is connected to the drain outlet of the deaerator.

[0006] Further, between the water inlet and the water outlet of the jet device, an inhalation chamber, a mixing device and a diffuser are sequentially connected in communication. The inhalation chamber is arranged close to the water inlet of the jet device, and the diffuser is arranged close to the water outlet of the jet device.

[0007] Further, a steam inlet is arranged at the top of the inhalation chamber.

[0008] Further, the mixing device includes a tapered chamber and a mixing chamber connected in sequence. The tapered chamber is fixedly connected to the right end of the suction chamber, and the right end of the mixing chamber is fixedly connected to the inlet of the diffuser.

[0009] Further, the injection device further includes a nozzle disposed in the suction chamber, and the outlet of the nozzle is in communication with the mixing device.

[0010] Further, the nozzle is of a conical structure.

[0011] Further, the tapered chamber is of a conical structure in the same direction as the nozzle.

[0012] Further, an exhaust port is provided at the top of the gas-liquid separator, and a screen is provided inside the gas-liquid separator.

[0013] Further, the water outlet of the gas-liquid separator is connected to a booster water pump, and the water outlet of the booster water pump is connected to the deaerator.

[0014] Further, a waste steam recovery control valve and a waste steam vent control valve are arranged in parallel on the steam outlet pipe; the waste steam recovery control valve is arranged between the steam outlet of the deaerator and the steam inlet of the injection device.

[0015] The beneficial effects obtained by the waste steam recovery device of the present utility model are as follows:

[0016] Using desalted water as the power medium, after absorbing waste steam through the injection device, the desalted water is then recycled to the desalted water user by the booster water pump or sent back to the deaerator for reuse, avoiding waste of desalted water and achieving the purpose of energy conservation and emission reduction;

[0017] After the desalted water is heated to 70 - 90 °C by the waste steam in the injection device, it is then used to heat other substances, enabling the recovery and utilization of heat energy;

[0018] The device of the present utility model has a relatively simple structure, few vulnerable parts, and can operate stably for a long time; the cost is relatively low, and the investment payback period is short. Description of the Drawings

[0019] Figure 1 is a schematic structural diagram of the waste steam recovery device of an embodiment of the present utility model;

[0020] Figure 2 is a schematic structural diagram of the injection device of an embodiment of the present utility model;

[0021] Figure 3 is Figure 2 the enlarged view at I in

[0022] Reference numerals: 1, deaerated and desalted water storage tank; 2, deaerator; 3, exhaust steam vent control valve; 4, exhaust steam recovery control valve; 5, injection device; 5-1, injection device water inlet; 5-2, nozzle; 5-3, steam inlet; 5-4, suction chamber; 5-5, convergent chamber; 5-6 mixing chamber; 5-7, diffuser; 5-8, injection device water outlet; 6, heat exchanger; 7, gas-liquid separator; 7-1, screen; 7-2, exhaust port; 8, boost water pump. Detailed implementation mode

[0023] To make the purpose, technical solution and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0024] Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the present utility model to be protected, but merely represents the selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0025] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0026] In the present utility model, unless otherwise clearly defined and limited, the terms "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0027] To better understand the purpose, structure and function of the present utility model, the following further details a waste steam recovery device of the present utility model with reference to the accompanying drawings.

[0028] Example 1:

[0029] As Figure 1As shown in the figure, a waste steam recovery device of the present utility model includes an injection device 5, a heat exchanger 6, a gas-liquid separator 7, and a deaerator 2; the water inlet of the heat exchanger 6 is connected to the water outlet 5-8 of the injection device, the water outlet of the heat exchanger 6 is connected to the water inlet of the gas-liquid separator 7, and the water outlet of the gas-liquid separator 7 is connected to the water inlet of the deaerator 2; the steam outlet of the deaerator 2 is connected to the steam inlet of the injection device 5 through a steam pipeline, and the drain outlet of the deaerator 5 is connected to a deaerated desalted water storage tank 1.

[0030] Embodiment 2:

[0031] As Figure 1 shown in the figure, a waste steam recovery device of the present utility model includes an injection device 5, a heat exchanger 6, a gas-liquid separator 7, and a deaerator 2; the water inlet of the heat exchanger 6 is connected to the water outlet 5-8 of the injection device, the water outlet of the heat exchanger 6 is connected to the water inlet of the gas-liquid separator 7, and the water outlet of the gas-liquid separator 7 is connected to the water inlet of the deaerator 2; the steam outlet of the deaerator 2 is connected to the steam inlet 5-3 of the injection device 5 through a steam pipeline, and the drain outlet of the deaerator 5 is connected to a deaerated desalted water storage tank 1.

[0032] The difference between this embodiment and Embodiment 1 is:

[0033] As Figures 1 to 3 shown in the figure, between the water inlet 5-1 and the water outlet 5-8 of the injection device, a suction chamber 5-4, a mixing device, and a diffuser 5-7 are sequentially connected in communication. The suction chamber 5-4 is arranged close to the water inlet 5-1 of the injection device, and the diffuser 5-7 is arranged close to the water outlet 5-8 of the injection device;

[0034] The injection device 5 further includes a nozzle 5-2. The nozzle 5-2 is of a conical structure. Since the cross-sectional area of the cone becomes smaller and the liquid flow rate is accelerated, the nozzle 5-2 is also the power source of the injection device 5; the nozzle is arranged in the suction chamber 5-4, and the outlet of the nozzle 5-2 is connected to the mixing device in communication; the mixing device includes a gradually reducing chamber 5-5 and a mixing chamber 5-6 connected in sequence. The gradually reducing chamber 5-5 is fixedly connected to the right end of the suction chamber 5-4, and the right end of the mixing chamber 5-6 is connected to the inlet of the diffuser 5-7; a steam inlet 5-3 is arranged at the top of the suction chamber; the gradually reducing chamber 5-5 is of a conical structure in the same direction as the nozzle 5-2, and spiral rifling is arranged along the inner wall of the gradually reducing chamber 5-5;

[0035] Using low-temperature demineralized water (25°C) as the working water, the working water body passes through the area between the outlet of the nozzle 5-2 and the inlet of the diffuser 5-6. Due to the high speed of the working water flow, a negative pressure zone appears, sucking the exhausted steam into the suction chamber 5-4 through the steam inlet 5-3. After the working water body is sprayed and atomized at high speed by the nozzle 5-2 to reduce vibration, it mixes with the sucked exhausted steam in the mixing device and exchanges energy. In this special pipeline, the first absorption is formed by using negative pressure in the suction chamber 5-4. Then, in the tapered chamber 5-5, under the action of the spiral rifling, water and the exhausted steam can be fully mixed in a spiral manner and then sent out together. That is, a disk-shaped second absorption is formed between the suction chamber 5-4 and the tapered chamber 5-5. Then, in the mixing chamber 5-6, the third absorption is formed by a special mechanical grinding group, and the sucked exhausted steam is completely condensed into water in the mixing chamber.

[0036] Embodiment 3:

[0037] As Figure 1 shown, a device for recovering exhausted steam of the present utility model includes a spraying device 5, a heat exchanger 6, a gas-liquid separator 7, and a deaerator 2; the water inlet of the heat exchanger 6 is connected to the water outlet of the spraying device 5-8, the water outlet of the heat exchanger 6 is connected to the water inlet of the gas-liquid separator 7, and the water outlet of the gas-liquid separator 7 is connected to the water inlet of the deaerator 2; the steam outlet of the deaerator 2 is connected to the steam inlet 5-3 of the spraying device 5 through a steam outlet pipe, and the drain outlet of the deaerator 5 is connected with a deaerated demineralized water storage tank 1.

[0038] The difference between this embodiment and the above embodiments is:

[0039] As Figure 1 shown, an exhaust port 7-2 is provided at the top of the gas-liquid separator 7, and a screen 7-1 is provided inside the gas-liquid separator; the water outlet of the gas-liquid separator 7 is connected with a booster water pump 8, and the water outlet of the booster water pump 8 is connected to the deaerator 2, or the water outlet of the booster water pump 8 is connected to the demineralized water user; after the demineralized water is condensed to 20-30°C by the cooling medium in the heat exchanger 6, it enters the gas-liquid separator 7 by gravity and is sprayed onto the screen 7-1. After a series of processes such as buffering, breaking, and oxygen removal on the screen, non-condensable gases such as oxygen are removed, and the separated gas is discharged through the top exhaust port 7-2. The mixed water is sent to the deaerator 2 for reuse through the booster water pump 8 under the control of the separation tank liquid level, or is sent to the demineralized water user by the booster water pump 8, thereby achieving the purpose of energy conservation and emission reduction;

[0040] A waste steam recovery control valve 4 and a waste steam vent control valve 3 are arranged in parallel on the steam outlet pipe; the waste steam recovery control valve 4 is arranged between the steam outlet of the deaerator 2 and the steam inlet of the spraying device 5; when the waste steam is diverted from venting to recovery, the waste steam recovery control valve 4 needs to be fully opened, and then the waste steam vent control valve 3 is slowly opened.

[0041] The utility model provides a waste steam recovery device, and its working principle is as follows:

[0042] As Figure 1 and Figure 3 shown, taking low-temperature desalted water (25°C) as the working water, the working water is input from the injection device 5, and the waste steam is drawn into the injection device 5 from the steam inlet 5-3. Through the action of the injection device 5, the waste steam is condensed into water and becomes a gas-water mixture. After the low-temperature desalted water is heated to 70-90°C and enters the heat exchanger 6 to recover heat, the desalted water is condensed to 20-30°C, and then enters the gas-liquid separator 7 by gravity. The desalted water is sprayed onto the screen 7-1, and after a series of processes such as buffering, breaking, and oxygen removal on the screen 7-1, non-condensable gases such as oxygen are removed. The separated gas is discharged through the top exhaust port 7-2, and the gas-water mixture is sent to the deaerator 2 for reuse through the booster water pump 8 by controlling the liquid level of the separation tank.

[0043] The utility model can also introduce the waste steam into a large-scale circulating water cooler for cooling. Using the principle that the volume of steam becomes smaller during cooling, a micro-negative pressure is formed, and the waste steam is continuously introduced into the cooler, and the condensed water is recycled.

[0044] The parts not described in detail in the utility model are prior arts, and their internal structures will not be described in detail here one by one.

[0045] Although various embodiments of the utility model have been described in detail herein, it should be understood that the utility model is not limited to the specific embodiments described and shown in detail here. Other variations and modifications can be implemented by those skilled in the art without departing from the essence and scope of the utility model. All such variations and modifications fall within the scope of the utility model. Moreover, all components described herein can be replaced by other technically equivalent components.

Claims

1. A waste steam recovery device, characterized in that, It includes a spraying device, a heat exchanger, a gas-liquid separator and a deaerator; the water inlet of the heat exchanger is connected to the water outlet of the spraying device, the water outlet of the heat exchanger is connected to the water inlet of the gas-liquid separator, and the water outlet of the gas-liquid separator is connected to the water inlet of the deaerator; the steam outlet of the deaerator is connected to the steam inlet of the spraying device through a steam outlet pipe, and the drain outlet of the deaerator is connected to a deaerated desalted water storage tank.

2. The waste steam recovery device according to claim 1, wherein Between the water inlet and the water outlet of the spraying device, a suction chamber, a mixing device and a diffuser are successively connected in communication. The suction chamber is arranged close to the water inlet of the spraying device, and the diffuser is arranged close to the water outlet of the spraying device.

3. The exhaust steam recovery device according to claim 2, wherein, The top of the suction chamber is provided with a steam inlet.

4. The waste steam recovery device according to claim 2, wherein, The mixing device includes a gradually reducing chamber and a mixing chamber connected in sequence. The gradually reducing chamber is fixedly connected to the right end of the suction chamber, and the right end of the mixing chamber is fixedly connected to the inlet of the diffuser.

5. The exhaust steam recovery device according to claim 4, characterized in that, The spraying device further includes a nozzle, the nozzle is arranged in the suction chamber, and the outlet of the nozzle is connected to the mixing device in communication.

6. The waste steam recovery device according to claim 5, characterized in that, The nozzle is of a conical structure.

7. The waste steam recovery device according to claim 6, characterized in that The gradually reducing chamber is of a conical structure in the same direction as the nozzle.

8. The exhausted steam recovery device according to claim 1, characterized in that, The top of the gas-liquid separator is provided with an exhaust port, and a screen is arranged inside the gas-liquid separator.

9. The waste steam recovery device according to claim 1, wherein, The water outlet of the gas-liquid separator is connected to a booster water pump, and the water outlet of the booster water pump is connected to the deaerator.

10. The waste steam recovery device according to claim 1, characterized in that, A waste steam recovery control valve and a waste steam vent control valve are arranged in parallel on the steam outlet pipe; the waste steam recovery control valve is arranged between the steam outlet of the deaerator and the steam inlet of the spraying device.

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